

540 

WWUS20 KWNS 142012

SEL0

SPC WW 142012

KSZ000-NEZ000-150400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 390

NWS STORM PREDICTION CENTER NORMAN OK

315 PM CDT THU JUN 14 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST AND NORTH-CENTRAL KANSAS

       SOUTH-CENTRAL AND SOUTHWEST NEBRASKA



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 315 PM UNTIL

1100 PM CDT.



HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES EAST AND WEST OF A LINE FROM 80 MILES SOUTHWEST OF

HILL CITY KANSAS TO 35 MILES NORTH NORTHEAST OF GRAND ISLAND

NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...CONTINUE...WW 389...



DISCUSSION...TSTMS ARE EXPECTED TO DEVELOP WITHIN THE NEXT HOUR OR

SO ALONG THE DECELERATING COLD FRONT WHERE AIR MASS HAS BECOME

MODERATE-STRONGLY UNSTABLE WITH MLCAPE OF 2000-4000+ J/KG.  DESPITE

THE MARGINAL VERTICAL SHEAR...THE DEGREE OF INSTABILITY WILL PROMOTE

INTENSE UPDRAFTS CAPABLE OF LARGE HAIL AND DAMAGING WIND GUSTS.



AVIATION...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 27020.





...MEAD

