Tornado Watch 406

Issued

May 30, 2011, 8:43 PM CDT (01:43 UTC)

Expired

May 31, 2011, 2:00 AM CDT

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

70 kt

The Aberdeen radar (KABR), 176 km from the middle of the area, began a volume at 01:46 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

50%

One or more EF2 to EF5 tornadoes

30%

Ten or more severe wind reports

80%

One or more gusts of 65 knots or more

70%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 1034May 30, 6:17 PM CDT
• Mesoscale Discussion 1036May 30, 10:09 PM CDT

213 
WWUS20 KWNS 310146
SEL6
SPC WW 310146
IAZ000-MNZ000-NDZ000-SDZ000-310700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 406
NWS STORM PREDICTION CENTER NORMAN OK
845 PM CDT MON MAY 30 2011

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

       NORTHWESTERN IOWA
       WESTERN...CENTRAL AND NORTHERN MINNESOTA
       EXTREME EASTERN NORTH DAKOTA
       EASTERN SOUTH DAKOTA

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 845 PM UNTIL
200 AM CDT.

TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTH SOUTHEAST OF
SIOUX FALLS SOUTH DAKOTA TO 70 MILES NORTHEAST OF THIEF RIVER
FALLS MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).

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.

OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 402...TORNADO WATCH NUMBER 403. WATCH NUMBER 402 403
WILL NOT BE IN EFFECT AFTER 845 PM CDT. CONTINUE...WW 405...

DISCUSSION...THREAT WILL SHIFT NEWD ACROSS WW AREA THROUGH REMAINDER
EVENING FOR BOTH SIGNIFICANT CONVECTIVE WIND DAMAGE AND TORNADOES.
TORNADO POTENTIAL MAY EXIST EITHER WITH EMBEDDED
SUPERCELLS...BOW-ECHO MESOCIRCULATIONS OR LEADING-EDGE/QLCS SPINUPS.
 WARM SECTOR WILL SPREAD OVER MORE OF NRN MN WITH TIME...AHEAD OF
MCS...LEADING TO DESTABILIZATION OF NEAR-SFC AIR MASS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 22040.


...EDWARDS/HALES

Tornado Watches in Minnesota, 2011Tornado Watches in South Dakota, 2011Tornado Watches in Iowa, 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.