WATCHES: Severe Thunderstorm Watch Number 550

WWUS20 KWNS 292136
SEL0
SPC WW 292136
MTZ000-NDZ000-300600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 550
NWS STORM PREDICTION CENTER NORMAN OK
440 PM CDT THU JUL 29 2010

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

NORTHEAST MONTANA
NORTHWEST AND NORTH CENTRAL NORTH DAKOTA

EFFECTIVE THIS THURSDAY AFTERNOON AND FRIDAY MORNING FROM 440 PM
UNTIL 100 AM CDT.

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 70
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 70 MILES WEST
SOUTHWEST OF GLASGOW MONTANA TO 70 MILES EAST SOUTHEAST OF MINOT
NORTH DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

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 548...WW 549...

DISCUSSION...SCATTERED THUNDERSTORMS ARE INCREASING OVER NORTHEAST
MT WHERE BACKED LOW LEVEL WINDS AND MODERATE INSTABILITY ARE
PRESENT. OTHER STORMS ARE LIKELY TO FORM THIS EVENING OVER PORTIONS
OF NORTHWEST AND NORTH CENTRAL ND IN REGION OF RELATIVELY STRONG LOW
LEVEL WARM ADVECTION. FAVORABLE EFFECTIVE SHEAR AND CAPE PARAMETERS
SUPPORT A RISK OF SUPERCELL STORMS CAPABLE OF LARGE HAIL AND
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 27030.

...HART

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