Alert archive / North Dakota / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 270, NWS Bismarck, ND

September 12, 2025Bottineau County, Rolette County, North Dakota

NWS Bismarck, ND issued this severe thunderstorm warning at Sep 12, 2025, 12:33 AM CDT for Bottineau County, Rolette County, North Dakota. It was in force for 39 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: Sep 12, 2025, 12:33 AM CDT (05:33 UTC)
Expired: Sep 12, 2025, 1:12 AM CDT
In force: 39 min
Issued by: NWS Bismarck, ND
Area: Storm-based polygon
Hail: 1.25 in
Wind: 50.0 mph

Counties Bottineau County, ND, Rolette County, ND

The radar

The Minot AFB radar (KMBX), 58 km from the middle of the area, began a volume at 05:33 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 nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 5.6 hours before the alert went out and 225 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2247 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 1692 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 10.3

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 Sep 11, 10:16 PM CDT, 2 hours 17 minutes earlier.

Area forecast discussion, Sep 11, 10:16 PM CDT, 2 hours 17 minutes before

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Hazardous weather outlook, Sep 11, 10:17 PM CDT, 2 hours 16 minutes before

Hazardous Weather Outlook
National Weather Service Bismarck ND
1017 PM CDT Thu Sep 11 2025

NDZ001>005-009>013-017>023-025-031>037-040>048-050-051-130330-
Divide-Burke-Renville-Bottineau-Rolette-Williams-Mountrail-Ward-
McHenry-Pierce-McKenzie-Dunn-Mercer-Oliver-McLean-Sheridan-Wells-
Foster-Golden Valley-Billings-Stark-Morton-Burleigh-Kidder-
Stutsman-Slope-Hettinger-Grant-Bowman-Adams-Sioux-Emmons-Logan-
La Moure-McIntosh-Dickey-
1017 PM CDT Thu Sep 11 2025 /917 PM MDT Thu Sep 11 2025/

This Hazardous Weather Outlook is for portions of north central
North Dakota, northwest North Dakota, south central North Dakota,
southeast North Dakota, and southwest North Dakota.

.DAY ONE...Tonight

Isolated to scattered thunderstorms are expected this afternoon
through tonight. A few storms may become severe, with hail as
large as ping pong balls and damaging winds up to 70 mph.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Isolated strong to severe thunderstorms are possible late Friday
afternoon through Friday night, and again Saturday afternoon
through Saturday night.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report severe weather to the National
Weather Service by calling 800-247-0212 or on our social media
pages.

In the hours before

Special weather statement, Sep 11, 9:26 PM CDT, 3 hours 7 minutes before

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Local storm report, Sep 11, 9:49 PM CDT, 2 hours 44 minutes before

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Local storm report, Sep 11, 9:51 PM CDT, 2 hours 42 minutes before

Preliminary Local Storm Report
National Weather Service Bismarck ND
951 PM CDT Thu Sep 11 2025

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

0930 PM     Hail             3 E Granville           48.27N 100.78W
09/11/2025  M1.25 Inch       McHenry            ND   Public

            Member of the public shared a photo of a
            hailstone estimated to be around the size of
            a half-dollar. Photo relayed on social
            media.

&&

JGA

Local storm report, Sep 11, 9:55 PM CDT, 2 hours 38 minutes before

Preliminary Local Storm Report
National Weather Service Bismarck ND
955 PM CDT Thu Sep 11 2025

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

0930 PM     Hail             Granville               48.27N 100.84W
09/11/2025  E1.25 Inch       McHenry            ND   Public

            Member of the public shares photo of
            hailstones estimated to be a quarter in
            size. Hail started around 9:30 and fell for
            approximately 15 minutes. Photo relayed on
            social media.

&&

JGA

Local storm report, Sep 11, 10:35 PM CDT, 1 hour 58 minutes before

Preliminary Local Storm Report
National Weather Service Bismarck ND
1035 PM CDT Thu Sep 11 2025

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

0927 PM     Hail             Granville               48.27N 100.84W
09/11/2025  M2.00 Inch       McHenry            ND   Public

            Broadcast media relays photo on social media
            of 2 inch hail near Granville.

&&

JGA

Local storm report, Sep 11, 10:36 PM CDT, 1 hour 57 minutes before

Preliminary Local Storm Report
National Weather Service Bismarck ND
1036 PM CDT Thu Sep 11 2025

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

0924 PM     Hail             Granville               48.27N 100.84W
09/11/2025  M1.00 Inch       McHenry            ND   Public

            Broadcast media relays photo on social media
            of quarter sized hail near Granville.

&&

JGA

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 11, 9:26 PM CDT	Special Weather Statement	BIS	McHenry	34 min
Sep 11, 9:41 PM CDT	Severe Thunderstorm Warning	BIS	McHenry	49 min
Sep 11, 10:18 PM CDT	Severe Thunderstorm Warning	BIS	McHenry	42 min
Sep 11, 10:20 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	McHenry, Pierce	55 min
Sep 11, 11:01 PM CDT	Severe Thunderstorm Warning	BIS	Bottineau, McHenry, Pierce	59 min
Sep 11, 11:46 PM CDT	Severe Thunderstorm Warning	BIS	McHenry, Pierce	44 min
Sep 12, 12:00 AM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	Bottineau, McHenry, Pierce, Rolette	45 min
Sep 12, 12:29 AM CDT	Severe Thunderstorm Warning	BIS	McHenry, Pierce	61 min
Sep 12, 12:41 AM CDT	Areal Flood Advisory	BIS	McHenry, Pierce	4 hr
Sep 12, 1:40 AM CDT	Flash Flood Warning	BIS	Pierce	3 hr
Sep 12, 5:12 AM CDT	Special Weather Statement	BIS	Dunn	33 min
Sep 12, 5:46 AM CDT	Special Weather Statement	BIS	Dunn	29 min
Sep 12, 7:18 AM CDT	Special Weather Statement	BIS	Pierce	42 min
Sep 12, 10:07 AM CDT	Special Weather Statement	BIS	Wells	38 min
Sep 12, 10:49 AM CDT	Special Weather Statement	BIS	Wells	26 min
Sep 12, 11:11 AM CDT	Special Weather Statement	BIS	Wells	34 min
Sep 12, 12:43 PM CDT	Special Weather Statement	BIS	Williams	32 min
Sep 12, 12:59 PM CDT	Tornado Warning Tornado observed	BIS	Williams	31 min
Sep 12, 1:41 PM CDT	Special Weather Statement	BIS	Burke	34 min
Sep 12, 2:12 PM CDT	Special Weather Statement	BIS	Burke	33 min
Sep 12, 4:10 PM CDT	Special Weather Statement	BIS	Bowman	35 min
Sep 12, 4:40 PM CDT	Severe Thunderstorm Warning	BIS	Bowman	39 min
Sep 12, 5:52 PM CDT	Severe Thunderstorm Warning	BIS	Morton, Sioux	38 min
Sep 12, 6:15 PM CDT	Severe Thunderstorm Warning	BIS	Grant	45 min
Sep 12, 6:24 PM CDT	Severe Thunderstorm Warning	BIS	Morton, Sioux	51 min
Sep 12, 6:39 PM CDT	Severe Thunderstorm Warning Considerable damage threat	BIS	Emmons, Sioux	51 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 2025 Every severe thunderstorm warning in 2025

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.