

538 

WWUS20 KWNS 122005

SEL1

SPC WW 122005

MTZ000-NDZ000-130300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 461

NWS STORM PREDICTION CENTER NORMAN OK

205 PM MDT MON JUL 12 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN MONTANA

       WESTERN NORTH DAKOTA



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 205 PM UNTIL 900

PM MDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES EAST AND WEST OF A LINE FROM 70 MILES NORTH

NORTHEAST OF WOLF POINT MONTANA TO 25 MILES SOUTH OF BROADUS

MONTANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...CONTINUE...WW 458...WW 459...WW 460...



DISCUSSION...TSTMS ARE EXPECTED TO DEVELOP LATE THIS AFTERNOON INTO

EVENING IN ADVANCE OF A POTENT SHORT WAVE TROUGH TRANSLATING ESEWD

INTO THE NRN HIGH PLAINS.  THE PRESENCE OF SUFFICIENT BOUNDARY LAYER

MOISTURE...STEEP LAPSE RATES AND STRENGTHENING VERTICAL SHEAR WILL

ALL CONTRIBUTE TO ORGANIZED STORMS INCLUDING SUPERCELLS AND BOWING

STRUCTURES WITH THE THREAT FOR LARGE HAIL AND DAMAGING WINDS.



AVIATION...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 500. MEAN STORM

MOTION VECTOR 28030.





...MEAD

