Alert archive / California / Red Flag Warnings in 2020

Red Flag Warning 8, NWS San Diego, CA

December 5, 20204 counties in California

NWS San Diego, CA issued this red flag warning at Dec 5, 2020, 12:59 PM PST for 4 counties in California. It took effect at Dec 7, 2020, 4:00 AM PST. It was in force for 42 hr. 36 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Dec 5, 2020, 12:59 PM PST (20:59 UTC)
In effect from
Dec 7, 2020, 4:00 AM PST
Expired
Dec 8, 2020, 10:00 PM PST
In force
42 hr
Issued by
NWS San Diego, CA

Counties Orange County, CA, Riverside County, CA, San Bernardino County, CA, San Diego County, CA

The radar

The Santa Ana Mts radar (KSOX), 88 km from the middle of the area, began a volume at 20:57 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.

What was reported inside it

TimeReportWhereRemark
Dec 7, 5:40 PM PSTNON-TSTM WND GST 565 E Rainbow, CAMESONET STATION RHSSD RANCHO HEIGHTS (SDGE).
Dec 7, 6:30 PM PSTNON-TSTM WND GST 817 E Valley Center, CAMESONET STATION HHCSD HELLHOLE CANYON (SDGE).
Dec 7, 6:30 PM PSTNON-TSTM WND GST 827 E Valley Center, CAMESONET STATION HHCSD HELLHOLE CANYON (SDGE).
Dec 7, 7:00 PM PSTNON-TSTM WND GST 572 N Alpine, CAMESONET STATION AVYSD ANDERSON VALLEY (SDGE).
Dec 7, 8:10 PM PSTNON-TSTM WND GST 592 Sw Idyllwild, CAMESONET STATION SE092 IDYLLWILD WEST RIDGE 1 (SCE092).
Dec 7, 8:20 PM PSTNON-TSTM WND GST 572 E Mountain Center, CAMESONET STATION SE375 KEEN RIDGE (SCE375).
Dec 7, 8:30 PM PSTNON-TSTM WND GST 557 Ene Alpine, CAMESONET STATION NDCSD NORTH DESCANSO (SDGE).
Dec 7, 8:30 PM PSTNON-TSTM WND GST 584 Wsw Santa Ysabel, CAMESONET STATION WCKSD WITCH CREEK (SDGE).
Dec 7, 8:40 PM PSTNON-TSTM WND GST 554 E Yucaipa, CAMESONET STATION SE085 PIGSAH PEAK (SCE085).
Dec 7, 8:50 PM PSTNON-TSTM WND GST 555 Ene Alpine, CAMESONET STATION VGDSD VIEJAS GRADE (SDGE).
Dec 7, 9:10 PM PSTNON-TSTM WND GST 583 Sw Santa Ysabel, CAMESONET STATION DYESD DYE MOUNTAIN (SDGE).
Dec 7, 10:03 PM PSTNON-TSTM WND GST 6513 Sw La Quinta, CAMESONET STATION HP003 TORO PEAK (HPWREN).
Dec 7, 10:03 PM PSTNON-TSTM WND GST 6913 Sw La Quinta, CAMESONET STATION HP003 TORO PEAK (HPWREN).
Dec 7, 10:05 PM PSTNON-TSTM WND GST 683 Wnw Palomar Mountain, CAMESONET STATION HP014 BOUCHER HILL (HPWREN).
Dec 7, 10:05 PM PSTNON-TSTM WND GST 703 Wnw Palomar Mountain, CAMESONET STATION HP014 BOUCHER HILL (HPWREN).
Dec 7, 10:14 PM PSTNON-TSTM WND GST 575 S Banning, CAMESONET STATION POPC1 POPPET FLATS RAWS.
Dec 7, 10:15 PM PSTNON-TSTM WND GST 653 S Crestline, CAMESONET STATION HF008 MARSHALL PEAK (SDHGPA).
Dec 7, 10:17 PM PSTNON-TSTM WND GST 571 Ne Mountain Center, CAMESONET STATION KNWC1 SAN MARCOS 3.
Dec 7, 10:20 PM PSTNON-TSTM WND GST 553 S Palomar Mountain, CAMESONET STATION POMSD POOMACHA (SDGE).
