497
WWUS20 KWNS 122030
SEL8
SPC WW 122030
COZ000-NEZ000-WYZ000-130300-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 578
NWS STORM PREDICTION CENTER NORMAN OK
230 PM MDT WED AUG 12 2026
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHEAST COLORADO
THE NEBRASKA PANHANDLE
SOUTHEAST WYOMING
* EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 230 PM
UNTIL 900 PM MDT.
* PRIMARY THREATS INCLUDE...
SCATTERED DAMAGING WINDS AND ISOLATED SIGNIFICANT GUSTS TO 80
MPH POSSIBLE
SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2.5
INCHES IN DIAMETER POSSIBLE
SUMMARY...ISOLATED STORM DEVELOPMENT IS UNDERWAY ACROSS SOUTHEAST
WYOMING, AND ADDITIONAL STORMS ARE EXPECTED THIS AFTERNOON INTO THE
NEBRASKA PANHANDLE AND NORTHEAST COLORADO. LARGE HAIL (POTENTIALLY
EXCEEDING 2 INCHES IN DIAMETER) WILL BE POSSIBLE WITH
INITIAL/DISCRETE SUPERCELLS, WHILE THE THREAT FOR SEVERE OUTFLOW
GUSTS OF 60-80 MPH WILL INCREASE WITH STORM CLUSTERING LATER THIS
AFTERNOON THROUGH LATE EVENING.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75
STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES NORTHWEST OF
CHADRON NE TO 15 MILES SOUTHWEST OF AKRON CO. 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 575...WW 576...WW 577...
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO
2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS. A
FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR
24035.
...THOMPSON
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