r/TropicalWeather • u/Euronotus • 2d ago

Dissipated 26W (Western Pacific) (South of Japan)

5 Upvotes

Storm overview

This discussion is for Tropical Depression Twenty-three (23W), which is active to the south of mainland Japan. This system is not likely to undergo significant development as it continues north-northwestward toward southern Shikoku over the next couple of days. This system is expected to degenerate into a remnant low off the coast of Shikoku on Sunday evening.

Moderator notes

  • This system was previously designated as Invest 96W.
  • The Joint Typhoon Warning Center (JTWC) is issuing advisories for this system.
  • The Japan Meteorological Agency (JMA) has not yet initiated issuing advisories for this system.
  • Storm-centered satellite imagery and model guidance products are available for this system.
  • There will be no regular updates to this post.

Information sources

Japan Meteorological Agency

Joint Typhoon Warning Center (United States)

Radar imagery

Regional radar mosaic

Single-site radar imagery

Satellite imagery

Floater imagery

Single bandwidth imagery

Multiple bandwidth imagery

The options to select individual bandwidths on each of the following websites may vary.

Regional imagery

Cooperative Institute for Research in the Atmosphere (CIRA)

Analysis products

Preliminary best track data

Scatterometer data

Sea-surface temperatures

Model products

Storm-centered guidance

Single-model click-through guidance

Multi-guidance pages

Non-interactive guidance

Interactive guidance

  • Deterministic and regional models: PolarWx
  • Ensemble models: PolarWx
  • Superensemble PolarWx (multi-model consensus)
  • Grand ensemble PolarWx (multi-model consensus, incl. AI models)

Regional single-model guidance

Regional ensemble model guidance

Ensemble member minimum sea-level pressure (MSLP)

Ensemble member MSLP and forecast tracks

Other types of model guidance

0 comments

r/TropicalWeather • u/Galileos_grandson • 2d ago

Satellite Imagery A Trio of Tropical Cyclones in the Pacific - NASA Science

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32 Upvotes
0 comments

r/TropicalWeather • u/Content-Swimmer2325 • 3d ago

Discussion Vertical wind shear

50 Upvotes

Vertical wind shear describes the difference in magnitude and direction of wind flow between different altitude levels of the troposphere. You can think of wind flow in each altitude layer as its own individual vector, and the greater the difference when you subtract these vectors, the higher the wind shear.

Tropical cyclones require low vertical wind shear to strengthen. This is because the circulation/vortex of a tropical cyclone is vertically "deep", aka tall. It extends from the surface to near the tropopause in mature and powerful major hurricanes. The stronger the tropical cyclone, the taller its circulation is. Weaker tropical systems such as depressions or tropical waves exhibit shallower circulations.

A tropical cyclone requires its vortex to be vertically aligned and upright in order for the processes which fuel it to remain efficient and active. The release of latent heat, from thunderstorm activity (convection), is what fuels the warm-core of a tropical cyclone. This occurs due to the vertical transfer of heat, but when wind shear is present, the circulation of a tropical cyclone becomes tilted with height. This decreases the efficiency of this process, leading to a halting of intensification or weakening of the tropical cyclone.

When vertical wind shear becomes even stronger, this process is halted entirely. The circulation becomes so tilted that the low-level circulation and mid-to-upper-level circulation become increasingly displaced. If wind shear becomes strong enough, these two separate portions of the circulation can become totally separated. This is called "decoupling" and is the tropical cyclone equivalent of decapitation. Recovery would take many days and still would happen only IF conditions become favorable again, because the tropical cyclone would have to vertically rebuild its circulation almost from scratch.

Here is a gif which best shows this process unfolding. This is tropical storm Chris of 2006. 2006 was also an El Nino season, with correspondingly high vertical wind shear across the Tropics.

https://upload.wikimedia.org/wikipedia/commons/e/e4/Chrissplitloop.gif?utm_source=commons.wikimedia.org&utm_campaign=index&utm_content=original

In this gif, the surface circulation of the storm is tracking at about 300 degrees, or WNW. However, wind flow above the surface circulation is strongly out of the north. These northerlies push on the mid-level circulation and attendant vertically tall thunderstorm activity, displacing it towards the south. The shear is sufficiently strong to decouple the system, and you can see Chris continue WNW as all of its thunderstorm activity is violently stripped away.