Dec 7, 10:20 PM PSTNON-TSTM WND GST 623 Ssw Banning, CAMESONET STATION SE700 BANNING (SCE700).
Dec 7, 11:00 PM PSTNON-TSTM WND GST 622 N Santa Ysabel, CAMESONET STATION SYRSD SANTA YSABEL RANCH (SDGE).
Dec 7, 11:13 PM PSTNON-TSTM WND GST 614 Nnw Banning, CAMESONET STATION BNJC1 BANNING RAWS.
Dec 8, 12:00 AM PSTNON-TSTM WND GST 601 Nnw Idyllwild, CAMESONET STATION FW6883 PINE COVE ROCKY POINT.
Dec 8, 12:30 AM PSTNON-TSTM WND GST 623 S Crestline, CAMESONET STATION HF008 MARSHALL PEAK (SDHGPA).
Dec 8, 1:30 AM PSTNON-TSTM WND GST 573 Ssw Banning, CAMESONET STATION SE700 BANNING (SCE700).
Dec 8, 2:13 AM PSTNON-TSTM WND GST 564 Nnw Banning, CAMESONET STATION BNJC1 BANNING RAWS.
Dec 8, 2:14 AM PSTNON-TSTM WND GST 615 Wsw Dulzura, CAMESONET STATION OTYC1 OTAY MOUNTAIN RAWS.
Dec 8, 3:30 AM PSTNON-TSTM WND GST 577 Nw Mt Laguna, CAMESONET STATION HF002 LAGUNA LAUNCH (SDHGPA).
Dec 8, 4:00 AM PSTNON-TSTM WND DMG7 S Julian, CA4 INCH DIAMETER TREE LIMB DOWN OFF OF A HEALTHY CEDAR TREE. TIME ESTIMATED.
Dec 8, 4:43 AM PSTNON-TSTM WND GST 566 N Dulzura, CAMESONET STATION HP002 LYONS PEAK (HPWREN).
Dec 8, 5:55 AM PSTNON-TSTM WND GST 659 Wnw Santa Ysabel, CAMESONET STATION HP016 BIG BLACK MOUNTAIN (HPWREN).
Dec 8, 8:15 AM PSTNON-TSTM WND GST 655 Wnw Palomar Mountain, CAMESONET STATION HF001 PALOMAR MTN LAUNCH (SDHGPA).
Dec 8, 8:20 AM PSTNON-TSTM WND GST 719 Ssw Julian, CAMESONET STATION SILSD SILL HILL (SDGE).
Dec 8, 8:55 AM PSTNON-TSTM WND GST 779 Wnw Santa Ysabel, CAMESONET STATION HP016 BIG BLACK MOUNTAIN (HPWREN).
Dec 8, 8:55 AM PSTNON-TSTM WND GST 809 Wnw Santa Ysabel, CAMESONET STATION HP016 BIG BLACK MOUNTAIN (HPWREN).
Dec 8, 10:51 AM PSTNON-TSTM WND GST 658 Ene Orange, CAMESONET STATION FRCC1 FREMONT CANYON.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

San Diego, CA (KNKX), launched 12:00Z, 9.0 hours before the alert went out and 124 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, San Diego, CA at 12:00Z on 2020-12-05Temperature 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, San Diego, CA at 12:00Z on 2020-12-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 square meters per square second.1939Sfc1 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
4772 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
23 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

929 
WWUS86 KSGX 052059
RFWSGX

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Diego CA
1259 PM PST Sat Dec 5 2020

CAZ262-052200-
/O.CAN.KSGX.FW.A.0008.201207T1200Z-201209T0400Z/
San Diego County Deserts-
Including The Anza Borrego Desert State Park-
1259 PM PST Sat Dec 5 2020

...FIRE WEATHER WATCH IS CANCELLED FOR STRONG GUSTY WINDS AND LOW
HUMIDITY FOR MOUNTAINS...VALLEYS...INLAND ORANGE COUNTY AND THE
SAN GORGONIO PASS......

