

967 

WWUS20 KWNS 200148

SEL0

SPC WW 200148

KSZ000-200900-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 310

NWS STORM PREDICTION CENTER NORMAN OK

850 PM CDT THU MAY 19 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL KANSAS



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 850 PM

UNTIL 400 AM CDT.



TORNADOES...HAIL TO 2 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 70 STATUTE

MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHWEST OF

CONCORDIA KANSAS TO 30 MILES SOUTHWEST OF MEDICINE LODGE KANSAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 309. WATCH NUMBER 309 WILL NOT BE IN EFFECT AFTER

850 PM CDT.



DISCUSSION...THUNDERSTORMS ARE INCREASING IN COVERAGE/INTENSITY

ALONG THE DRYLINE IN SW/CENTRAL KS.  EARLIER CONVECTION PRODUCED

RAIN-COOLED OUTFLOW THAT SOMEWHAT STABILIZED THE BOUNDARY

LAYER...BUT NOT TO THE EXTENT THE SURFACE-BASED INSTABILITY WAS

REMOVED.  THEREFORE...THE PERSISTENCE OF STEEP MIDLEVEL LAPSE RATES

ABOVE REMAINING BOUNDARY LAYER DEWPOINTS IN THE 60S WILL SUPPORT

MODERATE INSTABILITY...IN A VERTICAL SHEAR ENVIRONMENT THAT IS

FAVORABLE FOR SUPERCELLS.  LARGE HAIL WILL BE THE PRIMARY THREAT N

OF THE WARM FRONT ALONG I-70...WHILE DAMAGING WINDS AND A COUPLE OF

TORNADOES WILL ALSO BE POSSIBLE FARTHER S IN KS AS THE LLJ

STRENGTHENS THIS EVENING AND SURFACE-BASED INSTABILITY PERSISTS TO

THE N/NW OF THE DEEPER/STRONGER COLD POOL ACROSS WRN OK.



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

SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE

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

500. MEAN STORM MOTION VECTOR 24035.





...THOMPSON

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