FNUS76 KOTX 220422
FWSOTX

Spot Forecast for Jameson Lake...BLM
National Weather Service Spokane WA
922 PM PDT Fri Aug 21 2026

Forecast is based on forecast start time of 2100 PDT on August 21. 
...HEAT ADVISORY IN EFFECT UNTIL 10 PM PDT THIS EVENING...
...RED FLAG WARNING IN EFFECT FROM NOON TO 10 PM PDT SATURDAY...

.DISCUSSION...

Mid and high clouds continue stream into the area. There is a 
small risk (20% chance) to receive sprinkles overnight into early 
Saturday morning. Any activity will be capable of brief erratic wind 
gusts around 15 mph.  Otherwise, winds will be quite dynamic and 
shifting directions over the next 12-18 hours, generally from the 
north tonight to northeast Saturday morning, east around midday and 
south in the afternoon.  Speeds will increase significantly after 1200 
and become strong in the afternoon and early evening shifting to the 
southwest then west as a cold front presses through 1600-1900.

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). 
***************************************************************

.REST OF TONIGHT...

Sky/weather.........Cloudy. Haze and patchy smoke. 30% chance of 
                    showers. 
CWR.................0 percent. 
Chance of lightning.5 percent. 
Min temperature.....72. 
Max humidity........33-38 percent. 
Wind (20 ft)........Northwest winds 5 to 7 mph gusts 11 mph becoming 
                    north to northeast around 8 mph after midnight. Erratic
                    winds to 15 mph near showers.
Mixing height.......500 ft AGL. 
Transport winds.....Northeast around 5 mph shifting to the north around 
                    9 mph overnight. 
Ventilation Index...Low (48). 

.SATURDAY...

Sky/weather.........Mostly sunny. Haze and patchy smoke in the 
                    morning. 
CWR.................0 percent. 
Chance of lightning.5 percent. 
Max temperature.....94. 
Min humidity........13-18 percent. 
Wind (20 ft)........Northeast to east winds 6 to 10 mph shifting to the south 
                    17 to 25 mph with gusts to around 34 mph in the 
                    afternoon after 1400.  Winds shifting to the southwest 
                    after 1600. 
Mixing height.......9000 ft AGL in the afternoon. 
Transport winds.....Southeast 12 to 18 mph becoming south 20 mph. 
Ventilation Index...High (578) increasing to very high (1568) in 
                    the afternoon. 

.SATURDAY NIGHT...

Sky/weather.........Partly cloudy. 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Min temperature.....Around 60. 
Max humidity........59-64 percent. 
Wind (20 ft)........West winds 15 to 20 mph. Gusts up to 32 mph in 
                    the evening  decreasing west 8 to 13 mph overnight.
Mixing height.......6500 ft AGL falling to 500 ft AGL. 
Transport winds.....West 15 to 20 mph. 
Ventilation Index...Very high (1173) decreasing to low (50) 
                    overnight. 

$$
Forecaster...SB
Requested by...Jeremy Holt
Type of request...WILDFIRE
.TAG 2620225.0/OTX
.DELDT 08/21/26
.FormatterVersion 2.0.0
.EMAIL wacwc@firenet.gov,jjkistner@blm.gov