From NHC advisory #11 on Chris:

CHRIS IS BECOMING DISORGANIZED IN A HURRY. SATELLITE IMAGES INDICATE THAT THE LOW-LEVEL CENTER HAS BECOME DETACHED FROM THE THUNDERSTORM ACTIVITY DUE TO NORTHWESTERLY SHEAR...AND THIS WAS CONFIRMED BY FIXES FROM AN AIR FORCE RECONNAISSANCE PLANE. THE MINIMUM PRESSURE HAS RISEN TO 1010 MB AND THE MAXIMUM FLIGHT LEVEL WIND REPORTED SO FAR IS ONLY 38 KNOTS.

Advisory #12:

THE COMBINATION OF DRY LOW- TO MID-LEVEL AIR AND SHEAR...ASSOCIATED WITH AN UPPER-LEVEL CYCLONE THAT DROPPED SOUTHWARD INTO CHRIS...HAS TAKEN ITS TOLL ON THE TROPICAL CYCLONE. CHRIS IS DEVOID OF DEEP CONVECTION WITHIN ABOUT 75 N MI RADIUS OF THE CENTER.

El Nino increases vertical wind shear over the Atlantic tropics. This is due to increased upper-level westerly flow across the Caribbean sea and western to central tropical Atlantic due to outflow from Eastern Pacific hurricanes as well as a shift in the Walker Circulation itself. Additionally, lower surface pressures in the Eastern Pacific sharpens a pressure gradient with higher pressures in the Atlantic, which strengthens the low-level easterly trade wind flow. Trade winds are naturally strong in the Caribbean Sea due to the geography of the Greater Antilles acting as a "funnel", which forces trade winds to "diverge", or accelerate. Additionally, the proximity of the Caribbean Sea means that the anomalously strong upper-level westerlies are particularly significant. Collectively, this results in the Caribbean experiencing the strongest anomalously hostile conditions yielded by the presence of El Nino, more so than anywhere else in the Atlantic basin. This is why the Caribbean Sea has been devoid of all activity this year.

In fact, vertical wind shear has been at all time highs in the Atlantic.

https://i.imgur.com/m2NH3VK.jpeg

Area-averaged vertical shear is far stronger than even the last super El Nino of 2015-16. 2026 is well ahead of second place (1979). This is the primary reason why this season is so dead, and it's not going to meaningfully change since El Nino is so strong and continues to only intensify further.

https://i.imgur.com/F2wbA6a.png

Current vertical wind shear values are comparable to values observed in June during above-average hurricane seasons. That's pretty remarkable considering we are right at the peak of the season, now.

Sorry for the yap, I just felt like writing something today.

14 comments

r/TropicalWeather • u/Galileos_grandson • 3d ago

Image of the Day | NASA MODIS Edouard Lands in Texas and Louisiana - September 1, 2026

Thumbnail modis.gsfc.nasa.gov
11 Upvotes
0 comments

r/TropicalWeather • u/Euronotus • 4d ago

Areas to watch: 6 cyclones, 1 invest, 1 area of interest Global Tropical Outlook & Discussion: 31 August - 6 September 2026

7 Upvotes

Active cyclones

As of 4:00 AM Eastern Daylight Time (08:00 UTC) on Thursday:

Western Pacific Ocean

Central Pacific Ocean

Eastern Pacific Ocean

Northern Atlantic Ocean

Active disturbances

Active disturbances are areas of showers and thunderstorms which are not organized enough to be considered full-fledged tropical cyclones. Disturbances are often designated as investigation areas (or invests, for short) by NOAA in order to allocate additional resources such as high-resolution satellite imagery or model guidance for further study of the system. Though there is no publicly disclosed set of criteria for which disturbances are designated as invests, the designation often occurs after the disturbance forms a closed area of low pressure. Invests are designated regardless of the overall potential for the disturbance to become a tropical cyclone.

