WW Issued for Mid-Mississippi Valley
Posted: Mon Mar 01, 2004 12:33 pm
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 15
NWS STORM PREDICTION CENTER NORMAN OK
1130 AM CST MON MAR 1 2004
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
EASTERN IOWA
NORTHERN ILLINOIS
NORTHWEST CORNER INDIANA
SOUTHERN WISCONSIN
LAKE MICHIGAN
EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 1130 AM UNTIL 500
PM CST.
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 ALONG AND 95 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 10 MILES WEST SOUTHWEST OF CEDAR
RAPIDS IOWA TO 5 MILES SOUTHEAST OF MEIGS FIELD ILLINOIS.
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.
DISCUSSION...AHEAD OF THE STRONG LOW MOVING EWD FROM WRN IA HEATING
HAS RESULTED IN THE AIR MASS BECOMING SUFFICIENTLY UNSTABLE TO
SUPPORT DEVELOPMENT OF STRONG/SEVERE THUNDERSTORMS ACROSS WATCH
AREA. WITH STEEP LAPSE RATES IN PLACE AND LOW FREEZING LEVELS
COUPLED WITH MDT/STG DEEP LAYER SHEAR...STORMS WILL QUICKLY DEVELOP
HAIL POTENTIAL AS THEY SPREAD EWD. WITH FAVORABLE VEERING SHEAR
PROFILES...POTENTIAL FOR ISOLATED SUPERCELLS WILL IMPROVE DURING
AFTERNOON INCREASING THREAT FOR DAMAGING WINDS.
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 450. MEAN STORM
MOTION VECTOR 24035.
...HALES
;431,0915 431,0873 402,0873 402,0915;
SEVERE THUNDERSTORM WATCH NUMBER 15
NWS STORM PREDICTION CENTER NORMAN OK
1130 AM CST MON MAR 1 2004
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
EASTERN IOWA
NORTHERN ILLINOIS
NORTHWEST CORNER INDIANA
SOUTHERN WISCONSIN
LAKE MICHIGAN
EFFECTIVE THIS MONDAY MORNING AND AFTERNOON FROM 1130 AM UNTIL 500
PM CST.
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 ALONG AND 95 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 10 MILES WEST SOUTHWEST OF CEDAR
RAPIDS IOWA TO 5 MILES SOUTHEAST OF MEIGS FIELD ILLINOIS.
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.
DISCUSSION...AHEAD OF THE STRONG LOW MOVING EWD FROM WRN IA HEATING
HAS RESULTED IN THE AIR MASS BECOMING SUFFICIENTLY UNSTABLE TO
SUPPORT DEVELOPMENT OF STRONG/SEVERE THUNDERSTORMS ACROSS WATCH
AREA. WITH STEEP LAPSE RATES IN PLACE AND LOW FREEZING LEVELS
COUPLED WITH MDT/STG DEEP LAYER SHEAR...STORMS WILL QUICKLY DEVELOP
HAIL POTENTIAL AS THEY SPREAD EWD. WITH FAVORABLE VEERING SHEAR
PROFILES...POTENTIAL FOR ISOLATED SUPERCELLS WILL IMPROVE DURING
AFTERNOON INCREASING THREAT FOR DAMAGING WINDS.
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 450. MEAN STORM
MOTION VECTOR 24035.
...HALES
;431,0915 431,0873 402,0873 402,0915;
