WW 653 SEVERE TSTM CO KS NM OK TX 262100Z – 270400Z
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 653
NWS STORM PREDICTION CENTER NORMAN OK
400 PM CDT WED SEP 26 2012
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
FAR SOUTHEAST COLORADO
SOUTHWEST KANSAS
FAR NORTHEAST NEW MEXICO
OKLAHOMA PANHANDLE
TEXAS PANHANDLE
EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 400 PM UNTIL
1100 PM CDT.
HAIL TO 2 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 70
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES SOUTH
SOUTHEAST OF AMARILLO TEXAS TO 45 MILES NORTH OF ELKHART KANSAS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU3).
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 651...WW 652...
DISCUSSION...TSTMS CURRENTLY DEVELOPING ALONG THE RATON MESA ARE
EXPECTED TO INCREASE IN COVERAGE AND INTENSITY AS LOW-LEVEL UPSLOPE
FLOW IS ENHANCED BY THE GLANCING INFLUENCE OF A VORTICITY MAXIMUM
ROTATING AROUND PARENT UPPER LOW. WHILE THE BOUNDARY LAYER IS NOT
OVERLY MOIST THE COMBINATION OF 45-55 F DEWPOINTS AND STEEP LAPSE
RATES ARE SUPPORTING MODEST INSTABILITY. MOREOVER...30-35 KT WLY
MIDLEVEL FLOW OVERLAYS ELY SURFACE WINDS...RESULTING IN 40-45 KT OF
DEEP-LAYER SHEAR WHICH WILL SUPPORT SUPERCELLS CAPABLE OF MAINLY
LARGE HAIL AND DAMAGING WINDS.
AVIATION...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 28025.
...MEAD
via SPC Forecast Products http://www.spc.noaa.gov/products/watch/ww0653.html
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