Alert archive / California / Frost Advisories in 2024

Frost Advisory 4, NWS San Diego, CA

January 7, 2024Riverside County, San Diego County, California

NWS San Diego, CA issued this frost advisory at Jan 7, 2024, 10:38 AM PST for Riverside County, San Diego 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, 10:38 AM PST (18:38 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 San Diego, CA

Counties Riverside County, CA, San Diego County, CA

The radar

The San Diego radar (KNKX), 80 km from the middle of the area, began a volume at 18:40 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, 6.6 hours before the alert went out and 100 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

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 7, 8:38 AM PST, 2 hours earlier.

Area forecast discussion, Jan 7, 8:38 AM PST, 2 hours before
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In the hours before

Local storm report, Jan 7, 5:17 AM PST, 5 hours 21 minutes before
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Local storm report, Jan 7, 10:08 AM PST, 30 minutes before
Preliminary Local Storm Report
National Weather Service San Diego CA
1008 AM PST Sun Jan 7 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0615 AM     Non-Tstm Wnd Gst 3 S Crestline           34.21N 117.30W
01/07/2024  M71 MPH          San Bernardino     CA   Mesonet

            Mesonet station HF008 Marshall Peak
            (SDHGPA).

&&

EA
Local storm report, Jan 7, 10:09 AM PST, 29 minutes before
Preliminary Local Storm Report
National Weather Service San Diego CA
1009 AM PST Sun Jan 7 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0520 AM     Non-Tstm Wnd Gst 8 NE Campo              32.70N 116.37W
01/07/2024  M61 MPH          San Diego          CA   Mesonet

            Mesonet station CWDSD Crestwood (SDGE).

&&

EA
Local storm report, Jan 7, 10:12 AM PST, 26 minutes before
Preliminary Local Storm Report...Summary
National Weather Service San Diego CA
1012 AM PST Sun Jan 7 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0320 AM     Non-Tstm Wnd Gst 51 WSW Mission Beach    32.50N 118.05W
01/07/2024  M45 MPH          PZZ775             CA   Mesonet

            Mesonet station 46086 San Clemente Basin
            Buoy.

1200 AM     Non-Tstm Wnd Gst 11 ENE Campo            32.66N 116.29W
01/07/2024  M56 MPH          San Diego          CA   Mesonet

            Mesonet station BVDSD Boulevard West (SDGE).

1200 AM     Non-Tstm Wnd Gst 3 SSE Julian            33.04N 116.56W
01/07/2024  M65 MPH          San Diego          CA   Mesonet

            Mesonet station HRPSD Harrison Park (SDGE).

1215 AM     Non-Tstm Wnd Gst 3 SSE Julian            33.03N 116.57W
01/07/2024  M67 MPH          San Diego          CA   Mesonet

            Mesonet station DVI00558 Julian.

1230 AM     Non-Tstm Wnd Gst 7 N Pine Valley         32.93N 116.53W
01/07/2024  M58 MPH          San Diego          CA   Mesonet

            Mesonet station LFRSD Lucky Five Ranch
            (SDGE).

1230 AM     Non-Tstm Wnd Gst 4 SSE Pine Valley       32.78N 116.48W
01/07/2024  M58 MPH          San Diego          CA   Mesonet

            Mesonet station HF003 Pine Valley - Horse
            Launch.

0100 AM     Non-Tstm Wnd Gst 7 N Pine Valley         32.93N 116.53W
01/07/2024  M64 MPH          San Diego          CA   Mesonet

            Mesonet station LFRSD Lucky Five Ranch
            (SDGE).

0200 AM     Non-Tstm Wnd Gst 3 SSE Julian            33.04N 116.56W
01/07/2024  M68 MPH          San Diego          CA   Mesonet

            Mesonet station HRPSD Harrison Park (SDGE).

0330 AM     Non-Tstm Wnd Gst 4 SSE Pine Valley       32.78N 116.48W
01/07/2024  M65 MPH          San Diego          CA   Mesonet

            Mesonet station HF003 Pine Valley - Horse
            Launch.

0330 AM     Non-Tstm Wnd Gst 11 ENE Campo            32.66N 116.29W
01/07/2024  M68 MPH          San Diego          CA   Mesonet

            Mesonet station BVDSD Boulevard West (SDGE).

0340 AM     Non-Tstm Wnd Gst 8 NE Campo              32.70N 116.37W
01/07/2024  M58 MPH          San Diego          CA   Mesonet

            Mesonet station CWDSD Crestwood (SDGE).

0520 AM     Non-Tstm Wnd Gst 8 NE Campo              32.70N 116.37W
01/07/2024  M61 MPH          San Diego          CA   Mesonet

            Mesonet station CWDSD Crestwood (SDGE).

0550 AM     Non-Tstm Wnd Gst 9 E Campo               32.64N 116.32W
01/07/2024  M60 MPH          San Diego          CA   Mesonet

            Mesonet station WSTSD White Star (SDGE).

0630 AM     Non-Tstm Wnd Gst 4 SSE Pine Valley       32.78N 116.48W
01/07/2024  M68 MPH          San Diego          CA   Mesonet

            Mesonet station HF003 Pine Valley - Horse
            Launch.

