

000 

WWUS20 KWNS 042004

SEL5

SPC WW 042004

IDZ000-NVZ000-UTZ000-050300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 665

NWS STORM PREDICTION CENTER NORMAN OK

205 PM MDT TUE SEP 4 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST IDAHO

       NORTHEAST NEVADA

       NORTHERN UTAH



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 205 PM UNTIL

900 PM MDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 90

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 85 MILES WEST

SOUTHWEST OF WENDOVER UTAH TO 65 MILES EAST SOUTHEAST OF MALAD

CITY IDAHO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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.



DISCUSSION...THUNDERSTORMS ARE INTENSIFYING OVER NORTHEAST NV AHEAD

OF UPPER TROUGH...AND IN REGION OF STRONG DAYTIME HEATING.  THESE

STORMS ARE LIKELY TO BECOME SEVERE THIS AFTERNOON AND EARLY

EVENING...MOVING/DEVELOPING EASTWARD INTO PARTS OF NORTHERN UT AND

SOUTHEAST ID.  COOLING TEMPERATURES ALOFT AND FAVORABLE VERTICAL

SHEAR PROFILES INDICATE A RISK OF BOWS/SUPERCELLS CAPABLE OF HAIL

AND DAMAGING WINDS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 24030.





...HART

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