URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 442
NWS STORM PREDICTION CENTER NORMAN OK
345 PM CDT FRI MAY 30 2003
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
NORTHERN AND CENTRAL ILLINOIS
SOUTHERN WISCONSIN
EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 345 PM UNTIL 900
PM CDT.
TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS ALONG AND 60 STATUTE MILES EAST AND WEST
OF A LINE FROM 30 MILES NORTH NORTHEAST OF MADISON WISCONSIN TO 35
MILES SOUTH SOUTHWEST OF PEORIA ILLINOIS.
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 441...
DISCUSSION...VIGOROUS UPPER TROUGH AND ASSOCIATED STRONG SURFACE LOW
DROPPING SEWD ACROSS UPR MS VALLEY . AIRMASS AHEAD OF SYSTEM IS
RAPIDLY DESTABILIZING WITH A WELL DEFINED DRY LINE/COLD FRONT MOVING
EWD ACROSS ERN IA. SEVERE THUNDERSTORMS EXPECTED TO DEVELOP RAPIDLY
ALONG DRY LINE/COLD FRONT WITH FAVORABLE SHEAR PROFILES FOR TORNADIC
SUPERCELLS.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 28040.
.........................................................................................................
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 441
NWS STORM PREDICTION CENTER NORMAN OK
1235 PM MDT FRI MAY 30 2003
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHERN AND CENTRAL IDAHO
SOUTHWESTERN MONTANA
EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 1235 PM UNTIL 700
PM MDT.
HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 100 STATUTE MILES
EAST AND WEST OF A LINE FROM 45 MILES SOUTHWEST OF TWIN FALLS
IDAHO TO 35 MILES NORTH NORTHEAST OF BUTTE MONTANA.
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...THIS SEVERE THUNDERSTORM WATCH REPLACES
SEVERE THUNDERSTORM WATCH NUMBER 440. WATCH NUMBER 440 WILL NOT BE
IN EFFECT AFTER 1235 PM MDT.
DISCUSSION...VIGOROUS UPPER TROUGH ENTERING SWRN ID WITH AIRMASS
DOWNSTREAM INTO SWRN MT/ERN ID NOW MODERATELY UNSTABLE WITH ONLY A
WEAK CAP. THUNDERSTORMS WILL INCREASE RAPIDLY NEWD ACROSS SRN ID
INTO SWRN MT WITH 50KT OF DEEP LAYER SHEAR SUPPORTING ISOLATED
SUPERCELLS. PRIMARY THREAT WILL BE LARGE HAIL AND DAMAGING WINDS
PARTICULARLY ASSOCIATED WITH ANY SUPERCELLS THAT DEVELOP.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 23035.
