Alert archive / Colorado / River Flood Advisories in 2011

River Flood Advisory 18, NWS Denver/Boulder, CO

July 20, 2011Grand County, Colorado

NWS Denver/Boulder, CO issued this river flood advisory at Jul 20, 2011, 9:51 AM MDT for Grand County, Colorado. It was in force for 51 hr.

The area

The counties it named.

The facts

Issued: Jul 20, 2011, 9:51 AM MDT (15:51 UTC)
Expired: Jul 22, 2011, 12:46 PM MDT
In force: 51 hr
Issued by: NWS Denver/Boulder, CO

County Grand County, CO

The radar

The Denver radar (KFTG), 139 km from the middle of the area, began a volume at 15:53 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 river

Written for the forecast point Colorado River near Granby (CBGC2).

Action stage: 5 ft
Minor stage: 6 ft
Moderate stage: 7 ft
Major stage: 9 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 09019500, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

What forecasters said that day

The local office's own words before this river 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 river flood advisory went out at Jul 20, 3:51 AM MDT, 6 hours earlier.

Area forecast discussion, Jul 20, 3:51 AM MDT, 6 hours before

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Hazardous weather outlook, Jul 20, 4:47 AM MDT, 5 hours 4 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
Jul 19, 6:14 PM MDT	Flash Flood Warning	BOU	Boulder	42 min
Jul 19, 7:31 PM MDT	Special Weather Statement	BOU	Weld	29 min

Nearby

River Flood Advisories in Colorado, 2011 Every river flood advisory in 2011

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; the gauge from the NWS water service and the USGS.