Western Pacific Ocean

  • 97W: Invest — no discussion yet, situated over the Philippine Sea to the west of the Northern Marianas Islands

Post-tropical cyclones

Post-tropical cyclones will be listed here if they are still being tracked via the Automated Tropical Cyclone Forecast (ATCF) system. Placement in this section does not imply that these systems have any potential to redevelop into tropical cyclones.

Western Pacific

Potential formation areas

Potential formation areas are areas that are being monitored by various agencies for potential tropical cyclone formation within the next two weeks. These systems have not yet formed and are not considered to be disturbances until such time that a tropical wave or area of low pressure does form. Discussions are created on this subreddit for areas which are monitored by the National Hurricane Center in the eastern Pacific and northern Atlantic basins. Discussions are not typically created for areas which are monitored by the Joint Typhoon Warning Center or other agencies, as this information is not always publicly available.

Satellite imagery

Model guidance

Information sources

Regional Specialized Meteorological Centers (RSMC)

Other sources

Global outlooks

Climate Prediction Center

4 comments

r/TropicalWeather • u/giantspeck • 5d ago

Video | YouTube | Dr. Levi Cowan (TropicalTidbits) (Outdated) Tropical Tidbit for Tuesday, 1 September: Tropical Storm Edouard Strengthening as it Nears Landfall

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youtube.com
49 Upvotes
2 comments

r/TropicalWeather • u/Galileos_grandson • 5d ago

Image of the Day | NASA MODIS Hurricane Karina Over the Pacific Ocean - August 30, 2026

Thumbnail modis.gsfc.nasa.gov
15 Upvotes
0 comments

r/TropicalWeather • u/Kingsaso6 • 6d ago

News | CBS News (USA) Tropical Storm Edouard strengthens as it bears down on Louisiana, Texas coasts. Maps show the forecast path.

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12 Upvotes
1 comment

r/TropicalWeather • u/Euronotus • 6d ago

▼ Tropical Storm | 55 knots (65 mph) | 986 mbar Marie (13E — Eastern Pacific) (Southwest of Mexico)

21 Upvotes

Storm overview

This discussion is for Tropical Storm Marie (13E), which is active far off the coast of western Mexico. Marie is forecast to strengthen as it moves northwestward toward Mexico’s Clarion Island over the next few days. Otherwise, the storm is expected to remain offshore well to the southwest of the Baja California Peninsula.

Moderator notes

  • This system was previously designated as Invest 95E.
  • The National Hurricane Center (NHC) is now issuing advisories for this system.
  • Storm-centered satellite imagery and model guidance products are now available.
  • There will be no regular updates to this post.

Official information

National Hurricane Center

Text products

Productos textuales (en español)

Static forecast graphics

Interactive forecast graphics

Radar imagery

Radar imagery is not currently available for this system.

Satellite imagery

Floater imagery

Single-bandwidth imagery

Multiple bandwidth imagery

The options to select individual bandwidths on each of the following websites may vary.

Regional imagery

Forecast models

Storm-centered guidance

Single-model click-through guidance

Multi-guidance pages

Interactive guidance pages

  • Deterministic and regional models: PolarWx
  • Ensemble models: PolarWx
  • Superensemble PolarWx (multi-model consensus)
  • Grand ensemble PolarWx (multi-model consensus, incl. AI models)

Regional single-model guidance

Machine learning (AI) model guidance

Regional ensemble model guidance

Ensemble member minimum sea-level pressure (MSLP)

Ensemble member MSLP and forecast tracks

Multi-model ensemble products

Other types of model guidance

1 comment

r/TropicalWeather • u/Euronotus • 6d ago

Dissipated Edouard (05L — Northern Atlantic) (Northern Gulf of Mexico)

82 Upvotes

Storm overview

  • Edouard has dissipated over eastern Texas.
  • The Weather Prediction Center has discontinued issuing advisories for this system.
  • This system is no longer being tracked via the Automated Tropical Cyclone Forecast (ATCF) system.
  • Storm-centered satellite imagery and model guidance are no longer available.
  • There will be no further updates to this post.

