FNUS76 KSEW 232258
FWSSEW

Spot Forecast for Backbone fire...IIMT-AUS/NZ IMT #3
National Weather Service Seattle WA
358 PM PDT Sun Aug 23 2026

Forecast is based on forecast start time of 1500 PDT on August 24. 
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.

.DISCUSSION...Dry conditions are in the forecast throughout the
period. Low-level onshore flow will switch offshore on Monday as
an upper-level ridge builds into the region in concert with a
surface thermal trough. As a result, warmer temperatures and near-
critical min RHs are possible across the incident area on both
Monday and Tuesday.

.MONDAY...

Sky/weather.........Sunny (15-25 percent). Patchy smoke. 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....Around 88. 
Min humidity........25 percent. 
Wind (20 ft)........Light winds. 
Mixing height.......5500 ft AGL. 
Transport winds.....South around 7 mph. 
Rainfall amount.....0.00 inches. 
Ceiling (KFT).......25. 
Visibility..........6. 

.MONDAY NIGHT...

Sky/weather.........Mostly clear (20-30 percent). Patchy smoke. 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Min temperature.....Around 61. 
Max humidity........53 percent. 
Wind (20 ft)........Light winds becoming northeast around 5 mph 
                    overnight. 
Mixing height.......400 ft AGL. 
Transport winds.....East around 6 mph. 
Rainfall amount.....0.00 inches. 
Ceiling (KFT).......25.
Visibility..........6. 

.TUESDAY...

Sky/weather.........Sunny (15-25 percent). 
CWR.................0 percent. 
Chance of lightning.1 percent. 
Max temperature.....Around 90. 
Min humidity........20 percent. 
Wind (20 ft)........Light winds becoming southeast around 5 mph in 
                    the afternoon. 
Mixing height.......6600 ft AGL. 
Transport winds.....Southeast around 8 mph. 
Rainfall amount.....0.00 inches. 
Ceiling (KFT).......25.
Visibility..........6 

$$
Forecaster...McMillian
Requested by...Situation Unit Leader
Type of request...WILDFIRE
.TAG 2619416.15/SEW
.DELDT 08/23/26
.FormatterVersion 2.0.0
.EMAIL Jordan_Jobson@firenet.gov