The National Weather Service in San Diego has cancelled the Fire
Weather Watch. 

$$

CAZ248-250-255>258-265-554-060600-
/O.UPG.KSGX.FW.A.0008.201207T1200Z-201209T0400Z/
/O.NEW.KSGX.FW.W.0008.201207T1200Z-201209T0600Z/
San Bernardino and Riverside County Valleys - The Inland Empire-
San Diego County Inland Valleys-San Bernardino County Mountains-
Including The Mountain Top And Front Country Ranger Districts Of
The San Bernardino National Forest-Riverside County Mountains-
Including The San Jacinto Ranger District Of The San Bernardino
National Forest-Santa Ana Mountains-
Including The Trabuco Ranger District of the Cleveland National
Forest-San Diego County Mountains-
Including The Palomar And Descanso Ranger Districts of the
Cleveland National Forest-San Gorgonio Pass Near Banning-
Orange County Inland Areas-
1259 PM PST Sat Dec 5 2020

...RED FLAG WARNING IN EFFECT FROM 4 AM MONDAY TO 10 PM PST
TUESDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY FOR THE
MOUNTAINS...VALLEYS...INLAND ORANGE COUNTY AND THE SAN GORGONIO 
PASS...

The National Weather Service in San Diego has issued a Red Flag
Warning...which is in effect from 4 AM Monday to 10 PM PST
Tuesday. The Fire Weather Watch is no longer in effect. 

* WIND...Northeast 20 to 30 mph with gusts to 40 mph. Local gusts
  to 50 mph in and below favored passes and canyons.

* HUMIDITY...10 to 20 percent.

* TIMING...Early Monday morning until Tuesday evening.

* IMPACTS...Any fires that develop will likely spread rapidly.
  Outdoor burning is not recommended.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$

12
10 follow-up statements
821 
WWUS86 KSGX 060537
RFWSGX

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Diego CA
937 PM PST Sat Dec 5 2020

CAZ248-250-255>258-265-554-061400-
/O.CON.KSGX.FW.W.0008.201207T1200Z-201209T0600Z/
San Bernardino and Riverside County Valleys - The Inland Empire-
San Diego County Inland Valleys-San Bernardino County Mountains-
Including The Mountain Top And Front Country Ranger Districts Of
The San Bernardino National Forest-Riverside County Mountains-
Including The San Jacinto Ranger District Of The San Bernardino
National Forest-Santa Ana Mountains-
Including The Trabuco Ranger District of the Cleveland National
Forest-San Diego County Mountains-
Including The Palomar And Descanso Ranger Districts of the
Cleveland National Forest-San Gorgonio Pass Near Banning-
Orange County Inland Areas-
937 PM PST Sat Dec 5 2020

...RED FLAG WARNING REMAINS IN EFFECT FROM 4 AM MONDAY TO 10 PM
PST TUESDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY FOR THE
MOUNTAINS...VALLEYS...INLAND ORANGE COUNTY AND THE SAN GORGONIO
PASS...

* WIND...Northeast 20 to 30 mph with gusts to 45 mph. Isolated 
  gusts around 60 mph in and below the favored passes and canyons.
 
* HUMIDITY...Minimum values around 10 percent, with poor overnight
  recovery.

* TIMING...Early Monday morning until Tuesday evening.

