Alert archive / Montana / Flash Flood Warnings in 2025

Flash Flood Warning 1, NWS Great Falls, MT

July 29, 2025Fergus County, Montana

NWS Great Falls, MT issued this flash flood warning at Jul 29, 2025, 2:45 PM MDT for Fergus County, Montana. It was in force for 5 hr. 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 29, 2025, 2:45 PM MDT (20:45 UTC)
Expired: Jul 29, 2025, 7:45 PM MDT
In force: 5 hr
Issued by: NWS Great Falls, MT
Area: Storm-based polygon
Flood severity: None

County Fergus County, MT

The radar

The Billings radar (KBLX), 164 km from the middle of the area, began a volume at 20:46 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

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 8.8 hours before the alert went out and 223 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 946 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 104 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Jul 29, 11:21 AM MDT, 3 hours 24 minutes earlier.

Area forecast discussion, Jul 29, 11:21 AM MDT, 3 hours 24 minutes before

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In the hours before

Local storm report, Jul 29, 9:55 AM MDT, 4 hours 50 minutes before

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Local storm report, Jul 29, 12:27 PM MDT, 2 hours 18 minutes before

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      <p id="message1">
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      <p id="message2">
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Local storm report, Jul 29, 1:27 PM MDT, 1 hour 18 minutes before

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      <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.
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      <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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Special weather statement, Jul 29, 1:37 PM MDT, 1 hour 8 minutes before

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<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.
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Special weather statement, Jul 29, 2:41 PM MDT, 4 minutes before

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  <main class="wrap">
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      <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.
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Special weather statement, Jul 29, 2:45 PM MDT, 0 minutes before

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</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>
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</body>
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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 28, 6:00 PM MDT	Areal Flood Advisory	TFX	Fergus	3 hr
Jul 28, 6:01 PM MDT	Areal Flood Advisory	TFX	Fergus	3 hr
Jul 28, 6:03 PM MDT	Special Weather Statement	TFX	Lewis and Clark	42 min
Jul 28, 6:25 PM MDT	Special Weather Statement	TFX	Musselshell	35 min
Jul 28, 7:26 PM MDT	Special Weather Statement	TFX	Blaine	34 min
Jul 28, 7:57 PM MDT	Special Weather Statement	TFX	Blaine	48 min
Jul 28, 8:45 PM MDT	Special Weather Statement	TFX		30 min
Jul 28, 9:48 PM MDT	Special Weather Statement	TFX	Blaine	42 min
Jul 29, 1:37 PM MDT	Special Weather Statement	TFX	Fergus	68 min
Jul 29, 1:49 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	56 min
Jul 29, 2:24 PM MDT	Areal Flood Advisory	TFX	Fergus	21 min
Jul 29, 2:41 PM MDT	Special Weather Statement	TFX	Fergus	49 min
Jul 29, 2:45 PM MDT	Special Weather Statement	TFX	Lewis and Clark	45 min
Jul 29, 2:57 PM MDT	Special Weather Statement	TFX		33 min
Jul 29, 3:37 PM MDT	Special Weather Statement	TFX	Gallatin	68 min
Jul 29, 3:45 PM MDT	Areal Flood Advisory	TFX	Lewis and Clark	3 hr
Jul 29, 3:53 PM MDT	Special Weather Statement	TFX		67 min
Jul 29, 4:09 PM MDT	Special Weather Statement	TFX	Madison	66 min
Jul 29, 4:22 PM MDT	Severe Thunderstorm Warning	TFX	Madison	26 min
Jul 29, 4:24 PM MDT	Special Weather Statement	TFX		36 min
Jul 29, 4:37 PM MDT	Special Weather Statement	TFX	Blaine	23 min
Jul 29, 4:41 PM MDT	Areal Flood Advisory	TFX	Blaine	3 hr
Jul 29, 4:42 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	52 min
Jul 29, 4:51 PM MDT	Severe Thunderstorm Warning	TFX	Blaine, Fergus	54 min
Jul 29, 5:13 PM MDT	Flash Flood Warning	TFX	Blaine, Fergus	3 hr
Jul 29, 5:27 PM MDT	Special Weather Statement	TFX	Meagher	33 min
Jul 29, 5:41 PM MDT	Special Weather Statement	TFX	Fergus	49 min

Nearby

Flash Flood Warnings in Montana, 2025 Every flash flood warning in 2025

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.