Alert archive / California / Red Flag Warnings in 2017
Red Flag Warning 9, NWS Phoenix, AZ
NWS Phoenix, AZ issued this red flag warning at Dec 14, 2017, 1:41 AM PST for Imperial County, Riverside County, San Bernardino County, California; La Paz County, Yuma County, Arizona. It took effect at Dec 14, 2017, 8:00 AM PST. It was in force for 8 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
- Dec 14, 2017, 1:41 AM PST (09:41 UTC)
- In effect from
- Dec 14, 2017, 8:00 AM PST
- Expired
- Dec 14, 2017, 4:00 PM PST
- In force
- 8 hr
- Issued by
- NWS Phoenix, AZ
Counties La Paz County, AZ, Yuma County, AZ, Imperial County, CA, Riverside County, CA, San Bernardino County, CA
The radar
The Yuma radar (KYUX), 132 km from the middle of the area, began a volume at 09:40 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 00:00Z, 9.7 hours before the alert went out and 217 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
- 5029 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 76 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
288 WWUS85 KPSR 140941 RFWPSR URGENT - FIRE WEATHER MESSAGE National Weather Service Phoenix AZ 241 AM MST Thu Dec 14 2017 CAZ230-232-142200- /O.NEW.KPSR.FW.W.0009.171214T1600Z-171215T0000Z/ Joshua Tree National Park- Imperial County And Eastern Riverside County- 141 AM PST Thu Dec 14 2017 ...RED FLAG WARNING IN EFFECT FROM 8 AM THIS MORNING TO 4 PM PST THIS AFTERNOON FOR STRONG WINDS, LOW RELATIVE HUMIDITY AND VERY HIGH TO EXTREME FIRE DANGER FOR SOUTHEAST CALIFORNIA... The National Weather Service in Phoenix has issued a Red Flag Warning for strong winds, low relative humidity and very high to extreme fire danger, which is in effect from 8 AM this morning to 4 PM PST this afternoon. * AFFECTED AREA...Joshua Tree National Park, eastern Riverside County and portions of Imperial County. * WINDS...North 20 to 30 mph with gusts up to 45 mph. * TIMING...Today from mid-morning through late afternoon. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...Fuels are very dry and fire danger is very high to extreme. These conditions combined with low relative humidity and strong winds will lead to widespread hazardous fire weather conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Please advise the appropriate officials and fire crews in the field of this red flag warning. && $$ AZZ131-CAZ231-142200- /O.NEW.KPSR.FW.W.0009.171214T1800Z-171215T0000Z/ Yuma/Martinez Lake and Vicinity/Lower Colorado River Valley AZ- Lower Colorado River Valley CA- 241 AM MST Thu Dec 14 2017 /141 AM PST Thu Dec 14 2017/ ...RED FLAG WARNING IN EFFECT FROM 11 AM MST /10 AM PST/ THIS MORNING TO 5 PM MST /4 PM PST/ THIS AFTERNOON FOR STRONG WINDS, LOW RELATIVE HUMIDITY AND VERY HIGH TO EXTREME FIRE DANGER FOR THE LOWER COLORADO RIVER VALLEY... The National Weather Service in Phoenix has issued a Red Flag Warning for strong winds, low relative humidity and very high to extreme fire danger, which is in effect from 11 AM MST /10 AM PST/ this morning to 5 PM MST /4 PM PST/ this afternoon. * AFFECTED AREA...Yuma/Martinez Lake and Vicinity/Lower Colorado River Valley AZ and Lower Colorado River Valley CA. * WINDS...North 20 to 30 mph with gusts up to 45 mph. * TIMING...Today from mid-morning through late afternoon. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Fuels are very dry and fire danger is very high to extreme. These conditions combined with low relative humidity and strong winds will lead to widespread hazardous fire weather conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Please advise the appropriate officials and fire crews in the field of this red flag warning. && $$ National Weather Service Phoenix is on the internet at weather.gov/phoenix
2 follow-up statements
790 WWUS85 KPSR 142058 RFWPSR URGENT - FIRE WEATHER MESSAGE National Weather Service Phoenix AZ 158 PM MST Thu Dec 14 2017 CAZ230-232-150000- /O.CON.KPSR.FW.W.0009.000000T0000Z-171215T0000Z/ Joshua Tree National Park- Imperial County And Eastern Riverside County- 1258 PM PST Thu Dec 14 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 4 PM PST THIS AFTERNOON FOR STRONG WINDS, LOW RELATIVE HUMIDITY AND VERY HIGH TO EXTREME FIRE DANGER FOR SOUTHEAST CALIFORNIA... * AFFECTED AREA...Joshua Tree National Park and Imperial County And Eastern Riverside County. * WINDS...North 20 to 30 mph with gusts up to 45 mph. * TIMING...Today from mid-morning through late afternoon. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...Fuels are very dry and fire danger is very high to extreme. These conditions combined with low relative humidity and strong winds will lead to widespread hazardous fire weather conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Please advise the appropriate officials and fire crews in the field of this red flag warning. && $$ AZZ131-CAZ231-150000- /O.CON.KPSR.FW.W.0009.000000T0000Z-171215T0000Z/ Yuma/Martinez Lake and Vicinity/Lower Colorado River Valley AZ- Lower Colorado River Valley CA- 158 PM MST Thu Dec 14 2017 /1258 PM PST Thu Dec 14 2017/ ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM MST /4 PM PST/ THIS AFTERNOON FOR STRONG WINDS, LOW RELATIVE HUMIDITY AND VERY HIGH TO EXTREME FIRE DANGER FOR THE LOWER COLORADO RIVER VALLEY... * AFFECTED AREA...Yuma/Martinez Lake and Vicinity/Lower Colorado River Valley AZ and Lower Colorado River Valley CA. * WINDS...North 15 to 25 mph with gusts up to 40 mph. * TIMING...Today from mid-morning through late afternoon. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Fuels are very dry and fire danger is very high to extreme. These conditions combined with low relative humidity and strong winds will lead to widespread hazardous fire weather conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Please advise the appropriate officials and fire crews in the field of this red flag warning. && $$ National Weather Service Phoenix is on the internet at weather.gov/phoenix
955 WWUS85 KPSR 150013 RFWPSR URGENT - FIRE WEATHER MESSAGE National Weather Service Phoenix AZ 513 PM MST Thu Dec 14 2017 AZZ131-CAZ230>232-150115- /O.EXP.KPSR.FW.W.0009.000000T0000Z-171215T0000Z/ Yuma/Martinez Lake and Vicinity/Lower Colorado River Valley AZ- Joshua Tree National Park-Lower Colorado River Valley CA- Imperial County And Eastern Riverside County- 513 PM MST Thu Dec 14 2017 /413 PM PST Thu Dec 14 2017/ ...RED FLAG WARNING HAS EXPIRED FOR STRONG WINDS, LOW RELATIVE HUMIDITY AND VERY HIGH FIRE DANGER FOR SOUTHEAST CALIFORNIA... Winds have now dropped below criteria this evening allowing the warning to expire. $$ National Weather Service Phoenix is on the internet at weather.gov/phoenix
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 14, 1:29 AM PST | Wind Advisory | PSR | Imperial, Riverside, San Bernardino | 15 hr |
Nearby
Red Flag Warnings in California, 2017Red Flag Warnings in Arizona, 2017Every red flag warning in 2017
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.