602
FNUS76 KOTX 292307
FWSOTX

Spot Forecast for Ptarmagin...USFS
National Weather Service Spokane WA
407 PM PDT Wed Jul 29 2026

Forecast is based on forecast start time of 0600 PDT on July 30.

...FIRE WEATHER WATCH IN EFFECT FROM SATURDAY MORNING THROUGH
SATURDAY EVENING...

.DISCUSSION...

Warm and dry conditions persist over the fire today and Thursday,
with high temperatures in the upper 60s and 70s and minimum
relative humidity values dropping into the upper 20s to mid 30s.
Winds will be light out of the southwest Thursday and Friday.
Overnight relative humidity recoveries will be good.

If conditions become unrepresentative, contact the National Weather
Service.
***************************************************************
Forecasts for 20 foot wind speeds (valleys and ridge tops) are
10 minute averages reflecting RAWS wind.
***Ventilation Index is derived from transport wind
   multiplied by the mixing height divided by 100.
   Categories: low (< 200), moderate (200-500),
   high (500-800), and very high (> 800).
***************************************************************

.THURSDAY...

Sky/weather.........Sunny. Areas of smoke.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....65-71.
Min humidity........28-33 percent.
Wind (20 ft)........Southwest winds 1 to 4 mph increasing to 5
                    to 8 mph after 1300.
Mixing height.......Inversion lifting around 0830. Mixing height
                    increasing to 5000 ft AGL in the afternoon.
Transport winds.....Southwest 9 to 13 mph.
Ventilation Index...Moderate (290) increasing to moderate (498) in
                    the afternoon.

.THURSDAY NIGHT...

Sky/weather.........Mostly clear. Areas of smoke.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....42-46.
Max humidity........72-77 percent.
Wind (20 ft)........Southwest winds 5 to 8 mph in the evening
                    decreasing to 1 to 4 mph after 2000.
Mixing height.......Falling to 500 ft AGL around 2100.
Transport winds.....Southwest 7 to 10 mph.
Ventilation Index...Moderate (336) decreasing to low (22)
                    overnight.

.FRIDAY...

Sky/weather.........Sunny. Areas of smoke.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....71-77.
Min humidity........30-35 percent.
Wind (20 ft)........Southwest 1 to 4 mph.
Mixing height.......Inversion lifting around 0830. Mixing height
                    increasing to 6500 ft AGL in the afternoon.
Transport winds.....Southwest 8 to 13 mph.
Ventilation Index...Moderate (312) increasing to high (774) in the
                    afternoon.

$$
Forecaster...RFKS
Requested by...Aana Kulaas
Type of request...WILDFIRE
.TAG 2618247.4/OTX
.DELDT 07/29/26
.FormatterVersion 2.0.0
.EMAIL keith_kistler@firenet.gov,aana_kulaas@firenet.gov