Alert archive / California / Frost Advisories in 2021
Frost Advisory 7, NWS San Diego, CA
NWS San Diego, CA issued this frost advisory at Dec 18, 2021, 1:47 AM PST for Riverside County, San Bernardino County, San Diego County, California. It took effect at Dec 18, 2021, 10:00 PM PST. It was in force for 10 hr.
The area
The counties it named.
The facts
- Issued
- Dec 18, 2021, 1:47 AM PST (09:47 UTC)
- In effect from
- Dec 18, 2021, 10:00 PM PST
- Expired
- Dec 19, 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 09:49 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, 9.8 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
- 1584 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- -17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
485 WWUS76 KSGX 180947 NPWSGX URGENT - WEATHER MESSAGE National Weather Service SAN DIEGO CA 147 AM PST Sat Dec 18 2021 CAZ061-181800- /O.CAN.KSGX.FR.Y.0006.000000T0000Z-211218T1700Z/ /O.NEW.KSGX.FR.Y.0007.211219T0600Z-211219T1600Z/ Coachella Valley- Including the cities of Indio, Palm Springs, Cathedral City, Palm Desert, Palm Desert Country, La Quinta, and Coachella 147 AM PST Sat Dec 18 2021 ...FROST ADVISORY IN EFFECT FROM 10 PM THIS EVENING TO 8 AM PST SUNDAY... * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Coachella Valley. * WHEN...From 10 PM this evening to 8 AM PST Sunday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ CAZ554-181100- /O.CAN.KSGX.WI.Y.0040.000000T0000Z-211218T1200Z/ Orange County Inland Areas- 147 AM PST Sat Dec 18 2021 ...WIND ADVISORY IS CANCELLED... Light winds expected tonight. $$ CAZ048-181800- /O.NEW.KSGX.FR.Y.0007.211219T0600Z-211219T1600Z/ /O.EXT.KSGX.FR.Y.0006.000000T0000Z-211218T1600Z/ /O.EXT.KSGX.WI.Y.0040.000000T0000Z-211218T2000Z/ San Bernardino and Riverside County Valleys-The Inland Empire- Including the cities of Riverside, San Bernardino, Ontario, Moreno Valley, Fontana, Rancho Cucamonga, and Corona 147 AM PST Sat Dec 18 2021 ...FROST ADVISORY NOW IN EFFECT UNTIL 8 AM PST THIS MORNING... ...WIND ADVISORY NOW IN EFFECT UNTIL NOON PST TODAY... ...FROST ADVISORY IN EFFECT FROM 10 PM THIS EVENING TO 8 AM PST SUNDAY... * WHAT...For the Frost Advisory, temperatures as low as 35 will result in frost formation. For the Wind Advisory, northeast winds 10 to 15 mph with gusts to 30 mph. For the Frost Advisory, temperatures as low as 32 will result in frost formation. * WHERE...For the Wind Advisory, below passes and canyons. For the frost Advisory in wind-sheltered valleys. * WHEN...For the Frost Advisory, until 8 AM PST each morning. For the Wind Advisory, until noon PST today. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down. Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. Take steps now to protect tender plants from the cold. && $$ CAZ050-062-181800- /O.NEW.KSGX.FR.Y.0007.211219T0600Z-211219T1600Z/ /O.EXT.KSGX.FR.Y.0006.000000T0000Z-211218T1600Z/ San Diego County Valleys-San Diego County Deserts- Including the cities of Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, and Borrego Springs 147 AM PST Sat Dec 18 2021 ...FROST ADVISORY NOW IN EFFECT UNTIL 8 AM PST THIS MORNING... ...FROST ADVISORY IN EFFECT FROM 10 PM THIS EVENING TO 8 AM PST SUNDAY... * WHAT...For the Frost Advisory, temperatures as low as 32 will result in frost formation. * WHERE...San Diego County Valleys and San Diego County Deserts. * WHEN...Until 8 AM PST each morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ CAZ055>057-065-181800- /O.EXT.KSGX.WI.Y.0040.000000T0000Z-211218T2000Z/ San Bernardino County Mountains-Riverside County Mountains- Santa Ana Mountains and Foothills-San Gorgonio Pass Near Banning- 147 AM PST Sat Dec 18 2021 ...WIND ADVISORY NOW IN EFFECT UNTIL NOON PST TODAY... * WHAT...Northeast winds 15 to 25 mph with local gusts 35 to 45 mph expected. * WHERE...Gusty winds may occur in the Cajon and Banning Passes today. Santa Ana Mountains and Foothills, San Gorgonio Pass Near Banning and Orange County Inland Areas. * WHEN...Until noon PST today. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from the National Weather Service visit http://weather.gov/sandiego
4 follow-up statements
832 WWUS76 KSGX 181236 NPWSGX URGENT - WEATHER MESSAGE National Weather Service SAN DIEGO CA 436 AM PST Sat Dec 18 2021 CAZ048-182045- /O.CON.KSGX.FR.Y.0006.000000T0000Z-211218T1600Z/ /O.CON.KSGX.WI.Y.0040.000000T0000Z-211218T2000Z/ /O.CON.KSGX.FR.Y.0007.211219T0600Z-211219T1600Z/ San Bernardino and Riverside County Valleys-The Inland Empire- Including the cities of Riverside, San Bernardino, Ontario, Moreno Valley, Fontana, Rancho Cucamonga, and Corona 436 AM PST Sat Dec 18 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING... ...WIND ADVISORY REMAINS IN EFFECT UNTIL NOON PST TODAY... ...FROST ADVISORY REMAINS IN EFFECT FROM 10 PM THIS EVENING TO 8 AM PST SUNDAY... * WHAT...For the Frost Advisory, temperatures as low as 32 will result in frost formation. For the Wind Advisory, northeast winds 15 to 25 mph with peak gusts to 35 to 40 mph. * WHERE...For the Wind Advisory, below passes and canyons. For the frost Advisory in wind-sheltered valleys. * WHEN...For the Frost Advisory, until 8 AM PST each morning. For the Wind Advisory, until noon PST today. