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646 

WWUS20 KWNS 062100

SEL7

SPC WW 062100

KSZ000-NEZ000-070400-



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

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