WATCHES: Severe Thunderstorm Watch Number 496

WWUS20 KWNS 192020
SEL6
SPC WW 192020
MTZ000-SDZ000-WYZ000-200400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 496
NWS STORM PREDICTION CENTER NORMAN OK
220 PM MDT MON JUL 19 2010

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

SOUTHEAST MONTANA
WESTERN SOUTH DAKOTA
NORTHEAST WYOMING

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 220 PM UNTIL
1000 PM MDT.

HAIL TO 2.5 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 80 MILES NORTH
NORTHWEST OF SHERIDAN WYOMING TO 20 MILES EAST OF PHILIP SOUTH
DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).

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 494...WW 495...

DISCUSSION...ISOLATED SUPERCELL THUNDERSTORMS HAVE FORMED OVER
SOUTHEAST MT. OTHER ACTIVITY IS LIKELY TO FORM THROUGH THE
AFTERNOON OVER NORTHEAST WY AND WESTERN SD AHEAD OF APPROACHING
SHORTWAVE TROUGH. COOLING TEMPERATURES ALOFT AND STEEP LAPSE RATES
WILL PROMOTE A RISK OF LARGE HAIL IN STRONGER STORMS. BOWING
SEGMENTS MAY ALSO POSE A RISK OF DAMAGING WINDS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 29030.

...HART

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