Alert archive / California / Frost Advisories in 2021

Frost Advisory 3, NWS San Diego, CA

October 11, 2021San Bernardino County, California

NWS San Diego, CA issued this frost advisory at Oct 11, 2021, 2:46 AM PDT for San Bernardino County, California. It took effect at Oct 12, 2021, 12:00 AM PDT. It was in force for .

The area

The counties it named.

The facts

Issued
Oct 11, 2021, 2:46 AM PDT (09:46 UTC)
In effect from
Oct 12, 2021, 12:00 AM PDT
Expired
Oct 11, 2021, 11:20 AM PDT
In force
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 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

Las Vegas, NV (KVEF), launched 00:00Z, 9.8 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.

Skew-T log-pSkew-T log-p diagram, Las Vegas, NV at 00:00Z on 2021-10-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 00:00Z on 2021-10-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3086 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
47 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

368 
WWUS76 KSGX 110946
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service SAN DIEGO CA
246 AM PDT Mon Oct 11 2021

CAZ060-112100-
/O.NEW.KSGX.FR.Y.0003.211012T0700Z-211012T1600Z/
/O.CON.KSGX.HW.W.0008.211011T1800Z-211012T1000Z/
Apple and Lucerne Valleys-
Including the cities of Victorville, Hesperia, and Apple Valley
246 AM PDT Mon Oct 11 2021

...HIGH WIND WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
3 AM PDT TUESDAY...
...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM PDT
TUESDAY...

* WHAT...For the High Wind Warning, west winds 25 to 35 mph with
  gusts to 55 mph expected. For the Frost Advisory, temperatures
  as low as 30 in low-lying areas will result in frost formation.

* WHERE...Apple and Lucerne Valleys.

* WHEN...For the High Wind Warning, from 11 AM this morning to 3 
  AM PDT Tuesday. For the Frost Advisory, from midnight tonight 
  to 9 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. Frost could kill sensitive outdoor
  vegetation if left unprotected.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use caution if you must drive.

Take steps now to protect tender plants from the cold.

&&

$$

CAZ055-056-058-112100-
/O.CON.KSGX.HW.W.0008.211011T1800Z-211012T1000Z/
San Bernardino County Mountains-Riverside County Mountains-
San Diego County Mountains-
Including the cities of Crestline, Lake Arrowhead, Big Bear City,
Big Bear Lake, Running Springs, Wrightwood, Idyllwild-Pine Cove, 
Julian, and Pine Valley
246 AM PDT Mon Oct 11 2021

...HIGH WIND WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
3 AM PDT TUESDAY...

* WHAT...West winds 30 to 40 mph with gusts to 70 mph expected.

* WHERE...San Bernardino County Mountains, Riverside County 
  Mountains and San Diego County Mountains.

* WHEN...From 11 AM this morning to 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.

&&

$$

CAZ043-048-050-057-061-062-065-552-554-112100-
/O.CON.KSGX.WI.Y.0034.211011T2000Z-211012T1000Z/
San Diego County Coastal Areas-
San Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Valleys-Santa Ana Mountains and Foothills-
Coachella Valley-San Diego County Deserts-
San Gorgonio Pass Near Banning-Orange County Coastal Areas-
Orange County Inland Areas-
Including the cities of Vista, Carlsbad, Encinitas, Chula Vista, 
National City, San Diego, 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, Borrego Springs, Banning, 
Desert Hot Springs, Huntington Beach, Costa Mesa, Santa Ana, 
Anaheim, Garden Grove, Irvine, Orange, Fullerton, 
and Mission Viejo
246 AM PDT Mon Oct 11 2021

...WIND ADVISORY REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO
3 AM PDT TUESDAY...

* WHAT...West winds 15 to 25 mph with gusts to 35 mph expected.

* WHERE...San Diego County Deserts, Coachella Valley, San 
  Gorgonio Pass Near Banning, Orange County Coastal Areas, San 
  Diego County Valleys, Santa Ana Mountains and Foothills, 
  Orange County Inland Areas, San Diego County Coastal Areas and 
  San Bernardino and Riverside County Valleys-The Inland Empire.

* WHEN...From 1 PM this afternoon to 3 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.

&&

$$
2 follow-up statements
369 
WWUS76 KSGX 111427
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service SAN DIEGO CA
727 AM PDT Mon Oct 11 2021

CAZ060-112230-
/O.CON.KSGX.HW.W.0008.211011T1800Z-211012T1000Z/
/O.CON.KSGX.FR.Y.0003.211012T0700Z-211012T1600Z/
Apple and Lucerne Valleys-
Including the cities of Victorville, Hesperia, and Apple Valley
727 AM PDT Mon Oct 11 2021

...HIGH WIND WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
3 AM PDT TUESDAY...
...FROST ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 9 AM
PDT TUESDAY...

* WHAT...For the High Wind Warning, west winds 25 to 35 mph with 
  gusts to 55 mph expected. For the Frost Advisory, temperatures 
  as low as 30 in low-lying areas will result in frost formation.

* WHERE...Apple and Lucerne Valleys.