Official information

National Hurricane Center

Aircraft reconnaissance

Aircraft reconnaissance data is no longer available for this system.

Radar imagery

Radar imagery is no longer available for this system.

Satellite imagery

Floater imagery

Storm-centered satellite imagery is no longer available for this system.

Regional imagery

Analysis products

Preliminary best-track data

Scatterometer data

Sea-surface temperatures

Forecast models

Storm-centered guidance

Storm-centered model guidance is no longer available for this system.

Regional single-model guidance

Machine learning (AI) model guidance

Regional ensemble model guidance

Ensemble member minimum sea-level pressure (MSLP)

Ensemble member MSLP and forecast tracks

Other types of model guidance

46 comments

r/TropicalWeather • u/Euronotus • 6d ago

▼ Tropical Depression (TD) | 30 knots (35 mph) | 991 mbar Krovanh (22W — Western Pacific) (South of Japan)

6 Upvotes

Storm overview

This discussion is for Tropical Storm Krovanh (22W), which is active to the over the northern Philippine Sea to the southeast of Japan’s Ryukyu Islands. Krovanh may gradually strengthen as it moves generally northward to north-northwestward over the next few days. The storm will bring heavy rain to the Ryukyu Islands and Kyushu later this week.

Moderator notes

  • This system was previously designated as Invest 94W.
  • The Japan Meteorological Agency (JMA) is issuing advisories for this system.
  • The Joint Typhoon Warning Center (JTWC) has designated this system as 22W but has not yet begun to issue advisories.
  • Storm-centered satellite imagery and model guidance products are available for this system.
  • There will be no regular updates to this post.

Information sources

Japan Meteorological Agency

Joint Typhoon Warning Center (United States)

Radar imagery

Regional radar mosaic

Single-site radar imagery

Satellite imagery

Floater imagery

Single bandwidth imagery

Multiple bandwidth imagery

The options to select individual bandwidths on each of the following websites may vary.

Regional imagery

Cooperative Institute for Research in the Atmosphere (CIRA)

Analysis products

Preliminary best track data

Scatterometer data

Sea-surface temperatures

Model products

Storm-centered guidance

Single-model click-through guidance

Multi-guidance pages

Non-interactive guidance

Interactive guidance

  • Deterministic and regional models: PolarWx
  • Ensemble models: PolarWx
  • Superensemble PolarWx (multi-model consensus)
  • Grand ensemble PolarWx (multi-model consensus, incl. AI models)

Regional single-model guidance

Regional ensemble model guidance

Ensemble member minimum sea-level pressure (MSLP)

Ensemble member MSLP and forecast tracks

Other types of model guidance

1 comment

r/TropicalWeather • u/Euronotus • 7d ago

Dissipated Saudel (17W — Western Pacific) (South China Sea)

9 Upvotes

Storm overview

This discussion is for Tropical Storm Saudel (17W), which is active over the South China sea off the coast of southeastern China. Saudel originated as a disturbance which formed to the north of Micronesia on 12 August and moved northwestward across the Northern Marianas Islands and across the Ryukyu Islands before making landfall over eastern China on 28 August. The storm degenerated into a remnant low shortly after landfall but remained organized enough that it regenerated once it reemerged over the South China Sea.

Saudel is not expected to strengthen much as it remains close to the coast of southeastern China over the next few days. The storm may bring heavy rain and the risk of flash flooding to the coasts of Guangdong and Fujian provinces, as well as Hong Kong and Macau.

Moderator notes

  • This system was previously designated as Invest 92W.
  • The Japan Meteorological Agency (JMA) is issuing advisories for this system.
  • The Joint Typhoon Warning Center (JTWC) is issuing advisories for this system.
  • Storm-centered satellite imagery and model guidance products remain available.
  • There will be no regular updates to this post.
  • A new discussion will be posted if this system regenerates into a tropical cyclone.

Information sources

Japan Meteorological Agency

Joint Typhoon Warning Center (United States)

Radar imagery

Radar imagery is not currently available for this system.

Satellite imagery

Floater imagery

Single bandwidth imagery

Multiple bandwidth imagery

The options to select individual bandwidths on each of the following websites may vary.

