Tornado Watch 406

Issued

Jul 12, 2015, 5:28 PM CDT (22:28 UTC)

Expired

Jul 12, 2015, 10:05 PM CDT

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

3 in

Strongest gust expected

70 kt

The Minneapolis radar (KMPX), 107 km from the middle of the area, began a volume at 22:30 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

80%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

40%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 1378Jul 12, 2:54 PM CDT
• Mesoscale Discussion 1379Jul 12, 3:53 PM CDT
• Mesoscale Discussion 1381Jul 12, 5:53 PM CDT
• Mesoscale Discussion 1382Jul 12, 7:51 PM CDT
• Mesoscale Discussion 1383Jul 12, 8:16 PM CDT
• Mesoscale Discussion 1385Jul 12, 9:41 PM CDT

990 
WWUS20 KWNS 122226
SEL6  
SPC WW 122226
IAZ000-MNZ000-SDZ000-WIZ000-130600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 406
NWS STORM PREDICTION CENTER NORMAN OK
520 PM CDT SUN JUL 12 2015

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  NORTHWESTERN AND NORTH-CENTRAL IOWA
  CENTRAL AND SOUTHERN MINNESOTA
  EXTREME EASTERN SOUTH DAKOTA
  EXTREME WESTERN WISCONSIN

* EFFECTIVE THIS SUNDAY AFTERNOON AND MONDAY MORNING FROM 520 PM
  UNTIL 100 AM CDT.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES POSSIBLE
  WIDESPREAD DAMAGING WINDS LIKELY WITH ISOLATED SIGNIFICANT GUSTS
    TO 80 MPH POSSIBLE
  SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 3
    INCHES IN DIAMETER POSSIBLE

SUMMARY...COMBINATION OF:
1. EXISTING SEVERE THUNDERSTORMS IN THE SOUTHERN PART OF SPC WATCH
405 AND
2. ADDITIONAL DEVELOPMENT OVER NORTHEASTERN SOUTH DAKOTA
...IS EXPECTED TO RESULT IN AN INITIAL THREAT OF SUPERCELLS FROM
THOSE AREAS INTO WESTERN MINNESOTA.  DAMAGING HAIL...SEVERE GUSTS
AND A FEW TORNADOES ARE EXPECTED.  WITH TIME...STORMS SHOULD MERGE
AND GROW INTO A LARGE BOWING COMPLEX...OFFERING MAINLY DAMAGING
WIND...WITH SOME GUSTS LOCALLY REACHING HURRICANE FORCE.  SUCH
STORMS STILL MAY POSE A RISK OF A TORNADO OR TWO AS WELL AS ISOLATED
LARGE HAIL...AS THEY CROSS MUCH OF SOUTHERN MINNESOTA AND EVENTUALLY
PARTS OF WESTERN WISCONSIN AND NORTHERN IOWA.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 120 STATUTE
MILES EITHER SIDE OF A LINE FROM 15 MILES NORTH NORTHEAST OF
ALEXANDRIA MINNESOTA TO 60 MILES SOUTHWEST OF ROCHESTER
MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 405...

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
650. MEAN STORM MOTION VECTOR 30030.


...EDWARDS

Tornado Watches in Minnesota, 2015Tornado Watches in Iowa, 2015Tornado Watches in South Dakota, 2015Every tornado watch in 2015

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.