Alert archive / California / Frost Advisories in 2021
Frost Advisory 9, NWS Los Angeles, CA
NWS Los Angeles, CA issued this frost advisory at Dec 14, 2021, 9:47 PM PST for Los Angeles County, California. It took effect at Dec 15, 2021, 3:00 AM PST. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Dec 14, 2021, 9:47 PM PST (05:47 UTC)
- In effect from
- Dec 15, 2021, 3:00 AM PST
- Expired
- Dec 15, 2021, 9:00 AM PST
- In force
- 6 hr
- Issued by
- NWS Los Angeles, CA
County Los Angeles County, CA
The nearest sounding before it
San Diego, CA (KNKX), launched 00:00Z, 5.8 hours before the alert went out and 184 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
- 5 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 470 m above ground
- 0-6 km bulk shear
- 79 kt
- 0-1 km storm-relative helicity
- -121 m²/s²
- 0-3 km storm-relative helicity
- 224 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
941 WWUS76 KLOX 150547 NPWLOX URGENT - WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 947 PM PST Tue Dec 14 2021 CAZ036-044-045-088-547-151400- /O.UPG.KLOX.FR.Y.0008.211215T1100Z-211215T1700Z/ /O.NEW.KLOX.FZ.W.0004.211215T1100Z-211215T1700Z/ Santa Ynez Valley-Ventura County Interior Valleys- Ventura County Coastal Valleys-Santa Clarita Valley- Los Angeles County San Fernando Valley- Including the cities of Solvang, Santa Ynez, Santa Paula, Fillmore, Ojai, Piru, Thousand Oaks, Simi Valley, Moorpark, Newbury Park, Santa Clarita, Newhall, Valencia, Woodland Hills, Northridge, Burbank, and Universal City 947 PM PST Tue Dec 14 2021 ...FREEZE WARNING IN EFFECT FROM 3 AM TO 9 AM PST WEDNESDAY... * WHAT...Sub-freezing temperatures between 27 and 31 degrees are expected. * WHERE...Santa Ynez Valley, Ventura County Interior Valleys, Ventura County Coastal Valleys, Santa Clarita Valley and San Fernando Valley. * WHEN...From 3 AM to 9 AM PST Wednesday. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. Extended exposure to cold can cause hypothermia for animals and people. Vehicle windshields will be frosted. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Plan for extra time to defrost vehicle windshields. && $$ CAZ039-151400- /O.NEW.KLOX.FR.Y.0009.211215T1100Z-211215T1700Z/ /O.CON.KLOX.WI.Y.0122.000000T0000Z-211215T1100Z/ Santa Barbara County South Coast- Including the cities of Santa Barbara, Montecito, and Carpinteria 947 PM PST Tue Dec 14 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 3 AM PST WEDNESDAY... ...FROST ADVISORY IN EFFECT FROM 3 AM TO 9 AM PST WEDNESDAY... * WHAT...For the Frost Advisory, Temperatures as low as 31 in wind sheltered areas will result in frost formation. For the Wind Advisory, northwest winds 10 to 20 mph. * WHERE...Santa Barbara County South Coast. * WHEN...For the Frost Advisory, from 3 AM to 9 AM PST Wednesday. For the Wind Advisory, until 3 AM PST Wednesday. * IMPACTS...Gusty winds will blow around unsecured objects and make driving difficult, especially for high profile vehicles. Tree limbs could be blown down and a few power outages may result. Frost can damage sensitive plants and harm pets if left unprotected. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. Take steps now to protect tender plants from the cold. && $$ CAZ034-035-040-151400- /O.NEW.KLOX.FR.Y.0009.211215T1100Z-211215T1700Z/ San Luis Obispo County Central Coast- Santa Barbara County Central Coast-Ventura County Coast- Including the cities of San Luis Obispo, Pismo Beach, Morro Bay, Cambria, San Simeon, Santa Maria, Lompoc, Vandenberg, Ventura, Oxnard, and Camarillo 947 PM PST Tue Dec 14 2021 ...FROST ADVISORY IN EFFECT FROM 3 AM TO 9 AM PST WEDNESDAY... * WHAT...Temperatures as low as 31 will result in frost formation. * WHERE...San Luis Obispo County Central Coast, Santa Barbara County Central Coast and Ventura County Coast. * WHEN...From 3 AM to 9 AM PST Wednesday. * IMPACTS...Frost can damage sensitive plants and harm pets if left unprotected. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ CAZ052-151100- /O.CON.KLOX.WI.Y.0122.000000T0000Z-211215T1100Z/ Santa Barbara County Mountains- Including the cities of San Marcos Pass, San Rafael Wilderness Area, and Dick Smith Wilderness Area 947 PM PST Tue Dec 14 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 3 AM PST WEDNESDAY... * WHAT...North to northwest winds 20 to 30 mph with gusts to 45 mph with local gusts to 50 mph possible below favored passes and canyons, especially around Montecito. * WHERE...Santa Barbara County South Coast and Mountains. * WHEN...Until 3 AM PST Wednesday. * IMPACTS...Gusty winds will blow around unsecured objects and make driving difficult, especially for high profile vehicles. Roadways may be affected by gusty cross winds. This includes Highways 101, 154 and 192. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ ASR
