WATCHES: Tornado Watch Number 332

WWUS20 KWNS 052053
SEL2
SPC WW 052053
COZ000-KSZ000-NEZ000-WYZ000-060400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 332
NWS STORM PREDICTION CENTER NORMAN OK
250 PM MDT FRI JUN 5 2009

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

NORTHEAST COLORADO
EXTREME NORTHWEST KANSAS
WESTERN NEBRASKA
SOUTHEAST WYOMING

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 250 PM UNTIL
1000 PM MDT.

TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF TORRINGTON
WYOMING TO 55 MILES SOUTH SOUTHEAST OF AKRON COLORADO. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU2).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

DISCUSSION...DESPITE WIDESPREAD HIGH CLOUDS...A FEW THUNDERSTORMS
HAVE DEVELOPED RECENTLY OVER THE LARAMIE RANGE IN SE WY. CONTINUED
UPSLOPE FLOW OF BOUNDARY LAYER DEWPOINTS IN THE LOW-MID 50S AND SLOW
SURFACE HEATING WILL CONTRIBUTE TO INCREASING CAPE...WEAKENING
CONVECTIVE INHIBITION...AND ADDITIONAL THUNDERSTORM DEVELOPMENT FROM
WY INTO CO. GIVEN THE MODERATE INSTABILITY /MLCAPE NEAR 2000 J/KG
AND MID LEVEL LAPSE RATES NEAR 8 C/KM/ AND EFFECTIVE BULK SHEAR OF
45-55 KT...ENVIRONMENT WILL SUPPORT SUPERCELLS CAPABLE OF PRODUCING
ISOLATED VERY LARGE HAIL AND DAMAGING WINDS. LOW-LEVEL SHEAR
INCREASES WITH EWD EXTENT AND WITH TIME THIS EVENING AS THE LLJ
STRENGTHENS...AND THIS INCREASING SHEAR WILL LIKEWISE SUPPORT AN
INCREASING THREAT FOR A FEW TORNADIC SUPERCELLS THIS EVENING.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 27025.

...THOMPSON

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