* IMPACTS...Any fires that develop will spread rapidly. Outdoor
  burning should be avoided.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$

jmb

for more details please go to weather.gov
358 
WWUS86 KSGX 061143
RFWSGX

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Diego CA
343 AM PST Sun Dec 6 2020

CAZ248-250-255>258-265-554-061945-
/O.CON.KSGX.FW.W.0008.201207T1200Z-201209T0600Z/
San Bernardino and Riverside County Valleys - The Inland Empire-
San Diego County Inland Valleys-San Bernardino County Mountains-
Including The Mountain Top And Front Country Ranger Districts Of
The San Bernardino National Forest-Riverside County Mountains-
Including The San Jacinto Ranger District Of The San Bernardino
National Forest-Santa Ana Mountains-
Including The Trabuco Ranger District of the Cleveland National
Forest-San Diego County Mountains-
Including The Palomar And Descanso Ranger Districts of the
Cleveland National Forest-San Gorgonio Pass Near Banning-
Orange County Inland Areas-
343 AM PST Sun Dec 6 2020

...RED FLAG WARNING REMAINS IN EFFECT FROM 4 AM MONDAY TO 10 PM
PST TUESDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY FOR THE
MOUNTAINS...VALLEYS...INLAND ORANGE COUNTY AND THE SAN GORGONIO
PASS...

* WIND...Northeast to east winds 20 to 30 mph with gusts to 50 
  mph. Isolated gusts around 60 mph in and below the favored 
  passes and canyons.
 
* HUMIDITY...Minimum values around 10 percent, with poor
  overnight recovery. 

* TIMING...Early Monday morning until Tuesday evening.

* IMPACTS...Any fires that develop will spread rapidly. Outdoor 
  burning should be avoided.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$

Connolly
998 
WWUS86 KSGX 062235
RFWSGX

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Diego CA
235 PM PST Sun Dec 6 2020

CAZ248-250-255>258-265-554-070645-
/O.CON.KSGX.FW.W.0008.201207T1200Z-201209T0600Z/
San Bernardino and Riverside County Valleys - The Inland Empire-
San Diego County Inland Valleys-San Bernardino County Mountains-
Including The Mountain Top And Front Country Ranger Districts Of
The San Bernardino National Forest-Riverside County Mountains-
Including The San Jacinto Ranger District Of The San Bernardino
National Forest-Santa Ana Mountains-
Including The Trabuco Ranger District of the Cleveland National
Forest-San Diego County Mountains-
Including The Palomar And Descanso Ranger Districts of the
Cleveland National Forest-San Gorgonio Pass Near Banning-
Orange County Inland Areas-
235 PM PST Sun Dec 6 2020

...RED FLAG WARNING REMAINS IN EFFECT FROM 4 AM MONDAY TO 10 PM
PST TUESDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY FOR THE
MOUNTAINS...VALLEYS...INLAND ORANGE COUNTY AND THE SAN GORGONIO
PASS...

* WIND...Northeast to east winds 20 to 30 mph with gusts to 55
  mph. Isolated gusts around 70 mph in and below the favored
  passes and canyons, highest in San Diego County.  

* HUMIDITY...Minimum values around 10 percent, with poor 
  overnight recovery.

* TIMING...Early Monday morning until Tuesday evening.

* IMPACTS...Any fires that develop will spread rapidly. Outdoor 
  burning should be avoided.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$

Moede
560 
WWUS86 KSGX 070539
RFWSGX

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Diego CA
939 PM PST Sun Dec 6 2020

CAZ248-250-255>258-265-554-071345-
/O.CON.KSGX.FW.W.0008.201207T1200Z-201209T0600Z/
San Bernardino and Riverside County Valleys - The Inland Empire-
San Diego County Inland Valleys-San Bernardino County Mountains-
Including The Mountain Top And Front Country Ranger Districts Of
The San Bernardino National Forest-Riverside County Mountains-
Including The San Jacinto Ranger District Of The San Bernardino
National Forest-Santa Ana Mountains-
Including The Trabuco Ranger District of the Cleveland National
Forest-San Diego County Mountains-
Including The Palomar And Descanso Ranger Districts of the
Cleveland National Forest-San Gorgonio Pass Near Banning-
Orange County Inland Areas-
939 PM PST Sun Dec 6 2020

...RED FLAG WARNING REMAINS IN EFFECT FROM 4 AM MONDAY TO 10 PM
PST TUESDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY FOR THE
MOUNTAINS...VALLEYS...INLAND ORANGE COUNTY AND THE SAN GORGONIO
PASS...
* WIND...Northeast to east winds 20 to 30 mph with gusts to 55 
  mph. Isolated gusts around 70 mph in and below the favored 
  passes and canyons, highest in San Diego County. 

