WATCHES: Severe Thunderstorm Watch Number 64

WWUS20 KWNS 292102
SEL4
SPC WW 292102
OKZ000-TXZ000-300400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 64
NWS STORM PREDICTION CENTER NORMAN OK
400 PM CDT FRI MAR 29 2013

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

WESTERN OKLAHOMA
WESTERN AND NORTHWEST TEXAS

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 400 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 65 MILES NORTH OF
CLINTON OKLAHOMA TO 50 MILES SOUTHEAST OF BIG SPRING TEXAS. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU4).

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.

DISCUSSION...TSTMS EXPECTED TO FORM IN THE NEXT HOUR OR SO OVER
PARTS OF THE TX S PLNS...THE TX LOW ROLLING PLNS...AND NW TX AS
ASCENT ASSOCIATED WITH NM UPR IMPULSE CONTINUES ESEWD. SOME STORMS
MAY ARISE WITHIN EXISTING ACCAS/WAA FIELD DOWNSTREAM FROM NM
SYSTEM...WHILE OTHERS ARISE ALONG DIFFUSE DRY LINE/LEE TROUGH
SEGMENTS NOW EDGING E TOWARD THE LBB AREA. FARTHER NE...OTHER STORMS
MAY FORM ALONG DIFFUSE FRONT EXTENDING ENE FROM THE SRN TX PANHANDLE
INTO NW OK.
WHILE WNWLY DEEP SHEAR WILL REMAIN FAIRLY MODEST /AROUND 35
KTS/...UNIDIRECTIONAL CLOUD-LAYER FLOW AND STEEP MID LVL LAPSE RATES
SHOULD PROMOTE HAIL PRODUCTION GIVEN PERSISTENT LOW-LVL MOISTURE
INFLOW. AND...GIVEN EXPECTED CONCENTRATION OF
CONVECTION...CONSOLIDATION OF STORM COLD POOLS MAY SUPPORT EVOLUTION
INTO ONE OR TWO MCSS WITH A RISK FOR LOCALLY DMGG WIND/HAIL INTO
TNGT.

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 450. MEAN STORM
MOTION VECTOR 29020.


...CORFIDI

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