Wednesday, July 25, 2012

WATCHES: Severe Thunderstorm Watch Number 519

WWUS20 KWNS 252214
SEL9
SPC WW 252214
IAZ000-MNZ000-WIZ000-260600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 519
NWS STORM PREDICTION CENTER NORMAN OK
515 PM CDT WED JUL 25 2012

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

NORTHERN IOWA
SOUTHERN MINNESOTA
SOUTHWEST WISCONSIN

EFFECTIVE THIS WEDNESDAY AFTERNOON AND THURSDAY MORNING FROM 515
PM UNTIL 100 AM CDT.

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 85
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES WEST
SOUTHWEST OF DENISON IOWA TO 30 MILES NORTH NORTHWEST OF LA
CROSSE WISCONSIN. 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 518...

DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE ALONG THE
COLD FRONT THIS EVENING AS REGION IS GLANCED BY A WEAK MIDLEVEL
IMPULSE MOVING INTO CNTRL/SRN MN. THERMODYNAMIC ENVIRONMENT IS
CHARACTERIZED BY A HOT...MOIST BOUNDARY LAYER WITH MLCAPE OF
2500-3500 J/KG. WHEN COUPLED WITH MODEST DEEP...WLY SHEAR...SETUP
WILL FAVOR MULTICELLS AND LINE SEGMENTS CAPABLE OF DAMAGING WINDS
AND LARGE HAIL.

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 500. MEAN STORM
MOTION VECTOR 28020.


...MEAD

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