Alert archive / California / Frost Advisories in 2018

Frost Advisory 7, NWS San Diego, CA

November 9, 2018San Bernardino County, California

NWS San Diego, CA issued this frost advisory at Nov 9, 2018, 2:00 AM PST for San Bernardino County, California. It took effect at Nov 10, 2018, 12:00 AM PST. It was in force for 32 hr.

The area

The counties it named.

The facts

Issued
Nov 9, 2018, 2:00 AM PST (10:00 UTC)
In effect from
Nov 10, 2018, 12:00 AM PST
Expired
Nov 11, 2018, 8:00 AM PST
In force
32 hr
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 10:03 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

Las Vegas, NV (KVEF), launched 00:00Z, 10.0 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 2018-11-09Temperature 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 00:00Z on 2018-11-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 square meters per square second.1939587897Sfc1 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
3452 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
-14 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

929 
WWUS76 KSGX 091000
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
200 AM PST Fri Nov 9 2018

...STRONG SANTA ANA WINDS TODAY...
...FROST ADVISORY FOR THE HIGH DESERTS...

.Strong and gusty Santa Ana winds will continue in the mountains,
foothills and some valleys today...diminishing this evening.

.Light winds, clear skies, and very dry air will allow overnight 
lows to fall to around 30 degrees in the high desert areas 
tonight and again Saturday night.


CAZ048-055-057-554-092200-
/O.CON.KSGX.HW.W.0008.000000T0000Z-181110T0200Z/
San Bernardino and Riverside County Valleys-The Inland Empire-
San Bernardino County Mountains-Santa Ana Mountains and Foothills-
Orange County Inland Areas-
Including the cities of Riverside, San Bernardino, Ontario, 
Moreno Valley, Fontana, Rancho Cucamonga, Corona, Crestline, 
Lake Arrowhead, Big Bear Lake, Running Springs, Santa Ana, 
Anaheim, Garden Grove, Orange, Fullerton, and Mission Viejo
200 AM PST Fri Nov 9 2018

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 6 PM PST THIS
EVENING...

* Winds...Northeast winds 20 to 30 mph with gusts up to 55 mph 
  below the Cajon Pass and into Orange County. Isolated gusts to 
  65 mph are possible in the Santa Ana Mountains. 

* Visibility...Areas of blowing dust will reduce visibility at 
  times, mainly below the Cajon Pass and near the foothills of 
  the Santa Ana Mountains. 

* Impacts...Hazardous driving conditions. Strong cross winds. 
  Downed trees and power lines. 

* Outlook...Another moderately strong Santa Ana event Sunday 
  afternoon through Monday. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Wind Warning means a hazardous high wind event is expected
or occurring.  Sustained wind speeds of at least 40 mph or gusts
of 58 mph or more can lead to property damage.

&&

$$

CAZ050-056-058-065-092200-
/O.CON.KSGX.HW.W.0008.000000T0000Z-181110T0200Z/
San Diego County Valleys-Riverside County Mountains-
San Diego County Mountains-San Gorgonio Pass Near Banning-
Including the cities of Escondido, Poway, Idyllwild-Pine Cove, 
Julian, Pine Valley, and Banning
200 AM PST Fri Nov 9 2018

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 6 PM PST THIS
EVENING...

* Winds...Areas of north to northeast winds 20 to 35 mph with 
  gusts to 50 mph through Friday, with the strongest and most 
  widespread winds this morning. Isolated gusts near 60 mph are 
  possible below passes and wind-prone canyons.
 
* Impacts...Hazardous driving conditions. Strong cross winds. 
  Downed trees and power lines. 

* Outlook...Another moderately strong Santa Ana event Sunday 
  afternoon through Monday. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Wind Warning means a hazardous high wind event is expected
or occurring.  Sustained wind speeds of at least 40 mph or gusts
of 58 mph or more can lead to property damage.

