Alert archive / Montana / Flash Flood Warnings in 2026

Flash Flood Warning 1, NWS Great Falls, MT

May 28, 2026Glacier County, Montana

NWS Great Falls, MT issued this flash flood warning at May 28, 2026, 6:13 PM MDT for Glacier County, Montana. It was in force for 114 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 28, 2026, 6:13 PM MDT (00:13 UTC)
Expired: May 28, 2026, 8:07 PM MDT
In force: 114 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon
Flood severity: None

County Glacier County, MT

The radar

The Great Falls radar (KTFX), 183 km from the middle of the area, began a volume at 00:15 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

Spokane, WA (KOTX), launched 00:00Z, 0.2 hours before the alert went out and 276 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: 1168 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 2331 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 9 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

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 May 28, 5:45 PM MDT, 28 minutes earlier.

Area forecast discussion, May 28, 5:45 PM MDT, 28 minutes before

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In the hours before

Special weather statement, May 28, 2:08 PM MDT, 4 hours 5 minutes before

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Special weather statement, May 28, 4:36 PM MDT, 1 hour 37 minutes before

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Special weather statement, May 28, 4:57 PM MDT, 1 hour 16 minutes before

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Special weather statement, May 28, 5:27 PM MDT, 46 minutes before

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Special weather statement, May 28, 5:30 PM MDT, 43 minutes before

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        Please try again in a few minutes.
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Special weather statement, May 28, 6:05 PM MDT, 8 minutes before

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<body>
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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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      <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
May 28, 6:05 PM MDT	Special Weather Statement	TFX	Glacier	40 min
May 28, 6:18 PM MDT	Special Weather Statement	TFX	Toole	42 min
May 28, 7:31 PM MDT	Special Weather Statement	TFX	Glacier	29 min
May 28, 7:36 PM MDT	Areal Flood Advisory	TFX	Glacier	3 hr
May 28, 8:07 PM MDT	Areal Flood Advisory	TFX	Glacier	55 min
May 28, 10:46 PM MDT	Special Weather Statement	TFX	Cascade, Pondera, Teton	44 min
May 28, 11:11 PM MDT	Areal Flood Advisory	TFX	Cascade	67 min
May 28, 11:43 PM MDT	Special Weather Statement	TFX	Glacier, Pondera	47 min
May 29, 12:47 AM MDT	Special Weather Statement	TFX	Toole	58 min
May 29, 1:22 PM MDT	Flood Watch	TFX	Cascade, Glacier, Lewis and Clark, Pondera, Teton, Toole	45 hr
May 29, 2:04 PM MDT	Special Weather Statement	TFX	Fergus	41 min
May 29, 2:22 PM MDT	Special Weather Statement	TFX	Pondera	38 min
May 29, 2:32 PM MDT	Special Weather Statement	TFX	Lewis and Clark	28 min
May 29, 2:55 PM MDT	Special Weather Statement	TFX	Lewis and Clark	35 min
May 29, 3:15 PM MDT	Special Weather Statement	TFX	Lewis and Clark	30 min
May 29, 3:26 PM MDT	Special Weather Statement	TFX	Blaine	34 min
May 29, 3:32 PM MDT	Special Weather Statement	TFX	Judith Basin	28 min
May 29, 3:45 PM MDT	Special Weather Statement	TFX	Judith Basin	30 min
May 29, 3:53 PM MDT	Special Weather Statement	TFX	Fergus	37 min
May 29, 3:57 PM MDT	Areal Flood Advisory	TFX	Cascade, Judith Basin	3 hr
May 29, 3:59 PM MDT	Special Weather Statement	TFX	Blaine	31 min
May 29, 4:00 PM MDT	Special Weather Statement	TFX	Judith Basin	30 min
May 29, 4:11 PM MDT	Special Weather Statement	TFX	Judith Basin	34 min
May 29, 4:14 PM MDT	Special Weather Statement	TFX	Blaine	31 min
May 29, 4:22 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	23 min
May 29, 4:24 PM MDT	Special Weather Statement	TFX	Judith Basin	51 min
May 29, 4:43 PM MDT	Severe Thunderstorm Warning	TFX	Blaine	32 min
May 29, 5:01 PM MDT	Areal Flood Advisory	TFX	Blaine	3 hr
May 29, 5:04 PM MDT	Special Weather Statement	TFX	Fergus	26 min
May 29, 5:15 PM MDT	Special Weather Statement	TFX	Blaine	45 min
May 29, 5:44 PM MDT	Special Weather Statement	TFX	Petroleum	46 min
May 29, 5:50 PM MDT	Special Weather Statement	TFX	Hill	40 min

Nearby

Flash Flood Warnings in Montana, 2026 Every flash flood 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.