Tornado Watch #63

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 63
NWS STORM PREDICTION CENTER NORMAN OK
220 PM CST SAT MAR 11 2006

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

SOUTHEASTERN IOWA
NORTHERN AND CENTRAL ILLINOIS
EASTERN MISSOURI

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 220 PM UNTIL
1000 PM CST.

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 100 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES SOUTHEAST OF VICHY
MISSOURI TO 30 MILES NORTHWEST OF MARSEILLES ILLINOIS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU3).

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 62...

DISCUSSION...THUNDERSTORMS WILL DEVELOP RAPIDLY ALONG AND AHEAD OF
COLD FRONT MOVING EWD ACROSS ERN IA/NRN MO AS AIR MASS NOW
MODERATELY UNSTABLE AND WEAKLY CAPPED. STRONG DEEP LAYER SHEAR TO
60KT AND BACKED LOW LEVEL FLOW VICINITY WARM FRONT ACROSS CENTRAL IL
WILL ENHANCE SUPERCELL DEVELOPMENT AS STORMS MOVE E. IN ADDITION TO
VERY LARGE HAIL...A FEW TORNADOES ARE ALSO POSSIBLE.

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 500.
MEAN STORM MOTION VECTOR 24035.


...HALES