

581 

WWUS20 KWNS 191940

SEL5

SPC WW 191940

TXZ000-200300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 85

NWS STORM PREDICTION CENTER NORMAN OK

240 PM CDT MON MAR 19 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL AND NORTH CENTRAL TEXAS



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 240 PM UNTIL

1000 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 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 10 MILES EAST NORTHEAST OF

SHERMAN TEXAS TO 85 MILES SOUTH SOUTHWEST OF JUNCTION 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.



DISCUSSION...CONVECTION HAS SHOWN A TENDENCY TO INTENSIFY ALONG AN

OUTFLOW BOUNDARY THAT IS DRIFTING EWD ACROSS CENTRAL/N CENTRAL

TX...PARTIALLY AIDED BY THE GLANCING INFLUENCE OF AN EMBEDDED SPEED

MAX EJECTING NEWD OVER W TX.  MODERATE-STRONG INSTABILITY IS PRESENT

E OF THE BOUNDARY...AND VERTICAL SHEAR IS FAVORABLE FOR SUPERCELLS

AS WELL AS BOWING SEGMENTS.  AS A RESULT...THE RISK FOR LARGE HAIL

AND DAMAGING WINDS SHOULD INCREASE THIS AFTERNOON AND PERSIST INTO

THIS EVENING.  ADDITIONALLY...ANY OF THE STORMS ROOTED ALONG THE

IMMEDIATE SURFACE BOUNDARY WILL HAVE THE POTENTIAL TO PRODUCE A FEW

TORNADOES.



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

550. MEAN STORM MOTION VECTOR 23045.





...THOMPSON

