SPC Severe Thunderstorm Watch 627

WW 627 SEVERE TSTM KS NE 062100Z – 070400Z


URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 627
NWS STORM PREDICTION CENTER NORMAN OK
400 PM CDT THU SEP 6 2012

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

       WESTERN AND CENTRAL KANSAS
       SOUTH CENTRAL NEBRASKA

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 400 PM UNTIL
1100 PM CDT.

HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80
STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES NORTHEAST OF
GRAND ISLAND NEBRASKA TO 25 MILES EAST OF LIBERAL KANSAS.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU7).

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 625...WW 626...

DISCUSSION...TSTMS EXPECTED TO DEVELOP IN THE NEXT 1-2 HOURS ALONG
BROKEN LEE TROUGH/DRY LINE SEGMENTS IN WRN KS/S CNTRL NEB...WHERE
35-40 KT WNWLY DEEP SHEAR WILL FOSTER STORM ORGANIZATION/SUSTENANCE.
GIVEN THERMODYNAMIC ENVIRONMENT WITH STEEP LOW-LVL LAPSE RATES
BENEATH DEEP EML...POTENTIAL WILL EXIST FOR LOCALLY DMGG WIND AND
POSSIBLY A COUPLE SUPERCELLS WITH BOTH HIGH WIND AND HAIL THROUGH
MID EVE.  THE STORMS MAY CONSOLIDATE INTO A CLUSTER OR TWO BY LATE
EVE AS SWLY LLJ STRENGTHENS IN RESPONSE TO CONTINUED ESE MOVEMENT OF
POTENT MT UPR TROUGH...WITH A CONTINUING RISK FOR LOCALLY DMGG
WIND/HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 26025.


...CORFIDI

via SPC Forecast Products http://www.spc.noaa.gov/products/watch/ww0627.html