

152 

WWUS20 KWNS 080231

SEL3

SPC WW 080231

OKZ000-TXZ000-081000-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 873

NWS STORM PREDICTION CENTER NORMAN OK

825 PM CST MON NOV 7 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHWEST THROUGH CENTRAL TO NORTHEAST OKLAHOMA

       NORTHWEST TEXAS



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 825 PM UNTIL

400 AM CST.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 75 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 25 MILES NORTHEAST OF

BARTLESVILLE OKLAHOMA TO 70 MILES SOUTHWEST OF WICHITA FALLS

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 870...WW 871...WW 872...



DISCUSSION...EXISTING SUPERCELLS HAVE EVOLVED INTO AN EXTENSIVE

BROKEN SW-NE SQLN...WITH EMBEDDED LEWPS AND ROTATING STRUCTURES.

BOTH LOW LVL AND DEEP SHEAR EXPECTED TO STRENGTHEN SOMEWHAT LATER

TNGT AS NM UPR VORT AND ASSOCIATED SPEED MAX CONTINUE NEWD.

CONTINUED INFLOW OF LOW LVL MOISTURE...COUPLED WITH STRENGTHENING

SHEAR/ASCENT...MAY SUFFICIENTLY OFFSET DIURNAL INCREASE IN SBCIN TO

MAINTAIN A THREAT FOR ISOLD TORNADOES WITH THE STORMS...IN ADDITION

TO SWATHS OF DMGG WIND AND SVR HAIL.  SETUP ALSO MAY SUPPORT A FEW

CORRIDORS WITH PROLONGED HEAVY RAIN.



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

SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 23035.





...CORFIDI

