Alert archive / California / Frost Advisories in 2023

Frost Advisory 2, NWS San Diego, CA

January 20, 2023Riverside County, San Bernardino County, California

NWS San Diego, CA issued this frost advisory at Jan 20, 2023, 2:45 AM PST for Riverside County, San Bernardino County, California. It took effect at Jan 20, 2023, 10:00 PM PST. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued: Jan 20, 2023, 2:45 AM PST (10:45 UTC)
In effect from: Jan 20, 2023, 10:00 PM PST
Expired: Jan 21, 2023, 8:00 AM PST
In force: 10 hr
Issued by: NWS San Diego, CA

Counties Riverside County, CA, San Bernardino County, CA

The radar

The Santa Ana Mts radar (KSOX), 152 km from the middle of the area, began a volume at 10:46 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 frost advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS San Diego, CA wrote its last area forecast discussion before this frost advisory went out at Jan 20, 2:33 AM PST, 12 minutes earlier.

Area forecast discussion, Jan 20, 2:33 AM PST, 12 minutes before

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In the hours before

Local storm report, Jan 19, 10:07 PM PST, 4 hours 38 minutes before

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<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.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 20, 2:45 AM PST	Freeze Watch	SGX	San Bernardino	10 hr
Jan 20, 1:12 PM PST	Freeze Warning	SGX	San Bernardino	81 min

Nearby

Frost Advisories in California, 2023 Every frost advisory 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.