WATCHES: Severe Thunderstorm Watch Number 350

WWUS20 KWNS 081826
SEL0
SPC WW 081826
ILZ000-WIZ000-LMZ000-090000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 350
NWS STORM PREDICTION CENTER NORMAN OK
125 PM CDT MON JUN 8 2009

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

NORTHEAST ILLINOIS
SOUTHEAST WISCONSIN
LAKE MICHIGAN

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 125 PM UNTIL 700
PM CDT.

HAIL TO 1.5 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 55
STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH OF
MILWAUKEE WISCONSIN TO 10 MILES SOUTH OF MARSEILLES ILLINOIS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU0).

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...SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP IN
ADVANCE OF A MID LEVEL TROUGH MOVING ENEWD FROM IA...ALONG AND S OF
THE WARM FRONT FROM SRN WI INTO NRN IL...AND IN ADVANCE OF A
PRE-FRONTAL TROUGH AND THE SURFACE LOW MOVING EWD FROM IA INTO SW
WI/NW IL. MODERATE INSTABILITY IS EXPECTED IN THE WARM SECTOR TO
THE N OF THE DEBRIS CLOUDINESS OVER CENTRAL IL...AND PRIMARILY
UNIDIRECTIONAL DEEP LAYER WIND PROFILES WILL FAVOR SHORT LINE
SEGMENTS AND SUPERCELLS CAPABLE OF PRODUCING DAMAGING WINDS AND
LARGE HAIL. AN ISOLATED TORNADO CANNOT BE RULED OUT /ESPECIALLY
WITH STORMS INTERACTING WITH THE WARM FRONT/...BUT GENERALLY VEERED
LOW-LEVEL WINDS IN THE WARM SECTOR AND MINIMAL INSTABILITY N OF THE
WARM FRONT WILL LIMIT THIS OVERALL THREAT.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 27040.

...THOMPSON

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