

699 

WWUS20 KWNS 031710

SEL3

SPC WW 031710

TXZ000-040100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 133

NWS STORM PREDICTION CENTER NORMAN OK

1210 PM CDT TUE APR 3 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTH-CENTRAL TEXAS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1210 PM UNTIL

800 PM CDT.



TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE

MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH NORTHEAST OF

DALLAS TEXAS TO 15 MILES EAST SOUTHEAST OF TEMPLE TEXAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU3).



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 132...



DISCUSSION...LATEST SURFACE OBSERVATIONS INDICATE OUTFLOW BOUNDARY

BECOMING BETTER DEFINED ALONG OR JUST N OF THE I-20 CORRIDOR.  AIR

MASS ALONG AND S OF THIS BOUNDARY HAS WARMED INTO THE MID-UPPER

70S...AND WHEN COUPLED WITH DEWPOINTS OF 67-70 F...ENVIRONMENT IS

ALREADY MODERATELY UNSTABLE WITH MLCAPE OF 2000-2500 J/KG.

MOREOVER...CURRENT FWD VAD IS INDICATING 0-1 KM SHEAR OF AROUND 20

KT...AND 0-6 KM SHEAR OF 60 KT...WHICH WILL SUPPORT DEEP UPDRAFT

ROTATION.  CURRENT THINKING IS THAT TORNADO THREAT WILL INCREASE

THIS AFTERNOON WITH MATURE STORMS CROSSING THE OUTFLOW BOUNDARY

WHERE LOW-LEVEL SHEAR/VORTICITY IS ENHANCED.  OTHERWISE...EXPECT THE

MOST INTENSE STORMS TO BE CAPABLE OF VERY LARGE HAIL.



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

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 22025.





...MEAD

