Alert archive / Montana / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 77, NWS Great Falls, MT

July 18, 2026Lewis and Clark County, Teton County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jul 18, 2026, 5:26 PM MDT for Lewis and Clark County, Teton County, Montana. It was in force for 64 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 18, 2026, 5:26 PM MDT (23:26 UTC)
Expired: Jul 18, 2026, 6:30 PM MDT
In force: 64 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Lewis and Clark County, MT, Teton County, MT

The radar

The Great Falls radar (KTFX), 70 km from the middle of the area, began a volume at 23:28 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
Jul 18, 3:39 PM MDT	Severe Thunderstorm Watch	SPC	6 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 Jul 18, 1:51 PM MDT, 3 hours 35 minutes earlier.

Area forecast discussion, Jul 18, 1:51 PM MDT, 3 hours 35 minutes before

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In the hours before

Special weather statement, Jul 18, 2:25 PM MDT, 3 hours 1 minute before

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Special weather statement, Jul 18, 4:01 PM MDT, 1 hour 25 minutes before

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Special weather statement, Jul 18, 4:21 PM MDT, 1 hour 5 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
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Special weather statement, Jul 18, 4:49 PM MDT, 37 minutes before

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Special weather statement, Jul 18, 4:49 PM MDT, 37 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Special weather statement, Jul 18, 5:09 PM MDT, 17 minutes before

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<body>
  <main class="wrap">
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      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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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
Jul 17, 6:25 PM MDT	Special Weather Statement	TFX	Jefferson	50 min
Jul 17, 6:41 PM MDT	Areal Flood Advisory	TFX	Jefferson	3 hr
Jul 17, 6:47 PM MDT	Special Weather Statement	TFX	Cascade	43 min
Jul 17, 6:58 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau, Teton	32 min
Jul 17, 7:08 PM MDT	Special Weather Statement	TFX	Broadwater	52 min
Jul 17, 7:26 PM MDT	Severe Thunderstorm Warning	TFX	Broadwater, Meagher	37 min
Jul 17, 8:00 PM MDT	Special Weather Statement	TFX	Meagher	45 min
Jul 17, 8:08 PM MDT	Special Weather Statement	TFX	Cascade	52 min
Jul 17, 8:33 PM MDT	Areal Flood Advisory	TFX	Broadwater, Meagher	3 hr
Jul 17, 8:35 PM MDT	Areal Flood Advisory	TFX	Cascade, Judith Basin	3 hr
Jul 17, 9:06 PM MDT	Flash Flood Warning	TFX	Broadwater, Lewis and Clark	4 hr
Jul 18, 1:46 PM MDT	Special Weather Statement	TFX	Beaverhead	44 min
Jul 18, 2:25 PM MDT	Special Weather Statement	TFX	Silver Bow	50 min
Jul 18, 2:32 PM MDT	Severe Thunderstorm Warning	TFX	Beaverhead, Jefferson, Madison	28 min
Jul 18, 2:53 PM MDT	Severe Thunderstorm Warning	TFX	Broadwater, Gallatin, Jefferson, Madison	67 min
Jul 18, 4:01 PM MDT	Special Weather Statement	TFX	Broadwater	59 min
Jul 18, 4:21 PM MDT	Special Weather Statement	TFX	Lewis and Clark	39 min
Jul 18, 4:49 PM MDT	Special Weather Statement	TFX	Beaverhead	56 min
Jul 18, 4:49 PM MDT	Special Weather Statement	TFX	Pondera	26 min
Jul 18, 5:00 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Lewis and Clark	45 min
Jul 18, 5:09 PM MDT	Special Weather Statement	TFX	Liberty, Pondera	66 min
Jul 18, 5:30 PM MDT	Severe Thunderstorm Warning	TFX	Liberty, Toole	60 min
Jul 18, 5:41 PM MDT	Special Weather Statement	TFX	Cascade	49 min
Jul 18, 5:44 PM MDT	Areal Flood Advisory	TFX	Liberty, Pondera, Toole	3 hr
Jul 18, 5:48 PM MDT	Severe Thunderstorm Warning	TFX	Pondera, Toole	57 min
Jul 18, 5:50 PM MDT	Special Weather Statement	TFX	Madison	55 min
Jul 18, 5:55 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Teton	35 min
Jul 18, 5:56 PM MDT	Special Weather Statement	TFX	Cascade	49 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.