

100 

WWUS20 KWNS 232051

SEL5

SPC WW 232051

IAZ000-MOZ000-NEZ000-SDZ000-240300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 55

NWS STORM PREDICTION CENTER NORMAN OK

350 PM CDT MON MAR 23 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF WESTERN IOWA

       SMALL PART OF NORTHWEST MISSOURI

       PARTS OF EASTERN NEBRASKA

       PARTS OF SOUTHERN SOUTH DAKOTA



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 350 PM UNTIL

1000 PM CDT.



TORNADOES...HAIL TO 2 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 90 STATUTE

MILES EAST AND WEST OF A LINE FROM 10 MILES WEST SOUTHWEST OF

FALLS CITY NEBRASKA TO 35 MILES WEST NORTHWEST OF HURON SOUTH

DAKOTA.  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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 53. WATCH NUMBER 53 WILL NOT BE IN EFFECT AFTER 350

PM CDT. CONTINUE...WW 54...



DISCUSSION...THUNDERSTORMS ARE RAPIDLY DEVELOPING NEWD AHEAD OF

VIGOROUS UPPER TROUGH AND SURFACE LOW MOVING ACROSS CENTRAL NEB.

WITH VERY STRONG SHEAR AND ADEQUATE INSTABILITY...SUPERCELLS ARE

LIKELY WITH LARGE HAIL/DAMAGING WINDS AND POTENTIAL TORNADOS.



AVIATION...TORNADOES AND 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

450. MEAN STORM MOTION VECTOR 21045.





...HALES

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