Alert archive / California / Areal Flood Advisories in 2012

Areal Flood Advisory 23, NWS Eureka, CA

December 23, 2012Mendocino County, California

NWS Eureka, CA issued this areal flood advisory at Dec 23, 2012, 6:43 AM PST for Mendocino County, California. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
Dec 23, 2012, 6:43 AM PST (14:43 UTC)
Expired
Dec 23, 2012, 12:45 PM PST
In force
6 hr
Issued by
NWS Eureka, CA
Area
Storm-based polygon

County Mendocino County, CA

The radar

The Eureka (Bunker Hill) radar (KBHX), 139 km from the middle of the area, began a volume at 14:44 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 nearest sounding before it

Oakland, CA (KOAK), launched 12:00Z, 2.7 hours before the alert went out and 218 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Oakland, CA at 12:00Z on 2012-12-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Oakland, CA at 12:00Z on 2012-12-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 178 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
5 J/kg
Mixed-layer CIN
-19 J/kg
Mixed-layer LCL
833 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
178 m²/s²
0-3 km storm-relative helicity
210 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood advisory 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 areal flood advisory went out at Dec 23, 4:50 AM PST, 1 hour 53 minutes earlier.

Area forecast discussion, Dec 23, 4:50 AM PST, 1 hour 53 minutes before
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Hazardous weather outlook, Dec 23, 5:36 AM PST, 1 hour 7 minutes before
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  <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.
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The office that day

Everything else NWS Eureka, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 22, 4:22 PM PSTSpecial Weather StatementEKAMendocino23 min
Dec 22, 4:29 PM PSTSpecial Marine WarningEKA31 min
Dec 22, 4:58 PM PSTSpecial Marine WarningEKA17 min
Dec 22, 5:32 PM PSTSpecial Weather StatementEKAHumboldt28 min
Dec 22, 5:36 PM PSTAreal Flood AdvisoryEKAHumboldt3 hr
Dec 22, 7:36 PM PSTSpecial Marine WarningEKA24 min
Dec 22, 7:40 PM PSTSpecial Weather StatementEKA50 min
Dec 22, 10:50 PM PSTSpecial Marine WarningEKA10 min
Dec 22, 11:01 PM PSTSpecial Marine WarningEKA14 min
Dec 22, 11:16 PM PSTSpecial Marine WarningEKA14 min
Dec 22, 11:29 PM PSTSpecial Marine WarningEKA16 min
Dec 22, 11:50 PM PSTSpecial Marine WarningEKA10 min
Dec 22, 11:56 PM PSTSpecial Marine WarningEKA19 min
Dec 23, 12:29 AM PSTSpecial Marine WarningEKA31 min
Dec 23, 12:50 AM PSTSpecial Marine WarningEKA25 min
Dec 23, 1:02 AM PSTSpecial Marine WarningEKA28 min
Dec 23, 2:06 AM PSTSpecial Marine WarningEKA24 min
Dec 23, 6:46 AM PSTAreal Flood AdvisoryEKAHumboldt4 hr
Dec 23, 9:18 AM PSTRiver Flood WarningEKAMendocino17 hr
Dec 23, 11:06 AM PSTSmall Craft AdvisoryEKA3 hr
Dec 23, 1:00 PM PSTAreal Flood AdvisoryEKAMendocino4 hr
Dec 23, 2:36 PM PSTRiver Flood AdvisoryEKAMendocino10 hr
Dec 23, 2:48 PM PSTSmall Craft AdvisoryEKA12 hr

Nearby

Areal Flood Advisories in California, 2012Every areal flood advisory in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.