Alert archive / Montana / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 70, NWS Great Falls, MT

July 17, 2026Lewis and Clark County, Teton County, Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jul 17, 2026, 2:51 PM MDT for Lewis and Clark County, Teton County, Montana. It was in force for 54 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 17, 2026, 2:51 PM MDT (20:51 UTC)
Expired: Jul 17, 2026, 3:45 PM MDT
In force: 54 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 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 20:53 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.

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 17, 12:51 PM MDT, 2 hours earlier.

Area forecast discussion, Jul 17, 12:51 PM MDT, 2 hours before

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In the hours before

Special weather statement, Jul 17, 12:57 PM MDT, 1 hour 54 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <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.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
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Special weather statement, Jul 17, 2:14 PM MDT, 37 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <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.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 6:55 PM MDT	Special Weather Statement	TFX	Glacier	50 min
Jul 16, 7:02 PM MDT	Severe Thunderstorm Warning	TFX	Glacier	44 min
Jul 16, 7:45 PM MDT	Special Weather Statement	TFX	Glacier	60 min
Jul 16, 7:56 PM MDT	Special Weather Statement	TFX	Glacier	64 min
Jul 17, 12:02 AM MDT	Flash Flood Watch	TFX	Broadwater, Gallatin, Lewis and Clark, Meagher	24 hr
Jul 17, 12:57 PM MDT	Special Weather Statement	TFX	Pondera	48 min
Jul 17, 2:14 PM MDT	Special Weather Statement	TFX	Teton	61 min
Jul 17, 3:32 PM MDT	Special Weather Statement	TFX	Lewis and Clark	43 min
Jul 17, 3:36 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Cascade, Lewis and Clark, Teton	24 min
Jul 17, 4:29 PM MDT	Special Weather Statement	TFX	Lewis and Clark	91 min
Jul 17, 5:08 PM MDT	Special Weather Statement	TFX	Cascade	52 min
Jul 17, 5:49 PM MDT	Special Weather Statement	TFX	Cascade	41 min
Jul 17, 5:59 PM MDT	Areal Flood Advisory	TFX	Lewis and Clark	3 hr

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.