* HUMIDITY...Minimum values around 10 percent, with poor 
  overnight recovery.

* TIMING...Early Monday morning until Tuesday evening.

* IMPACTS...Any fires that develop will spread rapidly. Outdoor 
  burning should be avoided.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$
810 
WWUS86 KSGX 071246
RFWSGX

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Diego CA
446 AM PST Mon Dec 7 2020

CAZ248-250-255>258-265-554-080030-
/O.CON.KSGX.FW.W.0008.000000T0000Z-201209T0600Z/
San Bernardino and Riverside County Valleys - The Inland Empire-
San Diego County Inland Valleys-San Bernardino County Mountains-
Including The Mountain Top And Front Country Ranger Districts Of
The San Bernardino National Forest-Riverside County Mountains-
Including The San Jacinto Ranger District Of The San Bernardino
National Forest-Santa Ana Mountains-
Including The Trabuco Ranger District of the Cleveland National
Forest-San Diego County Mountains-
Including The Palomar And Descanso Ranger Districts of the
Cleveland National Forest-San Gorgonio Pass Near Banning-
Orange County Inland Areas-
446 AM PST Mon Dec 7 2020

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PST TUESDAY FOR
STRONG GUSTY WINDS AND LOW HUMIDITY FOR THE MOUNTAINS...VALLEYS...INLAND
ORANGE COUNTY...AND THE SAN GORGONIO PASS...

* WIND...Areas of east to northeast winds 25 to 35 mph with gusts
  to 55 mph. Isolated gusts to 70 mph. 

* HUMIDITY...Lowest daytime humidity around 10 percent with poor 
  overnight recovery.
 
* TIMING...The strongest and most widespread winds are expected
  for tonight into Tuesday.

* IMPACTS...Any fires that develop will spread rapidly. Outdoor 
  burning should be avoided.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$

17
713 
WWUS86 KSGX 072146
RFWSGX

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Diego CA
146 PM PST Mon Dec 7 2020

CAZ248-250-255>258-265-554-080600-
/O.CON.KSGX.FW.W.0008.000000T0000Z-201209T0600Z/
San Bernardino and Riverside County Valleys - The Inland Empire-
San Diego County Inland Valleys-San Bernardino County Mountains-
Including The Mountain Top And Front Country Ranger Districts Of
The San Bernardino National Forest-Riverside County Mountains-
Including The San Jacinto Ranger District Of The San Bernardino
National Forest-Santa Ana Mountains-
Including The Trabuco Ranger District of the Cleveland National
Forest-San Diego County Mountains-
Including The Palomar And Descanso Ranger Districts of the
Cleveland National Forest-San Gorgonio Pass Near Banning-
Orange County Inland Areas-
146 PM PST Mon Dec 7 2020

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PST TUESDAY FOR
STRONG GUSTY WINDS AND LOW HUMIDITY FOR THE MOUNTAINS...VALLEYS...
INLAND ORANGE COUNTY...AND THE SAN GORGONIO PASS...

* WIND...Areas of east to northeast winds 20 to 40 mph with gusts
  to 60 mph. Isolated gusts to 70 mph in rural wind prone
  locations. 

* HUMIDITY...Lowest daytime humidity around 10 percent with 
  poor overnight recovery. 

* TIMING...The strongest winds are expected to occur this evening
  through Tuesday morning.

