Severe Thunderstorm Watch # 60

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 60
NWS STORM PREDICTION CENTER NORMAN OK
150 AM CST SAT MAR 11 2006

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

NORTHEASTERN ARKANSAS
SOUTHERN ILLINOIS
WESTERN KENTUCKY
SOUTHEASTERN MISSOURI
FAR NORTHWESTERN TENNESSEE

EFFECTIVE THIS SATURDAY MORNING FROM 150 AM UNTIL 800 AM 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 APPROXIMATELY ALONG AND 85
STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES SOUTHWEST OF
JONESBORO ARKANSAS TO 25 MILES WEST NORTHWEST OF MOUNT VERNON
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.

OTHER WATCH INFORMATION...CONTINUE...WW 58...WW 59...

DISCUSSION...ELEVATED THUNDERSTORMS WILL CONTINUE
DEVELOPING/INTENSIFYING NEWD ACROSS WW OVERNIGHT. ACTIVITY WILL BE
ENHANCED BY ASCENT ASSOCIATED WITH FAST MOVING SHORTWAVE TROUGH NOW
APPROACHING THE REGION. SLY LLJ ACCOMPANYING THIS SYSTEM WILL
SUSTAIN FAVORABLE LOW LEVEL WAA/LIFT AND INCREASE INSTABILITY AS H85
DEW POINTS INCREASE ACROSS THE MID SOUTH/LOWER OH RIVER VALLEY.
STEEP LAPSE RATES AND SUFFICIENT CLOUD-LAYER SHEAR FOR SUPERCELLS
WILL ENHANCE THE THREAT OF LARGE HAIL WITH STRONGER CORES.

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 400. MEAN STORM
MOTION VECTOR 24030.


...EVANS