Alert archive / California / Red Flag Warnings in 2018
Red Flag Warning 2, NWS San Diego, CA
NWS San Diego, CA issued this red flag warning at Feb 9, 2018, 10:21 AM PST for 4 counties in California. It took effect at Feb 10, 2018, 10:00 PM PST. It was in force for 15 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Feb 9, 2018, 10:21 AM PST (18:21 UTC)
- In effect from
- Feb 10, 2018, 10:00 PM PST
- Expired
- Feb 11, 2018, 1:00 PM PST
- In force
- 15 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 18:21 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
San Diego, CA (KNKX), launched 12:00Z, 6.4 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
- 3173 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 23 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
739 WWUS86 KSGX 091821 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 1021 AM PST Fri Feb 9 2018 CAZ554-091930- /O.CAN.KSGX.FW.A.0002.180211T0600Z-180211T2100Z/ Orange County Inland Areas- 1021 AM PST Fri Feb 9 2018 ...FIRE WEATHER WATCH IS CANCELLED FOR INLAND ORANGE COUNTY AREAS... The National Weather Service in San Diego has cancelled the Fire Weather Watch. Gusty Santa Ana winds are likely Saturday night and Sunday with gusts to 30 mph at times, however critical relative humidity values are no longer expected. $$ CAZ248-255>257-265-100600- /O.UPG.KSGX.FW.A.0002.180211T0600Z-180211T2100Z/ /O.NEW.KSGX.FW.W.0002.180211T0600Z-180211T2100Z/ San Bernardino and Riverside County Valleys - The Inland Empire- San Bernardino County Mountains- Including The Mountain Top And Front Country Ranger Districts Of The San Bernardino National Forest-Riverside County Mountains- Including The San Jacinto Ranger District Of The San Bernardino National Forest-Santa Ana Mountains- Including The Trabuco Ranger District of the Cleveland National Forest-San Gorgonio Pass Near Banning- 1021 AM PST Fri Feb 9 2018 ...RED FLAG WARNING IN EFFECT FROM 10 PM SATURDAY TO 1 PM PST SUNDAY FOR STRONG SANTA ANA WINDS AND LOW HUMIDITY... The National Weather Service in San Diego has issued a a Red Flag Warning...which is in effect from 10 PM Saturday to 1 PM PST Sunday. The Fire Weather Watch is no longer in effect. * WIND...Gusty north-northeast Santa Ana winds will develop Saturday evening and become strong overnight. The strongest gusts in coastal foothills and just below passes will reach 55 mph at times. * HUMIDITY...Relative humidity values will plummet Sunday into the single digits. * OUTLOOK...Conditions will quickly improve Sunday night as a low pressure system brings a humid onshore flow. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning should be avoided. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ jmb weather.gov/sandiego
5 follow-up statements
448 WWUS86 KSGX 101131 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 331 AM PST Sat Feb 10 2018 ...RED FLAG WARNING FOR THE MOUNTAINS OF ORANGE...SAN BERNARDINO...AND RIVERSIDE COUNTIES...THE INLAND EMPIRE...AND THE SAN GORGONIO PASS FOR LATE TONIGHT THROUGH EARLY SUNDAY AFTERNOON FOR STRONG GUSTY WINDS AND LOW HUMIDITY... .Surface high pressure over the Great Basin will bring a period of stronger and gusty north to northeast winds for late tonight through Sunday morning along with low inland humidities. Winds will diminish Sunday afternoon and humidities will recover rapidly late Sunday night as onshore flow returns. CAZ248-255>257-265-102245- /O.CON.KSGX.FW.W.0002.180211T0600Z-180211T2100Z/ 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- 331 AM PST Sat Feb 10 2018 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 PM THIS EVENING TO 1 PM PST SUNDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY... * WIND...Areas of north to northeast winds 20 to 30 mph with gusts to 50 mph. Isolated gusts to 65 mph in the Inland Empire below the Cajon Pass and along and near the coastal slopes of the Santa Ana mountains. * TIMING...The winds will develop late this evening...strengthen into Sunday morning...then diminish Sunday afternoon. * LOCATION...Strongest winds along lower coastal mountain slopes and below passes and canyons. * HUMIDITY...Falling to 15 to 20 percent late tonight...and 5 to 10 percent Sunday. * OUTLOOK...Winds will diminish Sunday afternoon and a return of onshore flow will bring a rapid recovery of humidities late Sunday night along with a slight chance of showers. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning should be avoided. The winds will make driving difficult...especially for motorists with high profile vehicles. Watch for broken tree limbs and other debris. 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
