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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 473

NWS STORM PREDICTION CENTER NORMAN OK

555 PM MDT THU JUL 5 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       FAR SOUTHEAST MONTANA

       WESTERN AND WEST CENTRAL SOUTH DAKOTA

       FAR NORTHEAST WYOMING



EFFECTIVE THIS THURSDAY AFTERNOON FROM 555 PM UNTIL MIDNIGHT MDT.



TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 85 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE

MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH OF BUFFALO

SOUTH DAKOTA TO 75 MILES SOUTH SOUTHWEST OF PHILIP SOUTH DAKOTA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 470...WW 471...WW 472...



DISCUSSION...TSTMS EXPECTED TO CONTINUE STRENGTHENING AND INCREASING

IN EXTENT THROUGH LATE TNGT OVER WRN SD REGION...IN ZONE OF

SUSTAINED/MOISTENING LOW LVL SELY FLOW ASSOCIATED WITH UPR IMPULSE

CROSSING THE NRN RCKYS.  PER DISCUSSION IN EARLIER SVR TSTM WATCH

#472...INCREASING UPR LVL DIVERGENCE AND STRENGTHENING LOW TO MID

LVL SHEAR RELATED TO UPR IMPULSE WILL YIELD AN ENVIRONMENT FAVORABLE

FOR LOW LVL MESOCYCLONES AND POSSIBLY TORNADOES...ESPECIALLY WITH

ANY MORE DISCRETE STORMS.



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

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 75 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 21025.





...CORFIDI

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