Alert archive / California / Frost Advisories in 2021
Frost Advisory 4, NWS San Diego, CA
NWS San Diego, CA issued this frost advisory at Oct 12, 2021, 12:57 PM PDT for San Bernardino County, California. It took effect at Oct 13, 2021, 12:00 AM PDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Oct 12, 2021, 12:57 PM PDT (19:57 UTC)
- In effect from
- Oct 13, 2021, 12:00 AM PDT
- Expired
- Oct 13, 2021, 9:00 AM PDT
- In force
- 9 hr
- Issued by
- NWS San Diego, CA
County San Bernardino County, CA
The radar
The Edwards AFB radar (KEYX), 129 km from the middle of the area, began a volume at 19:57 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 12:00Z, 8.0 hours before the alert went out and 180 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1720 m above ground
- 0-6 km bulk shear
- 2 kt
- 0-1 km storm-relative helicity
- -80 m²/s²
- 0-3 km storm-relative helicity
- -49 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
879 WWUS76 KSGX 121957 NPWSGX URGENT - WEATHER MESSAGE National Weather Service SAN DIEGO CA 1257 PM PDT Tue Oct 12 2021 CAZ060-130500- /O.NEW.KSGX.FR.Y.0004.211013T0700Z-211013T1600Z/ Apple and Lucerne Valleys- Including the cities of Hesperia and Apple Valley 1257 PM PDT Tue Oct 12 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT WEDNESDAY... * WHAT...Temperatures between 28 and 33 degrees will result in frost formation. * WHERE...Apple and Lucerne Valleys. * WHEN...From midnight tonight to 9 AM PDT Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service visit http://weather.gov/sandiego
2 follow-up statements
189 WWUS76 KSGX 130446 NPWSGX URGENT - WEATHER MESSAGE National Weather Service SAN DIEGO CA 946 PM PDT Tue Oct 12 2021 CAZ060-131300- /O.CON.KSGX.FR.Y.0004.211013T0700Z-211013T1600Z/ Apple and Lucerne Valleys- Including the cities of Hesperia and Apple Valley 946 PM PDT Tue Oct 12 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT WEDNESDAY... * WHAT...Temperatures between 29 and 34 degrees will result in frost formation. * WHERE...Apple and Lucerne Valleys. * WHEN...From midnight tonight to 9 AM PDT Wednesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ Maxwell
505 WWUS76 KSGX 130927 NPWSGX URGENT - WEATHER MESSAGE National Weather Service SAN DIEGO CA 227 AM PDT Wed Oct 13 2021 CAZ060-131600- /O.CON.KSGX.FR.Y.0004.000000T0000Z-211013T1600Z/ Apple and Lucerne Valleys- Including the cities of Hesperia and Apple Valley 227 AM PDT Wed Oct 13 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Temperatures 28 to 34 will result in frost. * WHERE...Apple and Lucerne Valleys. * WHEN...Until 9 AM PDT this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$
Nearby
Frost Advisories in California, 2021Every frost advisory in 2021
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.