Alert archive / North Dakota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 267, NWS Bismarck, ND

August 14, 2020Grant County, Morton County, Sioux County, North Dakota

NWS Bismarck, ND issued this severe thunderstorm warning at Aug 14, 2020, 4:02 AM MDT for Grant County, Morton County, Sioux County, North Dakota. It was in force for 58 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 14, 2020, 4:02 AM MDT (10:02 UTC)
Expired
Aug 14, 2020, 5:00 AM MDT
In force
58 min
Issued by
NWS Bismarck, ND
Area
Storm-based polygon
Hail
1.25 in
Wind
70.0 mph

Counties Grant County, ND, Morton County, ND, Sioux County, ND

The radar

The Bismarck radar (KBIS), 60 km from the middle of the area, began a volume at 10:05 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 13, 11:50 PM MDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 10.0 hours before the alert went out and 63 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 00:00Z on 2020-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1198 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Bismarck Municip, ND at 00:00Z on 2020-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -28 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
1198 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
2203 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
-28 m²/s²
0-3 km storm-relative helicity
77 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Bismarck, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 14, 3:23 AM MDT, 39 minutes earlier.

Area forecast discussion, Aug 14, 3:23 AM MDT, 39 minutes before
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Hazardous weather outlook, Aug 14, 3:55 AM MDT, 7 minutes before
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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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In the hours before

Local storm report, Aug 13, 11:20 PM MDT, 4 hours 42 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
1220 AM CDT FRI AUG 14 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1205 AM     TSTM WND GST     3 NW SUNSET BUTTE       46.17N 103.85W
08/14/2020  M66 MPH          BOWMAN             ND   MESONET

            SUNNY SLOPE NDAWN SITE RECORDED A 66 MPH
            WIND GUST.

&&

AJ
Local storm report, Aug 13, 11:51 PM MDT, 4 hours 11 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
1251 AM CDT FRI AUG 14 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1236 AM     TSTM WND GST     4 SE GRIFFIN            46.19N 103.48W
08/14/2020  M64 MPH          BOWMAN             ND   MESONET

            BOWMAN NDAWN STATION REPORTED A 64 MPH WIND
            GUST.

&&

AJ
Local storm report, Aug 14, 12:03 AM MDT, 3 hours 59 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
103 AM CDT FRI AUG 14 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1243 AM     TSTM WND GST     3 WSW BUFFALO SPRINGS   46.17N 103.30W
08/14/2020  M59 MPH          BOWMAN             ND   AWOS

            PEAK GUST AT BOWMAN AIRPORT. SUSTAINED WINDS
            OF 46 MPH.

&&
Local storm report, Aug 14, 12:27 AM MDT, 3 hours 35 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
127 AM CDT FRI AUG 14 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0117 AM     TSTM WND GST     8 SW HAVELOCK           46.40N 102.87W
08/14/2020  E75 MPH          HETTINGER          ND   PUBLIC

            ALSO QUARTER SIZE HAIL.

&&

AJ
Local storm report, Aug 14, 1:15 AM MDT, 2 hours 47 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
215 AM CDT FRI AUG 14 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0140 AM     HAIL             4 N HETTINGER           46.06N 102.65W
08/14/2020  M1.00 INCH       ADAMS              ND   PUBLIC

&&

AJ
Local storm report, Aug 14, 1:49 AM MDT, 2 hours 13 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
249 AM CDT FRI AUG 14 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0245 AM     HAIL             HETTINGER               46.00N 102.64W
08/14/2020  M1.25 INCH       ADAMS              ND   TRAINED SPOTTER

            LOTS OF NICKEL SIZE HAIL. ONLY A FEW
            HALF-DOLLARS.

&&

The office that day

Everything else NWS Bismarck, ND issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 13, 10:50 PM MDTSevere Thunderstorm WarningBISBowman, Slope55 min
Aug 13, 11:43 PM MDTSevere Thunderstorm WarningBISAdams, Bowman, Hettinger, Slope, Stark62 min
Aug 14, 12:42 AM MDTSevere Thunderstorm WarningBISAdams, Grant, Hettinger, Morton, Sioux63 min
Aug 14, 1:18 AM MDTSevere Thunderstorm WarningBISAdams42 min
Aug 14, 1:48 AM MDTSevere Thunderstorm WarningBISGrant42 min
Aug 14, 3:24 AM MDTDense Fog AdvisoryBISDickey, Foster, LaMoure, Pierce, Rolette, Stutsman and 1 more4 hr
Aug 14, 3:26 AM MDTSevere Thunderstorm WarningBISAdams, Grant, Hettinger, Sioux64 min
Aug 14, 3:41 AM MDTSevere Thunderstorm WarningBISEmmons, Logan64 min
Aug 14, 4:33 AM MDTSevere Thunderstorm WarningBISLogan, Stutsman57 min
Aug 14, 4:46 AM MDTSevere Thunderstorm WarningBISBurleigh, Emmons, Morton, Sioux59 min
Aug 14, 5:18 AM MDTSevere Thunderstorm WarningBISLaMoure, Logan, Stutsman57 min
Aug 14, 5:34 AM MDTSevere Thunderstorm WarningBISEmmons, Kidder, Logan41 min
Aug 14, 6:55 AM MDTSpecial Weather StatementBISDickey, LaMoure, McIntosh, Stutsman50 min
Aug 14, 7:47 AM MDTSpecial Weather StatementBISLaMoure28 min
Aug 14, 3:24 PM MDTSpecial Weather StatementBISRenville51 min
Aug 14, 4:01 PM MDTSpecial Weather StatementBISRenville29 min
Aug 14, 4:28 PM MDTSevere Thunderstorm WarningBISBottineau, Renville62 min
Aug 14, 5:19 PM MDTSevere Thunderstorm WarningBISMcHenry, Ward56 min
Aug 14, 5:34 PM MDTSevere Thunderstorm WarningBISMcHenry, McLean, Ward56 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 2020Every severe thunderstorm warning in 2020

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.