Alert archive / California / Red Flag Warnings in 2021
Red Flag Warning 1, NWS San Diego, CA
NWS San Diego, CA issued this red flag warning at Jan 13, 2021, 12:51 PM PST for 4 counties in California. It took effect at Jan 14, 2021, 4:00 PM PST. It was in force for 48 hr. 1 report 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
- Jan 13, 2021, 12:51 PM PST (20:51 UTC)
- In effect from
- Jan 14, 2021, 4:00 PM PST
- Expired
- Jan 16, 2021, 4:00 PM PST
- In force
- 48 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 20:52 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 |
|---|---|---|---|
| Jan 15, 1:15 AM PST | WILDFIRE | 3 Ene Mountain Center, CA | BONITA FIRE WAS REPORTED TO START AT 116 AM PST ON 28000 BLOCK OF BONITA VISTA. FIRE IS AROUND 600 ACRES AND SANTA ANA WINDS ARE OCCURRING. HIGHWAY 243 IS CLOSED AND FIRE JUMPED HIGHWAY 74. EVACUATION ORDERS ARE IN PLACE. HUMIDITY IS BELOW 10 PERCENT WHERE WIN |
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, 8.9 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
- 3529 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 24 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
021 WWUS86 KSGX 132051 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 1251 PM PST Wed Jan 13 2021 .A period of Santa Ana winds is expected for Thursday evening into Friday afternoon resulting in areas of critical fire weather conditions. CAZ248-255>257-554-140615- /O.NEW.KSGX.FW.W.0001.210115T0000Z-210116T0000Z/ San Bernardino and Riverside County Valleys - The Inland Empire- 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-Orange County Inland Areas- 1251 PM PST Wed Jan 13 2021 ...RED FLAG WARNING IN EFFECT FROM 4 PM THURSDAY TO 4 PM PST FRIDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY FOR THE COASTAL MOUNTAIN SLOPES OF THE SAN BERNARDINO, RIVERSIDE, AND SANTA ANA MOUNTAINS, AS WELL AS PORTIONS OF INLAND ORANGE COUNTY AND THE INLAND EMPIRE... The National Weather Service in San Diego has issued a Red Flag Warning...which is in effect from 4 PM Thursday to 4 PM PST Friday. * WIND...North to northeast winds 20 to 25 mph with gusts to 50 mph. Isolated gusts up to 55 mph possible in wind prone locations like below the Cajon Pass, San Gorgonio Pass, and Santa Ana Mountain canyons. * HUMIDITY...8 to 12 percent. * TIMING...Thursday evening through late Friday afternoon. Strongest winds will occur Friday morning. * OUTLOOK...A period of weaker Santa Ana winds is expected late Saturday into Sunday morning, followed by a period of potentially stronger Santa Ana winds early next week. * 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. && $$ CO
9 follow-up statements
703 WWUS86 KSGX 140519 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 919 PM PST Wed Jan 13 2021 .A period of Santa Ana winds is expected for Thursday evening into Friday afternoon resulting in areas of critical fire weather conditions. CAZ248-255>257-554-141330- /O.CON.KSGX.FW.W.0001.210115T0000Z-210116T0000Z/ San Bernardino and Riverside County Valleys - The Inland Empire- San Bernardino County Mountains- Including The Mountain Top And Front Country Ranger Districts Of The San Bernardino National Forest-Riverside County Mountains- Including The San Jacinto Ranger District Of The San Bernardino National Forest-Santa Ana Mountains- Including The Trabuco Ranger District of the Cleveland National Forest-Orange County Inland Areas- 919 PM PST Wed Jan 13 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 4 PM THURSDAY TO 4 PM PST FRIDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY FOR THE COASTAL MOUNTAIN SLOPES OF THE SAN BERNARDINO, RIVERSIDE, AND SANTA ANA MOUNTAINS, AS WELL AS PORTIONS OF INLAND ORANGE COUNTY AND THE INLAND EMPIRE... * WIND...North to northeast winds 20 to 25 mph with gusts to 50 mph. Isolated gusts up to 55 mph possible in wind prone locations like below the Cajon Pass, San Gorgonio Pass, and Santa Ana Mountain canyons. * HUMIDITY...8 to 12 percent. * TIMING...Thursday evening through late Friday afternoon. Strongest winds will occur Friday morning. * OUTLOOK...A period of weaker Santa Ana winds is expected late Saturday into Sunday morning, followed by a period of potentially stronger Santa Ana winds early next week. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ Gregoria
