

128 

WWUS20 KWNS 292300

SEL2

SPC WW 292300

MTZ000-NDZ000-300500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 702

NWS STORM PREDICTION CENTER NORMAN OK

505 PM MDT FRI JUL 29 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EAST CENTRAL AND NORTHEAST MONTANA

       WESTERN NORTH DAKOTA



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 505 PM UNTIL

1100 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 70

STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH

NORTHWEST OF WILLISTON NORTH DAKOTA TO 50 MILES SOUTHEAST OF

GLENDIVE MONTANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 699...WW 700...WW 701...



DISCUSSION...SCATTERED THUNDERSTORM DEVELOPMENT WILL CONTINUE ACROSS

E/NE MT ALONG A SURFACE TROUGH THIS EVENING.  STEEP LAPSE RATES AND

MLCAPE NEAR 2000 J/KG WILL SUPPORT STRONG UPDRAFTS...WHILE

DEEP-LAYER VERTICAL SHEAR WILL BE SUFFICIENT FOR SUPERCELLS.  LARGE

HAIL AND STRONG/DAMAGING DOWNDRAFT WINDS WILL BE THE PRIMARY SEVERE

THREATS FOR THE NEXT SEVERAL HOURS.



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 27020.





...THOMPSON

