Alert archive / California / Flash Flood Warnings in 2010

Flash Flood Warning 3, NWS Los Angeles, CA

January 20, 2010Los Angeles County, California

NWS Los Angeles, CA issued this flash flood warning at Jan 20, 2010, 3:42 PM PST for Los Angeles County, California. It was in force for 3 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: Jan 20, 2010, 3:42 PM PST (23:42 UTC)
Expired: Jan 20, 2010, 6:30 PM PST
In force: 3 hr
Issued by: NWS Los Angeles, CA
Area: Storm-based polygon
Flood severity: None

County Los Angeles County, CA

The radar

The Santa Ana Mts radar (KSOX), 71 km from the middle of the area, began a volume at 23:43 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 Jan 20, 2:30 PM PST, 1 hour 12 minutes earlier.

Area forecast discussion, Jan 20, 2:30 PM PST, 1 hour 12 minutes before

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<body>
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    <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.
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      <p id="message2">
        Please try again in a few minutes.
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      <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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Hazardous weather outlook, Jan 20, 7:37 AM PST, 8 hours 5 minutes before

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<head>
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  <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>
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In the hours before

Special weather statement, Jan 20, 2:45 PM PST, 57 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>
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Local storm report, Jan 20, 2:51 PM PST, 51 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
Jan 19, 8:00 PM PST	Gale Watch	LOX		6 hr
Jan 19, 8:00 PM PST	Small Craft Advisory	LOX		17 hr
Jan 19, 8:59 PM PST	High Wind Warning	LOX	Los Angeles, Santa Barbara	23 hr
Jan 19, 10:12 PM PST	Coastal Flood Warning	LOX	Los Angeles	68 hr
Jan 19, 10:41 PM PST	Winter Storm Warning	LOX		71 hr
Jan 19, 11:45 PM PST	Special Marine Warning	LOX		47 min
Jan 20, 2:18 AM PST	Gale Warning	LOX		11 hr
Jan 20, 2:18 AM PST	Small Craft Advisory	LOX		31 hr
Jan 20, 2:18 AM PST	Storm Warning	LOX		11 hr
Jan 20, 3:41 AM PST	Special Weather Statement	LOX	Los Angeles	49 min
Jan 20, 5:34 AM PST	Special Marine Warning	LOX		41 min
Jan 20, 5:37 AM PST	Severe Thunderstorm Warning	LOX	San Luis Obispo, Santa Barbara	83 min
Jan 20, 5:58 AM PST	Areal Flood Advisory	LOX	San Luis Obispo, Santa Barbara	9 hr
Jan 20, 6:39 AM PST	Special Marine Warning	LOX		36 min
Jan 20, 9:34 AM PST	Areal Flood Advisory	LOX	Los Angeles, Ventura	9 hr
Jan 20, 10:17 AM PST	Special Marine Warning	LOX		43 min
Jan 20, 10:58 AM PST	Special Marine Warning	LOX		47 min
Jan 20, 11:51 AM PST	Special Marine Warning	LOX		39 min
Jan 20, 1:21 PM PST	Gale Warning	LOX		99 min
Jan 20, 2:19 PM PST	Special Marine Warning	LOX		26 min
Jan 20, 2:30 PM PST	Wind Advisory	LOX	Los Angeles	6 hr
Jan 20, 2:45 PM PST	Special Weather Statement	LOX	Los Angeles	30 min
Jan 20, 3:00 PM PST	Gale Watch	LOX		6 hr

Nearby

Flash Flood Warnings in California, 2010 Every flash flood warning in 2010

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.