* IMPACTS...Any fires that develop will spread rapidly. Outdoor 
  burning should be avoided.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$
Gregoria
973 
WWUS86 KSGX 080505
RFWSGX

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Diego CA
905 PM PST Mon Dec 7 2020

CAZ248-250-255>258-265-554-081345-
/O.CON.KSGX.FW.W.0008.000000T0000Z-201209T0600Z/
San Bernardino and Riverside County Valleys - The Inland Empire-
San Diego County Inland Valleys-San Bernardino County Mountains-
Including The Mountain Top And Front Country Ranger Districts Of
The San Bernardino National Forest-Riverside County Mountains-
Including The San Jacinto Ranger District Of The San Bernardino
National Forest-Santa Ana Mountains-
Including The Trabuco Ranger District of the Cleveland National
Forest-San Diego County Mountains-
Including The Palomar And Descanso Ranger Districts of the
Cleveland National Forest-San Gorgonio Pass Near Banning-
Orange County Inland Areas-
905 PM PST Mon Dec 7 2020

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PST TUESDAY FOR
STRONG GUSTY WINDS AND LOW HUMIDITY FOR THE MOUNTAINS...VALLEYS...
INLAND ORANGE COUNTY...AND THE SAN GORGONIO PASS...

* WIND...Areas of east to northeast winds 20 to 40 mph with gusts
  to 60 mph. Isolated gusts to 75 to 80 mph in rural wind prone 
  locations. 

* HUMIDITY...Lowest daytime humidity around 10 percent with 
  poor overnight recovery.

* TIMING...The strongest winds are expected this evening through 
  Tuesday morning. 

* IMPACTS...Any fires that develop will spread rapidly. Outdoor 
  burning should be avoided.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$
788 
WWUS86 KSGX 081025
RFWSGX

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Diego CA
225 AM PST Tue Dec 8 2020

CAZ248-250-255>258-265-554-082300-
/O.CON.KSGX.FW.W.0008.000000T0000Z-201209T0600Z/
San Bernardino and Riverside County Valleys - The Inland Empire-
San Diego County Inland Valleys-San Bernardino County Mountains-
Including The Mountain Top And Front Country Ranger Districts Of
The San Bernardino National Forest-Riverside County Mountains-
Including The San Jacinto Ranger District Of The San Bernardino
National Forest-Santa Ana Mountains-
Including The Trabuco Ranger District of the Cleveland National
Forest-San Diego County Mountains-
Including The Palomar And Descanso Ranger Districts of the
Cleveland National Forest-San Gorgonio Pass Near Banning-
Orange County Inland Areas-
225 AM PST Tue Dec 8 2020

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING FOR STRONG GUSTY WINDS AND LOW HUMIDITY FOR THE 
MOUNTAINS...VALLEYS...INLAND ORANGE COUNTY...AND THE SAN GORGONIO 
PASS...

* WIND...Areas of east to northeast winds 23 to 35 mph with gusts
  to 60 mph. Isolated gusts to 70 mph. 

* HUMIDITY...Lowest daytime humidity around 10 percent with 
  poor overnight recovery.

* TIMING...The strongest winds are expected this morning. Winds
  will gradually diminish from late morning through the afternoon. 

* IMPACTS...Any fires that develop will spread rapidly. Outdoor 
  burning should be avoided.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$

17
856 
WWUS86 KSGX 082119
RFWSGX

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Diego CA
119 PM PST Tue Dec 8 2020

CAZ248-250-255>258-265-554-090530-
/O.CON.KSGX.FW.W.0008.000000T0000Z-201209T0600Z/
San Bernardino and Riverside County Valleys - The Inland Empire-
San Diego County Inland Valleys-San Bernardino County Mountains-
Including The Mountain Top And Front Country Ranger Districts Of
The San Bernardino National Forest-Riverside County Mountains-
Including The San Jacinto Ranger District Of The San Bernardino
National Forest-Santa Ana Mountains-
Including The Trabuco Ranger District of the Cleveland National
Forest-San Diego County Mountains-
Including The Palomar And Descanso Ranger Districts of the
Cleveland National Forest-San Gorgonio Pass Near Banning-
Orange County Inland Areas-
119 PM PST Tue Dec 8 2020

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING FOR STRONG GUSTY WINDS AND LOW HUMIDITY FOR THE
MOUNTAINS...VALLEYS...INLAND ORANGE COUNTY...AND THE SAN GORGONIO
PASS...