&&

$$

CAZ060-092200-
/O.NEW.KSGX.FR.Y.0007.181110T0800Z-181111T1600Z/
Apple and Lucerne Valleys-
Including the cities of Victorville, Hesperia, and Apple Valley
200 AM PST Fri Nov 9 2018

...FROST ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM PST
SUNDAY...

The National Weather Service in San Diego has issued a Frost
Advisory...which is in effect from midnight tonight to 8 AM PST
Sunday. 

* Location...High deserts of San Bernardino County.

* Duration...Midnight to 8 AM PST Today through Sunday morning 

* Temperature...28 to 33 degrees.

* Impacts...Sensitive plants and crops may be damaged or killed

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Frost Advisory means that widespread temperatures near freezing
are expected. Sensitive outdoor plants may be killed if left 
uncovered.

&&

$$

10
7 follow-up statements
430 
WWUS76 KSGX 092101
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
101 PM PST Fri Nov 9 2018

...STRONG SANTA ANA WINDS THIS AFTERNOON... 
...FROST ADVISORY FOR THE HIGH DESERTS...

.Strong and gusty Santa Ana winds will continue in the mountains,
foothills and some valleys through this afternoon. The winds will
diminish this evening. 

.Light winds, clear skies, and very dry air will allow overnight
lows to fall to the upper 20s to mid 30s across the high desert 
areas tonight and again Saturday night.

CAZ048-055-057-554-100200-
/O.CON.KSGX.HW.W.0008.000000T0000Z-181110T0200Z/
San Bernardino and Riverside County Valleys-The Inland Empire-
San Bernardino County Mountains-Santa Ana Mountains and Foothills-
Orange County Inland Areas-
Including the cities of Riverside, San Bernardino, Ontario, 
Moreno Valley, Fontana, Rancho Cucamonga, Corona, Crestline, 
Lake Arrowhead, Big Bear Lake, Running Springs, Santa Ana, 
Anaheim, Garden Grove, Orange, Fullerton, and Mission Viejo
101 PM PST Fri Nov 9 2018

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 6 PM PST THIS
EVENING...

* Winds...Northeast winds 20 to 30 mph with gusts up to 50 mph
  below the Cajon Pass and into Orange County.

* Visibility...Areas of blowing dust will reduce visibility at 
  times, mainly below the Cajon Pass and near the foothills of 
  the Santa Ana Mountains. 

* Impacts...Hazardous driving conditions. Strong cross winds. 
  Downed trees and power lines. 

* Outlook...Another moderately strong Santa Ana event is expected
  Sunday afternoon through Tuesday morning. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Wind Warning means a hazardous high wind event is expected
or occurring.  Sustained wind speeds of at least 40 mph or gusts
of 58 mph or more can lead to property damage.

&&

$$

CAZ050-056-058-065-100200-
/O.CON.KSGX.HW.W.0008.000000T0000Z-181110T0200Z/
San Diego County Valleys-Riverside County Mountains-
San Diego County Mountains-San Gorgonio Pass Near Banning-
Including the cities of Escondido, Poway, Idyllwild-Pine Cove, 
Julian, Pine Valley, and Banning
101 PM PST Fri Nov 9 2018

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 6 PM PST THIS
EVENING...

* Winds...Areas of north to northeast winds 20 to 30 mph with
  gusts to 50 mph this afternoon. Winds will diminish this 
  evening. 

* Impacts...Hazardous driving conditions. Strong cross winds. 
  Downed trees and power lines. 

* Outlook...Another moderately strong Santa Ana event is expected
  Sunday afternoon through Tuesday morning. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Wind Warning means a hazardous high wind event is expected
or occurring.  Sustained wind speeds of at least 40 mph or gusts
of 58 mph or more can lead to property damage.

&&

$$

CAZ060-100515-
/O.CON.KSGX.FR.Y.0007.181110T0800Z-181111T1600Z/
Apple and Lucerne Valleys-
Including the cities of Victorville, Hesperia, and Apple Valley
101 PM PST Fri Nov 9 2018

...FROST ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO 8 AM
PST SUNDAY...

* Location...High deserts of San Bernardino County.

