WATCHES: Severe Thunderstorm Watch Number 597

WWUS20 KWNS 100000
SEL7
SPC WW 100000
MTZ000-100700-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 597
NWS STORM PREDICTION CENTER NORMAN OK
600 PM MDT MON AUG 9 2010

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

EASTERN MONTANA

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 600 PM UNTIL
100 AM MDT.

HAIL TO 1.5 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 85
STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES NORTHWEST OF
WILLISTON NORTH DAKOTA TO 25 MILES SOUTH OF MILES CITY MONTANA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU7).

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 595...WW 596...

DISCUSSION...STRONG TO SVR TSTMS...AND POSSIBLY A COUPLE
SUPERCELLS...EXPECTED OVER ERN MT THIS EVE THROUGH EARLY TUE AS
LARGE SCALE ASCENT INCREASES AHEAD OF EJECTING UPR IMPULSE NOW IN
ERN ID/WRN WY. SHALLOW NELY LOW LVL FLOW AND FAIRLY STEEP LOW LVL
LAPSE RATES OVER ERN MT SHOULD ENHANCE NEWD PROPAGATION OF
STORMS...WHERE DEEP WIND PROFILES SHOULD BE SUPPORTIVE OF BOWING
SEGMENTS WITH HIGH WIND/ MARGINALLY SVR HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 22030.

...CORFIDI

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