Alert archive / Washington / Red Flag Warnings in 2021
Red Flag Warning 2, NWS Seattle, WA
NWS Seattle, WA issued this red flag warning at Aug 11, 2021, 1:52 PM PDT for 7 counties in Washington. It took effect at Aug 12, 2021, 10:00 AM PDT. It was in force for 36 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
- Aug 11, 2021, 1:52 PM PDT (20:52 UTC)
- In effect from
- Aug 12, 2021, 10:00 AM PDT
- Expired
- Aug 13, 2021, 10:00 PM PDT
- In force
- 36 hr
- Issued by
- NWS Seattle, WA
Counties King County, WA, Lewis County, WA, Pierce County, WA, Skagit County, WA, Skamania County, WA, Snohomish County, WA, Whatcom County, WA
The radar
The Seattle radar (KATX), 87 km from the middle of the area, began a volume at 20:54 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
Quillayute State, WA (KUIL), launched 12:00Z, 8.9 hours before the alert went out and 197 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
- 1766 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 19 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
898 WWUS86 KSEW 112052 RFWSEW URGENT - FIRE WEATHER MESSAGE National Weather Service Seattle WA 152 PM PDT Wed Aug 11 2021 WAZ658-659-120500- /O.UPG.KSEW.FW.A.0001.210812T1800Z-210813T0600Z/ /O.NEW.KSEW.FW.W.0002.210812T1800Z-210814T0500Z/ West Slopes of the North Cascades Generally above 1500 Feet- West Slopes of the Central Cascades Generally above 1500 Feet- 152 PM PDT Wed Aug 11 2021 ...RED FLAG WARNING IN EFFECT FROM 11 AM THURSDAY TO 10 PM PDT FRIDAY FOR HOT, DRY AND UNSTABLE CONDITIONS FOR FIRE WEATHER ZONES 658 AND 659... The National Weather Service in Seattle has upgraded the Fire Weather Watch to a Red Flag Warning for hot, dry and unstable conditions, which is in effect from 11 AM Thursday to 10 PM PDT Friday. * AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North Cascades Generally above 1500 Feet and Fire Weather Zone 659 West Slopes of the Central Cascades Generally above 1500 Feet. * RELATIVE HUMIDITY...As low as 20 percent during the daytime hours. Modest overnight recoveries are possible below around 2500 feet which will provide a brief break in the period of However, the higher slopes will experience very poor recovery. * TEMPERATURES...In the upper 70s to lower 80s. * HAINES...6. * IMPACTS...A dry and very unstable air mass with warm temperatures can contribute to active fire behavior. In western Washington, significant growth on existing fires takes place under such conditions. If a fire were to begin, air quality may diminish in the surrounding area. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either imminent or occurring now. Any fires that develop will likely spread quickly. Outdoor burning is not recommended. && $$
8 follow-up statements
543 WWUS86 KSEW 112241 RFWSEW URGENT - FIRE WEATHER MESSAGE National Weather Service Seattle WA 341 PM PDT Wed Aug 11 2021 WAZ658-659-120645- /O.CON.KSEW.FW.W.0002.210812T1800Z-210814T0500Z/ West Slopes of the North Cascades Generally above 1500 Feet- West Slopes of the Central Cascades Generally above 1500 Feet- 341 PM PDT Wed Aug 11 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THURSDAY TO 10 PM PDT FRIDAY FOR HOT, DRY AND UNSTABLE CONDITIONS FOR FIRE WEATHER ZONES 658 AND 659... * AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North Cascades Generally above 1500 Feet and Fire Weather Zone 659 West Slopes of the Central Cascades Generally above 1500 Feet. * RELATIVE HUMIDITY...As low as 20 percent during the daytime hours. Modest overnight recoveries are possible below around 2500 feet which will provide a brief break in the period of concern. However, the higher slopes will experience very poor recovery. * TEMPERATURES...In the upper 70s to lower 80s. * HAINES...6. * IMPACTS...A dry and very unstable air mass with warm temperatures can contribute to active fire behavior. In western Washington, significant growth on existing fires takes place under such conditions. If a fire were to begin, air quality may diminish in the surrounding area. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either imminent or occurring now. Any fires that develop will likely spread quickly. Outdoor burning is not recommended. && $$