* Duration...Tonight and early Saturday morning and again Saturday
  night and early Sunday morning. 

* Temperature...28 to 35 degrees.

* Impacts...Sensitive plants and crops may be damaged or killed. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Frost Advisory means that widespread temperatures near freezing
are expected. Sensitive outdoor plants may be killed if left
uncovered.

&&

$$

Moreland/Moede
621 
WWUS76 KSGX 100547
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
947 PM PST Fri Nov 9 2018

CAZ060-101400-
/O.CON.KSGX.FR.Y.0007.181110T0800Z-181111T1600Z/
Apple and Lucerne Valleys-
Including the cities of Victorville, Hesperia, and Apple Valley
947 PM PST Fri Nov 9 2018

...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST SUNDAY...

* Location...High Desert and Victor Valley in San Bernardino 
  County.

* Duration...Tonight and early Saturday morning and again 
  Saturday night and early Sunday morning. 

* Temperature...24 to 34 degrees.

* Impacts...Sensitive plants and crops may be damaged or killed.  
  Provide shelter or bring in pets and sensitive animals.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Frost Advisory means that widespread temperatures near freezing
are expected. Sensitive outdoor plants may be killed if left
uncovered.

&&

$$

jmb

weather.gov
176 
WWUS76 KSGX 101308
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
508 AM PST Sat Nov 10 2018

CAZ060-101600-
/O.CON.KSGX.FR.Y.0007.000000T0000Z-181111T1600Z/
Apple and Lucerne Valleys-
Including the cities of Victorville, Hesperia, and Apple Valley
508 AM PST Sat Nov 10 2018

...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST SUNDAY...

* Location...High Desert of San Bernardino County.

* Duration...early this morning and again Saturday night and 
  early Sunday morning. 

* Temperature...24 to 34 degrees.

* Impacts...Sensitive plants and crops may be damaged or killed. 
  Provide shelter or bring in pets and sensitive animals. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Frost Advisory means that widespread temperatures near freezing
are expected. Sensitive outdoor plants may be killed if left
unprotected.

&&

$$
10
080 
WWUS76 KSGX 102258
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
258 PM PST Sat Nov 10 2018

CAZ048-055>057-065-554-110700-
/O.NEW.KSGX.HW.W.0009.181111T1400Z-181114T0100Z/
San Bernardino and Riverside County Valleys-The Inland Empire-
San Bernardino County Mountains-Riverside County Mountains-
Santa Ana Mountains and Foothills-San Gorgonio Pass Near Banning-
Orange County Inland Areas-
Including the cities of San Bernardino, Fontana, 
Rancho Cucamonga, Crestline, Running Springs, 
Idyllwild-Pine Cove, Banning, and Desert Hot Springs
258 PM PST Sat Nov 10 2018

...HIGH WIND WARNING IN EFFECT FROM 6 AM SUNDAY TO 5 PM PST
TUESDAY...

The National Weather Service in San Diego has issued a High Wind
Warning...which is in effect from 6 AM Sunday to 5 PM PST
Tuesday. 

* Winds...Northeast winds 20 to 40 mph with gusts to 60 mph.
  Isolated gusts to 70 mph at the most wind prone locations such
  as Freemont Canyon in the Santa Ana Mountains and northern
  sections of the Inland Empire along and north of Highway 210.

* Timing...Sunday morning through early Tuesday evening.

* Location...Coastal mountain slopes, foothills, and valleys.
  Strongest winds between Rancho Cucamonga and San Bernardino in
  the Inland Empire, between Tustin and Rancho Santa Margarita in
  Orange County, and in and around the San Gorgonio Pass including
  the cities of Cabazon, Beaumont, and San Jacinto.

* Impacts...Hazardous driving conditions. Strong cross winds.
  Downed trees and power lines.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Wind Warning means a hazardous high wind event is expected
or occurring.  Sustained wind speeds of at least 40 mph or gusts
of 58 mph or more can lead to property damage.

