Alert archive / North Dakota / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 135, NWS Grand Forks, ND

July 30, 2026Cass County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 30, 2026, 1:30 PM CDT for Cass County, North Dakota. It was in force for 60 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
Jul 30, 2026, 1:30 PM CDT (18:30 UTC)
Expired
Jul 30, 2026, 2:30 PM CDT
In force
60 min
Issued by
NWS Grand Forks, ND
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Cass County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 66 km from the middle of the area, began a volume at 18:33 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

International Fa, MN (KINL), launched 12:00Z, 6.5 hours before the alert went out and 347 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, International Fa, MN at 12:00Z on 2026-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2262 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, International Fa, MN at 12:00Z on 2026-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 242 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
2262 J/kg
Mixed-layer CIN
-152 J/kg
Mixed-layer LCL
933 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
242 m²/s²
0-3 km storm-relative helicity
280 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.2

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 Grand Forks, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 30, 12:17 PM CDT, 1 hour 13 minutes earlier.

Area forecast discussion, Jul 30, 12:17 PM CDT, 1 hour 13 minutes before
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Hazardous weather outlook, Jul 30, 1:22 PM CDT, 8 minutes before
Hazardous Weather Outlook
National Weather Service Grand Forks ND
122 PM CDT Thu Jul 30 2026

MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052>054-311830-
West Polk-Norman-Clay-Kittson-Roseau-Lake Of The Woods-
West Marshall-East Marshall-North Beltrami-Pennington-Red Lake-
East Polk-North Clearwater-South Beltrami-Mahnomen-
South Clearwater-Hubbard-West Becker-East Becker-Wilkin-
West Otter Tail-East Otter Tail-Wadena-Grant-Towner-Cavalier-
Pembina-Benson-Ramsey-Eastern Walsh-Eddy-Nelson-Grand Forks-
Griggs-Steele-Traill-Barnes-Cass-Ransom-Sargent-Richland-
Western Walsh-
122 PM CDT Thu Jul 30 2026

This hazardous weather outlook is for portions of eastern North
Dakota, west central and northwest Minnesota.

.DAY ONE...This Afternoon and Tonight

There is a level 1 out of 5 risk for severe storms this
afternoon, with the main hazard wind gusts to 60 mph and hail up
to 1 inch. Locally heavy rainfall may also lead to minor flooding.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

There is a low chance for strong thunderstorms Monday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be required today.

In the hours before

Special weather statement, Jul 30, 8:26 AM CDT, 5 hours 4 minutes before
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Special weather statement, Jul 30, 9:06 AM CDT, 4 hours 24 minutes before
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Special weather statement, Jul 30, 12:29 PM CDT, 1 hour 1 minute before
Special Weather Statement
National Weather Service Grand Forks ND
1229 PM CDT Thu Jul 30 2026

NDZ026-027-301800-
Nelson ND-Grand Forks ND-
1229 PM CDT Thu Jul 30 2026

...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN GRAND FORKS AND
NORTHEASTERN NELSON COUNTIES THROUGH 100 PM CDT...

At 1229 PM CDT, Doppler radar was tracking a strong thunderstorm near
Niagara, or 35 miles southwest of Grafton, moving northeast at 20
mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Petersburg, Niagara, McCanna, and Orr.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4806 9809 4820 9780 4819 9778 4797 9755
      4788 9793
TIME...MOT...LOC 1729Z 237DEG 18KT 4803 9793

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

TG
Special weather statement, Jul 30, 1:15 PM CDT, 15 minutes before
Special Weather Statement
National Weather Service Grand Forks ND
115 PM CDT Thu Jul 30 2026

NDZ039-049-301845-
Ransom ND-Cass ND-
115 PM CDT Thu Jul 30 2026

...STRONG THUNDERSTORMS WILL IMPACT NORTHWESTERN RANSOM AND
SOUTHEASTERN CASS COUNTIES THROUGH 145 PM CDT...

At 115 PM CDT, Doppler radar was tracking a cluster of strong
thunderstorms along a line extending from near Prosper to near Fort
Ransom. These storms were nearly stationary.

HAZARD...Wind gusts up to 50 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Southwestern Fargo, West Fargo, Horace, Casselton, Lisbon, Enderlin,
and Mapleton.

This includes Interstate 94 in North Dakota between mile markers 320
and 348.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4628 9803 4652 9803 4663 9775 4663 9768
      4667 9768 4689 9744 4713 9701 4692 9689
      4673 9684 4665 9705 4663 9728
TIME...MOT...LOC 1815Z 223DEG 2KT 4695 9695 4646 9797

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

TG

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 7:22 AM CDTSpecial Weather StatementFGFMarshall23 min
Jul 30, 4:19 PM CDTSevere Thunderstorm WarningFGFPolk56 min
Jul 30, 5:02 PM CDTFlash Flood WarningFGFPolk3 hr
Jul 30, 5:16 PM CDTAreal Flood AdvisoryFGFBeltrami, Pennington3 hr
Jul 30, 8:26 AM CDTSpecial Weather StatementFGFBenson49 min
Jul 30, 9:06 AM CDTSpecial Weather StatementFGFBenson24 min
Jul 30, 12:29 PM CDTSpecial Weather StatementFGFGrand Forks31 min
Jul 30, 1:15 PM CDTSpecial Weather StatementFGFCass30 min
Jul 30, 2:02 PM CDTAreal Flood AdvisoryFGFCass117 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.