Severe Weather Outlook
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Severe Weather Watches Overview
Watch data currently updates every 15 minutes.
- Severe Thunderstorm Watch #0638 for Delaware, Northeast Maryland, New Jersey, Southern New York, Central and Eastern Pennsylvania, Coastal Waters
-
- Scattered damaging wind gusts to 70 mph likely
- Scattered large hail events to 1.5 inches in diameter possible
- A tornado or two possible
- Severe Thunderstorm Watch #0639 for Far Northwest Iowa, Far Southwest Minnesota, North-Central and Northeast Nebraska, Southeast South Dakota
-
- Scattered damaging winds likely with isolated significant gusts to 80 mph possible
- Scattered large hail likely with isolated very large hail events to 2 inches in diameter possible
- A tornado or two possible
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Severe Thunderstorm Watch #0638
Locations Affected
Severe Thunderstorm Watch Summary
Supercell thunderstorms should pose a threat for large hail this afternoon as they track east-southeastward across the northern Mid-Atlantic. The threat for scattered severe/damaging winds should increase this evening as one or more clusters develops. A tornado or two may also occur with any sustained supercell.
Severe Weather Threats
Severe Thunderstorm Watch Details
SEL8 URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 638 NWS Storm Prediction Center Norman OK 435 PM EDT Tue Sep 1 2026 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Delaware Northeast Maryland New Jersey Southern New York Central and Eastern Pennsylvania Coastal Waters * Effective this Tuesday afternoon from 435 PM until Midnight EDT. * Primary threats include... Scattered damaging wind gusts to 70 mph likely Scattered large hail events to 1.5 inches in diameter possible A tornado or two possible SUMMARY...Supercell thunderstorms should pose a threat for large hail this afternoon as they track east-southeastward across the northern Mid-Atlantic. The threat for scattered severe/damaging winds should increase this evening as one or more clusters develops. A tornado or two may also occur with any sustained supercell. The severe thunderstorm watch area is approximately along and 80 statute miles east and west of a line from 50 miles north northwest of Wilkesbarre PA to 35 miles east southeast of Dover DE. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU8). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && AVIATION...A few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 31025. ...Gleason
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Severe Thunderstorm Watch #0639
Locations Affected
Severe Thunderstorm Watch Summary
Initial supercells will likely pose a threat for large hail up to 2 inches in diameter. A tornado or two may also occur with any sustained supercell, especially if thunderstorms can remain at least semi-discrete through early evening as low-level shear increases. Otherwise, a bowing cluster is expected to eventually develop and pose a greater threat for severe/damaging winds up to 70-80 mph as it tracks generally eastward across southeast South Dakota/northeast Nebraska and vicinity.
Severe Weather Threats
Severe Thunderstorm Watch Details
SEL9
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 639
NWS Storm Prediction Center Norman OK
350 PM CDT Tue Sep 1 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Far Northwest Iowa
Far Southwest Minnesota
North-Central and Northeast Nebraska
Southeast South Dakota
* Effective this Tuesday afternoon and evening from 350 PM until
1100 PM CDT.
* Primary threats include...
Scattered damaging winds likely with isolated significant gusts
to 80 mph possible
Scattered large hail likely with isolated very large hail events
to 2 inches in diameter possible
A tornado or two possible
SUMMARY...Initial supercells will likely pose a threat for large
hail up to 2 inches in diameter. A tornado or two may also occur
with any sustained supercell, especially if thunderstorms can remain
at least semi-discrete through early evening as low-level shear
increases. Otherwise, a bowing cluster is expected to eventually
develop and pose a greater threat for severe/damaging winds up to
70-80 mph as it tracks generally eastward across southeast South
Dakota/northeast Nebraska and vicinity.
The severe thunderstorm watch area is approximately along and 60
statute miles north and south of a line from 60 miles northwest of
Burwell NE to 35 miles east southeast of Sioux Falls SD. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU9).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 638...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 70 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
25030.
...Gleason
National Risk Overview
- Tuesday, September 1
- TORNADO: 2%
- HAIL: 15%
- WIND: 15%
- Wednesday, September 2
- TORNADO: 2%
- HAIL: 15%
- WIND: 30%
- Thursday, September 3
- ANY SEVERE: 15%
- Friday, September 4
- ANY SEVERE: 15%
- Saturday, September 5
- ANY SEVERE: predictability too low
- Sunday, September 6
- ANY SEVERE: predictability too low
- Monday, September 7
- ANY SEVERE: predictability too low
- Tuesday, September 8
- ANY SEVERE: predictability too low
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