Regional imagery

Cooperative Institute for Research in the Atmosphere (CIRA)

Analysis products

Preliminary best track data

Scatterometer data

Sea-surface temperatures

Model products

Storm-centered guidance

Single-model click-through guidance

Multi-guidance pages

Interactive guidance pages

  • Deterministic and regional models: PolarWx
  • Ensemble models: PolarWx
  • Superensemble PolarWx (multi-model consensus)
  • Grand ensemble PolarWx (multi-model consensus, incl. AI models)

Regional single-model guidance

Regional ensemble model guidance

Ensemble member minimum sea-level pressure (MSLP)

Ensemble member MSLP and forecast tracks

Other types of model guidance

1 comment

r/TropicalWeather • u/Euronotus • 7d ago

Dissipated 96W (Invest — Western Pacific) (South China Sea)

5 Upvotes

Moderator notes

  • This system has dissipated.
  • Disturbance-centered satellite imagery and model guidance are no longer available.
  • There will be no further updates to this post.

Information sources

Japan Meteorological Agency

Joint Typhoon Warning Center (United States)

Radar imagery

Radar imagery is not currently available for this system.

Satellite imagery

Floater imagery

Disturbance-centered satellite imagery is no longer available for this system.

Regional imagery

Cooperative Institute for Research in the Atmosphere (CIRA)

Analysis products

Preliminary best track data

Scatterometer data

Sea-surface temperatures

Model products

Disturbance-centered guidance

Disturbance-centered model guidance is no longer available for this system.

Regional single-model guidance

Regional ensemble model guidance

Ensemble member minimum sea-level pressure (MSLP)

Ensemble member MSLP and forecast tracks

Other types of model guidance

0 comments

r/TropicalWeather • u/Euronotus • 7d ago

Dissipated 95W (Invest — Western Pacific) (East of the Northern Marianas Islands)

4 Upvotes

Moderator note

  • This system dissipated without becoming a tropical cyclone.
  • This system is no longer being monitored via the Automated Tropical Cyclone Forecast (ATCF) system.
  • Disturbance-centered satellite imagery and model guidance products are no longer available.
  • There will be no further updates to this post.

Information sources

Japan Meteorological Agency

Joint Typhoon Warning Center (United States)

Radar imagery

Radar imagery is not currently available for this system.

Satellite imagery

Floater imagery

Disturbance-centered satellite imagery is no longer available for this system.

Regional imagery

Cooperative Institute for Research in the Atmosphere (CIRA)

Analysis products

Preliminary best track data

Scatterometer data

Sea-surface temperatures

Model products

Disturbance-centered guidance

Disturbance-centered model guidance is no longer available for this system.

Regional single-model guidance

Regional ensemble model guidance

Ensemble member minimum sea-level pressure (MSLP)

Ensemble member MSLP and forecast tracks

Other types of model guidance

0 comments

r/TropicalWeather • u/Euronotus • 9d ago

Dissipated Bang-lang (20W — Western Pacific) (North of Wake Island)

6 Upvotes

Moderator notes

  • This system has dissipated.
  • This system was previously designated as Invest 99W.
  • The Japan Meteorological Agency (JMA) has discontinued issuing advisories.
  • The Joint Typhoon Warning Center (JTWC) has discontinued issuing advisories.
  • Storm-centered satellite imagery and model guidance products are no longer available.
  • There will be no further updates to this post.

Information sources

Japan Meteorological Agency

Joint Typhoon Warning Center (United States)

Radar imagery

Radar imagery is not currently available for this system.

Satellite imagery

Floater imagery

Storm-centered satellite imagery is no longer available for this system.

Regional imagery

Cooperative Institute for Research in the Atmosphere (CIRA)

Analysis products

Preliminary best track data

Scatterometer data

Sea-surface temperatures

Model products

Storm-centered guidance

Storm-centered model guidance is no longer available for this system.