1000 PM     Non-Tstm Wnd Gst 7 N Big Bear City       34.36N 116.86W
01/06/2024  M60 MPH          San Bernardino     CA   Mesonet

            Mesonet station SE269 Cushenbury Springs
            (SCE269).

1010 PM     Non-Tstm Wnd Gst 6 S Lucerne Valley      34.36N 116.94W
01/06/2024  M61 MPH          San Bernardino     CA   Mesonet

            Mesonet station SE484 Lucerne Valley
            (SCE484).

1010 PM     Non-Tstm Wnd Gst 5 SSE Lucerne Valley    34.37N 116.91W
01/06/2024  M63 MPH          San Bernardino     CA   Mesonet

            Mesonet station SE262 Lucerne Valley
            (SCE262).

1040 PM     Non-Tstm Wnd Gst 5 NW Crestline          34.30N 117.36W
01/06/2024  M67 MPH          San Bernardino     CA   Mesonet

            Mesonet station 711SE Silverwood West
            (SCE1711).

1050 PM     Non-Tstm Wnd Gst 7 NNE Lytle Creek       34.35N 117.45W
01/06/2024  M56 MPH          San Bernardino     CA   Mesonet

            Mesonet station SE338 Cajon Lookout
            (SCE338).

1051 PM     Non-Tstm Wnd Gst 13 ESE Big Bear City    34.21N 116.62W
01/06/2024  M92 MPH          San Bernardino     CA   Mesonet

            Mesonet station BCNC1 Burns Canyon.

1100 PM     Non-Tstm Wnd Gst 3 NNE Big Bear City     34.30N 116.82W
01/06/2024  M58 MPH          San Bernardino     CA   Mesonet

            Mesonet station SE585 Doble (SCE585).

1110 PM     Non-Tstm Wnd Gst 2 NNE Crestline         34.28N 117.28W
01/06/2024  M67 MPH          San Bernardino     CA   Mesonet

            Mesonet station 424SE Silverwood Lake
            (SCE1424).

1120 PM     Non-Tstm Wnd Gst 7 WSW Lucerne Valley    34.41N 117.05W
01/06/2024  M61 MPH          San Bernardino     CA   Mesonet

            Mesonet station SE266 Lucerne Valley
            (SCE266).

1220 AM     Non-Tstm Wnd Gst 7 ESE Hesperia          34.37N 117.19W
01/07/2024  M55 MPH          San Bernardino     CA   Mesonet

            Mesonet station 736SE Hesperia Trail
            (SCE1736).

0615 AM     Non-Tstm Wnd Gst 3 S Crestline           34.21N 117.30W
01/07/2024  M71 MPH          San Bernardino     CA   Mesonet

            Mesonet station HF008 Marshall Peak
            (SDHGPA).

1040 PM     Non-Tstm Wnd Gst 4 NE Mt San Jacinto     33.90N 116.68W
01/06/2024  M58 MPH          Riverside          CA   Mesonet

            Mesonet station SE577 Snowcreek Cyn
            (SCE577).

1050 PM     Non-Tstm Wnd Gst 6 ENE Cabazon           33.95N 116.67W
01/06/2024  M56 MPH          Riverside          CA   Mesonet

            Mesonet station 289SE Whitewater (SCE1289).

1100 PM     Non-Tstm Wnd Gst 7 NE Mt San Jacinto     33.93N 116.64W
01/06/2024  M61 MPH          Riverside          CA   Mesonet

            Mesonet station SE581 Whitewater Cyn
            (SCE581).

1140 PM     Non-Tstm Wnd Gst 7 W Desert Hot Springs  33.94N 116.62W
01/06/2024  M61 MPH          Riverside          CA   Mesonet

            Mesonet station 015SE Whitewater (SCE1015).

1250 AM     Non-Tstm Wnd Gst 7 ENE Cabazon           33.95N 116.66W
01/07/2024  M63 MPH          Riverside          CA   Mesonet

            Mesonet station WWAC1 Whitewater RAWS.

0300 AM     Non-Tstm Wnd Gst 7 W Desert Hot Springs  33.94N 116.62W
01/07/2024  M63 MPH          Riverside          CA   Mesonet

            Mesonet station 015SE Whitewater (SCE1015).

0300 AM     Non-Tstm Wnd Gst 1 SE Laguna Beach       33.53N 117.75W
01/07/2024  M54 MPH          Orange             CA   Mesonet

            Mesonet station SE024 Laguna Beach 4
            (SE024).

&&

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 7, 4:12 AM PSTAreal Flood AdvisorySGXSan Bernardino57 min
Jan 7, 10:38 AM PSTFrost AdvisorySGXRiverside, San Diego46 hr
Jan 7, 10:38 AM PSTFreeze WarningSGXRiverside, San Bernardino22 hr
Jan 7, 10:38 AM PSTFreeze WarningSGXRiverside, San Bernardino46 hr
Jan 7, 1:22 PM PSTWind AdvisorySGXOrange, Riverside, San Bernardino, San Diego27 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.