WW 675 SEVERE TSTM KS NE 102135Z – 110500Z
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 675
NWS STORM PREDICTION CENTER NORMAN OK
335 PM CST SAT NOV 10 2012
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
CENTRAL KANSAS
SOUTHEAST AND EAST CENTRAL NEBRASKA
EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 335 PM UNTIL
1100 PM CST.
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 15 MILES SOUTH OF
MEDICINE LODGE KANSAS TO 5 MILES EAST NORTHEAST OF COLUMBUS
NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).
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.
DISCUSSION...VISIBLE IMAGERY AND RADAR INDICATE CONVECTION IS
DEVELOPING ALONG THE DRYLINE FROM SOUTH CENTRAL NEB ACROSS CENTRAL
KS. THE AIR MASS EAST OF THE DRYLINE IS MODESTLY MOIST WITH SURFACE
DEW POINTS IN THE LOW/MID 50S...BUT WITH STEEP LAPSE RATES THE
ENVIRONMENT HAS DESTABILIZED THIS AFTERNOON WITH MLCAPE NEAR 1000
J/KG. STORMS ARE EXPECTED TO CONTINUE TO DEVELOP AND INTENSIFY
THROUGH THE EVENING AS WIND FIELDS/VERTICAL SHEAR INCREASE AND
DYNAMIC FORCING ALOFT OVERSPREAD THE WARM SECTOR. A FEW SUPERCELLS
ARE LIKELY OVER THE NEXT 3-4 HRS BEFORE STORMS GROW UPSCALE INTO ONE
OR MORE LINEAR SEGMENTS. DAMAGING WIND AND LARGE HAIL WILL BE THE
PRIMARY SEVERE THREATS...BUT A TORNADO OR TWO IS ALSO POSSIBLE
ALTHOUGH LARGER T/TD SPREADS AND HIGHER LCL HEIGHTS ARE EXPECTED TO
LIMIT THE OVERALL TORNADO THREAT.
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 450. MEAN STORM
MOTION VECTOR 23045.
...WEISS
via SPC Forecast Products http://www.spc.noaa.gov/products/watch/ww0675.html
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