WATCHES: Severe Thunderstorm Watch Number 560

WWUS20 KWNS 071913
SEL0
SPC WW 071913
IAZ000-MNZ000-NEZ000-SDZ000-080300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 560
NWS STORM PREDICTION CENTER NORMAN OK
215 PM CDT TUE JUL 7 2009

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

NORTHEAST IOWA
SOUTHWEST MINNESOTA
NORTHEAST NEBRASKA
EASTERN SOUTH DAKOTA

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 215 PM UNTIL
1000 PM CDT.

HAIL TO 2 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 NORTH AND SOUTH OF A LINE FROM 15 MILES NORTH
NORTHWEST OF CHAMBERLAIN SOUTH DAKOTA TO 20 MILES NORTHEAST OF
SPENCER IOWA. 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 559...

DISCUSSION...THUNDERSTORMS ARE EXPECTED TO INTENSIFY IN THE NEXT
COUPLE OF HOURS OVER EASTERN SD...SPREADING INTO PARTS OF SOUTHWEST
MN AND NORTHWEST IA DURING EVENING. STRONG INSTABILITY...SUFFICIENT
DEEP LAYER VERTICAL SHEAR...AND PRESENCE OF SEVERAL WEAK BOUNDARIES
WILL HELP TO PROMOTE A RISK OF DAMAGING WINDS AND HAIL WITH STRONGER
CELLS THROUGH 03Z.

AVIATION...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 29030.

...HART

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