WATCHES: Severe Thunderstorm Watch Number 377

WWUS20 KWNS 101930
SEL7
SPC WW 101930
IAZ000-MNZ000-NEZ000-SDZ000-110300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 377
NWS STORM PREDICTION CENTER NORMAN OK
230 PM CDT SUN JUN 10 2007

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

PARTS OF NORTHWEST IOWA
PARTS OF SOUTHWEST MINNESOTA
PARTS OF NORTHERN NEBRASKA
LARGE PART OF CENTRAL AND EASTERN SOUTH DAKOTA

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 230 PM UNTIL
1000 PM CDT.

HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
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 35 MILES SOUTHWEST
OF PHILIP SOUTH DAKOTA TO 40 MILES SOUTHEAST OF REDWOOD FALLS
MINNESOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).

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 376...

DISCUSSION...AIR MASS HAS BECOME VERY TO EXTREMELY UNSTABLE ACROSS
CENTRAL AND EASTERN SD. WITH STEEP LAPSE RATES AND 25-30KT OF
SHEAR...THUNDERSTORMS EXPECTED TO INCREASE IN BOTH INTENSITY AND
NUMBER ACROSS WATCH AREA THRU THE AFTERNOON. PRIMARY THREAT WILL
BE LARGE HAIL AND DAMAGING WINDS. SUPERCELLS ARE POSSIBLE GIVEN THE
INSTABILITY WITH AN ENHANCED SEVERE THREAT.

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 550. MEAN STORM
MOTION VECTOR 24025.

..HALES

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