&&

$$

CAZ050-058-110700-
/O.NEW.KSGX.HW.W.0009.181112T0800Z-181114T0100Z/
San Diego County Valleys-San Diego County Mountains-
Including the cities of Julian and Pine Valley
258 PM PST Sat Nov 10 2018

...HIGH WIND WARNING IN EFFECT FROM MIDNIGHT SUNDAY NIGHT TO 5 PM
PST TUESDAY...

The National Weather Service in San Diego has issued a High Wind
Warning...which is in effect from midnight Sunday night to 5 PM
PST Tuesday. 

* Winds...East winds 20 to 40 mph with gusts to 60 mph. Localized
  gusts to 70 mph in the most wind prone locations of the 
  backcountry such as Sill Hill.

* Timing...Late Sunday night through early Tuesday evening.

* Location...Coastal mountain slopes, the foothills, and into the
  eastern inland valleys, including Valley Center, Ramona, Alpine,
  Pine Valley, and surround areas.

* Impacts...Hazardous driving conditions. Strong cross winds. 
  Downed trees and power lines.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Wind Warning means a hazardous high wind event is expected
or occurring.  Sustained wind speeds of at least 40 mph or gusts
of 58 mph or more can lead to property damage.

&&

$$

CAZ060-110700-
/O.CON.KSGX.FR.Y.0007.000000T0000Z-181111T1600Z/
Apple and Lucerne Valleys-
Including the cities of Victorville, Hesperia, and Apple Valley
258 PM PST Sat Nov 10 2018

...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST SUNDAY...

* Location...High Desert of San Bernardino County.

* Duration...Late tonight through early Sunday morning. 

* Temperature...28 to 34 degrees.

* Impacts...Sensitive plants and crops may be damaged or killed. 
  Provide shelter or bring in pets and sensitive animals. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Frost Advisory means that widespread temperatures near freezing
are expected. Sensitive outdoor plants may be killed if left
unprotected.

&&

$$
Gregoria
319 
WWUS76 KSGX 110413
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
813 PM PST Sat Nov 10 2018

CAZ048-055>057-065-554-111400-
/O.CON.KSGX.HW.W.0009.181111T1400Z-181114T0100Z/
San Bernardino and Riverside County Valleys-The Inland Empire-
San Bernardino County Mountains-Riverside County Mountains-
Santa Ana Mountains and Foothills-San Gorgonio Pass Near Banning-
Orange County Inland Areas-
Including the cities of San Bernardino, Fontana, 
Rancho Cucamonga, Crestline, Running Springs, 
Idyllwild-Pine Cove, Banning, and Desert Hot Springs
813 PM PST Sat Nov 10 2018

...HIGH WIND WARNING REMAINS IN EFFECT FROM 6 AM SUNDAY TO 5 PM
PST TUESDAY...

* Winds...Northeast winds 20 to 40 mph with gusts to 60 mph. 
  Isolated gusts to 70 mph at the most wind prone locations such 
  as Freemont Canyon in the Santa Ana Mountains and northern 
  sections of the Inland Empire along and north of Highway 210. 

* Timing...Sunday morning through Tuesday afternoon.

* Location...Coastal mountain slopes, foothills, and valleys. 
  Strongest winds between Rancho Cucamonga and San Bernardino in 
  the Inland Empire, between Tustin and Rancho Santa Margarita 
  in Orange County, and in and around the San Gorgonio Pass 
  including the cities of Cabazon, Beaumont, and San Jacinto. 

* Impacts...Hazardous driving conditions. Strong cross winds. 
  Downed trees and power lines. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Wind Warning means a hazardous high wind event is expected
or occurring.  Sustained wind speeds of at least 40 mph or gusts
of 58 mph or more can lead to property damage.

&&

$$

CAZ050-058-111400-
/O.CON.KSGX.HW.W.0009.181112T0800Z-181114T0100Z/
San Diego County Valleys-San Diego County Mountains-
Including the cities of Julian and Pine Valley
813 PM PST Sat Nov 10 2018

...HIGH WIND WARNING REMAINS IN EFFECT FROM MIDNIGHT SUNDAY NIGHT
TO 5 PM PST TUESDAY...

