552
FNUS76 KSEW 212217
FWSSEW

Spot Forecast for Luna Fire...SA-Gray Team
National Weather Service Seattle WA
317 PM PDT Fri Aug 21 2026

Forecast is based on forecast start time of 0600 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 FROM 5 AM TO 8 PM PDT SATURDAY...

.DISCUSSION...

.SATURDAY...An upper-low offshore is on track to to enter the
region early Saturday morning. As a result, scattered showers and
a 30-40% chance of thunderstorms will return to the incident area
sparking the issuance of a Red Flag Warning for the North Cascades
including the Luna Fire. The thunderstorm threat should wane
overnight Saturday into Sunday but precipitation is favorable to
remain. The best chance (20-25%) of wetting rain (>0.25") is in
the window between Saturday night Sunday morning.




Sky/weather.........Partly sunny (65-75 percent). Chance of showers
                    and slight chance of thunderstorms in the
                    morning, then showers and chance of
                    thunderstorms in the afternoon.
CWR.................15 percent.
Chance of lightning.35 to 40 percent.
Max temperature.....Around 76.
Min humidity........62 percent.
Wind (20 ft)........Light winds becoming southwest 5 to 10 mph in
                    the afternoon. Gusty and erratic winds expected
                    near thunderstorms.
Mixing height.......2300 ft AGL.
Transport winds.....Southwest around 10 mph.
Rainfall amount.....0.05 inches.
Ceiling (KFT).......25 decreasing to 5 to 10 in the afternoon.
Visibility..........10 decreasing to 6 in the afternoon.

.SATURDAY NIGHT...

Sky/weather.........Mostly cloudy (80-90 percent). Chance of
                    showers and thunderstorms in the evening, then
                    rain likely overnight.
CWR.................20 to 25 percent.
Chance of lightning.25 percent.
Min temperature.....Around 55.
Max humidity........81 percent.
Wind (20 ft)........Southwest winds 5 to 10 mph. Gusty and erratic
                    winds expected near thunderstorms in the
                    evening.
Mixing height.......900 ft AGL.
Transport winds.....Southwest around 10 mph.
Rainfall amount.....0.07 inches.
Ceiling (KFT).......5 to 10.
Visibility..........6.

.SUNDAY...

Sky/weather.........Partly sunny (65-75 percent). Rain likely in
                    the morning, then chance of rain in the
                    afternoon.
CWR.................15 percent.
Chance of lightning.10 percent.
Max temperature.....Around 66.
Min humidity........72 percent.
Wind (20 ft)........Southwest winds 5 to 10 mph.
Mixing height.......2400 ft AGL.
Transport winds.....Southwest around 10 mph.
Rainfall amount.....0.04 inches.
Ceiling (KFT).......5 to 10 rising to 10 to 15 in the afternoon.
Visibility..........6.

$$
Forecaster...McMillian
Requested by...Mark Huff PSC3
Type of request...WILDFIRE
.TAG 2618962.19/SEW
.DELDT 08/21/26
.FormatterVersion 2.0.0
.EMAIL mark_huff@firenet.gov,2026.luna.situation@firenet.gov