Alert archive / California / Red Flag Warnings in 2021
Red Flag Warning 3, NWS San Diego, CA
NWS San Diego, CA issued this red flag warning at Nov 19, 2021, 1:35 PM PST for 4 counties in California. It took effect at Nov 21, 2021, 9:00 AM PST. It was in force for 10 hr. 4 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
- Nov 19, 2021, 1:35 PM PST (21:35 UTC)
- In effect from
- Nov 21, 2021, 9:00 AM PST
- Expired
- Nov 21, 2021, 7:00 PM PST
- In force
- 10 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 21:41 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 |
|---|---|---|---|
| Nov 21, 9:20 AM PST | NON-TSTM WND GST 67 | 2 Ssw Lake Arrowhead, CA | ARROWHEAD SPRINGS (189SE) PEAK WIND GUST. |
| Nov 21, 9:30 AM PST | NON-TSTM WND GST 58 | 4 Sse Lytle Creek, CA | DUNCAN CANYON (SCE533) PEAK WIND GUST. |
| Nov 21, 9:40 AM PST | NON-TSTM WND GST 57 | 8 Ne Alpine, CA | SILL HILL PEAK WIND GUST. |
| Nov 21, 9:51 AM PST | NON-TSTM WND GST 55 | 8 Nne Mission Viejo, CA | FREMONT CANYON PEAK WIND GUST. |
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, 9.6 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
- 1842 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 59 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
540 WWUS86 KSGX 192135 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 135 PM PST Fri Nov 19 2021 CAZ248-255>257-265-554-200545- /O.UPG.KSGX.FW.A.0002.211121T1700Z-211122T0300Z/ /O.NEW.KSGX.FW.W.0003.211121T1700Z-211122T0300Z/ 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-San Gorgonio Pass Near Banning-Orange County Inland Areas- 135 PM PST Fri Nov 19 2021 ...RED FLAG WARNING IN EFFECT FROM 9 AM TO 7 PM PST SUNDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY... The National Weather Service in San Diego has issued a Red Flag Warning...which is in effect from 9 AM to 7 PM PST Sunday. The Fire Weather Watch is no longer in effect. * LOCATION...Portions of the Inland Empire, the San Bernardino mountain slopes, the Riverside County mountain slopes, the Santa Ana Mountains and inland Orange County. * WIND...Areas of northeast winds 20 to 30 mph with gusts 45 to 55 mph. Isolated gusts 60 to 65 mph below the Cajon and San Gorgonio Passes, and near the coastal foothills of the Santa Ana Mountains. * HUMIDITY...Lowest humidity of 5 to 10 percent Sunday afternoon. * TIMING...Winds strengthen Saturday night, peak early Sunday morning then begin to weaken Sunday afternoon. Relative humidity begins to decrease late Sunday Morning with only marginal recovery Sunday night. * 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. && $$
7 follow-up statements
500 WWUS86 KSGX 200523 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 923 PM PST Fri Nov 19 2021 CAZ248-255>257-265-554-201400- /O.CON.KSGX.FW.W.0003.211121T1700Z-211122T0300Z/ San Bernardino and Riverside County Valleys - The Inland Empire- San Bernardino County Mountains- Including The Mountain Top And Front Country Ranger Districts Of The San Bernardino National Forest-Riverside County Mountains- Including The San Jacinto Ranger District Of The San Bernardino National Forest-Santa Ana Mountains- Including The Trabuco Ranger District of the Cleveland National Forest-San Gorgonio Pass Near Banning-Orange County Inland Areas- 923 PM PST Fri Nov 19 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 9 AM TO 7 PM PST SUNDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY... * LOCATION...Portions of the Inland Empire, the San Bernardino mountain slopes, the Riverside County mountain slopes, the Santa Ana Mountains and inland Orange County. * WIND...Areas of northeast winds 20 to 30 mph with gusts 45 to 55 mph. Isolated gusts 60 to 65 mph below the Cajon and San Gorgonio Passes, and near the coastal foothills of the Santa Ana Mountains. * HUMIDITY...Lowest humidity of 5 to 10 percent Sunday afternoon. * TIMING...Winds strengthen Saturday night, peak early Sunday morning then begin to weaken Sunday afternoon. Relative humidity begins to decrease late Sunday Morning with only marginal recovery expected Sunday night. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ jmb
