WATCHES: Tornado Watch Number 733

WWUS20 KWNS 240203
SEL3
SPC WW 240203
MTZ000-NDZ000-SDZ000-240700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 733
NWS STORM PREDICTION CENTER NORMAN OK
755 PM MDT SUN AUG 23 2009

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

EASTERN MONTANA
WESTERN NORTH DAKOTA
NORTHWEST SOUTH DAKOTA

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 755 PM UNTIL
100 AM MDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 105 STATUTE
MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH NORTHWEST OF
WILLISTON NORTH DAKOTA TO 30 MILES SOUTHWEST OF LEMMON SOUTH
DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

OTHER WATCH INFORMATION...CONTINUE...WW 732...

DISCUSSION...TSTMS/SUPERCELLS EXPECTED TO INCREASE/DEVELOP OVER WW
AREA THROUGH EARLY MON...IN ZONE OF INCREASING LOW LVL WAA/UPR
DIVERGENCE DOWNSTREAM FROM SHORTWAVE IMPULSE NOW ENTERING WRN WY.
STORMS NOW OVER NE MT LIKELY ARE HIGH BASED. THESE SHOULD DEVELOP
DOWNWARD WITH TIME AS THEY ENCOUNTER MOISTENING ELY LOW LVL FLOW N
OF SE MT SFC LOW. OTHER STORMS...LIKELY MORE NEARLY
SFC-BASED...SHOULD FORM SWD AND EWD INTO WRN ND...IN REGION OF
GREATER LOW LVL SPEED/ DIRECTIONAL SHEAR. WHILE LOW LVL CIN WILL BE
A FACTOR OPPOSING A WIDESPREAD TORNADIC THREAT...ABSENCE OF STRONG
LOW LVL LINEAR FORCING AND ENLARGED LOW LVL HODOGRAPHS WITH
STRENGTHENING LLJ SUGGESTS POTENTIAL FOR ISOLD TORNADOES LATER THIS
EVE/EARLY MON...IN ADDITION TO SVR HAIL AND WIND.

AVIATION...TORNADOES AND 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
500. MEAN STORM MOTION VECTOR 24030.

...CORFIDI

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