Alert archive / Washington / Red Flag Warnings in 2017
Red Flag Warning 4, NWS Seattle, WA
NWS Seattle, WA issued this red flag warning at Sep 3, 2017, 12:58 PM PDT for 11 counties in Washington. It took effect at Sep 3, 2017, 11:00 PM PDT. It was in force for 45 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
- Sep 3, 2017, 12:58 PM PDT (19:58 UTC)
- In effect from
- Sep 3, 2017, 11:00 PM PDT
- Expired
- Sep 5, 2017, 8:00 PM PDT
- In force
- 45 hr
- Issued by
- NWS Seattle, WA
Counties Clallam County, WA, Grays Harbor County, WA, Jefferson County, WA, King County, WA, Lewis County, WA, Mason County, WA, Pierce County, WA, Skagit County, WA, Skamania County, WA, Snohomish County, WA, Whatcom County, WA
The radar
The Seattle radar (KATX), 74 km from the middle of the area, began a volume at 20:01 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, 8.0 hours before the alert went out and 152 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
- 1582 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- -59 m²/s²
- 0-3 km storm-relative helicity
- 20 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
630 WWUS86 KSEW 031958 RFWSEW URGENT - FIRE WEATHER MESSAGE National Weather Service Seattle WA 1258 PM PDT Sun Sep 3 2017 WAZ650-041545- /O.UPG.KSEW.FW.A.0006.170904T1700Z-170905T2000Z/ /O.NEW.KSEW.FW.W.0004.170904T0600Z-170905T2000Z/ North Coastal Lowlands- 1258 PM PDT Sun Sep 3 2017 ...RED FLAG WARNING IN EFFECT FROM 11 PM THIS EVENING TO 1 PM PDT TUESDAY FOR WIND AND LOW HUMIDITY... The National Weather Service in Seattle has issued a Red Flag Warning, which is in effect from 11 PM this evening to 1 PM PDT Tuesday. The Fire Weather Watch is no longer in effect. * WIND...Moderate East-Northeast breezes of 10 to 15 mph with gusts around 20 to 25 mph are expected to develop tonight and last at times into Tuesday morning. Strongest wind will be at higher exposed locations such as Ellis Mountain. Lower elevations from the Sol Duc Basin northward could experience gusty winds and low RH during the day on Monday. * TEMPERATURES/HUMIDITY...Hot temperatures are forecast on Monday and Tuesday, with highs reaching the upper 80s. Relative humidity values of 20 to 35 percent are expected. Nighttime humidity recovery will be very poor tonight and Monday night above nighttime inversions. * IMPACTS...Outdoor burning is not recommended. Any new fires could spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of a moderate breeze, low relative humidity, and warm temperatures can contribute to rapid rates of spread and downwind spotting on new and existing fires. && $$ WAZ652-661-041545- /O.UPG.KSEW.FW.A.0006.170904T1400Z-170906T0400Z/ /O.NEW.KSEW.FW.W.0004.170904T1400Z-170906T0300Z/ West Portion of the Olympic Mountains- East Portion of the Olympic Mountains- 1258 PM PDT Sun Sep 3 2017 ...RED FLAG WARNING IN EFFECT FROM 7 AM MONDAY TO 8 PM PDT TUESDAY FOR A DRY AND UNSTABLE AIR MASS... The National Weather Service in Seattle has issued a Red Flag Warning, which is in effect from 7 AM Monday to 8 PM PDT Tuesday. The Fire Weather Watch is no longer in effect. * HAINES...Mid-Level Haines 6 conditions are forecast for Monday and Tuesday. This indicates a dry and unstable air mass. * TEMPERATURES/HUMIDITY...Relative humidity will drop below 25 percent on Monday and Tuesday, with very poor nighttime humidity recovery from tonight through Tuesday night. * IMPACTS...Outdoor burning is not recommended. Any new fires could spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A dry and unstable air mass with warm temperatures can contribute to active fire behavior. In western Washington, significant growth on existing fires takes place under such conditions. && $$ WAZ658-659-041545- /O.UPG.KSEW.FW.A.0006.170904T1900Z-170906T0400Z/ /O.NEW.KSEW.FW.W.0004.170904T1900Z-170906T0300Z/ West Slopes of the North Cascades Generally above 1500 Feet- West Slopes of the Central Cascades Generally above 1500 Feet- 1258 PM PDT Sun Sep 3 2017 ...RED FLAG WARNING IN EFFECT FROM NOON MONDAY TO 8 PM PDT TUESDAY FOR A DRY AND UNSTABLE AIR MASS ALONG WITH MODERATE EAST BREEZES... The National Weather Service in Seattle has issued a Red Flag Warning, which is in effect from noon Monday to 8 PM PDT Tuesday. The Fire Weather Watch is no longer in effect. * HAINES...Mid-Level Haines 6 conditions will develop on Monday and continue through Tuesday. This indicates a dry and unstable air mass. * TEMPERATURES/HUMIDITY...Hot afternoon temperatures are expected, and will be much above normal for this time of year. Relative humidity values will fall below 25 percent both Monday and Tuesday afternoons. Very poor nighttime humidity recovery is expected from tonight through Tuesday