* WIND...Areas of east to northeast winds 20 to 30 mph with gusts
  to 40 mph. Isolated gusts to 50 mph. 

* HUMIDITY...Relative humidity of 5 to 10 percent rising to near
  15 percent by late evening.  

* TIMING...Through 10 PM this evening. 

* IMPACTS...Any fires that develop will spread rapidly. Outdoor 
  burning should be avoided.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$
Gregoria
852 
WWUS86 KSGX 090546
RFWSGX

URGENT - FIRE WEATHER MESSAGE
National Weather Service San Diego CA
946 PM PST Tue Dec 8 2020

CAZ248-250-255>258-265-554-090700-
/O.EXP.KSGX.FW.W.0008.000000T0000Z-201209T0600Z/
San Bernardino and Riverside County Valleys - The Inland Empire-
San Diego County Inland Valleys-San Bernardino County Mountains-
Including The Mountain Top And Front Country Ranger Districts Of
The San Bernardino National Forest-Riverside County Mountains-
Including The San Jacinto Ranger District Of The San Bernardino
National Forest-Santa Ana Mountains-
Including The Trabuco Ranger District of the Cleveland National
Forest-San Diego County Mountains-
Including The Palomar And Descanso Ranger Districts of the
Cleveland National Forest-San Gorgonio Pass Near Banning-
Orange County Inland Areas-
946 PM PST Tue Dec 8 2020

...RED FLAG WARNING WILL EXPIRE AT 10 PM PST THIS EVENING FOR THE
MOUNTAINS...VALLEYS...INLAND ORANGE COUNTY...AND THE SAN GORGONIO
PASS...

Easterly winds continue this evening with isolated spots still
reporting near Red Flag conditions. The winds are expected to
slowly decrease over the next few hours as relative humidity
increases, easing the critical fire weather conditions.


$$

10

What forecasters said that day

The local office's own words before this red flag warning 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 red flag warning went out at Dec 5, 9:47 AM PST, 3 hours 12 minutes earlier.

Area forecast discussion, Dec 5, 9:47 AM PST, 3 hours 12 minutes before
Area Forecast Discussion
National Weather Service San Diego CA
947 AM PST Sat Dec 5 2020

.SYNOPSIS...
Mostly sunny and warm days with clear and chilly nights through
the weekend. An upper level low moving in from the north then
moving offshore will bring another round of Santa Ana winds for
Monday and Tuesday. Warmer weather is in store for Monday through
Wednesday, with Tuesday being the warmest day. Onshore flow and
cooler weather look to return later next week.

&&

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

Partly cloudy and cool this morning as a weak upper level trough
moves inland to our north where the general flow aloft splits
around the high pressure center over the northern Rockies and the
low pressure center over northern Mexico. Temperatures are a mixed
bag, with some areas a few degrees warmer and some areas a few
degrees cooler than at this time yesterday. Sfc pressure gradients
remain offshore with -4.0 mb SAN-DAG and -1.4 mb SAN-IPL. The
wind-prone passes and canyons have reported wind gusts as high as
25 mph in the last hour.

Through Sunday, temperatures will remain near or slightly above
seasonal averages as weak high pressure aloft persists and
offshore pressure gradients continue to weaken. The weakening
offshore gradients will allow the sea breeze to reach farther
inland, bringing higher humidity to the western reaches of the
inland valleys where just yesterday they were experiencing
single-digit humidity. Farther inland, humidity will continue to
be low, with widespread minimum humidity of 5 to 10 percent in the
mountains, valleys and deserts. Tonight will be another chilly
night, with temperatures in the 30s for low-lying locations in
the inland valleys. Frost could form in those locations if
conditions weren't so dry.

