Alert archive / North Dakota / Tornado Watches in 2016

Tornado Watch 430

August 3, 20169 counties in Minnesota; 40 counties in North Dakota

The Storm Prediction Center issued this tornado watch at Aug 3, 2016, 3:38 PM CDT for 9 counties in Minnesota; 40 counties in North Dakota. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Aug 3, 2016, 3:38 PM CDT (20:38 UTC)
Expired
Aug 3, 2016, 11:00 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
60 kt
All 49 counties

Clay County, MN, Kittson County, MN, Marshall County, MN, Norman County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Roseau County, MN, Wilkin County, MN, Barnes County, ND, Benson County, ND, Bottineau County, ND, Burleigh County, ND, Cass County, ND, Cavalier County, ND, Dickey County, ND, Eddy County, ND, Emmons County, ND, Foster County, ND, Grand Forks County, ND, Grant County, ND, Griggs County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McHenry County, ND, McIntosh County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Nelson County, ND, Oliver County, ND, Pembina County, ND, Pierce County, ND, Ramsey County, ND, Ransom County, ND, Renville County, ND, Richland County, ND, Rolette County, ND, Sargent County, ND, Sheridan County, ND, Sioux County, ND, Steele County, ND, Stutsman County, ND, Towner County, ND, Traill County, ND, Walsh County, ND, Ward County, ND, Wells County, ND

The radar

The Minot AFB radar (KMBX), 134 km from the middle of the area, began a volume at 20:39 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

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
10%
Ten or more severe hail reports
90%
One or more hailstones of 2 inches or more
50%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

27 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Aug 3, 3:54 PM CDTSevere Thunderstorm WarningBISBottineau, Rolette66 min
Aug 3, 3:58 PM CDTSevere Thunderstorm WarningBISPierce, Rolette62 min
Aug 3, 4:23 PM CDTSevere Thunderstorm WarningBISRolette67 min
Aug 3, 4:30 PM CDTSevere Thunderstorm WarningFGFBenson, Towner60 min
Aug 3, 5:00 PM CDTSevere Thunderstorm WarningBISPierce, Rolette60 min
Aug 3, 5:17 PM CDTSevere Thunderstorm WarningFGFCavalier, Towner58 min
Aug 3, 5:31 PM CDTTornado WarningBISRolette19 min
Aug 3, 5:31 PM CDTTornado WarningFGFTowner44 min
Aug 3, 5:58 PM CDTSevere Thunderstorm WarningBISPierce, Rolette45 min
Aug 3, 6:14 PM CDTTornado WarningFGFCavalier, Towner46 min
Aug 3, 6:43 PM CDTTornado WarningFGFCavalier, Towner47 min
Aug 3, 6:48 PM CDTSevere Thunderstorm WarningFGFBenson, Cavalier, Ramsey, Towner42 min
Aug 3, 7:04 PM CDTFlash Flood WarningFGFTowner3 hr
Aug 3, 7:15 PM CDTSevere Thunderstorm WarningFGFCavalier, Pembina, Ramsey, Walsh60 min
Aug 3, 7:29 PM CDTSevere Thunderstorm WarningFGFBenson, Cavalier, Ramsey, Towner, Walsh46 min
Aug 3, 7:38 PM CDTSevere Thunderstorm WarningFGFBenson, Ramsey52 min
Aug 3, 7:55 PM CDTSevere Thunderstorm WarningFGFKittson, Marshall, Roseau65 min
Aug 3, 8:14 PM CDTSevere Thunderstorm WarningFGFRamsey61 min
Aug 3, 8:19 PM CDTTornado WarningFGFRamsey41 min
Aug 3, 8:24 PM CDTTornado WarningFGFBenson, Eddy51 min
Aug 3, 9:13 PM CDTTornado WarningFGFEddy, Nelson47 min
Aug 3, 9:48 PM CDTSevere Thunderstorm WarningBISMcIntosh57 min
Aug 3, 9:54 PM CDTSevere Thunderstorm WarningFGFGrand Forks, Griggs, Nelson, Steele20 min
Aug 3, 9:58 PM CDTSevere Thunderstorm WarningBISLaMoure, Logan62 min
Aug 3, 10:05 PM CDTTornado WarningBISMcIntosh25 min
Aug 3, 10:12 PM CDTSevere Thunderstorm WarningFGFGriggs, Steele48 min
Aug 3, 10:29 PM CDTSevere Thunderstorm WarningFGFBeltrami, Clearwater, Marshall, Pennington, Polk, Red Lake61 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 8.6 hours before the alert went out and 151 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Bismarck Municip, ND at 12:00Z on 2016-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 58 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Bismarck Municip, ND at 12:00Z on 2016-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
58 J/kg
Mixed-layer CIN
-522 J/kg
Mixed-layer LCL
1927 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
150 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

867 
WWUS20 KWNS 032034
SEL0  
SPC WW 032034
MNZ000-NDZ000-040400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 430
NWS STORM PREDICTION CENTER NORMAN OK
335 PM CDT WED AUG 3 2016

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  NORTHWEST MINNESOTA
  CENTRAL AND EASTERN NORTH DAKOTA

* EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 335 PM
  UNTIL 1100 PM CDT.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES POSSIBLE
  WIDESPREAD LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL
    EVENTS TO 3 INCHES IN DIAMETER POSSIBLE
  SCATTERED DAMAGING WIND GUSTS TO 70 MPH LIKELY

SUMMARY...THUNDERSTORMS ARE EXPECTED TO FORM RAPIDLY THIS AFTERNOON
OVER CENTRAL ND AND TRACK EASTWARD ACROSS THE WATCH AREA.  VERY
LARGE HAIL WILL BE POSSIBLE IN THE STRONGEST STORMS...ALONG WITH A
FEW TORNADOES AND DAMAGING WINDS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 135 STATUTE
MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH NORTHEAST OF
DEVILS LAKE NORTH DAKOTA TO 75 MILES SOUTH SOUTHWEST OF JAMESTOWN
NORTH DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

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.

&&

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 27030.


...HART

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 3, 2:52 PM CDTMesoscale DiscussionSPCBenson, Bottineau, Burleigh, Cavalier, Eddy, Emmons and 22 more53 min
Aug 3, 6:29 PM CDTMesoscale DiscussionSPCBarnes, Benson, Burleigh, Cass, Cavalier, Dickey and 23 more91 min

Nearby

Tornado Watches in North Dakota, 2016Tornado Watches in Minnesota, 2016Every tornado watch in 2016

Sources

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.