Alert archive / California / Frost Advisories in 2022

Frost Advisory 13, NWS Los Angeles, CA

November 9, 2022San Luis Obispo County, Ventura County, California

NWS Los Angeles, CA issued this frost advisory at Nov 9, 2022, 2:27 AM PST for San Luis Obispo County, Ventura County, California. It took effect at Nov 10, 2022, 12:00 AM PST. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Nov 9, 2022, 2:27 AM PST (10:27 UTC)
In effect from: Nov 10, 2022, 12:00 AM PST
Expired: Nov 10, 2022, 9:00 AM PST
In force: 9 hr
Issued by: NWS Los Angeles, CA

Counties San Luis Obispo County, CA, Ventura County, CA

The radar

The Vandenberg AFB radar (KVBX), 56 km from the middle of the area, began a volume at 10:29 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

San Diego, CA (KNKX), launched 00:00Z, 10.5 hours before the alert went out and 332 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 851 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 99 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 frost advisory 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 frost advisory went out at Nov 8, 10:30 PM PST, 3 hours 57 minutes earlier.

Area forecast discussion, Nov 8, 10:30 PM PST, 3 hours 57 minutes before

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In the hours before

Local storm report, Nov 8, 11:17 PM PST, 3 hours 10 minutes before

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<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.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 8, 4:09 PM PST	Flash Flood Warning Considerable damage threat	LOX	Los Angeles	26 min
Nov 8, 5:24 PM PST	Special Weather Statement	LOX	Santa Barbara	21 min
Nov 8, 8:48 PM PST	Winter Weather Advisory	LOX	Santa Barbara	11 hr
Nov 9, 2:27 AM PST	Freeze Watch	LOX	San Luis Obispo	8 hr
Nov 9, 3:10 AM PST	Small Craft Advisory	LOX		18 hr
Nov 9, 10:33 AM PST	Freeze Warning	LOX	San Luis Obispo	22 hr

Nearby

Frost Advisories in California, 2022 Every frost advisory in 2022

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.