* Winds...East winds 20 to 40 mph with gusts to 60 mph. Isolated 
  gusts to 70 mph in the most wind prone locations of the 
  backcountry such as Sill Hill. 

* Timing...Late Sunday night through Tuesday afternoon.

* Location...Coastal mountain slopes, the foothills, and into 
  the eastern inland valleys, including Valley Center, Ramona, 
  Alpine, Pine Valley, and surround areas. 

* Impacts...Hazardous driving conditions. Strong cross winds. 
  Downed trees and power lines. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Wind Warning means a hazardous high wind event is expected
or occurring.  Sustained wind speeds of at least 40 mph or gusts
of 58 mph or more can lead to property damage.

&&

$$

CAZ060-111400-
/O.CON.KSGX.FR.Y.0007.000000T0000Z-181111T1600Z/
Apple and Lucerne Valleys-
Including the cities of Victorville, Hesperia, and Apple Valley
813 PM PST Sat Nov 10 2018

...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST SUNDAY...

* Location...High Desert of San Bernardino County.

* Duration...Late tonight through early Sunday morning.

* Temperature...28 to 34 degrees.

* Impacts...Sensitive plants and crops may be damaged or killed. 
  Provide shelter or bring in pets and sensitive animals. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Frost Advisory means that widespread temperatures near freezing
are expected. Sensitive outdoor plants may be killed if left
unprotected.

&&

$$

jmb

weather.gov
888 
WWUS76 KSGX 111158
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
358 AM PST Sun Nov 11 2018

CAZ048-055>057-065-554-112000-
/O.CON.KSGX.HW.W.0009.181111T1400Z-181114T0100Z/
San Bernardino and Riverside County Valleys-The Inland Empire-
San Bernardino County Mountains-Riverside County Mountains-
Santa Ana Mountains and Foothills-San Gorgonio Pass Near Banning-
Orange County Inland Areas-
Including the cities of San Bernardino, Fontana, 
Rancho Cucamonga, Crestline, Running Springs, 
Idyllwild-Pine Cove, Banning, and Desert Hot Springs
358 AM PST Sun Nov 11 2018

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 5 PM PST TUESDAY...

* Winds...Northeast 20 to 30 mph with isolated gusts 50 to 60 
  mph. Isolated gusts to 70 mph at the most wind prone locations 
  such as Freemont Canyon in the Santa Ana Mountains and northern 
  sections of the Inland Empire along and north of Highway 210. 

* Timing...Sunday morning through Tuesday afternoon.

* Location...Coastal mountain slopes, foothills, and valleys. 
  Strongest winds between Rancho Cucamonga and San Bernardino in 
  the Inland Empire, between Tustin and Rancho Santa Margarita 
  in Orange County, and in and around the San Gorgonio Pass 
  including the cities of Cabazon, Beaumont, and San Jacinto. 

* Impacts...Hazardous driving conditions. Strong cross winds. 
  Downed trees and power lines. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Wind Warning means a hazardous high wind event is expected
or occurring.  Sustained wind speeds of at least 40 mph or gusts
of 58 mph or more can lead to property damage.

&&

$$

CAZ050-058-112000-
/O.CON.KSGX.HW.W.0009.181112T0800Z-181114T0100Z/
San Diego County Valleys-San Diego County Mountains-
Including the cities of Julian and Pine Valley
358 AM PST Sun Nov 11 2018

...HIGH WIND WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO
5 PM PST TUESDAY...

* Winds...East to northeast 20 to 30 mph with gusts to 45 mph 
  this afternoon through Monday morning...Isolated gusts to 60 mph
  possible in the most wind prone locations of the back country 
  such as Sill Hill. East winds increasing 30 to 40 MPH with peak 
  gusts 55 to 70 MPH Monday night into Tuesday morning.

* Timing...This evening through Tuesday afternoon.