620 WWUS86 KSEW 120548 RFWSEW URGENT - FIRE WEATHER MESSAGE National Weather Service Seattle WA 1048 PM PDT Wed Aug 11 2021 WAZ658-659-121400- /O.CON.KSEW.FW.W.0002.210812T1800Z-210814T0500Z/ West Slopes of the North Cascades Generally above 1500 Feet- West Slopes of the Central Cascades Generally above 1500 Feet- 1048 PM PDT Wed Aug 11 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THURSDAY TO 10 PM PDT FRIDAY FOR HOT, DRY AND UNSTABLE CONDITIONS FOR FIRE WEATHER ZONES 658 AND 659... * AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North Cascades Generally above 1500 Feet and Fire Weather Zone 659 West Slopes of the Central Cascades Generally above 1500 Feet. * RELATIVE HUMIDITY...As low as 22 percent. * TEMPERATURES...In the upper 70s. * HAINES...6. * IMPACTS...A dry and very unstable air mass with warm temperatures can contribute to active fire behavior. In western Washington, significant growth on existing fires takes place under such conditions. If a fire were to begin, air quality may diminish in the surrounding area. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either imminent or occurring now. Any fires that develop will likely spread quickly. Outdoor burning is not recommended. && $$
184 WWUS86 KSEW 121129 RFWSEW URGENT - FIRE WEATHER MESSAGE National Weather Service Seattle WA 429 AM PDT Thu Aug 12 2021 WAZ658-659-130000- /O.CON.KSEW.FW.W.0002.210812T1800Z-210814T0500Z/ West Slopes of the North Cascades Generally above 1500 Feet- West Slopes of the Central Cascades Generally above 1500 Feet- 429 AM PDT Thu Aug 12 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 10 PM PDT FRIDAY FOR HOT, DRY AND UNSTABLE CONDITIONS FOR FIRE WEATHER ZONES 658 AND 659... * AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North Cascades Generally above 1500 Feet and Fire Weather Zone 659 West Slopes of the Central Cascades Generally above 1500 Feet. * RELATIVE HUMIDITY...As low as 20 percent during the daytime hours. Modest overnight recoveries are possible below around 2500 feet which will provide a brief break in the period of concern. However, the higher slopes will experience very poor recovery. * TEMPERATURES...In the upper 70s to lower 80s. * HAINES...6. * IMPACTS...A dry and very unstable air mass with warm temperatures can contribute to active fire behavior. In western Washington, significant growth on existing fires takes place under such conditions. If a fire were to begin, air quality may diminish in the surrounding area. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either imminent or occurring now. Any fires that develop will likely spread quickly. Outdoor burning is not recommended. && $$
309 WWUS86 KSEW 121700 RFWSEW URGENT - FIRE WEATHER MESSAGE National Weather Service Seattle WA 1000 AM PDT Thu Aug 12 2021 WAZ656-130100- /O.EXB.KSEW.FW.W.0002.210812T1700Z-210814T0200Z/ Northeast Puget Sound Lowlands Generally Below 1500 Feet- 1000 AM PDT Thu Aug 12 2021 ...RED FLAG WARNING IN EFFECT UNTIL 7 PM PDT FRIDAY FOR HOT DRY AND WINDY CONDITIONS FOR FIRE WEATHER ZONE 656... The National Weather Service in Seattle has issued a Red Flag Warning for hot dry and windy conditions which is in effect until 7 PM PDT Friday. * AFFECTED AREA...Fire Weather Zone 656 Northeast Puget Sound Lowlands Generally Below 1500 Feet. * WINDS...Northeast 10 to 20 mph with gusts to 30 mph in the Lynden and Sumas area due to northeast winds coming down the Fraser. * RELATIVE HUMIDITY...As low as 20 percent. * TEMPERATURES...Highs 90 to 95. * TIMING...Through mid afternoon then easing. * HAINES...6. * IMPACTS...A dry and very unstable air mass with warm temperatures can contribute to active fire behavior. In western Washington, significant growth on existing fires takes place under such conditions. If a fire were to begin, air quality may diminish in the surrounding area. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either imminent or occurring now. Any fires that develop will likely spread quickly. Outdoor burning is not recommended. && $$ WAZ658-659-130100- /O.CON.KSEW.FW.W.0002.210812T1800Z-210814T0500Z/ West Slopes of the North Cascades Generally above 1500 Feet- West Slopes of the Central Cascades Generally above 1500 Feet- 1000 AM PDT Thu Aug 12 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PDT FRIDAY FOR HOT, DRY AND UNSTABLE CONDITIONS FOR FIRE WEATHER ZONES 658 AND 659... * AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North Cascades Generally above 1500 Feet and Fire Weather Zone 659 West Slopes of the Central Cascades Generally above 1500 Feet. * RELATIVE HUMIDITY...As low as 20 percent during the daytime hours. Modest overnight recoveries are possible below around 2500 feet which will provide a brief break in the period of concern. However, the higher slopes will experience very poor recovery. * TEMPERATURES...In the upper 70s and 80s. * HAINES...6. * IMPACTS...A dry and very unstable air mass with warm temperatures can contribute to active fire behavior. In western Washington, significant growth on existing fires takes place under such conditions. If a fire were to begin, air quality may diminish in the surrounding area. