WATCHES: Severe Thunderstorm Watch Number 705

WWUS20 KWNS 302235
SEL5
SPC WW 302235
MNZ000-NDZ000-SDZ000-310600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 705
NWS STORM PREDICTION CENTER NORMAN OK
535 PM CDT SAT JUL 30 2011

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

CENTRAL AND SOUTHERN MINNESOTA
FAR SOUTHEAST NORTH DAKOTA
EASTERN SOUTH DAKOTA

EFFECTIVE THIS SATURDAY AFTERNOON AND SUNDAY MORNING FROM 535 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 90
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST OF
WATERTOWN SOUTH DAKOTA TO 75 MILES EAST NORTHEAST OF SAINT CLOUD
MINNESOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).

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 703...

DISCUSSION...STRONG/SEVERE TSTMS ARE EXPECTED TO CONTINUE TO
INCREASE THROUGH EARLY/MID EVENING IN VICINITY OF A SOUTHEASTWARD
MOVING FRONTAL BOUNDARY...WITH ADDITIONAL DEVELOPMENT POSSIBLE IN
VICINITY OF AN OUTFLOW BOUNDARY. ON THE SOUTHERN FRINGE OF STRONGER
WESTERLIES ALOFT...A MOIST AND VERY UNSTABLE AIRMASS WITH MLCAPE ON
THE ORDER OF 2500-4500 J/KG WILL SUPPORT SOME SUPERCELLS/SUSTAINED
MULTICELLS CAPABLE OF LARGE HAIL/DAMAGING WINDS AS STORMS SPREAD
SOUTHEASTWARD/EVENTUALLY CONGEAL THROUGH THE EVENING.

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 600. MEAN STORM
MOTION VECTOR 30020.

...GUYER/THOMPSON

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