Alert archive / California / Frost Advisories in 2021
Frost Advisory 2, NWS San Diego, CA
NWS San Diego, CA issued this frost advisory at Mar 15, 2021, 1:01 PM PDT for Riverside County, San Bernardino County, San Diego County, California. It took effect at Mar 16, 2021, 12:00 AM PDT. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Mar 15, 2021, 1:01 PM PDT (20:01 UTC)
- In effect from
- Mar 16, 2021, 12:00 AM PDT
- Expired
- Mar 16, 2021, 8:17 AM PDT
- In force
- 8 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 20:03 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, 8.0 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
- 14 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 607 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 90 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
686 WWUS76 KSGX 152001 NPWSGX URGENT - WEATHER MESSAGE National Weather Service SAN DIEGO CA 101 PM PDT Mon Mar 15 2021 CAZ055-056-058-060>062-065-160500- /O.CON.KSGX.HW.W.0007.000000T0000Z-210316T1000Z/ San Bernardino County Mountains-Riverside County Mountains- San Diego County Mountains-Apple and Lucerne Valleys- Coachella Valley-San Diego County Deserts- San Gorgonio Pass Near Banning- Including the cities of Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, Pine Valley, Victorville, Hesperia, Apple Valley, Indio, Palm Springs, Cathedral City, Palm Desert, Palm Desert Country, La Quinta, Coachella, Borrego Springs, Banning, and Desert Hot Springs 101 PM PDT Mon Mar 15 2021 ...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 3 AM PDT TUESDAY... * WHAT...West winds 30 to 40 mph with gusts to 60 mph expected. Local gusts to 85 mph in favored locations. * WHERE...San Bernardino County Mountains, San Diego County Deserts, Apple and Lucerne Valleys and Coachella Valley. * WHEN...Until 3 AM PDT Tuesday. * IMPACTS...Damaging winds will blow down trees and power lines. Power outages are possible. Travel will be difficult, especially for high profile vehicles. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use caution if you must drive. && $$ CAZ050-160500- /O.NEW.KSGX.FR.Y.0002.210316T0700Z-210316T1600Z/ /O.EXT.KSGX.WI.Y.0016.000000T0000Z-210316T0800Z/ San Diego County Valleys- Including the cities of Escondido, El Cajon, San Marcos, La Mesa, Santee, and Poway 101 PM PDT Mon Mar 15 2021 ...WIND ADVISORY NOW IN EFFECT UNTIL 1 AM PDT TUESDAY... ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT TUESDAY... * WHAT...For the Frost Advisory, temperatures as low as 33 degrees will result in frost formation. For the Wind Advisory, west winds 15 to 25 mph with gusts to 40 mph. * WHERE...San Diego County Valleys. * WHEN...For the Frost Advisory, from midnight tonight to 9 AM PDT Tuesday. For the Wind Advisory, until 1 AM PDT Tuesday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. Take steps now to protect tender plants from the cold. && $$ CAZ048-160500- /O.NEW.KSGX.FR.Y.0002.210316T0700Z-210316T1600Z/ San Bernardino and Riverside County Valleys-The Inland Empire- Including the cities of Moreno Valley and Rancho Cucamonga 101 PM PDT Mon Mar 15 2021 ...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT TUESDAY... * WHAT...Temperatures as low as 33 degrees will result in frost formation. * WHERE...San Bernardino and Riverside County Valleys-The Inland Empire. * WHEN...From midnight tonight to 9 AM PDT Tuesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ CAZ043-552-554-160500- /O.EXT.KSGX.WI.Y.0016.000000T0000Z-210316T0800Z/ San Diego County Coastal Areas-Orange County Coastal Areas- Orange County Inland Areas- Including the cities of Vista, Carlsbad, Encinitas, Chula Vista, National City, San Diego, Huntington Beach, Costa Mesa, Santa Ana, Anaheim, Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo 101 PM PDT Mon Mar 15 2021 ...WIND ADVISORY NOW IN EFFECT UNTIL 1 AM PDT TUESDAY... * WHAT...West winds 10 to 20 mph with gusts to 35 mph expected. * WHERE...Orange County Coastal Areas, Orange County Inland Areas and San Diego County Coastal Areas. * WHEN...Until 1 AM PDT Tuesday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from the National Weather Service visit http://weather.gov/sandiego
3 follow-up statements
998 WWUS76 KSGX 160349 NPWSGX URGENT - WEATHER MESSAGE National Weather Service SAN DIEGO CA 849 PM PDT Mon Mar 15 2021 CAZ055-056-058-060>062-065-161000- /O.CON.KSGX.HW.W.0007.000000T0000Z-210316T1000Z/ San Bernardino County Mountains-Riverside County Mountains- San Diego County Mountains-Apple and Lucerne Valleys- Coachella Valley-San Diego County Deserts- San Gorgonio Pass Near Banning- Including the cities of Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, Pine Valley, Victorville, Hesperia, Apple Valley, Indio, Palm Springs, Cathedral City, Palm Desert, Palm Desert Country, La Quinta, Coachella, Borrego Springs, Banning, and Desert Hot Springs 849 PM PDT Mon Mar 15 2021 ...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 3 AM PDT TUESDAY... * WHAT...West winds 30 to 40 mph with gusts to 65 mph expected. * WHERE...San Bernardino County Mountains, San Diego County Deserts, Apple and Lucerne Valleys and Coachella Valley. * WHEN...Until 3 AM PDT Tuesday. * IMPACTS...Damaging winds will blow down trees and power lines. Power outages are possible. Travel will be difficult, especially for high profile vehicles. