SPC Severe Thunderstorm Watch 566

WW 566 SEVERE TSTM IA KS MO NE 082155Z – 090600Z


URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 566
NWS STORM PREDICTION CENTER NORMAN OK
455 PM CDT WED AUG 8 2012

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

       WESTERN IOWA
       NORTHEAST AND EAST CENTRAL KANSAS
       NORTHWEST AND WEST CENTRAL MISSOURI
       EASTERN NEBRASKA

EFFECTIVE THIS WEDNESDAY AFTERNOON AND THURSDAY MORNING FROM 455
PM UNTIL 100 AM CDT.

HAIL TO 1.5 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 15 MILES NORTHWEST OF
TEKAMAH NEBRASKA TO 55 MILES SOUTH SOUTHWEST OF OLATHE KANSAS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU6).

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 565...

DISCUSSION...TSTMS NOW FORMING IN ERN NEB MAY GROW INTO A SMALL
SSE-MOVING MCS OR TWO AS ACTIVITY CONSOLIDATES ALONG CORRIDOR OF AIR
LEFT UNDISTURBED BY MCS NOW TRACKING SE THROUGH CNTRL IA. MODERATE
MID LVL NW FLOW AND SIZABLE LOW LVL TEMP-DEW POINT SPREADS SUGGEST
POTENTIAL FOR WET MICROBURSTS/LOCALLY DMGG WIND AND POSSIBLY SVR
HAIL. OUTFLOW BOUNDARY INTERACTIONS ALSO MAY YIELD A TORNADO OR TWO
GIVEN STEEP LOW LVL LAPSE RATES AND LOW LVL VEERING WIND PROFILES.
BUT ANY SUCH ACTIVITY SHOULD REMAIN SHORT-LIVED.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 33020.


...CORFIDI

via SPC Forecast Products http://www.spc.noaa.gov/products/watch/ww0566.html