490 WWUS86 KSGX 102129 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 129 PM PST Sat Feb 10 2018 ...RED FLAG WARNING FOR THE MOUNTAINS OF ORANGE...SAN BERNARDINO...AND RIVERSIDE COUNTIES...THE INLAND EMPIRE...AND THE SAN GORGONIO PASS FOR LATE TONIGHT THROUGH EARLY SUNDAY AFTERNOON FOR STRONG GUSTY WINDS AND LOW HUMIDITY... CAZ248-255>257-265-110600- /O.CON.KSGX.FW.W.0002.180211T0600Z-180211T2100Z/ 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- 129 PM PST Sat Feb 10 2018 ...RED FLAG WARNING FOR THE MOUNTAINS OF ORANGE...SAN BERNARDINO...AND RIVERSIDE COUNTIES...THE INLAND EMPIRE...AND THE SAN GORGONIO PASS REMAINS IN EFFECT FROM 10 PM THIS EVENING TO 1 PM PST SUNDAY FOR STRONG GUSTY WINDS AND LOW HUMIDITY... * WIND...Areas of north to northeast winds 20 to 30 mph with gusts to 50 mph. Isolated gusts to 60 mph in the Inland Empire below the Cajon Pass and along and near the coastal slopes of the Santa Ana mountains. * TIMING...The winds will develop late this evening... strengthen into Sunday morning...then diminish Sunday afternoon. * LOCATION...Strongest winds along lower coastal mountain slopes and below passes and canyons. * HUMIDITY...Falling to 15 to 20 percent late tonight...and 5 to 10 percent Sunday. * OUTLOOK...Winds will diminish Sunday afternoon and a return of onshore flow will bring a rapid humidity recovery Sunday night. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning should be avoided. The winds will make driving difficult...especially for motorists with high profile vehicles. Watch for broken tree limbs and other debris. 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...can contribute to extreme fire behavior. && $$
552 WWUS86 KSGX 110548 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 948 PM PST Sat Feb 10 2018 ...RED FLAG WARNING FOR THE MOUNTAINS OF ORANGE...SAN BERNARDINO...AND RIVERSIDE COUNTIES...THE INLAND EMPIRE...AND THE SAN GORGONIO PASS THROUGH 1 PM SUNDAY... .Surface high pressure building over the Great Basin will bring a period of stronger and gusty north to northeast winds tonight through Sunday morning along with low humidities. Winds will diminish Sunday afternoon and humidities will recover rapidly late Sunday night as onshore flow returns. CAZ248-255>257-265-111400- /O.CON.KSGX.FW.W.0002.180211T0600Z-180211T2100Z/ 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- 948 PM PST Sat Feb 10 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 1 PM PST SUNDAY... * WIND...Areas of north to northeast winds 20 to 30 mph with gusts to 50 mph. Isolated gusts to 60 mph in the Inland Empire below the Cajon Pass and along and near the coastal slopes of the Santa Ana mountains. * TIMING...Tonight and through 1 PM Sunday. Winds diminishing Sunday afternoon. * LOCATION...Strongest winds along lower coastal mountain slopes and below passes and canyons. * HUMIDITY...Falling to 15 to 20 percent late tonight...and 5 to 10 percent Sunday. * OUTLOOK...Northeast winds will diminish Sunday afternoon and a return of onshore flow will bring a rapid humidity recovery Sunday night. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning should be avoided. The winds will make driving difficult...especially for motorists with high profile vehicles. Watch for broken tree limbs and other debris. 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...can contribute to extreme fire behavior. && $$ Moede
702 WWUS86 KSGX 111139 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 339 AM PST Sun Feb 11 2018 ...RED FLAG WARNING FOR THE MOUNTAINS OF ORANGE...SAN BERNARDINO...AND RIVERSIDE COUNTIES...THE INLAND EMPIRE...AND THE SAN GORGONIO PASS THROUGH 1 PM TODAY... .Moderate offshore flow will bring gusty north to northeast winds and low humidities through this morning along and near coastal mountain slopes of San Bernardino...Riverside...and Orange Counties with critical fire weather conditions. Onshore flow will return during the afternoon with humidities beginning to recover by late afternoon. Humidities will recover more rapidly tonight as onshore flow strengthens. CAZ248-255>257-265-112100- /O.CON.KSGX.FW.W.0002.000000T0000Z-180211T2100Z/ 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- 339 AM PST Sun Feb 11 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 1 PM PST THIS AFTERNOON FOR STRONG GUSTY WINDS AND LOW HUMIDITY... * WIND...Areas of north to northeast winds 20 to 30 mph with gusts to 45 mph. Isolated gusts to 55 mph in the Inland Empire below the Cajon Pass and along and near the coastal slopes of the Santa Ana mountains. * TIMING...Strongest winds from after sunrise through mid morning with with lowest humidities after mid morning. * LOCATION...Strongest winds along lower coastal mountain slopes and below passes and canyons. * HUMIDITY...Falling to 15 to 25 percent around sunrise...and around 10 percent by late morning. * OUTLOOK...Northeast winds will diminish by early this afternoon. Weak onshore flow will develop during afternoon with humidities beginning to recover by late afternoon. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning should be avoided. The winds will make driving difficult...especially for motorists with high profile vehicles. Watch for broken tree limbs and other debris. 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...can contribute to extreme fire behavior. && $$ 17
347 WWUS86 KSGX 112053 RFWSGX URGENT - FIRE WEATHER MESSAGE National Weather Service San Diego CA 1253 PM PST Sun Feb 11 2018 CAZ248-255>257-265-112200- /O.EXP.KSGX.FW.W.0002.000000T0000Z-180211T2100Z/ 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- 1253 PM PST Sun Feb 11 2018 ...RED FLAG WARNING WILL EXPIRE AT 1 PM PST THIS AFTERNOON FOR STRONG GUSTY WINDS AND LOW HUMIDITY... Reporting stations across the forecast area are no longer reporting critical fire weather conditions. Relative humidity will remain low through late afternoon, but winds will continue to subside. A Wind Advisory has been issued for the San Bernardino Mts and high desert areas for later this evening due to increasing south winds, which will bring much higher humidity overnight. $$ jad
Nearby
Red Flag Warnings in California, 2018Every red flag warning in 2018
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.