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418 

WWUS20 KWNS 240029

SEL5

SPC WW 240029

IAZ000-NEZ000-240500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 85

NWS STORM PREDICTION CENTER NORMAN OK

730 PM CDT FRI APR 23 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       FAR WESTERN IOWA

       EASTERN AND NORTHEASTERN NEBRASKA



EFFECTIVE THIS FRIDAY NIGHT FROM 730 PM UNTIL MIDNIGHT CDT.



TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST OF ONEILL

NEBRASKA TO 20 MILES EAST OF OMAHA NEBRASKA.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU5).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 80...WW 81...WW 82...WW

83...WW 84...



DISCUSSION...TSTMS HAVE FORMED IN THE PAST HALF HOUR ALONG MERGING

OCCLUSION AND WARM FRONT OVER ERN NEB...POSSIBLY IN RESPONSE TO

INCREASED ASCENT ASSOCIATED WITH APPARENT VORT LOBE SHOWN MOVING NNE

ACROSS REGION IN WV IMAGERY.  AMPLE LOW LVL DIRECTIONAL SHEAR EXISTS

INVOF THE MERGING BOUNDARIES TO SUPPORT LOW LVL STORM

ROTATION...WITH AN ATTENDANT RISK FOR TORNADOES/HAIL.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

400. MEAN STORM MOTION VECTOR 17025.





...CORFIDI

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