* WHEN...For the High Wind Warning, from 11 AM this morning to 3 
  AM PDT Tuesday. For the Frost Advisory, from midnight tonight 
  to 9 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. Frost could kill 
  sensitive outdoor vegetation if left unprotected.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use caution if you must drive.

Take steps now to protect tender plants from the cold.

&&

$$

CAZ055-056-058-112230-
/O.CON.KSGX.HW.W.0008.211011T1800Z-211012T1000Z/
San Bernardino County Mountains-Riverside County Mountains-
San Diego County Mountains-
Including the cities of Crestline, Lake Arrowhead, Big Bear City,
Big Bear Lake, Running Springs, Wrightwood, Idyllwild-Pine Cove, 
Julian, and Pine Valley
727 AM PDT Mon Oct 11 2021

...HIGH WIND WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
3 AM PDT TUESDAY...

* WHAT...West to northwest winds 30 to 40 mph with gusts 65 to 75
  mph expected.

* WHERE...San Bernardino County Mountains, Riverside County 
  Mountains and San Diego County Mountains. 

* WHEN...From 11 AM this morning to 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.

* ADDITIONAL DETAILS...Strongest wind gusts will occur on the 
  desert slopes of the San Diego and Riverside County Mountains. 
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use caution if you must drive.

&&

$$

CAZ043-057-552-554-112230-
/O.CON.KSGX.WI.Y.0034.211011T2000Z-211012T1000Z/
San Diego County Coastal Areas-Santa Ana Mountains and Foothills-
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
727 AM PDT Mon Oct 11 2021

...WIND ADVISORY REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO
3 AM PDT TUESDAY...

* WHAT...West to northwest winds 15 to 25 mph with gusts to 35 
  mph. Local gusts 40 to 45 mph possible along the immediate coast
  this evening.

* WHERE...San Diego County Deserts, Orange County Coastal Areas,
  San Diego County Valleys, Santa Ana Mountains and Foothills,
  Orange County Inland Areas, and San Diego County Coastal Areas.

* WHEN...From 1 PM this afternoon to 3 AM PDT Tuesday. Strongest
  after dark. 

* 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.

&&

$$

CAZ048-112230-
/O.CON.KSGX.WI.Y.0034.211011T2000Z-211012T1000Z/
San Bernardino and Riverside County Valleys-The Inland Empire-
Including the cities of Riverside, San Bernardino, Ontario, 
Moreno Valley, Fontana, Rancho Cucamonga, and Corona
727 AM PDT Mon Oct 11 2021

...WIND ADVISORY REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO
3 AM PDT TUESDAY...

* WHAT...West winds becoming north to northwest by late afternoon 15
  to 25 mph with gusts to 35 mph expected.

* WHERE...San Bernardino and Riverside County Valleys-The Inland 
  Empire.

* WHEN...From 1 PM this afternoon to 3 AM PDT Tuesday.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

* ADDITIONAL DETAILS...Strongest northerly winds below the Cajon
  Pass and along the foothills this evening.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$

CAZ050-112230-
/O.CON.KSGX.WI.Y.0034.211011T2000Z-211012T1000Z/
San Diego County Valleys-
Including the cities of Escondido, El Cajon, San Marcos, La Mesa,
Santee, and Poway
727 AM PDT Mon Oct 11 2021

...WIND ADVISORY REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO
3 AM PDT TUESDAY...

* WHAT...Southwest to west winds 15 to 25 mph with local gusts to
  35 mph.

* WHERE...San Diego County Valleys 

* WHEN...From 1 PM this afternoon to 3 AM PDT Tuesday.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

* ADDITIONAL DETAILS...Strongest winds late this afternoon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$

CAZ061-062-065-112230-
/O.CON.KSGX.WI.Y.0034.211011T2000Z-211012T1000Z/
Coachella Valley-San Diego County Deserts-
San Gorgonio Pass Near Banning-
Including the cities of Indio, Palm Springs, Cathedral City, 
Palm Desert, Palm Desert Country, La Quinta, Coachella, 
Borrego Springs, Banning, and Desert Hot Springs
727 AM PDT Mon Oct 11 2021

...WIND ADVISORY REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO
3 AM PDT TUESDAY...

* WHAT...West to northwest winds 25 to 35 mph with gusts to 50 to
  locally 60 mph expected.

* WHERE...San Diego County Deserts, Coachella Valley, San Gorgonio
  Pass Near Banning

* WHEN...From 1 PM this afternoon to 3 AM PDT Tuesday.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

* ADDITIONAL DETAILS...Strongest winds late afternoon and early
  evening.

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
132 
WWUS76 KSGX 111820
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service SAN DIEGO CA
1120 AM PDT Mon Oct 11 2021

CAZ060-120500-
/O.CAN.KSGX.FR.Y.0003.211012T0700Z-211012T1600Z/
/O.CON.KSGX.HW.W.0008.000000T0000Z-211012T1000Z/
Apple and Lucerne Valleys-
Including the cities of Victorville, Hesperia, and Apple Valley
1120 AM PDT Mon Oct 11 2021

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 3 AM PDT TUESDAY...