327 WWUS86 KSGX 201100 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 300 AM PST Sat Nov 20 2021 CAZ248-255>257-265-554-202100- /O.CON.KSGX.FW.W.0003.211121T1700Z-211122T0300Z/ 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-San Gorgonio Pass Near Banning-Orange County Inland Areas- 300 AM PST Sat Nov 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 9 AM TO 7 PM SUNDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY... * LOCATION...Portions of the Inland Empire, the San Bernardino mountain slopes, the Riverside County mountain slopes, the Santa Ana Mountains and inland Orange County. * WIND...Areas of northeast winds 20 to 30 mph with gusts 45 to 55 mph. Isolated gusts 60 to 65 mph below the Cajon and San Gorgonio Passes, and near the coastal foothills of the Santa Ana Mountains. * HUMIDITY...Lowest humidity of 5 to 10 percent Sunday afternoon. * TIMING...Winds strengthen tonight, peak Sunday morning then begin to weaken Sunday afternoon. Relative humidity begins to decrease late Sunday morning with only marginal recovery Sunday night. * 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. && $$ Moede
543 WWUS86 KSGX 202109 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 109 PM PST Sat Nov 20 2021 CAZ248-255>257-265-554-210600- /O.CON.KSGX.FW.W.0003.211121T1700Z-211122T0300Z/ San Bernardino and Riverside County Valleys - The Inland Empire- San Bernardino County Mountains- Including The Mountain Top And Front Country Ranger Districts Of The San Bernardino National Forest-Riverside County Mountains- Including The San Jacinto Ranger District Of The San Bernardino National Forest-Santa Ana Mountains- Including The Trabuco Ranger District of the Cleveland National Forest-San Gorgonio Pass Near Banning-Orange County Inland Areas- 109 PM PST Sat Nov 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 9 AM TO 7 PM PST SUNDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY... * LOCATION...Portions of the Inland Empire, the San Bernardino mountain slopes, the Riverside County mountain slopes, the Santa Ana Mountains and inland Orange County. * WIND...Areas of northeast winds 20 to 30 mph with gusts 45 to 55 mph. Isolated gusts 60 to 65 mph below the Cajon and San Gorgonio Passes, and near the coastal foothills of the Santa Ana Mountains. * HUMIDITY...Lowest humidity of 5 to 10 percent Sunday afternoon. * TIMING...Winds strengthen tonight, peak Sunday morning then begin to weaken Sunday afternoon. Relative humidity begins to decrease late Sunday morning with only marginal recovery Sunday night. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
371 WWUS86 KSGX 210425 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 825 PM PST Sat Nov 20 2021 CAZ248-255>257-265-554-211400- /O.CON.KSGX.FW.W.0003.211121T1700Z-211122T0300Z/ 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-San Gorgonio Pass Near Banning-Orange County Inland Areas- 825 PM PST Sat Nov 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 9 AM TO 7 PM PST SUNDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY... * LOCATION...Portions of the Inland Empire, the San Bernardino mountain slopes, the Riverside County mountain slopes, the Santa Ana Mountains and inland Orange County. * WIND...Areas of northeast winds 20 to 30 mph with gusts 45 to 55 mph. Isolated gusts 60 to 65 mph below the Cajon and San Gorgonio Passes, and near the coastal foothills of the Santa Ana Mountains. * HUMIDITY...Lowest humidity of 5 to 10 percent Sunday afternoon. * TIMING...Winds strengthen tonight, peak Sunday morning then begin to weaken Sunday afternoon. Relative humidity begins to decrease late Sunday morning with only marginal recovery Sunday night. * 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 heat, can contribute to extreme fire behavior. && $$
