587
WWUS20 KWNS 211817
SEL8
SPC WW 211817
ILZ000-INZ000-KYZ000-220200-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 508
NWS STORM PREDICTION CENTER NORMAN OK
120 PM CDT TUE JUL 21 2026
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
FAR SOUTHERN ILLINOIS
FAR SOUTHERN INDIANA
KENTUCKY
* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 120 PM UNTIL
900 PM CDT.
* PRIMARY THREATS INCLUDE...
WIDESPREAD DAMAGING WIND GUSTS TO 70 MPH LIKELY
SCATTERED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE
A TORNADO OR TWO POSSIBLE
SUMMARY...THUNDERSTORMS COVERAGE AND INTENSITY IS EXPECTED TO
INCREASE THIS AFTERNOON ALONG A COLD FRONT PUSHING SOUTHEASTWARD
INTO THE REGION. VERY WARM AND MOIST CONDITIONS AHEAD OF THE FRONT
WILL SUPPORT ROBUST BUOYANCY, WITH MODERATE VERTICAL SHEAR IN PLACE
AS WELL. INITIAL SUPERCELLS COULD PRODUCE ALL SEVERE HAZARDS,
INCLUDING ISOLATED LARGE HAIL AND POTENTIALLY EVEN A BRIEF TORNADO.
A TREND TOWARDS A MORE LINEAR MODE IS ANTICIPATED WITH TIME, WITH
DAMAGING GUSTS AS THE PRIMARY SEVERE RISK.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES EAST NORTHEAST
OF LEXINGTON KY TO 30 MILES NORTH NORTHWEST OF PADUCAH KY. 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.
OTHER WATCH INFORMATION...CONTINUE...WW 506...WW 507...
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
29030.
...MOSIER
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