A low pressure system will move inland over WA/OR tonight through
Sunday before tracking to the southwest across SoCal and ending up
approximately over the SoCal Bight on Monday afternoon. This will
bring another round of Santa Ana winds and very low humidity to
the region for Monday and Tuesday. There remains significant
uncertainty in the trajectory and timing of the low's movement.
This uncertainty is well represented in the spread among the
members of the various model ensembles. This lowers our confidence
in the details of the forecast. Our best estimates thus far
indicate that the winds will begin to increase in the northern
areas early Monday morning, then spread into the southern areas
Monday afternoon and evening. Winds are likely to be strongest
Monday night into Tuesday morning, with peak gusts of 40-50 mph in
the mountains and foothills, and 25-35 mph in the adjacent
valleys. Weak offshore flow will likely persist into Wednesday
morning. While this Santa Ana event will be of moderate strength,
gusty northeasterly winds will be quite widespread, reaching into
the Inland Empire, the San Diego valleys, and inland Orange
County. Inland edges of some coastal areas could also see locally
gusty northeasterly winds. A Fire Weather Watch is in effect for
the mountains, valleys, passes and inland Orange County for Monday
and Tuesday.

The offshore flow will result in warmer temperatures for Monday
through Wednesday. Tuesday will be the warmest day of the week,
with temperatures 5 to 10 degrees above seasonal averages along
the coast and in the mountains and deserts, while valley areas
will be 10 to 15 degrees above seasonal averages. It will be a
few degrees cooler on Wednesday, but still well above normal for
this time of year.

A weak trough will pass to the north on Thursday and Friday,
bringing weak onshore flow on Thursday with the possibility of
some marine layer clouds and cooler temperatures. Weak offshore
likely returns for Friday but the forecast details are highly
uncertain at this time.

&&

.AVIATION...
051630Z...SCT-FEW high clouds AOA 20000 ft MSL with unrestricted
vis through Sunday.

&&

.MARINE...
A long-period WNW swell could bring combined seas near 10 feet in
the outer waters Tue and Wed. Otherwise, no marine concerns through
the weekend.

&&

.BEACHES...
A long-period WNW swell from 290 degrees will gradually decrease
through midday, but some elevated surf to 6 feet will continue
across central and southern San Diego County. Tue and Wed a larger
long-period WNW swell from 290 degrees could bring surf of 7-10 feet
and high rip current risk.

&&

.FIRE WEATHER...
Locally gusty northeasterly winds will continue this morning in
the wind prone passes and canyons, but gusts should stay below 30
mph. Weak offshore flow will persist through the weekend, with
gusts mostly less than 25 mph. Widespread low humidity of 5 to 10
percent will continue in the mountains, valleys and deserts
through the weekend. Weak offshore flow combined with low
relative humidity, will result in elevated fire weather
conditions except in the coastal areas where some humidity
recovery is expected.

Another Santa Ana event is expected early next week. North to
northeasterly winds will begin to increase early Monday morning
in the northern areas, then spread into the southern areas by
Monday afternoon. Winds likely to be strongest Monday night into
Tuesday, with peak gusts of 40-50 mph in the mountains and
foothills, and peak gusts of 25-35 mph in the valleys. Humidity
will continue to be 15 percent or less through Tuesday, with
single-digit humidity in some inland areas. A Fire Weather Watch
remains in effect for Monday and Tuesday for the mountains,
passes, valleys, and inland Orange County. The Santa Ana winds
will weaken on Wednesday but humidity will remain low across the
inland areas

Weak onshore flow will return for Thursday and humidity recovery
could extend into the inland valleys. Offshore flow could return
on Friday but the details remain very uncertain.

&&

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

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Fire Weather Watch from late Sunday night through Tuesday
     evening for 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-San Gorgonio Pass Near Banning-
     Santa Ana Mountains-Including The Trabuco Ranger District
     of the Cleveland National Forest.

PZ...NONE.
&&

PUBLIC/FIRE WEATHER...PG
AVIATION/MARINE...CO

Nearby

Red Flag Warnings in California, 2020Every red flag warning in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.