

785 

WWUS20 KWNS 141932

SEL5

SPC WW 141932

OKZ000-TXZ000-150300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 135

NWS STORM PREDICTION CENTER NORMAN OK

230 PM CDT THU APR 14 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       MUCH OF THE EASTERN HALF OF OKLAHOMA

       PARTS OF NORTH CENTRAL/NORTHEASTERN TEXAS



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 230 PM UNTIL

1000 PM CDT.



...THIS IS A PARTICULARLY DANGEROUS SITUATION...



DESTRUCTIVE TORNADOES...LARGE HAIL TO 4 INCHES IN DIAMETER...

THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE

POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE

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

BARTLESVILLE OKLAHOMA TO 40 MILES SOUTH SOUTHEAST OF SHERMAN

TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 134...



DISCUSSION...DRY LINE LOCATED VICINITY I-35 CORRIDOR WITH THE AIR

MASS NOW VERY UNSTABLE EWD ACROSS OK.  WITH LITTLE REMAINING

CINH...SEVERE THUNDERSTORMS WILL DEVELOP RAPIDLY OFF THE DRY LINE

AND MOVE THRU A VERY FAVORABLE ENVIRONMENT FOR SUPERCELLS. INITIALLY

VERY LARGE HAIL WILL BE THE RISK GIVEN THE STEEP LAPSE RATES AND

DEEP LAYER SHEAR.  AS THE STRONG UPPER JET MAX APPROACHES TORNADIC

SUPERCELLS WILL BECOME MORE LIKELY BY LATER  THIS AFTERNOON/EVENING

WITH POTENTIAL FOR LONG LIVED SUPERCELLS AND STRONG TORNADOES.  DRY

LINE VERY LIKELY WILL MOVE LITTLE EWD FROM CURRENT POSITION WITH

POTENTIAL FOR SEVERE STORMS DEVELOPING ON W EDGE OF WATCH INTO THE

EVENING HOURS.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 24035.





...HALES

