WATCHES: Severe Thunderstorm Watch Number 489

WWUS20 KWNS 212041
SEL9
SPC WW 212041
IDZ000-UTZ000-WYZ000-220300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 489
NWS STORM PREDICTION CENTER NORMAN OK
240 PM MDT SUN JUN 21 2009

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

EASTERN IDAHO
NORTHERN INTO CENTRAL UTAH
FAR SOUTHWEST WYOMING

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 240 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 65
STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES SOUTHEAST OF
DUGWAY UTAH TO 45 MILES NORTHEAST OF POCATELLO IDAHO. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU9).

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 488...

DISCUSSION...SEVERE THUNDERSTORMS ARE ONGOING THIS AFTERNOON IN TWO
CLUSTERS...ONE OVER E-CENTRAL UT AND ANOTHER FROM ERN ID INTO FAR
NERN NV. ACTIVITY WILL LIKELY CONTINUE FOR SEVERAL HOURS WITH
THREATS OF LARGE HAIL AND ISOLATED DAMAGING WINDS GIVEN MODEST
INSTABILITY AND EFFECTIVE SHEAR FROM 40-50 KT. EXPECT STORMS MOVING
ENEWD ALONG WRN BAND WILL PERSIST THE LONGEST THIS EVENING INTO ERN
ID/NRN UT...WITH STRONGER STORMS EVOLVING INTO SUPERCELLS AND
ORGANIZED LINES/CLUSTERS.

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 400. MEAN STORM
MOTION VECTOR 23020.

...EVANS

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