153 WWUS86 KSGX 211248 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 448 AM PST Sun Nov 21 2021 CAZ248-255>257-265-554-212130- /O.CON.KSGX.FW.W.0003.211121T1700Z-211122T0300Z/ San Bernardino and Riverside County Valleys - The Inland Empire- San Bernardino County Mountains- Including The Mountain Top And Front Country Ranger Districts Of The San Bernardino National Forest-Riverside County Mountains- Including The San Jacinto Ranger District Of The San Bernardino National Forest-Santa Ana Mountains- Including The Trabuco Ranger District of the Cleveland National Forest-San Gorgonio Pass Near Banning-Orange County Inland Areas- 448 AM PST Sun Nov 21 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 9 AM TO 7 PM TODAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY... * LOCATION...Portions of the Inland Empire, the San Bernardino mountain slopes, the Riverside County mountain slopes, the Santa Ana Mountains and inland Orange County. * WIND...Areas of northeast winds 20 to 30 mph with gusts 45 to 55 mph. Isolated gusts 60 to 65 mph below the Cajon and San Gorgonio Passes, and near the foothills of the Santa Ana Mountains. * HUMIDITY...Lowest humidity of 10 percent this afternoon. * TIMING...Winds will peak this morning, then begin to weaken this afternoon and evening. Relative humidity falls through the afternoon with only marginal recovery tonight and Monday. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and heat, can contribute to extreme fire behavior. && $$ Moede
718 WWUS86 KSGX 212049 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 1249 PM PST Sun Nov 21 2021 CAZ248-255>257-265-554-220300- /O.CON.KSGX.FW.W.0003.000000T0000Z-211122T0300Z/ 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-San Gorgonio Pass Near Banning-Orange County Inland Areas- 1249 PM PST Sun Nov 21 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM PST THIS EVENING FOR STRONG GUSTY WINDS AND LOW HUMIDITY FOR PORTIONS OF THE SAN BERNARDINO MOUNTAINS, RIVERSIDE COUNTY MOUNTAINS, SANTA ANA MOUNTAINS, THE INLAND EMPIRE, INLAND ORANGE COUNTY, AND THE SAN GORGONIO PASS... * LOCATION...Portions of the Inland Empire, the San Bernardino coastal slopes and foothills, the Riverside County coastal slopes and foothills, the Santa Ana Mountains, and inland Orange County. * WIND...Areas of northeast to east winds 20 to 30 mph with gusts 40 to 50 mph. Isolated gusts to 55 mph below the Cajon and San Gorgonio Passes, and in the favored canyons of the Santa Ana Mountains. * HUMIDITY...Lowest humidity of 10-15 percent this afternoon. Poor recovery tonight in the wind prone locations. * TIMING...Winds will continue to weaken this afternoon into tonight. Dry conditions continuing into Monday. * 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 heat, can contribute to extreme fire behavior. && $$ SS
146 WWUS86 KSGX 220253 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 653 PM PST Sun Nov 21 2021 CAZ248-255>257-265-554-220400- /O.EXP.KSGX.FW.W.0003.000000T0000Z-211122T0300Z/ San Bernardino and Riverside County Valleys - The Inland Empire- San Bernardino County Mountains- Including The Mountain Top And Front Country Ranger Districts Of The San Bernardino National Forest-Riverside County Mountains- Including The San Jacinto Ranger District Of The San Bernardino National Forest-Santa Ana Mountains- Including The Trabuco Ranger District of the Cleveland National Forest-San Gorgonio Pass Near Banning-Orange County Inland Areas- 653 PM PST Sun Nov 21 2021 ...RED FLAG WARNING WILL EXPIRE AT 7 PM PST THIS EVENING FOR STRONG GUSTY WINDS AND LOW HUMIDITY. Locally strong winds below passes and some canyons will continue elevated fire weather conditions overnight into Monday, but critical fire weather conditions are no longer expected for any length of time. $$ 10
The office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 19, 4:00 AM PST | Dense Fog Advisory | SGX | Riverside, San Bernardino, San Diego | 5 hr |
| Nov 19, 10:48 AM PST | Fire Weather Watch | SGX | Orange, Riverside, San Bernardino, San Diego | 3 hr |
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.