WATCHES: Severe Thunderstorm Watch Number 853

WWUS20 KWNS 182107
SEL3
SPC WW 182107
TXZ000-190400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 853
NWS STORM PREDICTION CENTER NORMAN OK
405 PM CDT SUN SEP 18 2011

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

SOUTHWEST THROUGH NORTH CENTRAL TEXAS

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 405 PM UNTIL
1100 PM CDT.

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 75
STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES EAST
NORTHEAST OF SHERMAN TEXAS TO 50 MILES WEST SOUTHWEST OF JUNCTION
TEXAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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 852...

DISCUSSION...TSTMS EXPECTED TO INCREASE IN COVERAGE/STRENGTH THROUGH
EARLY EVE IN WW AREA...ESPECIALLY IMMEDIATELY AHEAD OF MAIN NE-SW
WIND SHIFT LINE NOW MOVING SE TOWARD FWD. MORE WDLY SCTD STORMS ARE
EXPECTED SWWD THROUGH WRN PARTS OF THE HILL COUNTRY TO THE BIG BEND
REGION...AND ISOLD STRONG STORMS MAY PERSIST IN AREA NEAR CRS.
WHILE WIND FIELD WILL REMAIN MODEST...DEGREE OF INSTABILITY AND
GLANCING INFLUENCE OK VORT LOBE WILL CREATE ENVIRONMENT FAVORABLE
FOR SUSTAINED STORMS/STORM CLUSTERS WITH SVR HAIL/WIND. ACTIVITY
NEAR FWD MAY CONSOLIDATE INTO AN MCS THAT FORWARD PROPAGATES E OR
SEWD LATER THIS EVE.

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 500. MEAN STORM
MOTION VECTOR 27020.

...CORFIDI

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