

841 

WWUS20 KWNS 140403

SEL3

SPC WW 140403

OKZ000-141100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 403

NWS STORM PREDICTION CENTER NORMAN OK

1100 PM CDT SAT JUN 13 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN OKLAHOMA



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 1100 PM

UNTIL 600 AM CDT.



HAIL TO 1.5 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 55

STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES NORTH

NORTHWEST OF BARTLESVILLE OKLAHOMA TO 30 MILES SOUTHWEST OF DE

QUEEN ARKANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 398...WW 399...WW

401...WW 402...



DISCUSSION...TSTMS EXPECTED TO INCREASE IN COVERAGE/INTENSITY ACROSS

ERN OK...IN RESPONSE TO BOTH /1/ SATURATION FROM ALOFT ABOVE EML

CAP...AND /2/ WAA ALONG W-E 850 MB WARM FRONT OVER NRN OK.  QUALITY

OF MOISTURE AND STEEP LAPSE RATES ALOFT SUGGEST POTENTIAL FOR WET

MICROBURSTS.  IF TRUE SFC-BASED STORMS ARE ABLE TO

DEVELOP...CONTINGENT ON PRESENCE OF LOW LVL ASCENT ALONG OUTFLOW

FROM EXISTING STORMS...POTENTIAL WOULD ALSO EXIST FOR LARGE HAIL AND

PERHAPS A TORNADO.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 26025.





...CORFIDI

