WATCHES: Tornado Watch Number 673

WWUS20 KWNS 222241
SEL3
SPC WW 222241
NDZ000-SDZ000-230700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 673
NWS STORM PREDICTION CENTER NORMAN OK
535 PM CDT FRI JUL 22 2011

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

WESTERN AND SOUTHERN NORTH DAKOTA
NORTHERN SOUTH DAKOTA

EFFECTIVE THIS FRIDAY AFTERNOON AND SATURDAY MORNING FROM 535 PM
UNTIL 200 AM CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE
MILES EAST AND WEST OF A LINE FROM 70 MILES NORTHWEST OF MINOT
NORTH DAKOTA TO 55 MILES SOUTH 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 670...WW 671...WW 672...

DISCUSSION...TSTMS ARE BEGINNING TO FORM ALONG WNW/ESE ORIENTED WARM
FRONT IN S CNTRL ND. MODERATE TO STRONGLY VEERING LOW LVL WIND
PROFILES IN THIS REGION...STEEP LOW LVL LAPSE RATES...AND PRESENCE
OF AMPLE MOISTURE SUGGEST POTENTIAL FOR SUPERCELLS WITH
TORNADOES...IN ADDITION TO VERY LARGE HAIL/LOCALLY DMGG WIND. WITH
TIME...BROKEN BAND OF STORMS WITH EMBEDDED SUPERCELLS NOW IN ERN MT
EXPECTED TO MOVE INTO WRN ND AS ASSOCIATED UPR LVL JET STREAK
CONTINUES NEWD. THIS ACTIVITY MAY EVOLVE INTO A LARGER SCALE BOW
MCS...POSSIBLY YIELDING A MORE WIDESPREAD DMGG WIND THREAT...IN
ADDITION TO A CONTINUING RISK FOR ISOLD TORNADOES/SVR HAIL INTO LATE
TNGT/EARLY SAT.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
600. MEAN STORM MOTION VECTOR 24020.

...CORFIDI

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