3 follow-up statements
738 WWUS76 KLOX 150604 NPWLOX URGENT - WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 1004 PM PST Tue Dec 14 2021 CAZ036-044-045-088-547-151415- /O.CON.KLOX.FZ.W.0004.211215T1100Z-211215T1700Z/ Santa Ynez Valley-Ventura County Interior Valleys- Ventura County Coastal Valleys-Santa Clarita Valley- Los Angeles County San Fernando Valley- Including the cities of Solvang, Santa Ynez, Santa Paula, Fillmore, Ojai, Piru, Thousand Oaks, Simi Valley, Moorpark, Newbury Park, Santa Clarita, Newhall, Valencia, Woodland Hills, Northridge, Burbank, and Universal City 1004 PM PST Tue Dec 14 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM 3 AM TO 9 AM PST WEDNESDAY... * WHAT...Sub-freezing temperatures between 27 and 31 degrees are expected. * WHERE...Santa Ynez Valley, Ventura County Interior Valleys, Ventura County Coastal Valleys, Santa Clarita Valley and San Fernando Valley. * WHEN...From 3 AM to 9 AM PST Wednesday. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. Extended exposure to cold can cause hypothermia for animals and people. Vehicle windshields will be frosted. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Plan for extra time to defrost vehicle windshields. && $$ CAZ548-151415- /O.EXA.KLOX.FR.Y.0009.211215T1100Z-211215T1700Z/ Los Angeles County San Gabriel Valley- Including the cities of Pasadena, San Gabriel, and Pomona 1004 PM PST Tue Dec 14 2021 ...FROST ADVISORY IN EFFECT FROM 3 AM TO 9 AM PST WEDNESDAY... * WHAT...Temperatures as low as 31 will result in frost formation. * WHERE...San Gabriel Valley. * WHEN...From 3 AM to 9 AM PST Wednesday. * IMPACTS...Frost can damage sensitive plants and harm pets if left unprotected. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ CAZ039-151415- /O.CON.KLOX.WI.Y.0122.000000T0000Z-211215T1100Z/ /O.CON.KLOX.FR.Y.0009.211215T1100Z-211215T1700Z/ Santa Barbara County South Coast- Including the cities of Santa Barbara, Montecito, and Carpinteria 1004 PM PST Tue Dec 14 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 3 AM PST WEDNESDAY... ...FROST ADVISORY REMAINS IN EFFECT FROM 3 AM TO 9 AM PST WEDNESDAY... * WHAT...For the Frost Advisory, Temperatures as low as 31 in wind sheltered areas will result in frost formation. For the Wind Advisory, northwest winds 10 to 20 mph. * WHERE...Santa Barbara County South Coast. * WHEN...For the Wind Advisory, until 3 AM PST Wednesday. For the Frost Advisory, from 3 AM to 9 AM PST Wednesday. * IMPACTS...Gusty winds will blow around unsecured objects and make driving difficult, especially for high profile vehicles. Tree limbs could be blown down and a few power outages may result. Frost can damage sensitive plants and harm pets if left unprotected. 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. && $$ CAZ034-035-040-151415- /O.CON.KLOX.FR.Y.0009.211215T1100Z-211215T1700Z/ San Luis Obispo County Central Coast- Santa Barbara County Central Coast-Ventura County Coast- Including the cities of San Luis Obispo, Pismo Beach, Morro Bay, Cambria, San Simeon, Santa Maria, Lompoc, Vandenberg, Ventura, Oxnard, and Camarillo 1004 PM PST Tue Dec 14 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM 3 AM TO 9 AM PST WEDNESDAY... * WHAT...Temperatures as low as 31 will result in frost formation. * WHERE...San Luis Obispo County Central Coast, Santa Barbara County Central Coast and Ventura County Coast. * WHEN...From 3 AM to 9 AM PST Wednesday. * IMPACTS...Frost can damage sensitive plants and harm pets if left unprotected. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ CAZ052-151100- /O.CON.KLOX.WI.Y.0122.000000T0000Z-211215T1100Z/ Santa Barbara County Mountains- Including the cities of San Marcos Pass, San Rafael Wilderness Area, and Dick Smith Wilderness Area 1004 PM PST Tue Dec 14 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 3 AM PST WEDNESDAY... * WHAT...North to northwest winds 20 to 30 mph with gusts to 45 mph with local gusts to 50 mph possible below favored passes and canyons, especially around Montecito. * WHERE...Santa Barbara County South Coast and Mountains. * WHEN...Until 3 AM PST Wednesday. * IMPACTS...Gusty winds will blow around unsecured objects and make driving difficult, especially for high profile vehicles. Roadways may be affected by gusty cross winds. This includes Highways 101, 154 and 192. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ Phillips