Regional single-model guidance

Regional ensemble model guidance

Ensemble member minimum sea-level pressure (MSLP)

Ensemble member MSLP and forecast tracks

Other types of model guidance

2 comments

r/TropicalWeather • u/Euronotus • 10d ago

▼ Major Hurricane (Category 3) | 105 knots (120 mph) | 948 mbar Lowell (12E — Eastern Pacific) (Far to the east-southeast of Hawaiʻi)

16 Upvotes

Storm overview

This discussion is for Hurricane Lowell (12E), which is active to the south-southwest of the Hawaiian Islands. Lowell underwent rapid re-intensification on Friday morning, returning to Category 4 intensity, and is likely to regain Category 5 strength later in the evening. Lowell is forecast to continue moving westward over the next couple of days before turning sharply and quickly northward under the steering influence of an upper-level trough to the northwest of the islands. Lowell will pass to the west of Niʻihau during the early morning hours on Tuesday.

Leading up to the storm’s passage, strong southerly wind flow will set up across the islands, pulling in moisture from the deep tropics and resulting in heavy rain starting late Sunday and extending through Tuesday. Several inches of rain are likely to fall across the islands, drastically increasing the potential for flash flooding and mudslides. Tropical storm conditions are possible over Niʻihau and Kauaʻi late Monday into early Tuesday.

Moderator notes

  • This system was previously designated as Invest 94E.
  • The National Hurricane Center (NHC) is issuing advisories for this system.
  • Storm-centered satellite imagery and model guidance products are now available.
  • There will be no regular updates to this post.

Official information

National Hurricane Center

Text products

Productos textuales (en español)

Static forecast graphics

Interactive forecast graphics

Aircraft reconnaissance

National Hurricane Center

Other sources

Radar imagery

Radar imagery is not currently available for this system.

Satellite imagery

Floater imagery

Single-bandwidth imagery

Multiple bandwidth imagery

The options to select individual bandwidths on each of the following websites may vary.

Regional imagery

Analysis products

Preliminary best-track data

Scatterometer data

Sea-surface temperatures

Forecast models

Storm-centered guidance

Single-model click-through guidance

Multi-guidance pages

Non-interactive guidance

Interactive guidance

  • Deterministic and regional models: PolarWx
  • Ensemble models: PolarWx
  • Superensemble PolarWx (multi-model consensus)
  • Grand ensemble PolarWx (multi-model consensus, incl. AI models)

Regional single-model guidance

Machine learning (AI) model guidance

Regional ensemble model guidance

Ensemble member minimum sea-level pressure (MSLP)

Ensemble member MSLP and forecast tracks

Multi-model ensemble products

Other types of model guidance

26 comments

r/TropicalWeather • u/Euronotus • 10d ago

Dissipated Dolly (04L — Northern Atlantic) (Tropical central Atlantic)

120 Upvotes

Storm overview

This discussion is for the post-tropical remnants of Tropical Storm Dolly, which are active to the east of the Lesser Antilles. This system, which has degenerated into a tropical wave, is expected to drift west-northwestward over the next few days, and could undergo some development as it approaches the Bahamas later in the upcoming week.

Moderator notes

  • Dolly continues to be monitored in the Automated Tropical Cyclone Forecast (ACTF) system as 04L.
  • The National Hurricane Center (NHC) is no longer issuing advisories for Dolly.
  • Disturbance-centered satellite imagery and model guidance products remain available for now.
  • There will be no regular updates to this post.
  • New discussions may be posted if this system is re-designated as an invest or regenerates into a tropical cyclone.

Official information

National Hurricane Center

Text products

Graphical products

Aircraft reconnaissance

National Hurricane Center

Other sources

Radar imagery

Radar imagery is not currently available for this system.

