Alert archive / California / River Flood Warnings in 2024

River Flood Warning 5, NWS San Francisco Bay Area, CA

November 21, 2024Sonoma County, California

NWS San Francisco Bay Area, CA issued this river flood warning at Nov 21, 2024, 8:23 PM PST for Sonoma County, California. It took effect at Nov 22, 2024, 2:00 PM PST. It was in force for 35 hr.

The area

The counties it named.

The facts

Issued: Nov 21, 2024, 8:23 PM PST (04:23 UTC)
In effect from: Nov 22, 2024, 2:00 PM PST
Expired: Nov 24, 2024, 1:16 AM PST
In force: 35 hr
Issued by: NWS San Francisco Bay Area, CA
Area: Storm-based polygon
Flood severity: Minor

County Sonoma County, CA

The radar

The Sacramento radar (KDAX), 108 km from the middle of the area, began a volume at 04:23 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 Russian River at Guerneville (GUEC1).

Action stage: 29 ft
Minor stage: 32 ft
Moderate stage: 35 ft
Major stage: 40 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 11467002, 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 warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS San Francisco Bay Area, CA wrote its last area forecast discussion before this river flood warning went out at Nov 21, 4:13 PM PST, 4 hours 10 minutes earlier.

Area forecast discussion, Nov 21, 4:13 PM PST, 4 hours 10 minutes before

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In the hours before

Local storm report, Nov 21, 2:51 PM PST, 5 hours 32 minutes before

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  <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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Local storm report, Nov 21, 2:52 PM PST, 5 hours 31 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.
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Local storm report, Nov 21, 2:53 PM PST, 5 hours 30 minutes before

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<head>
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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>
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Local storm report, Nov 21, 5:20 PM PST, 3 hours 3 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>

Local storm report, Nov 21, 6:13 PM PST, 2 hours 10 minutes before

<!doctype html>
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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>
  <script src="index.js"></script>
</body>
</html>

Local storm report, Nov 21, 6:28 PM PST, 1 hour 55 minutes before

<!doctype html>
<html lang="en">
<head>
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  <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 San Francisco Bay Area, CA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 22, 11:37 AM PST	Areal Flood Advisory	MTR	City and County of San Francisco	8 hr
Nov 22, 11:44 AM PST	Areal Flood Advisory	MTR	City and County of San Francisco, San Mateo	8 hr
Nov 22, 12:05 PM PST	Areal Flood Advisory	MTR	Alameda, Contra Costa	9 hr
Nov 22, 12:43 PM PST	Flash Flood Warning Considerable damage threat	MTR	City and County of San Francisco	3 hr
Nov 22, 2:00 PM PST	Flash Flood Warning	MTR	City and County of San Francisco, San Mateo	3 hr
Nov 22, 2:58 PM PST	Flash Flood Warning	MTR	Alameda, Contra Costa	3 hr
Nov 22, 3:30 PM PST	Areal Flood Advisory	MTR	San Mateo, Santa Clara, Santa Cruz	9 hr
Nov 22, 3:42 PM PST	Areal Flood Warning	MTR	City and County of San Francisco	3 hr

Nearby

River Flood Warnings in California, 2024 Every river flood warning in 2024

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.