

964 

WWUS20 KWNS 121848

SEL7

SPC WW 121848

COZ000-KSZ000-NEZ000-130200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 157

NWS STORM PREDICTION CENTER NORMAN OK

1250 PM MDT THU APR 12 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EASTERN COLORADO

       WESTERN KANSAS

       SOUTHWEST NEBRASKA



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 1250 PM UNTIL

800 PM MDT.



TORNADOES...HAIL TO 3 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 50 MILES NORTHWEST OF IMPERIAL

NEBRASKA TO 45 MILES EAST SOUTHEAST OF LAMAR COLORADO.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU7).



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...THUNDERSTORMS ARE EXPECTED TO INTENSIFY THIS AFTERNOON

OVER EASTERN CO AND TRACK EASTWARD INTO WESTERN KS/SOUTHWEST NEB.

THIS REGION IS WITHIN A CORRIDOR OF MODERATE CAPE AND STEEP LAPSE

RATES...ALONG WITH FAVORABLE LOW LEVEL AND DEEP LAYER SHEAR.  STORMS

ARE FORECAST TO QUICKLY BECOME SUPERCELLULAR WITH A RISK OF VERY

LARGE HAIL AND A FEW TORNADOES.  INCREASING WIND FIELDS THROUGH THE

LATE AFTERNOON AND EVENING WOULD SUPPORT A RISK OF STRONG TORNADOES.



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

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

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

450. MEAN STORM MOTION VECTOR 27030.





...HART

