Alert archive / California / Red Flag Warnings in 2020
Red Flag Warning 8, NWS San Diego, CA
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
| Time | Report | Where | Remark |
|---|---|---|---|
| Dec 7, 5:40 PM PST | NON-TSTM WND GST 56 | 5 E Rainbow, CA | MESONET STATION RHSSD RANCHO HEIGHTS (SDGE). |
| Dec 7, 6:30 PM PST | NON-TSTM WND GST 81 | 7 E Valley Center, CA | MESONET STATION HHCSD HELLHOLE CANYON (SDGE). |
| Dec 7, 6:30 PM PST | NON-TSTM WND GST 82 | 7 E Valley Center, CA | MESONET STATION HHCSD HELLHOLE CANYON (SDGE). |
| Dec 7, 7:00 PM PST | NON-TSTM WND GST 57 | 2 N Alpine, CA | MESONET STATION AVYSD ANDERSON VALLEY (SDGE). |
| Dec 7, 8:10 PM PST | NON-TSTM WND GST 59 | 2 Sw Idyllwild, CA | MESONET STATION SE092 IDYLLWILD WEST RIDGE 1 (SCE092). |
| Dec 7, 8:20 PM PST | NON-TSTM WND GST 57 | 2 E Mountain Center, CA | MESONET STATION SE375 KEEN RIDGE (SCE375). |
| Dec 7, 8:30 PM PST | NON-TSTM WND GST 55 | 7 Ene Alpine, CA | MESONET STATION NDCSD NORTH DESCANSO (SDGE). |
| Dec 7, 8:30 PM PST | NON-TSTM WND GST 58 | 4 Wsw Santa Ysabel, CA | MESONET STATION WCKSD WITCH CREEK (SDGE). |
| Dec 7, 8:40 PM PST | NON-TSTM WND GST 55 | 4 E Yucaipa, CA | MESONET STATION SE085 PIGSAH PEAK (SCE085). |
| Dec 7, 8:50 PM PST | NON-TSTM WND GST 55 | 5 Ene Alpine, CA | MESONET STATION VGDSD VIEJAS GRADE (SDGE). |
| Dec 7, 9:10 PM PST | NON-TSTM WND GST 58 | 3 Sw Santa Ysabel, CA | MESONET STATION DYESD DYE MOUNTAIN (SDGE). |
| Dec 7, 10:03 PM PST | NON-TSTM WND GST 65 | 13 Sw La Quinta, CA | MESONET STATION HP003 TORO PEAK (HPWREN). |
| Dec 7, 10:03 PM PST | NON-TSTM WND GST 69 | 13 Sw La Quinta, CA | MESONET STATION HP003 TORO PEAK (HPWREN). |
| Dec 7, 10:05 PM PST | NON-TSTM WND GST 68 | 3 Wnw Palomar Mountain, CA | MESONET STATION HP014 BOUCHER HILL (HPWREN). |
| Dec 7, 10:05 PM PST | NON-TSTM WND GST 70 | 3 Wnw Palomar Mountain, CA | MESONET STATION HP014 BOUCHER HILL (HPWREN). |
| Dec 7, 10:14 PM PST | NON-TSTM WND GST 57 | 5 S Banning, CA | MESONET STATION POPC1 POPPET FLATS RAWS. |
| Dec 7, 10:15 PM PST | NON-TSTM WND GST 65 | 3 S Crestline, CA | MESONET STATION HF008 MARSHALL PEAK (SDHGPA). |
| Dec 7, 10:17 PM PST | NON-TSTM WND GST 57 | 1 Ne Mountain Center, CA | MESONET STATION KNWC1 SAN MARCOS 3. |
| Dec 7, 10:20 PM PST | NON-TSTM WND GST 55 | 3 S Palomar Mountain, CA | MESONET STATION POMSD POOMACHA (SDGE). |
| Dec 7, 10:20 PM PST | NON-TSTM WND GST 62 | 3 Ssw Banning, CA | MESONET STATION SE700 BANNING (SCE700). |
| Dec 7, 11:00 PM PST | NON-TSTM WND GST 62 | 2 N Santa Ysabel, CA | MESONET STATION SYRSD SANTA YSABEL RANCH (SDGE). |
| Dec 7, 11:13 PM PST | NON-TSTM WND GST 61 | 4 Nnw Banning, CA | MESONET STATION BNJC1 BANNING RAWS. |
| Dec 8, 12:00 AM PST | NON-TSTM WND GST 60 | 1 Nnw Idyllwild, CA | MESONET STATION FW6883 PINE COVE ROCKY POINT. |
| Dec 8, 12:30 AM PST | NON-TSTM WND GST 62 | 3 S Crestline, CA | MESONET STATION HF008 MARSHALL PEAK (SDHGPA). |
| Dec 8, 1:30 AM PST | NON-TSTM WND GST 57 | 3 Ssw Banning, CA | MESONET STATION SE700 BANNING (SCE700). |
| Dec 8, 2:13 AM PST | NON-TSTM WND GST 56 | 4 Nnw Banning, CA | MESONET STATION BNJC1 BANNING RAWS. |
| Dec 8, 2:14 AM PST | NON-TSTM WND GST 61 | 5 Wsw Dulzura, CA | MESONET STATION OTYC1 OTAY MOUNTAIN RAWS. |
| Dec 8, 3:30 AM PST | NON-TSTM WND GST 57 | 7 Nw Mt Laguna, CA | MESONET STATION HF002 LAGUNA LAUNCH (SDHGPA). |
| Dec 8, 4:00 AM PST | NON-TSTM WND DMG | 7 S Julian, CA | 4 INCH DIAMETER TREE LIMB DOWN OFF OF A HEALTHY CEDAR TREE. TIME ESTIMATED. |
| Dec 8, 4:43 AM PST | NON-TSTM WND GST 56 | 6 N Dulzura, CA | MESONET STATION HP002 LYONS PEAK (HPWREN). |
| Dec 8, 5:55 AM PST | NON-TSTM WND GST 65 | 9 Wnw Santa Ysabel, CA | MESONET STATION HP016 BIG BLACK MOUNTAIN (HPWREN). |
| Dec 8, 8:15 AM PST | NON-TSTM WND GST 65 | 5 Wnw Palomar Mountain, CA | MESONET STATION HF001 PALOMAR MTN LAUNCH (SDHGPA). |
| Dec 8, 8:20 AM PST | NON-TSTM WND GST 71 | 9 Ssw Julian, CA | MESONET STATION SILSD SILL HILL (SDGE). |
| Dec 8, 8:55 AM PST | NON-TSTM WND GST 77 | 9 Wnw Santa Ysabel, CA | MESONET STATION HP016 BIG BLACK MOUNTAIN (HPWREN). |
| Dec 8, 8:55 AM PST | NON-TSTM WND GST 80 | 9 Wnw Santa Ysabel, CA | MESONET STATION HP016 BIG BLACK MOUNTAIN (HPWREN). |
| Dec 8, 10:51 AM PST | NON-TSTM WND GST 65 | 8 Ene Orange, CA | MESONET 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.
- 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
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...CONearby
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.