

929 

WWUS20 KWNS 172233

SEL7

SPC WW 172233

IAZ000-KSZ000-NEZ000-180600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 337

NWS STORM PREDICTION CENTER NORMAN OK

535 PM CDT THU JUN 17 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST IOWA

       NORTHERN KANSAS

       SOUTHEAST NEBRASKA



EFFECTIVE THIS THURSDAY AFTERNOON AND FRIDAY MORNING FROM 535 PM

UNTIL 100 AM CDT.



HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80

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 65 MILES SOUTHWEST OF

RUSSELL KANSAS TO 25 MILES NORTHEAST OF LINCOLN NEBRASKA.  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 332...WW 333...WW

334...WW 335...WW 336...



DISCUSSION...ISOLATED TO SCATTERED SEVERE TSTMS APPEAR INCREASING

LIKELY TO INCREASE ALONG PRE-FRONTAL WIND SHIFT SITUATED ACROSS

CNTRL KS INTO SERN NEB THIS EVENING. AIRMASS ALONG THIS BOUNDARY IS

VERY UNSTABLE AND SHOULD FUEL INTENSE STORM UPDRAFTS. MID LEVEL FLOW

DOES WEAKEN WITH SWD EXTENT AWAY FROM STRONG UPPER TROUGH CROSSING

THE NRN PLAINS ATTM. HOWEVER...EXPECT SUFFICIENT CLOUD-BEARING SHEAR

FOR SOME STORM ORGANIZATION/PERSISTENCE WITH VERY LARGE HAIL AND

POTENTIALLY DAMAGING WINDS LIKELY FROM SOME OF THE STRONGER CELLS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 25025.





...CARBIN