* Location...Coastal mountain slopes, the foothills, and into the
  eastern inland valleys.

* Impacts...Hazardous driving conditions. Strong cross winds. 
  Downed trees and power lines. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Wind Warning means a hazardous high wind event is expected
or occurring.  Sustained wind speeds of at least 40 mph or gusts
of 58 mph or more can lead to property damage.

&&

$$

CAZ060-111600-
/O.CON.KSGX.FR.Y.0007.000000T0000Z-181111T1600Z/
Apple and Lucerne Valleys-
Including the cities of Victorville, Hesperia, and Apple Valley
358 AM PST Sun Nov 11 2018

...FROST ADVISORY REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING...

* Location...High Desert of San Bernardino County.

* Temperature...28 to 34 degrees.

* Impacts...Sensitive plants and crops may be damaged or killed. 
  Provide shelter or bring in pets and sensitive animals. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Frost Advisory means that widespread temperatures near freezing
are expected. Sensitive outdoor plants may be killed if left
unprotected.

&&

$$

10
102 
WWUS76 KSGX 111559
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
759 AM PST Sun Nov 11 2018

CAZ060-111700-
/O.EXP.KSGX.FR.Y.0007.000000T0000Z-181111T1600Z/
Apple and Lucerne Valleys-
Including the cities of Victorville, Hesperia, and Apple Valley
759 AM PST Sun Nov 11 2018

...FROST ADVISORY WILL EXPIRE AT 8 AM PST THIS MORNING...


$$

CAZ048-055>057-065-554-120000-
/O.CON.KSGX.HW.W.0009.000000T0000Z-181114T0100Z/
San Bernardino and Riverside County Valleys-The Inland Empire-
San Bernardino County Mountains-Riverside County Mountains-
Santa Ana Mountains and Foothills-San Gorgonio Pass Near Banning-
Orange County Inland Areas-
Including the cities of San Bernardino, Fontana, 
Rancho Cucamonga, Crestline, Running Springs, 
Idyllwild-Pine Cove, Banning, and Desert Hot Springs
759 AM PST Sun Nov 11 2018

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 5 PM PST TUESDAY...

* Winds...Northeast 20 to 30 mph with isolated gusts 50 to 60 
  mph. Isolated gusts to 70 mph at the most wind prone locations 
  such as Freemont Canyon in the Santa Ana Mountains and 
  northern sections of the Inland Empire along and north of 
  Highway 210. 

* Timing...Sunday morning through Tuesday afternoon.

* Location...Coastal mountain slopes, foothills, and valleys. 
  Strongest winds between Rancho Cucamonga and San Bernardino in 
  the Inland Empire, between Tustin and Rancho Santa Margarita 
  in Orange County, and in and around the San Gorgonio Pass 
  including the cities of Cabazon, Beaumont, and San Jacinto. 

* Impacts...Hazardous driving conditions. Strong cross winds. 
  Downed trees and power lines. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Wind Warning means a hazardous high wind event is expected
or occurring.  Sustained wind speeds of at least 40 mph or gusts
of 58 mph or more can lead to property damage.

&&

$$

CAZ050-058-120000-
/O.CON.KSGX.HW.W.0009.181112T0800Z-181114T0100Z/
San Diego County Valleys-San Diego County Mountains-
Including the cities of Julian and Pine Valley
759 AM PST Sun Nov 11 2018

...HIGH WIND WARNING REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO
5 PM PST TUESDAY...

* Winds...East to northeast 20 to 30 mph with gusts to 45 mph 
  this afternoon through Monday morning...Isolated gusts to 60 
  mph possible in the most wind prone locations of the back 
  country such as Sill Hill. East winds increasing 30 to 40 MPH 
  with peak gusts 55 to 70 MPH Monday night into Tuesday 
  morning. 

* Timing...This evening through Tuesday afternoon.

* Location...Coastal mountain slopes, the foothills, and into 
  the eastern inland valleys. 

