WATCHES: Severe Thunderstorm Watch Number 432

WWUS20 KWNS 302212
SEL2
SPC WW 302212
MTZ000-WYZ000-010500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 432
NWS STORM PREDICTION CENTER NORMAN OK
410 PM MDT WED JUN 30 2010

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

EASTERN MONTANA
EXTREME NORTH CENTRAL WYOMING

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 410 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 110
STATUTE MILES EAST AND WEST OF A LINE FROM 80 MILES SOUTHEAST OF
BILLINGS MONTANA TO 75 MILES NORTHWEST 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 430...WW 431...

DISCUSSION...STRONG/SEVERE THUNDERSTORMS OVER SOUTH CENTRAL MT AND
EXTREME NORTH CENTRAL WY ARE LIKELY TO PROGRESS NEWD THROUGH THE
EVENING HOURS ALONG THE SOUTHEAST EDGE OF STRONGER FLOW ALOFT. SWLY
MID LEVEL WINDS OF 40-50 KT ARE CONTRIBUTING TO SUFFICIENT DEEP
LAYER SHEAR TO ENHANCE STORM ORGANIZATION AND INTENSITY...WITH STORM
ROTATION POSSIBLE IN STRONGER CELLS. LOW LEVEL MOISTURE INCREASES
IN EASTERN MT WHERE SURFACE DEW POINTS ARE IN THE MID/UPPER 50S
SUPPORTING MLCAPE OF 1000-1500 J/KG...INDICATING SEVERE POTENTIAL
WILL SPREAD NEWD WITH TIME.

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 450. MEAN STORM
MOTION VECTOR 24030.

...WEISS

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