

995 

WWUS20 KWNS 091430

SEL7

SPC WW 091430

IAZ000-MOZ000-NEZ000-092000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 567

NWS STORM PREDICTION CENTER NORMAN OK

925 AM CDT THU JUL 9 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WEST CENTRAL AND SOUTHWEST IOWA

       NORTHWEST MISSOURI

       EAST CENTRAL AND SOUTHEAST NEBRASKA



EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 925 AM UNTIL

300 PM CDT.



HAIL TO 2 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 80

STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES NORTH OF

TEKAMAH NEBRASKA TO 10 MILES SOUTHEAST OF FALLS CITY 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 566...



DISCUSSION...BOW ECHO CONVECTIVE SYSTEM IS MOVING SEWD 30 KT...AND

SYSTEM MAY BEGIN TO PROPAGATE MORE SSEWD WITH TIME THROUGH LOW LEVEL

MOISTURE AXIS NEAR THE MO RIVER.  LOW LEVEL WARM ADVECTION IS

EXPECTED TO MAINTAIN DEEP LAYER ASCENT ALONG THE ERN EDGE OF THE EML

OVER THE PLAINS...WHILE FORCED ASCENT PERSIST ALONG THE GUST FRONT

ALONG THE LEADING EDGE OF THE STORMS.  ALTHOUGH THE CONVECTIVE

SYSTEM MAY EXHIBIT SOME FLUCTUATIONS IN INTENSITY THIS

MORNING...THREAT FOR DAMAGING WIND GUSTS AND LARGE HAIL WILL LIKELY

CONTINUE INTO THE EARLY AFTERNOON.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 31035.





...WEISS

