Alert archive / Colorado / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 296, NWS Denver/Boulder, CO

August 12, 2026Washington County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 12, 2026, 4:04 PM MDT for Washington County, Colorado. It was in force for 26 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: Aug 12, 2026, 4:04 PM MDT (22:04 UTC)
Expired: Aug 12, 2026, 4:30 PM MDT
In force: 26 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Washington County, CO

The radar

The Denver radar (KFTG), 117 km from the middle of the area, began a volume at 22:07 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
Aug 12, 2:32 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 Denver/Boulder, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 12, 2:28 PM MDT, 1 hour 36 minutes earlier.

Area forecast discussion, Aug 12, 2:28 PM MDT, 1 hour 36 minutes before

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In the hours before

Special weather statement, Aug 12, 2:20 PM MDT, 1 hour 44 minutes before

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Special weather statement, Aug 12, 2:37 PM MDT, 1 hour 27 minutes before

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      <p id="message1">
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      <p id="message2">
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Special weather statement, Aug 12, 3:04 PM MDT, 1 hour 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.
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      <p id="message2">
        Please try again in a few minutes.
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      <p class="small" id="detail">
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Special weather statement, Aug 12, 3:25 PM MDT, 39 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.
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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, Aug 12, 3:55 PM MDT, 9 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.
      </p>
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Special weather statement, Aug 12, 3:58 PM MDT, 6 minutes before

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<head>
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  <title>Service Notice</title>
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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>
</html>

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 11, 6:02 PM MDT	Special Weather Statement	BOU	Arapahoe	28 min
Aug 11, 6:20 PM MDT	Special Weather Statement	BOU	Elbert	25 min
Aug 11, 6:37 PM MDT	Special Weather Statement	BOU	Elbert	38 min
Aug 12, 2:20 PM MDT	Special Weather Statement	BOU	Arapahoe	25 min
Aug 12, 2:37 PM MDT	Special Weather Statement	BOU	Douglas	38 min
Aug 12, 3:04 PM MDT	Special Weather Statement	BOU	Arapahoe	26 min
Aug 12, 3:25 PM MDT	Special Weather Statement	BOU	Arapahoe	35 min
Aug 12, 3:55 PM MDT	Special Weather Statement	BOU	Morgan	35 min
Aug 12, 3:58 PM MDT	Special Weather Statement	BOU	Washington	32 min
Aug 12, 4:19 PM MDT	Special Weather Statement	BOU	Grand	26 min
Aug 12, 4:28 PM MDT	Special Weather Statement	BOU	Washington	32 min
Aug 12, 4:47 PM MDT	Severe Thunderstorm Warning	BOU	Weld	43 min
Aug 12, 5:08 PM MDT	Severe Thunderstorm Warning Considerable damage threat	BOU	Logan, Weld	37 min
Aug 12, 5:10 PM MDT	Special Weather Statement	BOU	Washington	35 min
Aug 12, 5:26 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Morgan, Washington	49 min
Aug 12, 5:35 PM MDT	Severe Thunderstorm Warning	BOU	Logan	40 min
Aug 12, 5:43 PM MDT	Areal Flood Advisory	BOU	Weld	3 hr
Aug 12, 5:45 PM MDT	Areal Flood Advisory	BOU	Washington	3 hr

Nearby

Severe Thunderstorm Warnings in Colorado, 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.