WATCHES: Severe Thunderstorm Watch Number 265

WWUS20 KWNS 102017
SEL5
SPC WW 102017
IDZ000-MTZ000-ORZ000-110300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 265
NWS STORM PREDICTION CENTER NORMAN OK
215 PM MDT THU MAY 10 2007

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

CENTRAL IDAHO
PARTS OF SOUTHWEST AND SOUTH CENTRAL MONTANA
SMALL PART OF NORTHEAST OREGON

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 215 PM UNTIL
900 PM 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 65
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES WEST
SOUTHWEST OF BAKER OREGON TO 35 MILES NORTHEAST OF BILLINGS
MONTANA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).

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 264...

DISCUSSION...THUNDERSTORMS EXPECTED TO INCREASE BOTH IN NUMBER AND
INTENSITY ACROSS THE WATCH AREA REMAINDER OF AFTERNOON. THIS IS IN
RESPONSE TO APPROACH OF MID LEVEL WIND MAX FROM OREGON ENHANCING
SHEAR COUPLED WITH STEEP LAPSE RATES AND ADEQUATE INSTABILITY.
PRIMARY THREAT WILL BE LARGE HAIL AND WIND DAMAGE...PARTICULARLY
ASSOCIATED WITH STORMS THAT EVOLVE INTO LINE SEGMENTS.

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 450. MEAN STORM
MOTION VECTOR 24035.

..HALES

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