WATCHES: Severe Thunderstorm Watch Number 851

WWUS20 KWNS 172022
SEL1
SPC WW 172022
OKZ000-TXZ000-180400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 851
NWS STORM PREDICTION CENTER NORMAN OK
320 PM CDT SAT SEP 17 2011

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

WESTERN OKLAHOMA
PARTS OF THE TEXAS SOUTH PLAINS...WESTERN NORTH TEXAS AND FAR
EASTERN PARTS OF THE TEXAS PANHANDLE
EASTERN PARTS OF THE TEXAS PANHANDLE
EASTERN PARTS OF THE TEXAS PANHANDLE

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 320 PM UNTIL
1100 PM CDT.

HAIL TO 1.7 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 70
STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH
NORTHEAST OF CLINTON OKLAHOMA TO 130 MILES SOUTH OF CHILDRESS
TEXAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

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 850...

DISCUSSION...SCTD TSTMS...INCLUDING A FEW SUSTAINED MULTICELLS AND
POSSIBLY A SUPERCELL OR TWO WITH SVR WIND/HAIL...EXPECTED TO FORM
ALONG CONFLUENCE LINES ALONG AND E OF DRY LINE/LEE TROUGH NOW ARCING
THROUGH PARTS OF THE TX PANHANDLE AND W CNTRL TX. WHILE MOST OF THE
ACTIVITY SHOULD BE DIURNALLY-DRIVEN...THE STORMS MAY RECEIVE SOME
ENHANCEMENT FROM CONTINUING RETURN OF RICH LOW LVL MOISTURE AND
EXPECTED STRENGTHENING OF SSWLY LLJ THIS EVE. SOME OF THE STORMS IN
THE NRN PART OF THE WATCH MAY EVOLVE INTO A SMALL MCS TNGT...WITH A
CONTINUING A THREAT FOR ISOLD SVR WIND/HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.7 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 25025.

...CORFIDI

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