402 WWUS86 KSGX 141029 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 229 AM PST Thu Jan 14 2021 CAZ248-255>257-554-142330- /O.CON.KSGX.FW.W.0001.210115T0000Z-210116T0000Z/ San Bernardino and Riverside County Valleys - The Inland Empire- 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-Orange County Inland Areas- 229 AM PST Thu Jan 14 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 4 PM THIS AFTERNOON TO 4 PM PST FRIDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY FOR LOWER COASTAL SLOPES OF THE MOUNTAINS OF SAN BERNARDINO AND RIVERSIDE COUNTIES...PORTIONS OF THE INLAND EMPIRE BELOW THE CAJON AND SAN GORGONIO PASSES...AND ALONG AND NEAR THE LOWER COASTAL SLOPES OF THE SANTA ANA MOUNTAINS... * WIND...Areas of north to northeast winds 20 to 30 mph with gusts to 45 mph. Isolated gusts to 55 mph in wind prone locations near and below the Cajon and San Gorgonio Passes, and along and near the lower coastal slopes of the Santa Ana Mountains. * HUMIDITY...Lowest humidity of 10 to 15 percent today and 8 to 12 percent Friday with poor overnight recovery. * TIMING...Greatest coverage of critical fire weather conditions will be this afternoon and again late morning into the early afternoon on Friday. * OUTLOOK...A period of weaker Santa Ana winds is expected late Saturday into Sunday morning, followed by a period of potentially stronger winds early next week. * 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. && $$ 17
277 WWUS86 KSGX 142104 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 104 PM PST Thu Jan 14 2021 .Gusty Santa Ana winds are expected this evening into Friday afternoon resulting in areas of critical fire weather conditions. CAZ248-255>257-554-150615- /O.CON.KSGX.FW.W.0001.210115T0000Z-210116T0000Z/ San Bernardino and Riverside County Valleys - The Inland Empire- 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-Orange County Inland Areas- 104 PM PST Thu Jan 14 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 4 PM THIS AFTERNOON TO 4 PM PST FRIDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY FOR LOWER COASTAL SLOPES OF THE MOUNTAINS OF SAN BERNARDINO AND RIVERSIDE COUNTIES...PORTIONS OF THE INLAND EMPIRE BELOW THE CAJON AND SAN GORGONIO PASSES...AND ALONG AND NEAR THE LOWER COASTAL SLOPES OF THE SANTA ANA MOUNTAINS... * WIND...Areas of north to northeast winds 20 to 30 mph with gusts to 45 to 50 mph. Isolated gusts of 55 to 60 mph in wind prone locations near and below the Cajon and San Gorgonio Passes, and along and near the lower coastal slopes of the Santa Ana Mountains. * HUMIDITY...Lowest humidity of 10 to 15 percent today and 8 to 12 percent Friday with poor overnight recovery. * TIMING...Greatest coverage of critical fire weather conditions will be this afternoon and again late morning into the early afternoon on Friday. * OUTLOOK...A period of weaker Santa Ana winds is expected late Saturday into Sunday morning, followed by a period of potentially stronger winds early next week. * 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. && $$ CO
