WATCHES: Severe Thunderstorm Watch Number 702

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

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