Alert archive / North Dakota / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 274, NWS Bismarck, ND

August 11, 2026Morton County, North Dakota

NWS Bismarck, ND issued this severe thunderstorm warning at Aug 11, 2026, 10:06 PM CDT for Morton County, North Dakota. It was in force for 24 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 11, 2026, 10:06 PM CDT (03:06 UTC)
Expired
Aug 11, 2026, 10:30 PM CDT
In force
24 min
Issued by
NWS Bismarck, ND
Area
Storm-based polygon
Damage threat
Considerable
Hail
1.75 in
Wind
60.0 mph

County Morton County, ND

The radar

The Bismarck radar (KBIS), 40 km from the middle of the area, began a volume at 03:06 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 11, 5:40 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 3.1 hours before the alert went out and 301 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, Aberdeen, SD at 00:00Z on 2026-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2509 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, Aberdeen, SD at 00:00Z on 2026-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 square meters per square second.19395878Sfc1 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
2509 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
1105 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
16 m²/s²
0-3 km storm-relative helicity
-14 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.2

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 11, 7:10 PM CDTSevere Thunderstorm Warning Considerable damage threatBISBillings, Dunn, Stark65 min
Aug 11, 7:13 PM CDTSevere Thunderstorm Warning Considerable damage threatBISBillings, Hettinger, Slope, Stark62 min
Aug 11, 7:26 PM CDTSevere Thunderstorm Warning Considerable damage threatBISAdams, Bowman, Slope49 min
Aug 11, 7:30 PM CDTSevere Thunderstorm Warning Considerable damage threatBISGrant, Hettinger60 min
Aug 11, 7:41 PM CDTSevere Thunderstorm Warning Considerable damage threatBISMorton49 min
Aug 11, 7:53 PM CDTSevere Thunderstorm Warning Considerable damage threatBISHettinger33 min
Aug 11, 8:07 PM CDTSevere Thunderstorm Warning Considerable damage threatBISGrant, Morton, Sioux53 min
Aug 11, 8:21 PM CDTSevere Thunderstorm WarningBISAdams, Grant, Sioux39 min
Aug 11, 8:25 PM CDTSpecial Weather StatementBISBurleigh35 min
Aug 11, 8:46 PM CDTSevere Thunderstorm Warning Destructive damage threatBISEmmons, Sioux59 min
Aug 11, 8:55 PM CDTSevere Thunderstorm Warning Considerable damage threatBISAdams, Grant, Sioux36 min
Aug 11, 8:57 PM CDTSpecial Weather StatementBISBurleigh33 min
Aug 11, 9:15 PM CDTSevere Thunderstorm WarningBISGrant, Morton45 min
Aug 11, 9:29 PM CDTSevere Thunderstorm WarningBISAdams31 min
Aug 11, 9:49 PM CDTSevere Thunderstorm Warning Considerable damage threatBISMorton41 min
Aug 11, 10:20 PM CDTSevere Thunderstorm Warning Considerable damage threatBISBurleigh, Emmons, Morton55 min
Aug 11, 10:27 PM CDTSevere Thunderstorm WarningBISEmmons, Logan50 min
Aug 11, 10:48 PM CDTSevere Thunderstorm WarningBISBurleigh, Kidder, Logan57 min
Aug 11, 11:08 PM CDTSevere Thunderstorm WarningBISBurleigh67 min
Aug 11, 11:32 PM CDTSevere Thunderstorm WarningBISKidder58 min
Aug 11, 11:42 PM CDTSpecial Weather StatementBISLogan33 min
Aug 11, 11:53 PM CDTSevere Thunderstorm WarningBISKidder, Stutsman53 min
Aug 12, 12:27 AM CDTSpecial Weather StatementBISAdams33 min
Aug 12, 12:29 AM CDTSpecial Weather StatementBISStutsman31 min
Aug 12, 12:58 AM CDTSpecial Weather StatementBISStutsman47 min
Aug 12, 2:25 AM CDTSpecial Weather StatementBISEmmons35 min
Aug 12, 3:51 PM CDTSpecial Weather StatementBISEmmons24 min
Aug 12, 3:59 PM CDTSpecial Weather StatementBISAdams31 min
Aug 12, 4:15 PM CDTSpecial Weather StatementBISEmmons30 min
Aug 12, 4:46 PM CDTSpecial Weather StatementBISLogan29 min
Aug 12, 5:13 PM CDTSpecial Weather StatementBISLogan32 min
Aug 12, 5:29 PM CDTSevere Thunderstorm WarningBISKidder, Logan, Stutsman46 min
Aug 12, 5:54 PM CDTSevere Thunderstorm WarningBISMcIntosh30 min

Nearby

Severe Thunderstorm Warnings in North Dakota, 2026Every severe thunderstorm warning in 2026

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.