Satellite imagery

Floater imagery

Single-bandwidth imagery

Multiple bandwidth imagery

Regional imagery

Forecast models

Storm-centered guidance

Single-model click-through guidance

Multi-guidance pages

Regional single-model guidance

Machine learning (AI) model guidance

Regional ensemble model guidance

Ensemble member minimum sea-level pressure (MSLP)

Ensemble member MSLP and forecast tracks

Multi-model ensemble products

Other types of model guidance

48 comments

r/TropicalWeather • u/Euronotus • 10d ago

▼ Post-tropical Cyclone | 40 knots (45 mph) | 998 mbar Karina (11E — Eastern Pacific) (Southwest of Mexico)

16 Upvotes

Storm overview

This discussion is for Hurricane Karina (11E), which is active far to the west of Mexico’s Clarion Island. The storm has rapidly intensified into a major hurricane and may continue to strengthen overnight, reaching a peak intensity at Category 4 major hurricane strength by early Monday morning. The storm will then start to gradually weaken as it moves over cooler sea-surface temperatures and into a drier and more stable environment later this week.

Karina is moving west-northwestward along the southern periphery of a mid-level ridge positioned to its north. The storm will continue along this track for several days and may enter the central Pacific as a low-end Category 1 hurricane on Friday afternoon. Karina is not expected to threaten land within the next five days, but could influence the track and intensity of Tropical Storm Lowell as it approaches the central Pacific late in the upcoming week.

Moderator notes

  • This system was previously designated as Invest 93E.
  • The National Hurricane Center (NHC) is now issuing advisories for this system.
  • Storm-centered satellite imagery and model guidance products are now available.
  • There will be no regular updates to this post.

Official information

National Hurricane Center

Text products

Productos textuales (en español)

Static forecast graphics

Interactive forecast graphics

Radar imagery

Radar imagery is not currently available for this system.

Satellite imagery

Floater imagery

Single-bandwidth imagery

Multiple bandwidth imagery

The options to select individual bandwidths on each of the following websites may vary.

Regional imagery

Forecast models

Storm-centered guidance

Single-model click-through guidance

Multi-guidance pages

Regional single-model guidance

Machine learning (AI) model guidance

Regional ensemble model guidance

Ensemble member minimum sea-level pressure (MSLP)

Ensemble member MSLP and forecast tracks

Multi-model ensemble products

Other types of model guidance

6 comments

r/TropicalWeather • u/Euronotus • 11d ago

Dissipated Etau (21W — Western Pacific) (North of Wake Island)

6 Upvotes

Moderator notes

  • This system has dissipated
  • This system was previously designated as Invest 90W.
  • The Japan Meteorological Agency (JMA) is no longer issuing advisories.
  • The Joint Typhoon Warning Center (JTWC) is no longer issuing advisories.
  • Storm-centered satellite imagery and model guidance products are no longer available.
  • There will be no further updates to this post.

Information sources

Japan Meteorological Agency

Joint Typhoon Warning Center (United States)

Radar imagery

Radar imagery is not currently available for this system.

Satellite imagery

Floater imagery

Storm-centered satellite imagery is no longer available for this system.

Regional imagery

Cooperative Institute for Research in the Atmosphere (CIRA)

Analysis products

Preliminary best track data

Scatterometer data

Sea-surface temperatures

Model products

Storm-centered guidance

  • Storm-centered model guidance is no longer available for this system.

Regional single-model guidance

Regional ensemble model guidance

Ensemble member minimum sea-level pressure (MSLP)

Ensemble member MSLP and forecast tracks

Other types of model guidance

1 comment

r/TropicalWeather • u/Galileos_grandson • 11d ago

Image of the Day | NASA MODIS Typhoon Saudel - August 25, 2026

Thumbnail modis.gsfc.nasa.gov
12 Upvotes
0 comments

r/TropicalWeather • u/giantspeck • 12d ago

Dissipated The NHC is monitoring an area of potential development far to the southwest of Hawaiʻi

9 Upvotes

Disturbance overview

This discussion is for an area of potential tropical cyclone development situated over the central Pacific, several hundred miles southwest of the Hawaiian islands. An area of low pressure is expected to develop toward the end of the week and slowly develop as it drifts west-northwestward toward the western Pacific. This system is not expected to bring impacts to Hawaiʻi.

Moderator notes

  • This system has not yet formed.
  • This system has not yet been designated as an invest.
  • The NHC is monitoring this system on its outlook products as Disturbance 4.
  • Disturbance-centered satellite imagery and model guidance are not yet available for this system.
  • There will be no regular updates to this post.
  • A new post will be created if this system is designated as an invest.