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down. Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. Take steps now to protect tender plants from the cold. && $$ CAZ050-062-182045- /O.CON.KSGX.FR.Y.0006.000000T0000Z-211218T1600Z/ /O.CON.KSGX.FR.Y.0007.211219T0600Z-211219T1600Z/ San Diego County Valleys-San Diego County Deserts- Including the cities of Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, and Borrego Springs 436 AM PST Sat Dec 18 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING... ...FROST ADVISORY REMAINS IN EFFECT FROM 10 PM THIS EVENING TO 8 AM PST SUNDAY... * WHAT...For the Frost Advisory, temperatures as low as 28 will result in frost formation. * WHERE...San Diego County Valleys and San Diego County Deserts. * WHEN...Until 8 AM PST each morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ CAZ061-182045- /O.CON.KSGX.FR.Y.0007.211219T0600Z-211219T1600Z/ Coachella Valley- Including the cities of Indio, Palm Springs, Cathedral City, Palm Desert, Palm Desert Country, La Quinta, and Coachella 436 AM PST Sat Dec 18 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 10 PM THIS EVENING TO 8 AM PST SUNDAY... * WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...Coachella Valley. * WHEN...From 10 PM this evening to 8 AM PST Sunday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ CAZ055>057-065-182000- /O.CON.KSGX.WI.Y.0040.000000T0000Z-211218T2000Z/ San Bernardino County Mountains-Riverside County Mountains- Santa Ana Mountains and Foothills-San Gorgonio Pass Near Banning- 436 AM PST Sat Dec 18 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL NOON PST TODAY... * WHAT...Northeast winds 15 to 25 mph with local gusts 35 to 45 mph expected. * WHERE...Gusty winds may occur in the Cajon and Banning Passes today. Santa Ana Mountains and Foothills, San Gorgonio Pass Near Banning and Orange County Inland Areas. * WHEN...Until noon PST today. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from the National Weather Service visit http://weather.gov/sandiego
042 WWUS76 KSGX 182140 NPWSGX URGENT - WEATHER MESSAGE National Weather Service SAN DIEGO CA 140 PM PST Sat Dec 18 2021 CAZ048-050-061-062-191300- /O.CON.KSGX.FR.Y.0007.211219T0600Z-211219T1600Z/ San Bernardino and Riverside County Valleys-The Inland Empire- San Diego County Valleys-Coachella Valley- San Diego County Deserts- Including the cities of Riverside, San Bernardino, Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, Indio, Palm Springs, Cathedral City, Palm Desert, Palm Desert Country, La Quinta, Coachella, and Borrego Springs 140 PM PST Sat Dec 18 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 10 PM THIS EVENING TO 8 AM PST SUNDAY... * WHAT...For the Frost Advisory, temperatures as low as 28 will result in frost formation. * WHERE...The Inland Empire, San Diego County Valleys and San Diego County Deserts. * WHEN...10 PM this evening through 8 AM Sunday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service visit http://weather.gov/sandiego
282 WWUS76 KSGX 190447 NPWSGX URGENT - WEATHER MESSAGE National Weather Service SAN DIEGO CA 847 PM PST Sat Dec 18 2021 CAZ048-050-061-062-191400- /O.CON.KSGX.FR.Y.0007.211219T0600Z-211219T1600Z/ San Bernardino and Riverside County Valleys-The Inland Empire- San Diego County Valleys-Coachella Valley- San Diego County Deserts- Including the cities of Riverside, San Bernardino, Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, Indio, Palm Springs, Cathedral City, Palm Desert, Palm Desert Country, La Quinta, Coachella, and Borrego Springs 847 PM PST Sat Dec 18 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST SUNDAY... * 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. && $$ jmb For more information from the National Weather Service visit http://weather.gov/sandiego
101 WWUS76 KSGX 191028 NPWSGX URGENT - WEATHER MESSAGE National Weather Service SAN DIEGO CA 228 AM PST Sun Dec 19 2021 CAZ048-061-062-191830- /O.NEW.KSGX.FR.Y.0008.211220T0600Z-211220T1600Z/ /O.CON.KSGX.FR.Y.0007.000000T0000Z-211219T1600Z/ San Bernardino and Riverside County Valleys-The Inland Empire- Coachella Valley-San Diego County Deserts- Including the cities of Riverside, San Bernardino, Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, Indio, Palm Springs, Cathedral City, Palm Desert, Palm Desert Country, La Quinta, Coachella, and Borrego Springs 228 AM PST Sun Dec 19 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING... ...FROST ADVISORY IN EFFECT FROM 10 PM THIS EVENING TO 8 AM PST MONDAY... * WHAT...Temperatures as low as 28 will result in frost formation. * WHERE...San Bernardino and Riverside County Valleys-The Inland Empire, Coachella Valley and San Diego County Deserts. * WHEN...For the Frost Advisory, until 8 AM PST this morning and again overnight until 8 AM PST Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. *PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ 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
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.