WATCHES: Severe Thunderstorm Watch Number 521

WWUS20 KWNS 152252
SEL1
SPC WW 152252
MNZ000-NDZ000-160600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 521
NWS STORM PREDICTION CENTER NORMAN OK
550 PM CDT SUN JUL 15 2007

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

WESTERN MINNESOTA
EASTERN AND CENTRAL NORTH DAKOTA

EFFECTIVE THIS SUNDAY AFTERNOON AND MONDAY MORNING FROM 550 PM
UNTIL 100 AM CDT.

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 80
STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH
NORTHWEST OF DEVILS LAKE NORTH DAKOTA TO 70 MILES SOUTH OF FARGO
NORTH DAKOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

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 518...WW 520...

DISCUSSION...TSTMS EXPECTED TO DEVELOP/INTENSIFY INVOF STALLED NW/SE
FRONT OVER ERN ND THIS EVENING...DOWNSTREAM FROM APPARENT MID LVL
VORT EMBEDDED IN NW FLOW OVER SRN MANITOBA. STRONGLY VEERING DEEP
WIND PROFILES WILL SUPPORT SUPERCELLULAR STRUCTURE WITH ANY
SUSTAINED STORMS...AND POSSIBLY AN ISOLATED TORNADO OR TWO. BUT
RELATIVELY MODEST BOUNDARY LAYER MOISTURE AND MODERATE TO LARGE T/TD
SPREADS ALOFT SUGGEST MAIN SVR THREATS SHOULD BE WIND/HAIL.

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 500. MEAN STORM
MOTION VECTOR 33035.

..CORFIDI

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