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either imminent or occurring now. Any fires that develop will likely spread quickly. Outdoor burning is not recommended. && $$
350 WWUS86 KSEW 122129 RFWSEW URGENT - FIRE WEATHER MESSAGE National Weather Service Seattle WA 229 PM PDT Thu Aug 12 2021 WAZ658-659-130530- /O.CON.KSEW.FW.W.0002.000000T0000Z-210814T0500Z/ West Slopes of the North Cascades Generally above 1500 Feet- West Slopes of the Central Cascades Generally above 1500 Feet- 229 PM PDT Thu Aug 12 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PDT FRIDAY FOR HOT, DRY AND UNSTABLE CONDITIONS FOR FIRE WEATHER ZONES 658 AND 659... * AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North Cascades Generally above 1500 Feet and Fire Weather Zone 659 West Slopes of the Central Cascades Generally above 1500 Feet. * RELATIVE HUMIDITY...As low as 25 percent. * TEMPERATURES...In the upper 70s and 80s except 90s lowest elevations. * HAINES...6. * IMPACTS...A dry and very unstable air mass with warm temperatures can contribute to active fire behavior. In western Washington, significant growth on existing fires takes place under such conditions. If a fire were to begin, air quality may diminish in the surrounding area. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either imminent or occurring now. Any fires that develop will likely spread quickly. Outdoor burning is not recommended. && $$ WAZ656-130530- /O.CON.KSEW.FW.W.0002.000000T0000Z-210814T0200Z/ Northeast Puget Sound Lowlands Generally Below 1500 Feet- 229 PM PDT Thu Aug 12 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM PDT FRIDAY FOR HOT DRY AND WINDY CONDITIONS FOR FIRE WEATHER ZONE 656... * AFFECTED AREA...Fire Weather Zone 656 Northeast Puget Sound Lowlands Generally Below 1500 Feet. * WINDS...Northeast 10 to 20 mph becomign northwest 5 to 10 mph. * RELATIVE HUMIDITY...As low as 25 percent. * TEMPERATURES...Highs in the mid and upper 90s away from the water this afternoon. * HAINES...6. * IMPACTS...A dry and very unstable air mass with warm temperatures can contribute to active fire behavior. In western Washington, significant growth on existing fires takes place under such conditions. If a fire were to begin, air quality may diminish in the surrounding area. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either imminent or occurring now. Any fires that develop will likely spread quickly. Outdoor burning is not recommended. && $$
784 WWUS86 KSEW 130332 RFWSEW URGENT - FIRE WEATHER MESSAGE National Weather Service Seattle WA 832 PM PDT Thu Aug 12 2021 WAZ658-659-131230- /O.CON.KSEW.FW.W.0002.000000T0000Z-210814T0500Z/ West Slopes of the North Cascades Generally above 1500 Feet- West Slopes of the Central Cascades Generally above 1500 Feet- 832 PM PDT Thu Aug 12 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PDT FRIDAY FOR HOT, DRY AND VERY UNSTABLE CONDITIONS FOR FIRE WEATHER ZONES 658 AND 659... * AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North Cascades Generally above 1500 Feet and Fire Weather Zone 659 West Slopes of the Central Cascades Generally above 1500 Feet. * RELATIVE HUMIDITY...As low as 20 percent. Poor recovery is expected tonight above around 2,500 feet, while lower elevations may experiences moderate recoveries. * TEMPERATURES...In the upper 70s to 80s * HAINES...6. * IMPACTS...A dry and very unstable air mass with warm temperatures can contribute to active fire behavior. In western Washington, significant growth on existing fires takes place under such conditions. If a fire were to begin, air quality may diminish in the surrounding area. