Alert archive / California / Flash Flood Warnings in 2023

Flash Flood Warning 30, NWS Los Angeles, CA

December 21, 2023Santa Barbara County, California

NWS Los Angeles, CA issued this flash flood warning at Dec 21, 2023, 8:42 AM PST for Santa Barbara County, California. It was in force for 7 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Dec 21, 2023, 8:42 AM PST (16:42 UTC)
Expired: Dec 21, 2023, 3:54 PM PST
In force: 7 hr
Issued by: NWS Los Angeles, CA
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Santa Barbara County, CA

The radar

The Vandenberg AFB radar (KVBX), 47 km from the middle of the area, began a volume at 16:45 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 flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Los Angeles, CA wrote its last area forecast discussion before this flash flood warning went out at Dec 21, 3:07 AM PST, 5 hours 35 minutes earlier.

Area forecast discussion, Dec 21, 3:07 AM PST, 5 hours 35 minutes before

<!doctype html>
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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>

In the hours before

Local storm report, Dec 21, 2:53 AM PST, 5 hours 49 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>

Local storm report, Dec 21, 2:56 AM PST, 5 hours 46 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>

Local storm report, Dec 21, 3:06 AM PST, 5 hours 36 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 Los Angeles, CA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 20, 7:24 PM PST	Areal Flood Advisory	LOX	Los Angeles	3 hr
Dec 20, 7:35 PM PST	Special Marine Warning	LOX		25 min
Dec 20, 7:42 PM PST	Special Weather Statement	LOX	Santa Barbara	48 min
Dec 20, 8:06 PM PST	Special Marine Warning	LOX		24 min
Dec 20, 8:32 PM PST	Special Marine Warning	LOX		118 min
Dec 20, 9:35 PM PST	Flash Flood Warning Considerable damage threat	LOX	Santa Barbara, Ventura	3 hr
Dec 21, 12:38 AM PST	Special Marine Warning	LOX		52 min
Dec 21, 1:18 AM PST	Areal Flood Advisory	LOX	Ventura	3 hr
Dec 21, 1:25 AM PST	Special Weather Statement	LOX	Ventura	65 min
Dec 21, 1:28 AM PST	Tornado Warning	LOX	Ventura	32 min
Dec 21, 1:52 AM PST	Flash Flood Warning Considerable damage threat	LOX	Ventura	113 min
Dec 21, 1:56 AM PST	Tornado Warning	LOX	Ventura	34 min
Dec 21, 2:52 AM PST	Areal Flood Advisory	LOX	Los Angeles	3 hr
Dec 21, 3:59 AM PST	Areal Flood Advisory	LOX	Los Angeles, Ventura	12 hr
Dec 21, 4:05 AM PST	Special Marine Warning	LOX		25 min
Dec 21, 7:28 AM PST	Areal Flood Advisory	LOX	Santa Barbara	6 hr
Dec 21, 8:52 AM PST	Special Marine Warning	LOX		113 min
Dec 21, 9:09 AM PST	Special Weather Statement	LOX	Santa Barbara	36 min
Dec 21, 11:12 AM PST	Areal Flood Advisory	LOX	Los Angeles	5 hr
Dec 21, 12:22 PM PST	Areal Flood Advisory	LOX	Los Angeles	4 hr
Dec 21, 1:49 PM PST	Special Weather Statement	LOX	Los Angeles	26 min
Dec 21, 2:18 PM PST	Special Weather Statement	LOX	Los Angeles	12 min
Dec 21, 2:50 PM PST	Special Marine Warning	LOX		55 min
Dec 21, 3:34 PM PST	Areal Flood Advisory	LOX	Los Angeles, Ventura	9 hr
Dec 21, 3:40 PM PST	Special Marine Warning	LOX		2 hr
Dec 21, 3:54 PM PST	Areal Flood Warning	LOX	Santa Barbara	9 hr

Nearby

Flash Flood Warnings in California, 2023 Every flash flood warning in 2023

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.