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use caution if you must drive. && $$ CAZ050-161030- /O.CON.KSGX.WI.Y.0016.000000T0000Z-210316T0800Z/ /O.CON.KSGX.FR.Y.0002.210316T0700Z-210316T1600Z/ San Diego County Valleys- Including the cities of Escondido, El Cajon, San Marcos, La Mesa, Santee, and Poway 849 PM PDT Mon Mar 15 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 1 AM PDT TUESDAY... ...FROST ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT TUESDAY... * WHAT...For the Frost Advisory, temperatures as low as 33 degrees will result in frost formation. For the Wind Advisory, west winds 10 to 20 mph with gusts to 35 mph. * WHERE...San Diego County Valleys. * WHEN...For the Frost Advisory, from midnight tonight to 9 AM PDT Tuesday. For the Wind Advisory, until 1 AM PDT Tuesday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. Take steps now to protect tender plants from the cold. && $$ CAZ048-161030- /O.CON.KSGX.FR.Y.0002.210316T0700Z-210316T1600Z/ San Bernardino and Riverside County Valleys-The Inland Empire- Including the cities of Moreno Valley and Rancho Cucamonga 849 PM PDT Mon Mar 15 2021 ...FROST ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT TUESDAY... * WHAT...Temperatures as low as 30 degrees will result in frost formation. * WHERE...San Bernardino and Riverside County Valleys-The Inland Empire. * WHEN...From midnight tonight to 9 AM PDT Tuesday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ CAZ043-552-554-160800- /O.CON.KSGX.WI.Y.0016.000000T0000Z-210316T0800Z/ San Diego County Coastal Areas-Orange County Coastal Areas- Orange County Inland Areas- Including the cities of Vista, Carlsbad, Encinitas, Chula Vista, National City, San Diego, Huntington Beach, Costa Mesa, Santa Ana, Anaheim, Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo 849 PM PDT Mon Mar 15 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 1 AM PDT TUESDAY... * WHAT...West winds 10 to 20 mph with gusts to 40 mph expected. * WHERE...Orange County Coastal Areas, Orange County Inland Areas and San Diego County Coastal Areas. * WHEN...Until 1 AM PDT Tuesday. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ For more information from the National Weather Service visit http://weather.gov/sandiego
983 WWUS76 KSGX 161057 NPWSGX URGENT - WEATHER MESSAGE National Weather Service SAN DIEGO CA 357 AM PDT Tue Mar 16 2021 CAZ055-056-058-060-062-065-161600- /O.NEW.KSGX.WI.Y.0017.210316T1057Z-210316T1600Z/ San Bernardino County Mountains-Riverside County Mountains- San Diego County Mountains-Apple and Lucerne Valleys- San Diego County Deserts-San Gorgonio Pass Near Banning- Including the cities of Julian, Borrego Springs, and Desert Hot Springs 357 AM PDT Tue Mar 16 2021 ...WIND ADVISORY IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...West winds 20 to 30 mph with gusts to 55 mph. * WHERE...Mostly along the east slopes of the mountains into the adjacent desert areas. * WHEN...Until 9 AM PDT this morning. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...Winds will gradually diminish through the morning. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ CAZ048-050-161600- /O.CON.KSGX.FR.Y.0002.000000T0000Z-210316T1600Z/ San Bernardino and Riverside County Valleys-The Inland Empire- San Diego County Valleys- Including the cities of Moreno Valley and Rancho Cucamonga 357 AM PDT Tue Mar 16 2021 ...FROST ADVISORY REMAINS IN EFFECT UNTIL 9 AM PDT THIS MORNING... * WHAT...Temperatures will fall into the lower to mid 30s for a few hours around sunrise, resulting in frost formation. * WHERE...Inland San Diego County valleys near the foothills and portions of the Inland Empire. * WHEN...Until 9 AM PDT this morning. * IMPACTS...Frost could kill sensitive outdoor vegetation if left uncovered. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. && $$ For more information from the National Weather Service visit http://weather.gov/sandiego 17
818 WWUS76 KSGX 161517 NPWSGX URGENT - WEATHER MESSAGE National Weather Service SAN DIEGO CA 817 AM PDT Tue Mar 16 2021 CAZ048-050-161630- /O.CAN.KSGX.FR.Y.0002.000000T0000Z-210316T1600Z/ San Bernardino and Riverside County Valleys-The Inland Empire- San Diego County Valleys- 817 AM PDT Tue Mar 16 2021 ...FROST ADVISORY IS CANCELLED... $$ CAZ055-056-058-060-062-065-161630- /O.CAN.KSGX.WI.Y.0017.000000T0000Z-210316T1600Z/ San Bernardino County Mountains-Riverside County Mountains- San Diego County Mountains-Apple and Lucerne Valleys- San Diego County Deserts-San Gorgonio Pass Near Banning- 817 AM PDT Tue Mar 16 2021 ...WIND ADVISORY IS CANCELLED... Winds have fallen below Advisory criteria most areas and will continue to decrease this morning. $$ For more information from the National Weather Service visit http://weather.gov/sandiego
The office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 15, 1:43 AM PDT | High Surf Advisory | SGX | Orange, San Diego | 20 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; radar from the NEXRAD Level II archive.