SEL8
SPC WW 212215
MNZ000-NDZ000-220500-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 158
NWS STORM PREDICTION CENTER NORMAN OK
515 PM CDT SAT APR 21 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHWESTERN MINNESOTA
SOUTHEASTERN NORTH DAKOTA
EFFECTIVE THIS SATURDAY AFTERNOON FROM 515 PM UNTIL MIDNIGHT 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 60
STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES SOUTH
SOUTHWEST OF FARGO NORTH DAKOTA TO 50 MILES NORTHWEST OF BEMIDJI
MINNESOTA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).
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 154...WW 155...WW
156...WW 157...
DISCUSSION...SURFACE COLD FRONT AND OUTFLOW BOUNDARIES FROM EARLIER
STORMS WILL MAINTAIN FOCUS FOR STRONG TO SEVERE THUNDERSTORM
DEVELOPMENT THIS EVENING. AIR MASS REMAINS MODERATELY UNSTABLE WITH
EFFECTIVE BULK SHEAR FROM 35-45 KT SUPPORTING SUPERCELLS. PRIMARY
THREATS ARE EXPECTED TO BE LARGE HAIL AND DAMAGING WINDS.
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 24020.
..EVANS
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