Alert archive / California / Frost Advisories in 2025

Frost Advisory 3, NWS San Diego, CA

March 6, 2025Riverside County, San Bernardino County, California

NWS San Diego, CA issued this frost advisory at Mar 6, 2025, 11:49 PM PST for Riverside County, San Bernardino County, California. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued
Mar 6, 2025, 11:49 PM PST (07:49 UTC)
Expired
Mar 7, 2025, 9:00 AM PST
In force
9 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 07:52 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

Las Vegas, NV (KVEF), launched 00:00Z, 7.8 hours before the alert went out and 237 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, Las Vegas, NV at 00:00Z on 2025-03-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 9 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, Las Vegas, NV at 00:00Z on 2025-03-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 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
9 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
2012 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
17 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 6, 8:06 PM PSTAreal Flood AdvisorySGXSan Diego4 hr
Mar 6, 8:47 PM PSTSpecial Marine WarningSGX28 min
Mar 6, 9:06 PM PSTSpecial Weather StatementSGXSan Diego54 min
Mar 6, 11:49 PM PSTFrost AdvisorySGXRiverside, San Bernardino, San Diego33 hr
Mar 7, 3:56 PM PSTAreal Flood AdvisorySGXOrange, Riverside, San Bernardino60 min

Nearby

Frost Advisories in California, 2025Every frost advisory in 2025

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.