Alert archive / Colorado / Dense Fog Advisories in 2021

Dense Fog Advisory 4, NWS Denver/Boulder, CO

March 27, 2021Larimer County, Morgan County, Weld County, Colorado

NWS Denver/Boulder, CO issued this dense fog advisory at Mar 27, 2021, 3:57 AM MDT for Larimer County, Morgan County, Weld County, Colorado. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Mar 27, 2021, 3:57 AM MDT (09:57 UTC)
Expired: Mar 27, 2021, 8:00 AM MDT
In force: 4 hr
Issued by: NWS Denver/Boulder, CO

Counties Larimer County, CO, Morgan County, CO, Weld County, CO

The radar

The Cheyenne radar (KCYS), 76 km from the middle of the area, began a volume at 09:58 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 dense fog advisory 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 dense fog advisory went out at Mar 27, 3:23 AM MDT, 34 minutes earlier.

Area forecast discussion, Mar 27, 3:23 AM MDT, 34 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>

Hazardous weather outlook, Mar 26, 10:31 AM MDT, 17 hours 26 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 Denver/Boulder, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 27, 5:51 AM MDT	Special Weather Statement	BOU	Adams, Denver, Washington	54 min
Mar 27, 1:31 PM MDT	Fire Weather Watch	BOU	Elbert, Lincoln	22 hr

Nearby

Dense Fog Advisories in Colorado, 2021 Every dense fog advisory in 2021

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.