Tornado Watch 617

Issued

Jul 10, 2011, 2:29 PM CDT (19:29 UTC)

Expired

Jul 10, 2011, 9:13 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

3 in

Strongest gust expected

70 kt

The Aberdeen radar (KABR), 68 km from the middle of the area, began a volume at 19:32 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

20%

Ten or more severe wind reports

60%

One or more gusts of 65 knots or more

40%

Ten or more severe hail reports

60%

One or more hailstones of 2 inches or more

50%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 1558Jul 10, 10:32 AM CDT
• Mesoscale Discussion 1559Jul 10, 2:08 PM CDT
• Mesoscale Discussion 1562Jul 10, 5:25 PM CDT

132 
WWUS20 KWNS 101929
SEL7
SPC WW 101929
MNZ000-NDZ000-SDZ000-110300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 617
NWS STORM PREDICTION CENTER NORMAN OK
230 PM CDT SUN JUL 10 2011

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

       WEST CENTRAL MINNESOTA
       SOUTHEAST NORTH DAKOTA
       NORTHERN SOUTH DAKOTA

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 230 PM UNTIL
1000 PM CDT.

TORNADOES...HAIL TO 3 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 70 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 20 MILES NORTH OF MOBRIDGE
SOUTH DAKOTA TO 40 MILES NORTH NORTHEAST OF ORTONVILLE MINNESOTA.
 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU7).

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...CONTINUE...WW 616...

DISCUSSION...INTENSE THUNDERSTORMS CONTINUE TO STRENGTHEN OVER
SOUTHERN ND.  OTHER STORMS MAY FORM IN THE NEXT FEW HOURS OVER
NORTHERN SD.  THIS ACTIVITY WILL PROGRESS EASTWARD ACROSS THE WATCH
AREA THROUGH THE AFTERNOON AND EARLY EVENING.  LOW LEVEL FLOW IS NOT
PARTICULARLY STRONG.  HOWEVER...CONSIDERABLE VEERING OF WINDS WITH
HEIGHT...STRONG INSTABILITY...FAVORABLE DEEP LAYER SHEAR...AND
STRONG SUPERCELL STRUCTURES ON RADAR WARRANT RISK OF A FEW
TORNADOES.  VERY LARGE HAIL AND DAMAGING WINDS ARE ALSO A CONCERN.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 28035.


...HART

Tornado Watches in South Dakota, 2011Tornado Watches in North 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.