SEL5
SPC WW 210704
MIZ000-MNZ000-WIZ000-LSZ000-211400-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 675
NWS STORM PREDICTION CENTER NORMAN OK
205 AM CDT TUE SEP 21 2010
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
WESTERN UPPER MICHIGAN
EASTERN MINNESOTA
NORTHERN AND WESTERN WISCONSIN
LAKE SUPERIOR
EFFECTIVE THIS TUESDAY MORNING FROM 205 AM UNTIL 900 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 60
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST OF
MINNEAPOLIS MINNESOTA TO 65 MILES EAST OF IRONWOOD MICHIGAN. 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.
DISCUSSION...TSTMS HAVE INCREASED IN THE PAST 30 MINUTES OVER ERN
MN...POSSIBLY IN REFLECTING FACT THAT FORCING WITH SRN STREAM
SHORTWAVE IMPULSE APPEARS TO HAVE ENCOUNTERED RESERVOIR OF HIGHER PW
OVER WW REGION. STRENGTH OF CLOUD LAYER SHEAR AND STEEP MID LVL
LAPSE RATES SUGGEST POTENTIAL FOR SVR HAIL AND POSSIBLY SMALL BOWING
SEGMENTS WITH HIGH WIND AS FORCING CONTINUES NEWD.
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 450. MEAN STORM
MOTION VECTOR 23035.
...CORFIDI
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