WATCHES: Tornado Watch Number 171

WWUS20 KWNS 182025
SEL1
SPC WW 182025
OKZ000-TXZ000-190400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 171
NWS STORM PREDICTION CENTER NORMAN OK
320 PM CDT SAT MAY 18 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF
WESTERN AND CENTRAL OKLAHOMA
NORTHWEST TEXAS

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

* PRIMARY THREATS INCLUDE...
SEVERAL TORNADOES POSSIBLE
SEVERAL LARGE HAIL EVENTS LIKELY WITH A FEW VERY LARGE HAIL
EVENTS TO 3 INCHES IN DIAMETER POSSIBLE
SEVERAL DAMAGING WIND GUSTS TO 70 MPH LIKELY

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES EAST NORTHEAST OF
ALVA OKLAHOMA TO 30 MILES SOUTH SOUTHEAST OF ABILENE TEXAS. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU1).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 170...

DISCUSSION...SEVERE STORMS ARE EXPECTED TO INITIATE NEAR THE DRYLINE
IN THE VICINITY OF THE WESTERN OKLAHOMA/TEXAS PANHANDLE BORDER
AREA... SOUTHWARD ACROSS PARTS OF NORTHWEST TEXAS...TOWARD THE
EDWARDS PLATEAU...DURING THE NEXT FEW HOURS AS INHIBITION WEAKENS IN
PEAK AFTERNOON HEATING. DISCRETE SUPERCELLS WILL POSE A RISK FOR
VERY LARGE HAIL AND A FEW TORNADOES...BEFORE ACTIVITY GROWS UPSCALE
THIS EVENING...WITH DAMAGING WIND POTENTIAL PERHAPS BECOMING MORE
PROMINENT. AS LOW-LEVEL HODOGRAPHS BECOME CLOCKWISE CURVED AND
QUITE LARGE THIS EVENING...AND BOUNDARY LAYER RELATIVE HUMIDITY
INCREASES WITH DIURNAL COOLING...A WINDOW OF OPPORTUNITY MAY EXIST
FOR A STRONG TORNADO OR TWO...BEFORE CONVECTION CONSOLIDATES INTO
ORGANIZED CLUSTERS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 25030.


...KERR

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