Alert archive / California / Frost Advisories in 2024

Frost Advisory 2, NWS Los Angeles, CA

January 7, 2024Los Angeles County, Santa Barbara County, Ventura County, California

NWS Los Angeles, CA issued this frost advisory at Jan 7, 2024, 1:47 PM PST for Los Angeles County, Santa Barbara County, Ventura County, California. It took effect at Jan 8, 2024, 1:00 AM PST. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued
Jan 7, 2024, 1:47 PM PST (21:47 UTC)
In effect from
Jan 8, 2024, 1:00 AM PST
Expired
Jan 8, 2024, 9:00 AM PST
In force
8 hr
Issued by
NWS Los Angeles, CA

Counties Los Angeles County, CA, Santa Barbara County, CA, Ventura County, CA

The radar

The Los Angeles radar (KVTX), 6 km from the middle of the area, began a volume at 21:48 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, 9.8 hours before the alert went out and 250 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, San Diego, CA at 12:00Z on 2024-01-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 23 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, San Diego, CA at 12:00Z on 2024-01-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 64 square meters per square second.1939587897117Sfc1 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
23 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
460 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
64 m²/s²
0-3 km storm-relative helicity
121 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 7, 9:25 AM PSTWind AdvisoryLOXLos Angeles, Ventura10 hr
Jan 7, 1:47 PM PSTFreeze WatchLOXLos Angeles, San Luis Obispo, Santa Barbara, Ventura20 hr
Jan 7, 1:47 PM PSTFreeze WarningLOXSanta Barbara, Ventura20 hr
Jan 7, 1:47 PM PSTHard Freeze WatchLOXSan Luis Obispo, Santa Barbara20 hr
Jan 7, 1:47 PM PSTHard Freeze WarningLOXSan Luis Obispo, Santa Barbara20 hr
Jan 7, 1:48 PM PSTGale WatchLOX54 hr
Jan 7, 1:48 PM PSTSmall Craft AdvisoryLOX50 hr

Nearby

Frost Advisories in California, 2024Every frost advisory in 2024

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.