069 WWUS86 KSGX 150532 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 932 PM PST Thu Jan 14 2021 .Gusty Santa Ana winds tonight into Friday afternoon with areas of critical fire weather conditions. CAZ248-255>257-554-151415- /O.CON.KSGX.FW.W.0001.000000T0000Z-210116T0000Z/ San Bernardino and Riverside County Valleys - The Inland Empire- 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-Orange County Inland Areas- 932 PM PST Thu Jan 14 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 4 PM FRIDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY FOR LOWER COASTAL SLOPES OF THE MOUNTAINS OF SAN BERNARDINO AND RIVERSIDE COUNTIES...PORTIONS OF THE INLAND EMPIRE BELOW THE CAJON AND SAN GORGONIO PASSES... AND ALONG AND NEAR THE LOWER COASTAL SLOPES OF THE SANTA ANA MOUNTAINS... * WIND...Areas of north to northeast winds 20 to 30 mph with gusts to 45 to 50 mph. Isolated gusts to 60 mph in wind prone locations near and below the Cajon and San Gorgonio Passes, and along and near the lower coastal slopes of the Santa Ana Mountains. * HUMIDITY...Lowest humidity 8 to 12 percent Friday. * OUTLOOK...A period of weaker Santa Ana winds late Saturday into Sunday morning, followed by a period of potentially stronger winds early next week. * 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. && $$ Moede
276 WWUS86 KSGX 151710 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 910 AM PST Fri Jan 15 2021 CAZ248-255>257-554-152200- /O.EXT.KSGX.FW.W.0001.000000T0000Z-210117T0000Z/ San Bernardino and Riverside County Valleys - The Inland Empire- San Bernardino County Mountains- Including The Mountain Top And Front Country Ranger Districts Of The San Bernardino National Forest-Riverside County Mountains- Including The San Jacinto Ranger District Of The San Bernardino National Forest-Santa Ana Mountains- Including The Trabuco Ranger District of the Cleveland National Forest-Orange County Inland Areas- 910 AM PST Fri Jan 15 2021 ...RED FLAG WARNING NOW IN EFFECT UNTIL 4 PM PST SATURDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY FOR FOR LOWER COASTAL SLOPES OF THE MOUNTAINS OF SAN BERNARDINO AND RIVERSIDE COUNTIES...PORTIONS OF THE INLAND EMPIRE BELOW THE CAJON AND SAN GORGONIO PASSES... AND ALONG AND NEAR THE LOWER COASTAL SLOPES OF THE SANTA ANA MOUNTAINS... * WIND...Areas of north to northeast winds 20 to 30 mph with gusts 40 to 50 mph this morning, decreasing this afternoon. Winds increase again Saturday, areas 20 to 30 mph with gusts 35 to 45 mph, particularly in foothills and below canyons and passes. * TIMING...Today and again Saturday. * HUMIDITY...Lowest humidity 8 to 12 percent today, 10 to 15 percent Saturday. Moderate recovery tonight. * OUTLOOK...Decreasing winds Sunday. A period of stronger winds are expected Monday through Tuesday, but with higher humidity. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
790 WWUS86 KSGX 160322 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 722 PM PST Fri Jan 15 2021 CAZ248-255>257-554-161300- /O.CON.KSGX.FW.W.0001.000000T0000Z-210117T0000Z/ San Bernardino and Riverside County Valleys - The Inland Empire- 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-Orange County Inland Areas- 722 PM PST Fri Jan 15 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 4 PM SATURDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY FOR THE MOUNTAINS OF SAN BERNARDINO AND RIVERSIDE COUNTIES...PORTIONS OF THE INLAND EMPIRE BELOW THE CAJON AND SAN GORGONIO PASSES...AND THE SANTA ANA MOUNTAINS. * WIND...Areas of north to northeast winds 20 to 30 mph with gusts 35 to 45 mph. * TIMING...Tonight and Saturday. * HUMIDITY...10 to 15 percent Saturday. * OUTLOOK...Decreasing winds Sunday. A period of stronger winds are expected Monday through Tuesday, but with higher humidity. * 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. && $$ Moede
