087
FNUS76 KOTX 152352
FWSOTX

Spot Forecast for SISI...CENTRAL WASHINGTON INTERAGENCY COMMUNICATIONS
National Weather Service Spokane WA
452 PM PDT Sat Aug 15 2026

Forecast is based on forecast start time of 1700 PDT on August 15.
.DISCUSSION...

Discussion:
Expect mild temperatures through the next several days, with
recurring chances for showers and thunderstorms each day, peaking
during the afternoon and evening hours. Lightning chances will
continue to weaken each day. Thunderstorms will be capable of
producing brief heavy downpours and gusty, erratic winds. Winds
will generally be light away from thunderstorms. Precip amounts
are expected to be a few hundredths at most. Relative humidity
recoveries will be moderate to good. Winds outside of
thunderstorms will be light and terrain driven.

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 TODAY...

Sky/weather.........Partly sunny. Areas of smoke. Chance of rain
                    showers and slight chance of thunderstorms.
CWR.................15 percent.
Chance of lightning.20 percent.
Max temperature.....Around 64.
Min humidity........43-48 percent.
Wind (20 ft)........Southwest downslope, downvalley 3 to 6 mph. Gusty
                    and erratic winds expected near thunderstorms.
Mixing height.......2000 ft AGL.
Transport winds.....South around 5 to 10 mph.
Ventilation Index...Low (125).

.TONIGHT...

Sky/weather.........Mostly cloudy then becoming partly cloudy.
                    Chance of rain showers and slight chance of
                    thunderstorms in the evening. Haze and patchy
                    smoke through the night.
CWR.................15 percent.
Chance of lightning.20 percent.
Min temperature.....Around 52.
Max humidity........65-70 percent. Good Recovery
Wind (20 ft)........Southwest downslope, downvalley 3 to 6 mph. Gusty
                    and erratic winds expected near thunderstorms.
Mixing height.......1500 ft AGL.
Transport winds.....Northwest around 5 mph.
Ventilation Index...Low (76).

.SUNDAY...

Sky/weather.........Partly sunny. Patchy smoke in the morning. Haze
                    through the day. Slight chance of showers and
                    thunderstorms through the day.
CWR.................10 percent.
Chance of lightning.15 percent.
Max temperature.....Around 65-70.
Min humidity........45-50 percent.
Wind (20 ft)........North upslope/upvalley through 1100. Becoming
                    Southwest downslope, downvalley 4 to 8 mph. Gusty
                    and erratic winds expected near thunderstorms.
Mixing height.......2000 ft AGL at 0900 increasing to 5500 ft AGL
                    in the afternoon.
Transport winds.....Northeast around 5 to 10 mph shifting to the
                    southwest around 8 to 12 mph in the afternoon.
Ventilation Index...Moderate (272).

$$
Forecaster...JCLEV
Requested by...JASON RUSSELL
Type of request...WILDFIRE
.TAG 2619765.0/OTX
.DELDT 08/15/26
.FormatterVersion 2.0.0
.EMAIL WACWC@FIRENET.GOV