

981 

WWUS20 KWNS 190715

SEL5

SPC WW 190715

IAZ000-MOZ000-NEZ000-191500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 475

NWS STORM PREDICTION CENTER NORMAN OK

210 AM CDT FRI JUN 19 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN AND CENTRAL IOWA

       FAR NORTHWEST MISSOURI

       EASTERN NEBRASKA



EFFECTIVE THIS FRIDAY MORNING FROM 210 AM UNTIL 1000 AM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES SOUTH OF

COLUMBUS NEBRASKA TO 30 MILES NORTH OF OTTUMWA IOWA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU5).



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 471...WW 472...WW

473...WW 474...



DISCUSSION...CLUSTERS OF SUSTAINED TSTMS/POSSIBLE SUPERCELLS

EXPECTED TO PERSIST AND GRADUALLY INCREASE IN COVERAGE THROUGH DAWN

TODAY FROM ERN NEB INTO WRN/CNTRL IA...IN AREA OF STRENGTHENING LOW

LVL WAA DOWNSTREAM FROM CO UPR VORT.  ACTIVITY EVENTUALLY MAY MERGE

INTO A LOOSELY-ORGANIZED FORWARD-PROPAGATING SYSTEM WITH EMBEDDED

BOWS.  THREAT WILL EXIST FOR SVR HAIL AND DMGG WIND.  TORNADO

POTENTIAL ATTM APPEARS LOW...WITH ANY SUCH THREAT LIKELY TIED TO

BOW/OUTFLOW INTERSECTIONS.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 26035.





...CORFIDI

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