

612 

WWUS20 KWNS 190403

SEL7

SPC WW 190403

OKZ000-190800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 177

NWS STORM PREDICTION CENTER NORMAN OK

1100 PM CDT SAT MAY 18 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  CENTRAL AND EASTERN OKLAHOMA



* EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 1100 PM

  UNTIL 300 AM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTHEAST OF

BARTLESVILLE OKLAHOMA TO 30 MILES WEST SOUTHWEST OF ARDMORE

OKLAHOMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

TORNADO WATCH NUMBER 171. WATCH NUMBER 171 WILL NOT BE IN EFFECT

AFTER 1100 PM CDT. CONTINUE...WW 170...WW 172...WW 173...WW

174...WW 175...WW 176...



DISCUSSION...LOOSELY-ORGANIZED SQLN/MCS EXPECTED TO CONTINUE

GENERALLY ENE ACROSS CNTRL OK THROUGH EARLY SUN...WITH ADDITIONAL

DEVELOPMENT POSSIBLY CONTINUING ATOP COLD POOL IN ITS WAKE. WHILE

SLOWLY-INCREASING CIN SHOULD MITIGATE UPDRAFT STRENGTH WITH

TIME...GIVEN DEEP EML SAMPLED BY OUN 00Z RAOB...AND VERY

MOIST...40-50 KT SSWLY 1 KM FLOW...SETUP MAY YIELD ADDITIONAL STRONG

TO DMGG WIND GUSTS...ESPECIALLY ON ERN/SRN EDGE OF ASSOCIATED

LARGE-SCALE GUST FRONT.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION

VECTOR 24030.





...CORFIDI

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