Alert archive / Colorado / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 106, NWS Denver/Boulder, CO

June 21, 2026Washington County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 21, 2026, 2:25 PM MDT for Washington County, Colorado. It was in force for 35 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: Jun 21, 2026, 2:25 PM MDT (20:25 UTC)
Expired: Jun 21, 2026, 3:00 PM MDT
In force: 35 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Possible
Hail: 1.25 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 20:26 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
Jun 21, 12:46 PM MDT	Severe Thunderstorm Watch	SPC	7 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 Jun 21, 11:53 AM MDT, 2 hours 32 minutes earlier.

Area forecast discussion, Jun 21, 11:53 AM MDT, 2 hours 32 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>

In the hours before

Special weather statement, Jun 21, 1:34 PM MDT, 51 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>

Special weather statement, Jun 21, 1:38 PM MDT, 47 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>

Special weather statement, Jun 21, 1:41 PM MDT, 44 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>

Local storm report, Jun 21, 1:55 PM MDT, 30 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>

Local storm report, Jun 21, 2:06 PM MDT, 19 minutes before

Preliminary Local Storm Report
National Weather Service Denver CO
206 PM MDT Sun Jun 21 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0130 PM     Landspout        3 ESE Pleasant Valley   40.59N 102.06W
06/21/2026                   Phillips           CO   Storm Chaser

&&

KEB

Special weather statement, Jun 21, 2:15 PM MDT, 10 minutes before

Special Weather Statement
National Weather Service Denver CO
215 PM MDT Sun Jun 21 2026

COZ046-212100-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County CO-
215 PM MDT Sun Jun 21 2026

...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN LINCOLN COUNTY
UNTIL 3 PM MDT...

At 215 PM MDT, Doppler radar was tracking a strong thunderstorm 8
miles north of Arriba, or 25 miles east of Limon, moving east at 25
mph.

HAZARD...Landspouts, wind gusts of 50 to 55 mph, and nickel size
         hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to outdoor objects is possible. Gusty winds
         could knock down tree limbs and blow around unsecured
         objects.

Locations impacted include...
  Arriba.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

&&

LAT...LON 3920 10345 3957 10346 3957 10315 3920 10315
TIME...MOT...LOC 2015Z 276DEG 22KT 3940 10326

LANDSPOUT...POSSIBLE
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 TO 55 MPH

63

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 7:17 PM MDT	Severe Thunderstorm Warning	BOU	Weld	43 min
Jun 20, 7:35 PM MDT	Tornado Warning	BOU	Weld	28 min
Jun 20, 7:52 PM MDT	Severe Thunderstorm Warning	BOU	Weld	38 min
Jun 20, 8:03 PM MDT	Severe Thunderstorm Warning	BOU	Weld	27 min
Jun 20, 8:26 PM MDT	Severe Thunderstorm Warning	BOU	Weld	34 min
Jun 20, 8:41 PM MDT	Special Weather Statement	BOU	Logan	49 min
Jun 20, 9:01 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Weld	29 min
Jun 20, 9:37 PM MDT	Severe Thunderstorm Warning	BOU	Logan	38 min
Jun 20, 10:22 PM MDT	Severe Thunderstorm Warning	BOU	Weld	38 min
Jun 20, 10:46 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Weld	35 min
Jun 21, 1:19 PM MDT	Special Weather Statement	BOU	Washington	26 min
Jun 21, 1:34 PM MDT	Special Weather Statement	BOU	Phillips	41 min
Jun 21, 1:38 PM MDT	Special Weather Statement	BOU	Washington	37 min
Jun 21, 1:41 PM MDT	Special Weather Statement	BOU	Morgan	49 min
Jun 21, 1:53 PM MDT	Severe Thunderstorm Warning	BOU	Washington	37 min
Jun 21, 2:15 PM MDT	Special Weather Statement	BOU	Lincoln	45 min
Jun 21, 2:28 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	32 min
Jun 21, 4:50 PM MDT	Severe Thunderstorm Warning	BOU	Washington	40 min
Jun 21, 4:52 PM MDT	Severe Thunderstorm Warning	BOU	Washington	22 min
Jun 21, 5:39 PM MDT	Special Weather Statement	BOU	Morgan	36 min
Jun 21, 5:46 PM MDT	Special Weather Statement	BOU	Arapahoe	44 min

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.