Alert archive / Colorado / Areal Flood Advisories in 2021

Areal Flood Advisory 96, NWS Denver/Boulder, CO

July 20, 2021Grand County, Colorado

NWS Denver/Boulder, CO issued this areal flood advisory at Jul 20, 2021, 3:27 PM MDT for Grand County, Colorado. It was in force for 78 min.

The area

The counties it named.

The facts

Issued: Jul 20, 2021, 3:27 PM MDT (21:27 UTC)
Expired: Jul 20, 2021, 4:45 PM MDT
In force: 78 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon

County Grand County, CO

The radar

The Denver radar (KFTG), 139 km from the middle of the area, began a volume at 21:29 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 areal flood 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 areal flood advisory went out at Jul 20, 2:59 PM MDT, 28 minutes earlier.

Area forecast discussion, Jul 20, 2:59 PM MDT, 28 minutes before

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Hazardous weather outlook, Jul 20, 10:34 AM MDT, 4 hours 53 minutes before

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<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.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 4:29 PM MDT	Areal Flood Advisory	BOU	Larimer	91 min
Jul 20, 4:53 PM MDT	Flash Flood Warning	BOU	Larimer	82 min
Jul 20, 5:24 PM MDT	Flash Flood Warning	BOU	Larimer	51 min

Nearby

Areal Flood Advisories in Colorado, 2021 Every areal flood 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.