night. * WIND...East breezes of 10 to 15 mph with gusts around 25 to 30 mph are expected from Monday evening through Tuesday morning through the Cascades, especially from Glacier Peak area on south. * IMPACTS...Outdoor burning is not recommended. Any new fires could spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of a moderate breeze...low relative humidity...and warm temperatures can contribute to rapid rates of spread and downwind spotting on existing fires. A dry and unstable air mass with warm temperatures can contribute to active fire behavior. In western Washington, significant growth on new and existing fires takes place under such conditions. && $$ WAZ662-040300- /O.CON.KSEW.FW.W.0003.000000T0000Z-170904T0300Z/ East Portion of North Cascades National Park/Lake Chelan National Recreational Area- 1258 PM PDT Sun Sep 3 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PDT THIS EVENING FOR HOT...DRY AND UNSTABLE CONDITIONS FOR FIRE WEATHER ZONE 662... * HAINES...Mid- and High-Level Haines Index values of 5 to 6, indicating a dry and unstable air mass. * TEMPERATURES/HUMIDITY...High temperatures this afternoon will climb into the mid 90s in Stehekin, with Minimum Relative Humidity near 15 percent. * IMPACTS...These conditions will support active burning on new and existing fires. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are expected to occur. A dry and unstable air mass with warm temperatures can contribute to active fire behavior. Significant growth on new and existing fires takes place under such conditions. && $$ www.weather.gov/seattle
3 follow-up statements
201 WWUS86 KSEW 041529 RFWSEW URGENT - FIRE WEATHER MESSAGE National Weather Service Seattle WA 829 AM PDT Mon Sep 4 2017 WAZ652-661-042330- /O.CON.KSEW.FW.W.0004.000000T0000Z-170906T0300Z/ West Portion of the Olympic Mountains- East Portion of the Olympic Mountains- 829 AM PDT Mon Sep 4 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PDT TUESDAY FOR A DRY AND UNSTABLE AIR MASS... * HAINES...Mid-Level Haines 6 conditions are forecast for today and Tuesday. This indicates a dry and unstable air mass. * TEMPERATURES/HUMIDITY...Relative humidity will drop below 25 percent today and Tuesday, with very poor nighttime humidity recovery through Tuesday night. Temperatures will be much above normal for this time of year. * IMPACTS...Outdoor burning is not recommended. Any new fires could spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A dry and 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. && $$ WAZ650-042330- /O.CON.KSEW.FW.W.0004.000000T0000Z-170905T2000Z/ North Coastal Lowlands- 829 AM PDT Mon Sep 4 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 1 PM PDT TUESDAY FOR WIND AND LOW HUMIDITY... * WIND...Moderate East-Northeast breezes of 10 to 15 mph with gusts around 20 to 25 mph are expected to continue at times until Tuesday morning. Strongest wind will be at higher exposed locations such as Ellis Mountain. Lower elevations from the Sol Duc Basin northward could experience gusty winds and low RH this afternoon. * TEMPERATURES/HUMIDITY...Hot temperatures are expected today and Tuesday, with highs reaching the upper 80s and lower 90s. This is much above normal for this time of year. Relative humidity values of 20 to 35 percent are expected. Nighttime humidity recovery will be very poor tonight above low- lying nighttime inversions. * IMPACTS...Outdoor burning is not recommended. Any new fires could spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of a moderate breeze, low relative humidity, and warm temperatures can contribute to rapid rates of spread and downwind spotting on new and existing fires. && $$ WAZ658-659-042330- /O.CON.KSEW.FW.W.0004.170904T1900Z-170906T0300Z/ West Slopes of the North Cascades Generally above 1500 Feet- West Slopes of the Central Cascades Generally above 1500 Feet- 829 AM PDT Mon Sep 4 2017 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 8 PM PDT TUESDAY FOR A DRY AND UNSTABLE AIR MASS ALONG WITH MODERATE EAST BREEZES... * HAINES...Mid-Level Haines 6 conditions will develop today and continue through Tuesday. This indicates a dry and unstable air mass. * TEMPERATURES/HUMIDITY...Hot afternoon temperatures are expected, and will be much above normal for this time of year. Relative humidity values will fall below 25 percent both Monday and Tuesday afternoons. Very poor nighttime humidity recovery is expected from tonight through Tuesday night. * WIND...East breezes of 10 to 15 mph with gusts around 25 to 30 mph are expected from Monday evening through Tuesday morning through the Cascades, especially from Glacier Peak area on south. * IMPACTS...Outdoor burning is not recommended. Any new fires could spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of a moderate breeze...low relative humidity...and warm temperatures can contribute to rapid rates of spread and downwind spotting on existing fires. A dry and unstable air mass with warm temperatures can contribute to active fire behavior. In western Washington, significant growth on new and existing fires takes place under such conditions. && $$ www.weather.gov/seattle
