WATCHES: Severe Thunderstorm Watch Number 630

WWUS20 KWNS 071936
SEL0
SPC WW 071936
ARZ000-ILZ000-KSZ000-MOZ000-OKZ000-080300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 630
NWS STORM PREDICTION CENTER NORMAN OK
240 PM CDT FRI SEP 7 2012

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

EXTREME NORTHWEST ARKANSAS
PARTS OF SOUTHWEST ILLINOIS
SOUTHEAST KANSAS
MUCH OF CENTRAL AND SOUTHERN MISSOURI
NORTHEAST OKLAHOMA

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 240 PM UNTIL
1000 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 75
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES SOUTH
SOUTHWEST OF CHANUTE KANSAS TO 15 MILES EAST OF SCOTT AFB
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 628...WW 629...

DISCUSSION...STORMS WILL LIKELY INCREASE IN COVERAGE/INTENSITY BOTH
ALONG AND AHEAD OF A COLD FRONT IN THE NEXT FEW HOURS ACROSS SE
KS/NE OK/MO. INCREASING DEEP-LAYER VERTICAL SHEAR WILL THE APPROACH
OF A MIDLEVEL TROUGH OVER KS...AS WELL AS A DEEP SURFACE-BASED MIXED
LAYER AND MODERATE INSTABILITY...WILL SUPPORT AN INCREASING RISK FOR
DAMAGING WINDS AND LARGE HAIL THROUGH THE AFTERNOON/EVENING.

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 550. MEAN STORM
MOTION VECTOR 29035.


...THOMPSON

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