* Impacts...Hazardous driving conditions. Strong cross winds. 
  Downed trees and power lines. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Wind Warning means a hazardous high wind event is expected
or occurring.  Sustained wind speeds of at least 40 mph or gusts
of 58 mph or more can lead to property damage.

&&

$$
Gregoria

What forecasters said that day

The local office's own words before this frost advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS San Diego, CA wrote its last area forecast discussion before this frost advisory went out at Nov 8, 9:10 PM PST, 4 hours 50 minutes earlier.

Area forecast discussion, Nov 8, 9:10 PM PST, 4 hours 50 minutes before
Area Forecast Discussion
National Weather Service San Diego CA
910 PM PST Thu Nov 8 2018

.SYNOPSIS...
A Santa Ana weather pattern will be in place through most of next
week with dry weather and periods of offshore winds. Strong Santa
Ana winds will impact the mountains, foothills and valleys tonight
through Friday morning before subsiding. There will be a second
round of strong winds Sunday and Monday. Temperatures will be a
little warmer than average in the coastal and valley areas through
the period, and a little below average in the mountains and deserts.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

No updates were necessary this evening. Santa Ana winds remain gusty
especially over portions of the Inland Empire and Orange County
where gusts up to 45 mph have been reported along with blowing dust
affecting the Chino and Ontario areas earlier this evening.
Strongest wind gust was 65 mph at CSU San Bernardino mesonet station
at 1245 PM. We will update the peak wind report before 2200. Strong
Santa Ana winds will continue overnight into Friday morning and then
gradually subside Friday. Will then be looking to the next
potentially strong Santa Ana wind event slated for Sunday into
Monday, which will likely require additional wind and fire weather
headlines. The other noteworthy weather feature will be very chilly
air settling into the High Desert with low temperatures falling into
the lower 30s Friday night and likely continuing into early next
week each night in some areas of the High Desert. These conditions
may require frost/freeze headlines on subsequent shifts.

Remainder of previous forecaster discussion issued at 145 PM
Thursday afternoon:

A prolonged period of Santa Ana weather is in store for Southern
California that will persist through next week. The first batch of
strong northeast winds arrived this morning and will continue
through midday Friday before decreasing. One other effect of this
Santa Ana was the significant warming that occurred west of the
mountains. Corona was 82F at Noon, 14 degrees warmer than yesterday.
In contrast, the mountains were much colder. Lake Arrowhead was 61F,
13 degrees colder than yesterday. Dewpoints plummeted 20-30 degrees
in these areas, and were mostly in the single digits. RH's were in
the single digits.

There isn't much change in the forecast from this morning. Double
digit offshore pressure gradients from the Great Basin will get a
little stronger this evening with surface high pressure over
northern Nevada. North to northeast winds of 20 to 30 mph will gust
to 55 mph in the mountains, foothills and some inland valleys
through Friday morning. Gusts to 65 mph are possible in a few spots,
mainly the Santa Ana Mountains, below the Cajon Pass, and some of
the wind prone ridges in the San Diego County mountains. Winds will
subside late Friday and Friday night with much weaker and more
localized winds on Saturday into early Sunday.

A colder airmass has filtered into the mountain and desert areas.
The High Deserts will fall into the mid to upper 30s tonight, and
then into the low to mid 30s Friday night where there would be
patchy frost if there was enough moisture for frost to form. As it
stands, the first Frost Advisory of the season may be needed for the
High Deserts to emphasis the first cold nights of the season.

On Saturday the winds will be lighter and the temperatures a little
higher in most areas.

On Sunday, another "inside slider" low pressure trough digs
southeast across the Great Basin for round two of strong Santa Ana
winds Sunday afternoon through Monday. The pressure gradient field
will be more east-west for potentially stronger winds in the
Riverside and San Diego County mountains and foothills, but San
Bernardino and Orange County will also experience strong, dry Santa
Ana winds.

Tuesday through Thursday: Models continue the Santa Ana pattern of
upper ridging over the Southwest and a continuation of weak to
occasionally moderate strength offshore flow.