* WHAT...West winds 25 to 35 mph with gusts to 55 mph expected. 

* WHERE...Apple and Lucerne Valleys.

* 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. 

* ADDITIONAL DETAILS...Even though winds will decrease later
  tonight, they are expected to remain strong enough to limit any
  frost threat so the Frost Advisory has been cancelled.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use caution if you must drive.

&&

$$

CAZ055-056-058-120500-
/O.CON.KSGX.HW.W.0008.000000T0000Z-211012T1000Z/
San Bernardino County Mountains-Riverside County Mountains-
San Diego County Mountains-
Including the cities of Crestline, Lake Arrowhead, Big Bear City,
Big Bear Lake, Running Springs, Wrightwood, Idyllwild-Pine Cove, 
Julian, and Pine Valley
1120 AM PDT Mon Oct 11 2021

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 3 AM PDT TUESDAY...

* WHAT...West to northwest winds 30 to 40 mph with gusts 65 to 
  75 mph expected.

* WHERE...San Bernardino County Mountains, Riverside County 
  Mountains and San Diego County Mountains.

* WHEN...From 11 AM this morning to 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.

* ADDITIONAL DETAILS...Strongest wind gusts will occur on the 
  desert slopes of the San Diego and Riverside County Mountains.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use caution if you must drive.

&&

$$

CAZ043-057-552-554-120500-
/O.CON.KSGX.WI.Y.0034.211011T2000Z-211012T1000Z/
San Diego County Coastal Areas-Santa Ana Mountains and Foothills-
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
1120 AM PDT Mon Oct 11 2021

...WIND ADVISORY REMAINS IN EFFECT UNTIL 3 AM PDT TUESDAY...

* WHAT...West to northwest winds 15 to 25 mph with gusts to 35 
  mph. Local gusts 40 to 45 mph possible along the immediate 
  coast this evening.

* WHERE...San Diego County Deserts, Orange County Coastal Areas, 
  San Diego County Valleys, Santa Ana Mountains and Foothills, 
  Orange County Inland Areas, and San Diego County Coastal Areas.

* WHEN...From 1 PM this afternoon to 3 AM PDT Tuesday. Strongest 
  after dark.

* 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.

&&

$$

CAZ048-120500-
/O.CON.KSGX.WI.Y.0034.211011T2000Z-211012T1000Z/
San Bernardino and Riverside County Valleys-The Inland Empire-
Including the cities of Riverside, San Bernardino, Ontario, 
Moreno Valley, Fontana, Rancho Cucamonga, and Corona
1120 AM PDT Mon Oct 11 2021

...WIND ADVISORY REMAINS IN EFFECT UNTIL 3 AM PDT TUESDAY...

* WHAT...West winds becoming north to northwest by late 
  afternoon 15 to 25 mph with local gusts to 35 mph expected.

* WHERE...San Bernardino and Riverside County Valleys-The Inland 
  Empire.

* WHEN...From 1 PM this afternoon to 3 AM PDT Tuesday.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

* ADDITIONAL DETAILS...Strongest northerly winds below the Cajon 
  Pass and along the foothills this evening.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$

CAZ050-120500-
/O.CON.KSGX.WI.Y.0034.211011T2000Z-211012T1000Z/
San Diego County Valleys-
Including the cities of Escondido, El Cajon, San Marcos, La Mesa,
Santee, and Poway
1120 AM PDT Mon Oct 11 2021

...WIND ADVISORY REMAINS IN EFFECT UNTIL 3 AM PDT TUESDAY...

* WHAT...Southwest to west winds 15 to 25 mph with local gusts 
  to 35 mph.

* WHERE...San Diego County Valleys.

* WHEN...From 1 PM this afternoon to 3 AM PDT Tuesday.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

* ADDITIONAL DETAILS...Strongest winds late this afternoon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$

CAZ061-062-065-120500-
/O.CON.KSGX.WI.Y.0034.211011T2000Z-211012T1000Z/
Coachella Valley-San Diego County Deserts-
San Gorgonio Pass Near Banning-
Including the cities of Indio, Palm Springs, Cathedral City, 
Palm Desert, Palm Desert Country, La Quinta, Coachella, 
Borrego Springs, Banning, and Desert Hot Springs
1120 AM PDT Mon Oct 11 2021

...WIND ADVISORY REMAINS IN EFFECT UNTIL 3 AM PDT TUESDAY...

* WHAT...West to northwest winds 25 to 35 mph with gusts 50 mph.
  Locally 60 mph near the I-8 in southern San Diego County.

* WHERE...San Diego County Deserts, Coachella Valley, San 
  Gorgonio Pass Near Banning.

* WHEN...From 1 PM this afternoon to 3 AM PDT Tuesday.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

* ADDITIONAL DETAILS...Strongest winds late afternoon and early
  evening. Blowing dust may limit visibility at times.

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

The office that day

Everything else NWS San Diego, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 11, 12:29 PM PDTBlowing Dust AdvisorySGXSan Bernardino10 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.