Alert archive / California / Frost Advisories in 2018
Frost Advisory 6, NWS Los Angeles, CA
NWS Los Angeles, CA issued this frost advisory at Feb 23, 2018, 2:06 PM PST for Los Angeles County, California. It took effect at Feb 24, 2018, 1:00 AM PST. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Feb 23, 2018, 2:06 PM PST (22:06 UTC)
- In effect from
- Feb 24, 2018, 1:00 AM PST
- Expired
- Feb 24, 2018, 9:00 AM PST
- In force
- 8 hr
- Issued by
- NWS Los Angeles, CA
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 22:05 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 12:00Z, 10.1 hours before the alert went out and 184 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.
- Mixed-layer CAPE
- 18 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 927 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 154 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Feb 23, 1:38 PM PST, 28 minutes earlier.
Area forecast discussion, Feb 23, 1:38 PM PST, 28 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 |
|---|---|---|---|---|
| Feb 22, 8:05 PM PST | Freeze Watch | LOX | 18 hr | |
| Feb 22, 8:06 PM PST | Winter Weather Advisory | LOX | 14 hr | |
| Feb 23, 4:51 AM PST | Hard Freeze Watch | LOX | 9 hr | |
| Feb 23, 2:06 PM PST | Freeze Warning | LOX | 19 hr | |
| Feb 23, 2:06 PM PST | Hard Freeze Warning | LOX | 19 hr |
Nearby
Frost Advisories in California, 2018Every frost advisory in 2018
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.