Tornado Watch 402

Issued

May 30, 2011, 2:08 PM CDT (19:08 UTC)

Expired

May 30, 2011, 9:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

65 kt

The Sioux Falls radar (KFSD), 164 km from the middle of the area, began a volume at 19:09 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Two or more tornadoes

40%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

70%

One or more gusts of 65 knots or more

40%

Ten or more severe hail reports

70%

One or more hailstones of 2 inches or more

40%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 1029May 30, 1:40 PM CDT
• Mesoscale Discussion 1033May 30, 5:47 PM CDT
• Mesoscale Discussion 1034May 30, 6:17 PM CDT
• Mesoscale Discussion 1035May 30, 8:13 PM CDT

369 
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

Tornado Watches in Nebraska, 2011Tornado Watches in South Dakota, 2011Tornado Watches in Minnesota, 2011Every tornado watch in 2011

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.