

755 

WWUS20 KWNS 170023

SEL9

SPC WW 170023

MTZ000-NDZ000-SDZ000-170800-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 329

NWS STORM PREDICTION CENTER NORMAN OK

620 PM MDT WED JUN 16 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHEAST MONTANA

       WESTERN NORTH DAKOTA

       NORTHWEST/NORTH-CENTRAL SOUTH DAKOTA



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 620 PM

UNTIL 200 AM MDT.



TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 60 MILES WEST SOUTHWEST OF

GLASGOW MONTANA TO 55 MILES SOUTH SOUTHEAST OF GARRISON NORTH

DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 325...WW 326...WW

327...WW 328...



DISCUSSION...POTENT LARGER TROUGH SPREADING ACROSS THE NRN ROCKIES

TONIGHT WILL DRIVE DEEPENING SURFACE CYCLONE ACROSS ERN MT. AS THE

SURFACE LOW TRACKS NWD FROM WY...ASSOCIATED WARM FRONT WILL LIFT NWD

AS WELL. LIFT WITH THESE FEATURES WILL ACT ON VERY MOIST AND

UNSTABLE AIRMASS WHICH IN TURN WILL MAINTAIN ROBUST THUNDERSTORM

DEVELOPMENT IN A STRONGLY SHEARED REGIME. EXPECT LONG-LIVED AND

ORGANIZED STORMS...INITIALLY SUPERCELLULAR...BUT PERHAPS BECOMING

MORE LINEAR/MCS-LIKE WITH TIME...TO RESULT IN VERY LARGE

HAIL...DAMAGING WINDS...AND A COUPLE OF TORNADOES.



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

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 22030.





...CARBIN

