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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 385

NWS STORM PREDICTION CENTER NORMAN OK

405 PM MDT TUE JUN 22 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WESTERN NEBRASKA

       WESTERN AND CENTRAL SOUTH DAKOTA

       FAR SOUTHEASTERN WYOMING



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 405 PM UNTIL

1100 PM MDT.



TORNADOES...HAIL TO 3 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 30 MILES WEST NORTHWEST OF

PHILIP SOUTH DAKOTA TO 5 MILES SOUTH SOUTHWEST OF SIDNEY

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 382...WW 383...WW 384...



DISCUSSION...SHORTWAVE TROUGH MOVING EWD THROUGH CENTRAL WY APPEARS

TO HAVE AIDED STORM INITIATION IN SERN WY. AS THIS TROUGH

APPROACHES...STORMS ARE EXPECTED TO INCREASE IN COVERAGE THE NEXT

COUPLE OF HOURS AND SPREAD EWD ACROSS THE WW. EFFECTIVE SHEAR AT

50-60 KT INDICATES SUPERCELLS ARE LIKELY. THE PRIMARY THREAT WITH

THESE STORMS WILL BE VERY LARGE HAIL...THOUGH STRONGLY VEERING WINDS

IN THE LOWER 1-2 KM AND PRESENCE OF EXISTING BOUNDARIES INDICATE

TORNADOES ARE ALSO POSSIBLE.



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

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

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

550. MEAN STORM MOTION VECTOR 27025.





...IMY

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