FNUS76 KSEW 222128
FWSSEW

Spot Forecast for Backbone fire...IIMT-AUS/NZ IMT #3
National Weather Service Seattle WA
228 PM PDT Sat Aug 22 2026

Forecast is based on forecast start time of 1500 PDT on August 22. 
If conditions become unrepresentative, contact the National Weather
Service.

Please contact our office at (206) 526-6095, if you have questions
or concerns with this forecast.

...RED FLAG WARNING IN EFFECT UNTIL 5 PM PDT THIS AFTERNOON...

.DISCUSSION...Showers and thunderstorms from earlier today have
since pushed off and away northward from the fire site. 
Conditions are slated to trend drier this afternoon however, a 
slight chance (15%) of lingering thunderstorms is possible. Low- 
level onshore flow as upper-level troughing remains throughout 
the period. Excellent RH recoveries are expected.


.REST OF TODAY...

Sky/weather.........Sunny (15-25 percent). 
CWR.................0 percent. 
Chance of lightning.13 percent. 
Max temperature.....Around 77. 
Min humidity........54 percent. 
Wind (20 ft)........Southwest winds around 5 to 10 mph. 
Mixing height.......3000 ft AGL. 
Transport winds.....Southwest around 12 mph. 
Rainfall amount.....0.00 inches. 
Ceiling (KFT).......25. 
Visibility..........10. 

.TONIGHT...

Sky/weather.........Partly cloudy (35-45 percent) then becoming 
                    mostly cloudy (75-85 percent). Slight chance of 
                    rain showers. 
CWR.................0 percent. 
Chance of lightning.5 percent. 
Min temperature.....Around 56. 
Max humidity........97 percent. 
Wind (20 ft)........Southwest winds 5 to 10 mph. 
Mixing height.......800 ft AGL. 
Transport winds.....Southwest around 10 mph. 
Rainfall amount.....0.00 inches. 
Ceiling (KFT).......11 decreasing to 5.5 overnight. 
Visibility..........10. 

.SUNDAY...

Sky/weather.........Mostly cloudy (75-85 percent) then becoming 
                    mostly sunny (35-45 percent). 
CWR.................0 percent. 
Chance of lightning.3 percent. 
Max temperature.....Around 73. 
Min humidity........57 percent. 
Wind (20 ft)........Southwest winds 5 to 10 mph. 
Mixing height.......3200 ft AGL. 
Transport winds.....West around 10 mph. 
Rainfall amount.....0.00 inches. 
Ceiling (KFT).......4.3 increasing to 25 in the afternoon. 
Visibility..........10. 

$$
Forecaster...McMillian
Requested by...Situation Unit Leader
Type of request...WILDFIRE
.TAG 2619416.13/SEW
.DELDT 08/22/26
.FormatterVersion 2.0.0
.EMAIL Jordan_Jobson@firenet.gov