228 WWUS86 KSEW 042246 RFWSEW URGENT - FIRE WEATHER MESSAGE National Weather Service Seattle WA 346 PM PDT Mon Sep 4 2017 WAZ652-658-659-661-051600- /O.CON.KSEW.FW.W.0004.000000T0000Z-170906T0300Z/ West Portion of the Olympic Mountains- West Slopes of the North Cascades Generally above 1500 Feet- West Slopes of the Central Cascades Generally above 1500 Feet- East Portion of the Olympic Mountains- 346 PM PDT Mon Sep 4 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PDT TUESDAY FOR A DRY AND UNSTABLE AIR MASS... * HAINES...Mid-Level Haines 6 conditions are forecast through Tuesday. This indicates a dry and unstable air mass. * TEMPERATURES/HUMIDITY...Relative humidity will drop below 25 percent Tuesday, with very poor nighttime humidity recovery through Tuesday night. Temperatures will be much above normal for this time of year. * WIND...East winds gusting around 20 to 30 mph are possible tonight and Tuesday morning in east-wind prone locations. This includes higher elevations of the northwest Olympic Peninsula as well as the Cascades from the Glacier Peak area southward. * IMPACTS...Outdoor burning is not recommended. Any new fires could spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A dry and unstable air mass with warm temperatures can contribute to active fire behavior. In western Washington, significant growth on existing fires takes place under such conditions. && $$ WAZ650-051600- /O.CON.KSEW.FW.W.0004.000000T0000Z-170905T2000Z/ North Coastal Lowlands- 346 PM PDT Mon Sep 4 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 1 PM PDT TUESDAY FOR WIND AND LOW HUMIDITY... * WIND...Moderate East-Northeast breezes of 10 to 15 mph with gusts around 20 to 30 mph are expected to continue at times until Tuesday morning. Strongest wind will be at higher exposed locations such as Ellis Mountain. * TEMPERATURES/HUMIDITY...Hot temperatures are expected again on Tuesday, with highs reaching the upper 80s and lower 90s. This is much above normal for this time of year. Relative humidity values of 25 to 35 percent are expected. Nighttime humidity recovery will be very poor tonight above low-lying nighttime inversions. * IMPACTS...Outdoor burning is not recommended. Any new fires could spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of a moderate breeze, low relative humidity, and warm temperatures can contribute to rapid rates of spread and downwind spotting on new and existing fires. && $$ www.weather.gov/seattle
133 WWUS86 KSEW 052005 RFWSEW URGENT - FIRE WEATHER MESSAGE National Weather Service Seattle WA 105 PM PDT Tue Sep 5 2017 WAZ650-052115- /O.EXP.KSEW.FW.W.0004.000000T0000Z-170905T2000Z/ North Coastal Lowlands- 105 PM PDT Tue Sep 5 2017 ...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW HUMIDITY OVER THE NORTHWEST OLYMPIC PENINSULA... Winds have eased across the northwest Olympic Peninsula. $$ WAZ652-658-659-661-060300- /O.CON.KSEW.FW.W.0004.000000T0000Z-170906T0300Z/ West Portion of the Olympic Mountains- West Slopes of the North Cascades Generally above 1500 Feet- West Slopes of the Central Cascades Generally above 1500 Feet- East Portion of the Olympic Mountains- 105 PM PDT Tue Sep 5 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM PDT THIS EVENING FOR A DRY AND UNSTABLE AIR MASS... * HAINES...Mid-Level Haines 6 conditions are forecast through today. This indicates a dry and unstable air mass. * TEMPERATURES/HUMIDITY...Relative humidity below 25 percent with very poor nighttime humidity recovery again tonight. Temperatures will be much above normal for this time of year. * WIND...East winds gusting around 20 to 30 mph are possible through this evening in east-wind prone locations. This includes the Cascades from the Glacier Peak area southward. * IMPACTS...Outdoor burning is not recommended. Any new or existing fires could spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A dry and 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. && $$ www.weather.gov/seattle
The office that day
Everything else NWS Seattle, WA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 3, 2:46 AM PDT | Small Craft Advisory | SEW | 20 hr | |
| Sep 3, 2:31 PM PDT | Heat Advisory | SEW | 55 hr |
Nearby
Red Flag Warnings in Washington, 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.