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either imminent or occurring now. Any fires that develop will likely spread quickly. Outdoor burning is not recommended. && $$ WAZ656-131230- /O.CON.KSEW.FW.W.0002.000000T0000Z-210814T0200Z/ Northeast Puget Sound Lowlands Generally Below 1500 Feet- 832 PM PDT Thu Aug 12 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM PDT FRIDAY FOR HOT DRY AND WINDY CONDITIONS FOR FIRE WEATHER ZONE 656... * AFFECTED AREA...Fire Weather Zone 656 Northeast Puget Sound Lowlands Generally Below 1500 Feet. * WINDS...Northeast 10 to 20 mph, easing Friday and becoming northwest late Friday afternoon. * RELATIVE HUMIDITY...Daytime RHs as low 20 to 25 percent, though poor to moderate recoveries expected overnight. * TEMPERATURES...Highs in the upper 80s to 90s away from the water. * HAINES...6. * IMPACTS...A dry and very unstable air mass with warm temperatures can contribute to active fire behavior. In western Washington, significant growth on existing fires takes place under such conditions. If a fire were to begin, air quality may diminish in the surrounding area. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either imminent or occurring now. Any fires that develop will likely spread quickly. Outdoor burning is not recommended. && $$
963 WWUS86 KSEW 131033 RFWSEW URGENT - FIRE WEATHER MESSAGE National Weather Service Seattle WA 333 AM PDT Fri Aug 13 2021 WAZ656-131145- /O.CAN.KSEW.FW.W.0002.000000T0000Z-210814T0200Z/ Northeast Puget Sound Lowlands Generally Below 1500 Feet- 333 AM PDT Fri Aug 13 2021 ...RED FLAG WARNING IS CANCELLED FOR HOT DRY AND WINDY CONDITIONS FOR FIRE WEATHER ZONE 656... The National Weather Service in Seattle has cancelled the Red Flag Warning. While isolated or short instances may occur during the day today, winds and RH values are expected to generally remain outside of critical thresholds. As such, the red flag warning has been cancelled. $$ WAZ658-659-131845- /O.CON.KSEW.FW.W.0002.000000T0000Z-210814T0500Z/ West Slopes of the North Cascades Generally above 1500 Feet- West Slopes of the Central Cascades Generally above 1500 Feet- 333 AM PDT Fri Aug 13 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PDT THIS EVENING FOR HOT, DRY AND VERY UNSTABLE CONDITIONS FOR FIRE WEATHER ZONES 658 AND 659... * AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North Cascades Generally above 1500 Feet and Fire Weather Zone 659 West Slopes of the Central Cascades Generally above 1500 Feet. * RELATIVE HUMIDITY...As low as 22 percent. * TEMPERATURES...In the upper 70s to 80s. * HAINES...6. * IMPACTS...A dry and very unstable air mass with warm temperatures can contribute to active fire behavior. In western Washington, significant growth on existing fires takes place under such conditions. If a fire were to begin, air quality may diminish in the surrounding area. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either imminent or occurring now. Any fires that develop will likely spread quickly. Outdoor burning is not recommended. && $$
233 WWUS86 KSEW 131850 RFWSEW URGENT - FIRE WEATHER MESSAGE National Weather Service Seattle WA 1150 AM PDT Fri Aug 13 2021 WAZ658-659-140500- /O.CON.KSEW.FW.W.0002.000000T0000Z-210814T0500Z/ West Slopes of the North Cascades Generally above 1500 Feet- West Slopes of the Central Cascades Generally above 1500 Feet- 1150 AM PDT Fri Aug 13 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM PDT THIS EVENING FOR HOT, DRY AND VERY UNSTABLE CONDITIONS FOR FIRE WEATHER ZONES 658 AND 659... * AFFECTED AREA...Fire Weather Zone 658 West Slopes of the North Cascades Generally above 1500 Feet and Fire Weather Zone 659 West Slopes of the Central Cascades Generally above 1500 Feet. * RELATIVE HUMIDITY...As low as 22 percent. * TEMPERATURES...In the upper 70s and 80s with 90s in the lowest elevations. * HAINES...6. * IMPACTS...A dry and very unstable air mass with warm temperatures can contribute to active fire behavior. In western Washington, significant growth on existing fires takes place under such conditions. If a fire were to begin, air quality may diminish in the surrounding area. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either imminent or occurring now. Any fires that develop will likely spread quickly. Outdoor burning is not recommended. && $$
The office that day
Everything else NWS Seattle, WA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 4:34 AM PDT | Fire Weather Watch | SEW | King, Lewis, Pierce, Skagit, Skamania, Snohomish and 1 more | 9 hr |
Nearby
Red Flag Warnings in Washington, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.