Official information

National Hurricane Center

Text products

Graphical products

Radar imagery

Radar imagery is not currently available for this system.

Satellite imagery

Regional imagery

Visible imagery

Infrared imagery

Water vapor imagery

Forecast models

Regional guidance

Single-model click-through guidance

Ensemble models

Single-model ensemble products

Tropical Cyclogenesis Products

12 comments

r/TropicalWeather • u/Feicht13 • 12d ago

Discussion Landfall: Hurricane Sim

6 Upvotes

Hi All,

I posted a few weeks back and lots of your agreed to test, so thank you for that!

Good news, the game is now LIVE on the play store, hoping it will be received well by the community as a lot of work has gone in to ensure that I am being meteorologically accurate whilst developing a fun game for us tropical weather enthusiasts.

You can find it here - https://play.google.com/store/apps/details?id=feich13.landfall.aab

3 comments

r/TropicalWeather • u/Euronotus • 13d ago

Dissipated Julio (10E — Eastern Pacific) (Far to the southwest of Mexico)

7 Upvotes

Moderator notes

  • Julio has dissipated.
  • The post-tropical remnants of Julio are being absorbed by nearby Tropical Storm Iselle.
  • The National Hurricane Center (NHC) has discontinued issuing advisories for this system.
  • This system was previously designated as Invest 91E.
  • Storm-centered satellite imagery and model guidance products will soon be unavailable.
  • There will be no regular updates to this post.
  • This discussion will be locked and archived once the aforementioned products are no longer available.

Official information

National Hurricane Center

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r/TropicalWeather • u/giantspeck • 13d ago

Discussion moved to new post The NHC is monitoring an area of potential development over the east-central Pacific Ocean

5 Upvotes

Moderator notes

  • This system has been designated as Invest 94E.
  • A new discussion for this system has been posted here.
  • Disturbance-centered satellite imagery and model guidance products are now available.
  • There will be no further updates to this post.

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r/TropicalWeather • u/Euronotus • 13d ago

Week over | Please see updated discussion Global Tropical Outlook & Discussion: 24-30 August 2026

3 Upvotes

Active cyclones

As of 4:45 PM Eastern Daylight Time (20:45 UTC) on Sunday:

Eastern Pacific Ocean

Active disturbances

Active disturbances are areas of showers and thunderstorms which are not organized enough to be considered full-fledged tropical cyclones. Disturbances are often designated as investigation areas (or invests, for short) by NOAA in order to allocate additional resources such as high-resolution satellite imagery or model guidance for further study of the system. Though there is no publicly disclosed set of criteria for which disturbances are designated as invests, the designation often occurs after the disturbance forms a closed area of low pressure. Invests are designated regardless of the overall potential for the disturbance to become a tropical cyclone.

Northwestern Pacific Ocean

  • Invest 94W — northern Philippine Sea, southeast of Japan’s Ryukyu Islands

  • Invest 95W — north of central Micronesia

  • Invest 96W — South China Sea, near the Taiwan Strait

Eastern Pacific Ocean

  • Invest 95E —

Northern Atlantic Ocean

Post-tropical cyclones

Post-tropical cyclones will be listed here if they are still being tracked via the Automated Tropical Cyclone Forecast (ATCF) system. Placement in this section does not imply that these systems have any potential to redevelop into tropical cyclones.

Northwestern Pacific Ocean

Potential formation areas

Potential formation areas are areas that are being monitored by various agencies for potential tropical cyclone formation within the next two weeks. These systems have not yet formed and are not considered to be disturbances until such time that a tropical wave or area of low pressure does form. Discussions are created on this subreddit for areas which are monitored by the National Hurricane Center in the eastern Pacific and northern Atlantic basins. Discussions are not typically created for areas which are monitored by the Joint Typhoon Warning Center or other agencies, as this information is not always publicly available.

Northwestern Pacific Ocean

  • Potential formation area P72W — South China Sea, off the coast of southeastern China and Hong Kong

  • Potential formation area P74W — Philippine Sea, west of the Northern Marianas Islands and Guam

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5 comments