&&

.AVIATION...
090500Z...Coast/Valleys...Areas of surface northeast winds 15-30
knots with gusts 40-55 knots will continue especially below
passes/canyons and near the foothills with accompanied LLWS and
moderate-strong up/downdrafts. Local vis will be reduced to below 3
miles in blowing dust. Winds will gradually weaken Fri after 21Z.
Otherwise, skies will be clear with unrestricted vis through Fri.

Mountains/Deserts...Mostly clear with unrestricted visibility
through Fri. Areas of northeast surface winds 15-30 knots with gusts
35-50 knots will continue along the coastal mountain slopes through
Fri, but with some weakening after 21Z.

&&

.MARINE...
No hazardous marine weather expected through Tuesday except for
local northeast wind gusts just off the coast of Camp Pendleton
likely exceeding 20 KT through Friday.

&&

.FIRE WEATHER...
Critical fire weather conditions through Friday afternoon across San
Bernardino, Orange and Riverside counties with strong Santa Ana
winds and single digit humidities. Sustained winds through Noon were
20-30 mph in these areas with peak gusts of 51 mph at CSU San
Bernardino and Highland Springs. The Santa Ana winds had also moved
into the Riverside and San Diego County County Mountains and
foothills.

High resolution models and surface pressure gradient field support
strong winds continuing tonight through Friday morning with a few
gusts to 65 mph in windiest mountain and foothill areas. Lowest
humidity this afternoon will fall to 4 to 8 percent, and then from 3
to 8 percent on Friday. Red Flag Warnings are in effect through 10
PM Friday.

Very dry conditions but with lighter offshore winds will continue
into Saturday. This will be followed by another moderate-to-strong
Santa Ana Sunday and Monday and a critical period of fire weather
potential with low humidities and near record low fuel moisture. The
pressure pattern will be a little more favorable for stronger winds
in Riverside and San Diego County, but it will be also be very windy
in San Bernardino and Orange County too. Humidities will remain very
low, likely in the single digits. Critical fire weather conditions
continue, and Fire Weather Watches/Red Flag Warnings will be needed.

Weak to occasionally moderate strength Santa Ana winds will continue
Tuesday through Friday of next week.

&&

.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...High Wind Warning from midnight tonight to 6 PM PST Friday for
     Riverside County Mountains-San Diego County Mountains-San
     Diego County Valleys-San Gorgonio Pass Near Banning.

     Red Flag Warning until 10 PM PST Friday for Orange County
     Coastal Areas-Orange County Inland Areas-Riverside County
     Mountains-Including The San Jacinto Ranger District Of The
     San Bernardino National Forest-San Bernardino County
     Mountains-Including The Mountain Top And Front Country
     Ranger Districts Of The San Bernardino National Forest-San
     Bernardino and Riverside County Valleys  -The Inland Empire-
     San Diego County Inland Valleys-San Diego County Mountains-
     Including The Palomar And Descanso Ranger Districts of the
     Cleveland National Forest-Santa Ana Mountains-Including The
     Trabuco Ranger District of the Cleveland National Forest.

     High Wind Warning until 6 PM PST Friday for Orange County Inland
     Areas-San Bernardino County Mountains-San Bernardino and
     Riverside County Valleys-The Inland Empire-Santa Ana
     Mountains and Foothills.

PZ...NONE.

&&

PUBLIC/FIRE WEATHER...Moede/JMB
AVIATION/MARINE...Maxwell

In the hours before

Local storm report, Nov 8, 8:52 PM PST, 5 hours 8 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
852 PM PST THU NOV 8 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0725 PM     NON-TSTM WND GST 2 W IRVINE              33.68N 117.87W
11/08/2018  M43 MPH          ORANGE             CA   ASOS

            ASOS STATION SNA, JOHN WAYNE AIRPORT.

&&

JMB

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 9, 1:00 PM PSTFire Weather WatchSGXOrange, Riverside, San Bernardino, San Diego18 hr

Nearby

Frost Advisories in California, 2018Every frost advisory in 2018

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.