Alert archive / California / River Flood Watches in 2025

River Flood Watch 2, NWS Eureka, CA

December 21, 2025Mendocino County, California

NWS Eureka, CA issued this river flood watch at Dec 21, 2025, 12:21 AM PST for Mendocino County, California. It took effect at Dec 21, 2025, 11:00 AM PST. It was in force for .

The area

The counties it named.

The facts

Issued: Dec 21, 2025, 12:21 AM PST (08:21 UTC)
In effect from: Dec 21, 2025, 11:00 AM PST
Expired: Dec 21, 2025, 8:53 AM PST
In force
Issued by: NWS Eureka, CA
Area: Storm-based polygon
Flood severity: None

County Mendocino County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 139 km from the middle of the area, began a volume at 08:24 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 near Hopland (HOPC1). The gauge peaked at 18.04 ft at Dec 22, 2025, 4:00 AM PST.

Minor stage: 15 ft
Moderate stage: 23 ft
Major stage: 26 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 11462500, 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 watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Eureka, CA wrote its last area forecast discussion before this river flood watch went out at Dec 20, 9:53 PM PST, 2 hours 28 minutes earlier.

Area forecast discussion, Dec 20, 9:53 PM PST, 2 hours 28 minutes before

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In the hours before

Local storm report, Dec 21, 12:20 AM PST, 1 minute 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 Eureka, CA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 20, 7:55 PM PST	Wind Advisory	EKA	Humboldt, Lake, Mendocino	18 hr
Dec 20, 7:58 PM PST	Gale Warning	EKA		17 hr
Dec 21, 2:29 AM PST	Areal Flood Advisory	EKA	Humboldt, Mendocino, Trinity	4 hr
Dec 21, 4:13 AM PST	Areal Flood Advisory	EKA	Humboldt, Trinity	6 hr
Dec 21, 5:53 AM PST	Small Craft Advisory	EKA		4 hr
Dec 21, 6:10 AM PST	Areal Flood Warning	EKA	Humboldt	17 hr
Dec 21, 6:34 AM PST	River Flood Watch	EKA	Humboldt	2 hr
Dec 21, 6:43 AM PST	Areal Flood Advisory	EKA	Del Norte, Humboldt, Mendocino, Trinity	4 hr
Dec 21, 8:52 AM PST	River Flood Warning	EKA	Mendocino	26 hr
Dec 21, 9:02 AM PST	River Flood Warning	EKA	Humboldt	32 hr
Dec 21, 9:05 AM PST	River Flood Warning	EKA	Humboldt	18 hr
Dec 21, 10:01 AM PST	Small Craft Advisory	EKA		119 min
Dec 21, 10:37 AM PST	Areal Flood Warning	EKA	Humboldt, Trinity	15 hr
Dec 21, 10:51 AM PST	Flash Flood Warning	EKA	Humboldt, Trinity	62 min
Dec 21, 11:05 AM PST	Areal Flood Warning	EKA	Lake, Mendocino	9 hr
Dec 21, 11:07 AM PST	Areal Flood Advisory	EKA	Lake	5 hr
Dec 21, 12:03 PM PST	Areal Flood Warning	EKA	Humboldt, Trinity	7 hr
Dec 21, 2:25 PM PST	River Flood Warning	EKA	Humboldt	6 hr
Dec 21, 3:50 PM PST	Areal Flood Warning	EKA	Lake	7 hr

Nearby

River Flood Watches in California, 2025 Every river flood watch in 2025

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.