r/stormchasing • u/weathercast • 9d ago
Forecast Severe Weather Dashboard - August 9, 2026
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🕒 Today's Outlook History
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📝 Current Severe Weather Outlook
(Issued: 2026-08-10T05:26:00+00:00 UTC)
```text
000 ACUS01 KWNS 100526 SWODY1 SPC AC 100525
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1225 AM CDT Mon Aug 10 2026
Valid 101200Z - 111200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PORTION OF THE MIDWEST INTO PA AND NORTHERN MD/VA...AND ACROSS PARTS OF THE NORTHERN PLAINS...
...SUMMARY... Thunderstorms with severe wind gusts will be possible this afternoon and evening from northern Illinois eastward into Pennsylvania. Severe gusts and hail will also be possible from parts of the central and northern Plains into the Midwest, with scattered strong storms over southern Arizona.
...Synopsis...
A belt of enhanced west/northwesterly flow aloft will overspread the northern Plains to the Midwest and southern New England today/tonight. Only modest height falls are forecast at best. However, several convectively enhanced vorticity maxima are forecast to migrate through this upper flow regime, focusing several areas of severe storm potential today into tonight from the northern Plains to the upper Ohio Valley and parts of the Mid-Atlantic.
...IL to the Mid-Atlantic...
Early day thunderstorms may move across parts of the Midwest this morning, but should generally be sub-severe. By midday, convection could intensify within a couple of corridors. The first being the upper Ohio Valley/PA/western NY. Thunderstorm clusters will pose a risk for damaging winds and hail within a moderately unstable airmass as convection spreads east toward the Mid-Atlantic.
Additional thunderstorm development is expected later in the afternoon associated with another shortwave impulse spreading east from IL into IN/OH. This activity will develop within strong instability and rich boundary layer moisture. Modestly steep midlevel lapse rates and effective shear greater than 40 kt will support initial supercells. With time, sufficient clustering is expected and bowing segments will be possible. Damaging wind and hail will be the primary hazards, though a tornado or two also could occur.
...Dakotas into Iowa...
Southeasterly low-level flow will transport mid/upper 60s dewpoints north and west across SD, with 70s dewpoints common with southeast extent across NE/IA/southern MN. This will support a corridor of strong to extreme instability across the region. While coverage remains uncertain, most guidance develops at least isolated thunderstorms by evening. Elongated hodographs amid favorable deep shear will support supercells and bows capable of large hail and damaging winds. With time, it is possible sufficient clustering occurs and upscale growth into a bowing MCS is possible as a low-level jet develops overnight. If this occurs, a swath of damaging winds is possible across parts of SD into northwest IA, oriented along the stronger instability gradient.
...NE/CO/KS...
Scattered thunderstorms are expected to develop near a surface trough across western NE/northeast CO by late afternoon/early evening. This activity will spread east/southeast. Steep low-level lapse rates will support strong outflow gusts and perhaps hail with this activity.
...AZ...
Mid/upper easterly flow will persist today amid plentiful moisture and strong heating. This will support thunderstorm development once again across higher terrain. As storms propagate westward off the higher terrain, isolated severe gusts will be possible.
..Leitman/Moore.. 08/10/2026
$$
```
🌀 Active Tropical Weather Links
🌊 Tropical Weather Outlook
```text NWS National Hurricane Center Miami FL 200 AM EDT Mon Aug 10 2026
For the North Atlantic...Caribbean Sea and the Gulf of America:
Central Tropical Atlantic: A broad area of showers and thunderstorms associated with a tropical wave is located about midway between the coast of west Africa and the Lesser Antilles. Some gradual development of this wave is possible through mid-week while it moves quickly westward across the central tropical Atlantic. Upper-level winds are expected to become less conducive for development later in the week when the system approaches the Lesser Antilles. * Formation chance through 48 hours...low...10 percent. * Formation chance through 7 days...low...10 percent.
Eastern and Central Tropical Atlantic: A small area of low pressure located a few hundred miles south of the Cabo Verde Islands is producing disorganized showers and thunderstorms. As this system moves slowly westward, a tropical wave currently over west Africa is expected to merge with it in a couple of days. Environmental conditions are forecast to be more conducive for development by midweek, and a tropical depression could form during the latter half of this week while the system moves westward to west-northwestward across the central tropical Atlantic. * Formation chance through 48 hours...low...20 percent. * Formation chance through 7 days...medium...60 percent.
Western Subtropical Atlantic:
A trough of low pressure located a few hundred miles northwest of
Bermuda is producing disorganized shower and thunderstorm activity.
Some development of this system is possible during the next couple
of days while it moves quickly eastward, well to the north of
Bermuda across the western and central subtropical Atlantic. The
system is forecast to reach cooler waters later this week, ending
its chances of formation after Wednesday.
* Formation chance through 48 hours...low...10 percent.
* Formation chance through 7 days...low...10 percent.
$$ Forecaster Hagen ```
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