

982 

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

