Alert archive / Montana / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 4, NWS Great Falls, MT

May 13, 2026Cascade County, Chouteau County, Teton County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at May 13, 2026, 2:50 PM MDT for Cascade County, Chouteau County, Teton County, Montana. It was in force for 40 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: May 13, 2026, 2:50 PM MDT (20:50 UTC)
Expired: May 13, 2026, 3:30 PM MDT
In force: 40 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Cascade County, MT, Chouteau County, MT, Teton County, MT

The radar

The Great Falls radar (KTFX), 24 km from the middle of the area, began a volume at 20:50 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.

Issued	Product	Office	Lasted
May 13, 12:50 PM MDT	Severe Thunderstorm Watch	SPC	8 hr

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 Great Falls, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at May 13, 1:51 PM MDT, 59 minutes earlier.

Area forecast discussion, May 13, 1:51 PM MDT, 59 minutes before

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In the hours before

Special weather statement, May 13, 2:31 PM MDT, 19 minutes before

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Special weather statement, May 13, 2:31 PM MDT, 19 minutes before

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Special weather statement, May 13, 2:33 PM MDT, 17 minutes before

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Local storm report, May 13, 2:37 PM MDT, 13 minutes before

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Local storm report, May 13, 2:38 PM MDT, 12 minutes before

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Local storm report, May 13, 2:41 PM MDT, 9 minutes before

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The office that day

Everything else NWS Great Falls, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 12, 11:48 PM MDT	High Wind Warning	TFX	Beaverhead, Blaine, Broadwater, Cascade, Chouteau, Fergus and 12 more	44 hr
May 13, 12:06 AM MDT	Winter Weather Advisory	TFX	Glacier, Pondera	35 hr
May 13, 12:59 PM MDT	Special Weather Statement	TFX	Madison	46 min
May 13, 1:59 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Lewis and Clark	35 min
May 13, 2:04 PM MDT	Special Weather Statement	TFX	Jefferson	41 min
May 13, 2:13 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Beaverhead, Madison	47 min
May 13, 2:31 PM MDT	Special Weather Statement	TFX	Judith Basin	29 min
May 13, 2:31 PM MDT	Special Weather Statement	TFX	Gallatin, Madison	44 min
May 13, 2:33 PM MDT	Special Weather Statement	TFX	Cascade	27 min
May 13, 2:46 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau, Fergus, Judith Basin	44 min
May 13, 2:59 PM MDT	Severe Thunderstorm Warning	TFX	Broadwater, Jefferson	46 min
May 13, 3:28 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Blaine, Cascade, Chouteau, Fergus, Hill, Judith Basin and 1 more	47 min
May 13, 3:36 PM MDT	Special Weather Statement	TFX	Beaverhead, Madison	54 min
May 13, 3:51 PM MDT	Special Weather Statement	TFX	Meagher	39 min
May 13, 4:08 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Blaine, Chouteau, Fergus, Hill, Liberty	97 min
May 13, 5:22 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	38 min

Nearby

Severe Thunderstorm Warnings in Montana, 2026 Every 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; radar from the NEXRAD Level II archive.