Alert archive / California / Frost Advisories in 2021
Frost Advisory 8, NWS San Diego, CA
NWS San Diego, CA issued this frost advisory at Dec 19, 2021, 2:28 AM PST for Riverside County, San Bernardino County, San Diego County, California. It took effect at Dec 19, 2021, 10:00 PM PST. It was in force for 10 hr.
The area
The counties it named.
The facts
- Issued
- Dec 19, 2021, 2:28 AM PST (10:28 UTC)
- In effect from
- Dec 19, 2021, 10:00 PM PST
- Expired
- Dec 20, 2021, 8:00 AM PST
- In force
- 10 hr
- Issued by
- NWS San Diego, CA
Counties Riverside County, CA, San Bernardino County, CA, San Diego County, CA
The radar
The Santa Ana Mts radar (KSOX), 122 km from the middle of the area, began a volume at 10:30 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 00:00Z, 10.5 hours before the alert went out and 145 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
- 3393 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- 8 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
101 WWUS76 KSGX 191028 NPWSGX URGENT - WEATHER MESSAGE National Weather Service SAN DIEGO CA 228 AM PST Sun Dec 19 2021 CAZ048-061-062-191830- /O.NEW.KSGX.FR.Y.0008.211220T0600Z-211220T1600Z/ /O.CON.KSGX.FR.Y.0007.000000T0000Z-211219T1600Z/ San Bernardino and Riverside County Valleys-The Inland Empire- Coachella Valley-San Diego County Deserts- Including the cities of Riverside, San Bernardino, Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, Indio, Palm Springs, Cathedral City, Palm Desert, Palm Desert Country, La Quinta, Coachella, and Borrego Springs 228 AM PST Sun Dec 19 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING... ...FROST ADVISORY IN EFFECT FROM 10 PM THIS EVENING TO 8 AM PST MONDAY... * WHAT...Temperatures as low as 28 will result in frost formation. * WHERE...San Bernardino and Riverside County Valleys-The Inland Empire, Coachella Valley and San Diego County Deserts. * WHEN...For the Frost Advisory, until 8 AM PST this morning and again overnight until 8 AM PST Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. *PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ CAZ050-191600- /O.CON.KSGX.FR.Y.0007.000000T0000Z-211219T1600Z/ San Diego County Valleys- Including the cities of Escondido, El Cajon, San Marcos, La Mesa, Santee, and Poway 228 AM PST Sun Dec 19 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING... * WHAT...Temperatures as low as 28 will result in frost formation. * WHERE...The Inland Empire, San Diego County Valleys and San Diego County Deserts. * WHEN...Through 8 AM Sunday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service visit http://weather.gov/sandiego
3 follow-up statements
261 WWUS76 KSGX 192138 NPWSGX URGENT - WEATHER MESSAGE National Weather Service SAN DIEGO CA 138 PM PST Sun Dec 19 2021 CAZ048-061-062-201600- /O.CON.KSGX.FR.Y.0008.211220T0600Z-211220T1600Z/ San Bernardino and Riverside County Valleys-The Inland Empire- Coachella Valley-San Diego County Deserts- Including the cities of Riverside, San Bernardino, Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, Indio, Palm Springs, Cathedral City, Palm Desert, Palm Desert Country, La Quinta, Coachella, and Borrego Springs 138 PM PST Sun Dec 19 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 10 PM THIS EVENING TO 8 AM PST MONDAY... * WHAT...Temperatures as low as 28 will result in frost formation. * WHERE...San Bernardino and Riverside County Valleys-The Inland Empire, Coachella Valley and San Diego County Deserts. * WHEN...10 PM this evening through 8 AM Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service visit http://weather.gov/sandiego
728 WWUS76 KSGX 200501 NPWSGX URGENT - WEATHER MESSAGE National Weather Service SAN DIEGO CA 901 PM PST Sun Dec 19 2021 CAZ048-061-062-201400- /O.CON.KSGX.FR.Y.0008.211220T0600Z-211220T1600Z/ San Bernardino and Riverside County Valleys-The Inland Empire- Coachella Valley-San Diego County Deserts- Including the cities of Riverside, San Bernardino, Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, Indio, Palm Springs, Cathedral City, Palm Desert, Palm Desert Country, La Quinta, Coachella, and Borrego Springs 901 PM PST Sun Dec 19 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST MONDAY... * WHAT...Temperatures as low as 28 will result in frost formation. * WHERE...San Bernardino and Riverside County Valleys-The Inland Empire, Coachella Valley and San Diego County Deserts. * WHEN...Through 8 AM Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ jmb For more information from the National Weather Service visit http://weather.gov/sandiego
102 WWUS76 KSGX 201219 NPWSGX URGENT - WEATHER MESSAGE National Weather Service SAN DIEGO CA 419 AM PST Mon Dec 20 2021 CAZ048-061-062-201600- /O.CON.KSGX.FR.Y.0008.000000T0000Z-211220T1600Z/ San Bernardino and Riverside County Valleys-The Inland Empire- Coachella Valley-San Diego County Deserts- Including the cities of Riverside, San Bernardino, Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, Indio, Palm Springs, Cathedral City, Palm Desert, Palm Desert Country, La Quinta, Coachella, and Borrego Springs 419 AM PST Mon Dec 20 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING... * WHAT...Temperatures as low as 28 will result in frost formation. * WHERE...San Bernardino and Riverside County Valleys-The Inland Empire, Coachella Valley and San Diego County Deserts. Frost will be more patchy in western San Diego County. * WHEN...Through 8 AM Monday. * 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
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.