WATCHES: Tornado Watch Number 402

WWUS20 KWNS 301908
SEL2
SPC WW 301908
MNZ000-NEZ000-SDZ000-310200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 402
NWS STORM PREDICTION CENTER NORMAN OK
210 PM CDT MON MAY 30 2011

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

EXTREME SOUTHWEST MINNESOTA
CENTRAL AND NORTHEAST NEBRASKA
SOUTHEAST SOUTH DAKOTA

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 210 PM UNTIL 900
PM CDT.

TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH NORTHWEST OF
BROOKINGS SOUTH DAKOTA TO 40 MILES EAST SOUTHEAST OF MCCOOK
NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).

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...THUNDERSTORMS ARE EXPECTED TO DEVELOP SOON ALONG THE
COLD FRONT EXTENDING ACROSS CENTRAL NEB AND SOUTHEAST SD. THESE
STORMS WILL TRACK QUICKLY NORTHEASTWARD ACROSS THE WATCH AREA
THROUGH EARLY EVENING. INCREASINGLY STRONG SOUTHERLY LOW LEVEL
WINDS AHEAD OF THE STORMS AND MODERATE INSTABILITY WILL PROMOTE A
FEW SUPERCELL STORMS CAPABLE OF VERY LARGE HAIL AND TORNADOES.
OTHERWISE...EVOLUTION TO A SQUALL LINE IS EXPECTED WITH INCREASING
RISKS OF DAMAGING WINDS THROUGH THE EVENING.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 24040.

...HART

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