SEL5
SPC WW 082313
NDZ000-NEZ000-SDZ000-090600-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 265
NWS STORM PREDICTION CENTER NORMAN OK
615 PM CDT SUN MAY 8 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTH CENTRAL NORTH DAKOTA
NORTHERN NEBRASKA
CENTRAL SOUTH DAKOTA
EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 615 PM UNTIL
100 AM CDT.
TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES WEST NORTHWEST OF
BISMARCK NORTH DAKOTA TO 20 MILES EAST SOUTHEAST OF BURWELL
NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).
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.
DISCUSSION...ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED TO
FORM THIS EVENING ALONG THE INSTABILITY AXIS EXTENDING FROM NORTHERN
NEB INTO SOUTH CENTRAL ND. WEAKENING INHIBITION AND WEAK LOW LEVEL
WARM ADVECTION WILL HELP INITIATION. THOSE STORMS THAT FORM WILL BE
IN ENVIRONMENT OF FAVORABLE LOW LEVEL AND DEEP LAYER VERTICAL SHEAR
TO BECOME SLOW-MOVING SUPERCELLS CAPABLE OF VERY LARGE HAIL AND
DAMAGING WINDS. ISOLATED TORNADOES WILL ALSO BE POSSIBLE.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 27015.
...HART
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