437 WWUS76 KLOX 151115 NPWLOX URGENT - WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 315 AM PST Wed Dec 15 2021 CAZ039-151700- /O.EXP.KLOX.WI.Y.0122.000000T0000Z-211215T1100Z/ /O.CON.KLOX.FR.Y.0009.000000T0000Z-211215T1700Z/ Santa Barbara County South Coast- Including the cities of Santa Barbara, Montecito, and Carpinteria 315 AM PST Wed Dec 15 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING... ...WIND ADVISORY HAS EXPIRED... * WHAT...Temperatures as low as 37 will result in frost formation. * WHERE...Santa Barbara County South Coast. * WHEN...Until 9 AM PST this morning. * IMPACTS...Frost can damage sensitive plants and harm pets if left unprotected. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ CAZ052-151215- /O.EXP.KLOX.WI.Y.0122.000000T0000Z-211215T1100Z/ Santa Barbara County Mountains- Including the cities of San Marcos Pass, San Rafael Wilderness Area, and Dick Smith Wilderness Area 315 AM PST Wed Dec 15 2021 ...WIND ADVISORY HAS EXPIRED... The winds have diminished to below advisory levels. $$ CAZ036-044-045-088-547-151700- /O.CON.KLOX.FZ.W.0004.000000T0000Z-211215T1700Z/ Santa Ynez Valley-Ventura County Interior Valleys- Ventura County Coastal Valleys-Santa Clarita Valley- Los Angeles County San Fernando Valley- Including the cities of Solvang, Santa Ynez, Santa Paula, Fillmore, Ojai, Piru, Thousand Oaks, Simi Valley, Moorpark, Newbury Park, Santa Clarita, Newhall, Valencia, Woodland Hills, Northridge, Burbank, and Universal City 315 AM PST Wed Dec 15 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING... * WHAT...Sub-freezing temperatures between 27 and 31 degrees are expected. * WHERE...Santa Ynez Valley, Ventura County Interior Valleys, Ventura County Coastal Valleys, Santa Clarita Valley and San Fernando Valley. * WHEN...Until 9 AM PST this morning. * IMPACTS...Frost and freeze conditions will kill crops and other sensitive vegetation. Extended exposure to cold can cause hypothermia for animals and people. Vehicle windshields will be frosted. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. Plan for extra time to defrost vehicle windshields. && $$ CAZ034-035-040-548-151700- /O.CON.KLOX.FR.Y.0009.000000T0000Z-211215T1700Z/ San Luis Obispo County Central Coast- Santa Barbara County Central Coast-Ventura County Coast- Los Angeles County San Gabriel Valley- Including the cities of San Luis Obispo, Pismo Beach, Morro Bay, Cambria, San Simeon, Santa Maria, Lompoc, Vandenberg, Ventura, Oxnard, Camarillo, Pasadena, San Gabriel, and Pomona 315 AM PST Wed Dec 15 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PST THIS MORNING... * WHAT...Temperatures as low as 31 will result in frost formation. * WHERE...San Luis Obispo County Central Coast, Santa Barbara County Central Coast and Ventura County Coast. * WHEN...Until 9 AM PST this morning. * IMPACTS...Frost can damage sensitive plants and harm pets if left unprotected. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ ASR
854 WWUS76 KLOX 151701 NPWLOX URGENT - WEATHER MESSAGE National Weather Service Los Angeles/Oxnard CA 901 AM PST Wed Dec 15 2021 CAZ036-044-045-088-547-151815- /O.EXP.KLOX.FZ.W.0004.000000T0000Z-211215T1700Z/ Santa Ynez Valley-Ventura County Interior Valleys- Ventura County Coastal Valleys-Santa Clarita Valley- Los Angeles County San Fernando Valley- Including the cities of Solvang, Santa Ynez, Santa Paula, Fillmore, Ojai, Piru, Thousand Oaks, Simi Valley, Moorpark, Newbury Park, Santa Clarita, Newhall, Valencia, Woodland Hills, Northridge, Burbank, and Universal City 901 AM PST Wed Dec 15 2021 ...FREEZE WARNING HAS EXPIRED... Freeze conditions are no longer occurring. $$ CAZ034-035-039-040-548-151815- /O.EXP.KLOX.FR.Y.0009.000000T0000Z-211215T1700Z/ San Luis Obispo County Central Coast- Santa Barbara County Central Coast- Santa Barbara County South Coast-Ventura County Coast- Los Angeles County San Gabriel Valley- Including the cities of San Luis Obispo, Pismo Beach, Morro Bay, Cambria, San Simeon, Santa Maria, Lompoc, Vandenberg, Santa Barbara, Montecito, Carpinteria, Ventura, Oxnard, Camarillo, Pasadena, San Gabriel, and Pomona 901 AM PST Wed Dec 15 2021 ...FROST ADVISORY HAS EXPIRED... Frost conditions are no longer occurring. $$
The office that day
Everything else NWS Los Angeles, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 14, 8:26 PM PST | Frost Advisory | LOX | Los Angeles | 81 min |
| Dec 14, 9:47 PM PST | Freeze Warning | LOX | Los Angeles | 11 hr |
| Dec 14, 10:17 PM PST | High Surf Advisory | LOX | 16 hr |
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.