612 WWUS86 KSGX 161335 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 535 AM PST Sat Jan 16 2021 CAZ248-255>257-554-162145- /O.CON.KSGX.FW.W.0001.000000T0000Z-210117T0000Z/ San Bernardino and Riverside County Valleys - The Inland Empire- San Bernardino County Mountains- Including The Mountain Top And Front Country Ranger Districts Of The San Bernardino National Forest-Riverside County Mountains- Including The San Jacinto Ranger District Of The San Bernardino National Forest-Santa Ana Mountains- Including The Trabuco Ranger District of the Cleveland National Forest-Orange County Inland Areas- 535 AM PST Sat Jan 16 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 4 PM PST THIS AFTERNOON FOR STRONG GUSTY WINDS AND LOW HUMIDITY FOR THE MOUNTAINS OF SAN BERNARDINO AND RIVERSIDE COUNTIES...PORTIONS OF THE INLAND EMPIRE BELOW THE CAJON AND SAN GORGONIO PASSES...AND THE SANTA ANA MOUNTAINS... * WIND...Areas of north to northeast winds 20 to 30 mph with gusts 35 to 45 mph. Isolated gusts to 60 mph in wind-prone passes and canyons. * TIMING...Through this afternoon. * HUMIDITY...10 to 15 percent. * OUTLOOK...Decreasing winds Sunday. A period of stronger winds are expected late Monday through Tuesday, but with higher humidity. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ 10
026 WWUS86 KSGX 162149 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 149 PM PST Sat Jan 16 2021 CAZ248-255>257-554-170000- /O.CON.KSGX.FW.W.0001.000000T0000Z-210117T0000Z/ San Bernardino and Riverside County Valleys - The Inland Empire- 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-Orange County Inland Areas- 149 PM PST Sat Jan 16 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 4 PM PST THIS AFTERNOON FOR STRONG GUSTY WINDS AND LOW HUMIDITY FOR THE MOUNTAINS OF SAN BERNARDINO AND RIVERSIDE COUNTIES...PORTIONS OF THE INLAND EMPIRE BELOW THE CAJON AND SAN GORGONIO PASSES...AND THE SANTA ANA MOUNTAINS... * WIND...Areas of north to northeast winds 15 to 25 mph with local gusts 35 to 45 mph. * TIMING...Through this afternoon. * HUMIDITY...10 to 15 percent. * OUTLOOK...Slight decrease in winds Sunday but continued very low humidity. A period of strong winds is expected late Monday through Tuesday, but with higher humidity. * 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. && $$ Maxwell
909 WWUS86 KSGX 162354 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 354 PM PST Sat Jan 16 2021 .Critical fire weather conditions have largely subsided, so the Red Flag Warning will be allowed to expire at 4 PM. CAZ248-255>257-554-170100- /O.EXP.KSGX.FW.W.0001.000000T0000Z-210117T0000Z/ San Bernardino and Riverside County Valleys - The Inland Empire- San Bernardino County Mountains- Including The Mountain Top And Front Country Ranger Districts Of The San Bernardino National Forest-Riverside County Mountains- Including The San Jacinto Ranger District Of The San Bernardino National Forest-Santa Ana Mountains- Including The Trabuco Ranger District of the Cleveland National Forest-Orange County Inland Areas- 354 PM PST Sat Jan 16 2021 ...RED FLAG WARNING WILL EXPIRE AT 4 PM PST THIS AFTERNOON... Santa Ana winds have mostly weakened below warning criteria, thus the Red Flag Warning will be allowed to expire at 4 PM. A few isolated locations near passes and mountain slopes may continue to experience brief critical fire weather conditions at times through Sunday, with local gusts to around 40 or 45 mph possible. Persistent dry conditions with minimum humidity near 10% will keep inland areas under elevated fire weather conditions into Sunday. $$ Rodriguez
The office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 13, 1:35 PM PST | Beach Hazards Statement | SGX | Orange, San Diego | 6 days |
Nearby
Red Flag Warnings in California, 2021Every red flag warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.