WW 234 TORNADO IA IL KS MO 040010Z – 040600Z
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 234
NWS STORM PREDICTION CENTER NORMAN OK
710 PM CDT THU MAY 3 2012
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHERN IOWA
EXTREME WEST CENTRAL ILLINOIS
EXTREME NORTHEAST KANSAS
NORTHERN MISSOURI
EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 710 PM
UNTIL 100 AM CDT.
TORNADOES...HAIL TO 3 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 65 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 50 MILES NORTH NORTHWEST OF
SAINT JOSEPH MISSOURI TO 35 MILES SOUTHEAST OF BURLINGTON IOWA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU4).
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.
OTHER WATCH INFORMATION...CONTINUE...WW 231...WW 232...WW 233...
DISCUSSION...THUNDERSTORMS ARE EXPECTED TO INCREASE IN
COVERAGE/INTENSITY THIS EVENING THROUGH EARLY TONIGHT ACROSS NRN
MO/SRN IA AS LOW-LEVEL WAA INCREASES ALONG A DIFFUSE/REMNANT OUTFLOW
BOUNDARY THAT IS DRIFTING NWD INTO IA. 00Z TOP SOUNDING IS
REPRESENTATIVE OF THE STRONG INSTABILITY PRESENT ACROSS THE SRN/WRN
PORTIONS OF THE WATCH AREA...AND VERTICAL SHEAR IS AT LEAST
MARGINALLY FAVORABLE FOR SUPERCELLS WITH SOME RISK FOR A TORNADO OR
TWO. OTHERWISE...VERY LARGE HAIL WILL BE POSSIBLE WITH THE MORE
DISCRETE STORMS IN THE NEXT FEW HOURS...WHILE THE RISK FOR DAMAGING
WINDS WILL INCREASE AS STORMS MERGE AND GROW UPSCALE INTO
BANDS/CLUSTERS TONIGHT.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 27025.
...THOMPSON
via SPC Forecast Products http://www.spc.noaa.gov/products/watch/ww0234.html
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