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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 210

NWS STORM PREDICTION CENTER NORMAN OK

340 PM CDT MON APR 30 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       FAR SOUTHEAST COLORADO

       SOUTHWEST KANSAS

       OKLAHOMA PANHANDLE

       WESTERN TEXAS



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 340 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 80

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

NORTHEAST OF ELKHART KANSAS TO 50 MILES SOUTH SOUTHEAST OF

LUBBOCK TEXAS.  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 208...WW 209...



DISCUSSION...TSTMS ARE IN THE PROCESS OF DEVELOPING THIS AFTERNOON

ALONG DRYLINE WHICH HAS MIXED TO JUST E OF THE TX-NM BORDER.

ADDITIONAL STORMS MAY DEVELOP ALONG AN OUTFLOW BOUNDARY S OF

LBB...AS WELL AS ALONG A SECONDARY BAROCLINIC ZONE OVER SWRN KS INTO

SERN CO.  WARM SECTOR AIR MASS ACROSS THE WATCH AREA IS

CHARACTERIZED BY STEEP LAPSE RATES AND BOUNDARY LAYER DEWPOINTS OF

55-60 F WITH MLCAPE VALUES RANGING FROM 1000-1500 J/KG NORTH TO

2500-3500 J/KG SOUTH.  WHEN COUPLED WITH A VERTICALLY VEERING WIND

PROFILE AND 40-45 KT OF EFFECTIVE BULK SHEAR...ENVIRONMENT IS QUITE

SUPPORTIVE OF SUPERCELLS CAPABLE OF MAINLY LARGE HAIL.  WHILE A

TORNADO IS POSSIBLE...THE GENERALLY WEAK LOW-LEVEL SHEAR AND GROWING

T-TD SPREADS WILL PRECLUDE A MORE ROBUST THREAT.



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 500. MEAN STORM

MOTION VECTOR 27020.





...MEAD

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