SPC Severe Thunderstorm Watch 493

WW 493 SEVERE TSTM KS NE 152050Z – 160400Z


URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 493
NWS STORM PREDICTION CENTER NORMAN OK
350 PM CDT THU AUG 15 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
  KANSAS
  SOUTHWEST NEBRASKA

* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 350 PM UNTIL
  1100 PM CDT.

* PRIMARY THREATS INCLUDE...
  SEVERAL VERY LARGE HAIL EVENTS TO 3 INCHES IN DIAMETER POSSIBLE
  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTH
SOUTHWEST OF GOODLAND KANSAS TO 25 MILES EAST SOUTHEAST OF
MANHATTAN KANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 492...

DISCUSSION...SEVERE STORM POTENTIAL SHOULD INCREASE INTO THE EVENING
OVER A NUMBER OF AREAS FROM EXTREME SRN NEB ACROSS MUCH OF KS.
MODERATE INSTABILITY AND AN AMPLIFYING MID/UPPER TROUGH WILL SUPPORT
AN INCREASE IN LARGE HAIL AND HIGH WIND FROM STORMS ASSOCIATED WITH
1) AN MCV DRIFTING SLOWLY EAST INTO NERN KS...2) THE TRAILING EDGE
OF THE MCV WHERE WARM ADVECTION CONTINUES TO SUPPORT CONVECTION IN A
VERY STEEP LAPSE RATE ENVIRONMENT ACROSS WRN KS...AND 3) ALONG SFC
TROUGH AXIS AHEAD OF A SHORTWAVE TROUGH ADVANCING TOWARD WRN NEB.
ALL THESE AREAS WILL SEE SOME CHANCE FOR LARGE HAIL IN THE
SHORT-TERM. STORMS DEVELOPING IN RESPONSE TO THE NEB SHORTWAVE ARE
LIKELY TO CONSOLIDATE INTO AN MCS LATER TONIGHT AND THEN SPREAD
SOUTH ACROSS THE REMAINDER OF WRN/CNTRL KS POSING A CONTINUING
CHANCE FOR DAMAGING WINDS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 34030.


...CARBIN

via SPC Forecast Products http://www.spc.noaa.gov/products/watch/ww0493.html