Severe Thunderstorm Watch 430

Issued

Jul 17, 2015, 3:43 PM CDT (20:43 UTC)

Expired

Jul 17, 2015, 11:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Aberdeen radar (KABR), 88 km from the middle of the area, began a volume at 20:46 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

20%

One or more EF2 to EF5 tornadoes

2%

Ten or more severe wind reports

40%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

40%

Six or more combined severe hail and wind reports

60%

• Mesoscale Discussion 1446Jul 17, 1:10 PM CDT
• Mesoscale Discussion 1448Jul 17, 3:36 PM CDT
• Mesoscale Discussion 1453Jul 17, 6:02 PM CDT
• Mesoscale Discussion 1454Jul 17, 7:18 PM CDT
• Mesoscale Discussion 1456Jul 17, 9:55 PM CDT

558 
WWUS20 KWNS 172042
SEL0  
SPC WW 172042
MNZ000-NDZ000-SDZ000-180400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 430
NWS STORM PREDICTION CENTER NORMAN OK
340 PM CDT FRI JUL 17 2015

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
  WESTERN MINNESOTA
  SOUTHERN AND EASTERN NORTH DAKOTA
  NORTHERN AND EASTERN SOUTH DAKOTA

* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 340 PM UNTIL
  1100 PM CDT.

* PRIMARY THREATS INCLUDE...
  SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2
    INCHES IN DIAMETER POSSIBLE
  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
  A TORNADO OR TWO POSSIBLE

SUMMARY...THUNDERSTORMS EXPECTED TO FORM LATER THIS AFTERNOON
THROUGH THIS EVENING ALONG...AHEAD...AND POSSIBLY BEHIND
SLOWLY-MOVING COLD FRONT NOW EXTENDING FROM EASTERN ND INTO CENTRAL
SD. A FEW SUPERCELLS MAY OCCUR...POSING A RISK FOR LARGE
HAIL...DAMAGING WIND...AND POSSIBLY A COUPLE TORNADOES. THE ACTIVITY
MAY MERGE INTO AN EAST-MOVING CLUSTER OR TWO EARLY TONIGHT.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH
NORTHWEST OF FARGO NORTH DAKOTA TO 15 MILES SOUTHWEST OF HURON
SOUTH DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

&&

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 27025.


...CORFIDI

Severe Thunderstorm Watches in South Dakota, 2015Severe Thunderstorm Watches in North Dakota, 2015Severe Thunderstorm Watches in Minnesota, 2015Every severe thunderstorm 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.