505
FNUS76 KOTX 210628
FWSOTX

Spot Forecast for Caribou...ID-KVS
National Weather Service Spokane WA
1128 PM PDT Thu Aug 20 2026

Forecast is based on forecast start time of 2300 PDT on August 20.

...HEAT ADVISORY IN EFFECT FROM 11 AM TO 10 PM PDT FRIDAY...
...FIRE WEATHER WATCH IN EFFECT FROM SATURDAY AFTERNOON THROUGH
SUNDAY MORNING...

.DISCUSSION...

Conditions will be warm and dry with light winds Friday. High
clouds will move into the area through the day Friday evening and
overnight ahead of an approaching storm system. Slight chances for
showers move in early Saturday morning. Rainfall amounts will be
very light with less than a tenth of an inch expected. Chances for
showers wane through late Saturday morning through Saturday
afternoon, then ramp back up Saturday night with accompanying
chances for thunderstorms. Winds increase out of the west Saturday
afternoon as the storm system and associated cold front moves
through.

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

.FRIDAY...

Sky/weather.........Partly sunny.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....84-88.
Min humidity........19-23 percent.
Wind (20 ft)........Northeast winds 1-4 mph in the morning shifting
                    east 3-6 mph after 0900, then shifting southeast
                    with similar speeds after 1400.
Mixing height.......Inversion lifting around 0800. Mixing height
                    increasing to 8000 ft AGL in the afternoon.
Transport winds.....Northwest 5-8 mph in the early morning shifting
                    northeast 3-6 mph after 0900, then shifting
                    west-northwest 13-17 mph after 1300.
Ventilation Index...Low (199).

.FRIDAY NIGHT...

Sky/weather.........Partly cloudy in the evening becoming cloudy
                    overnight. 20 percent chance of showers and 5
                    percent chance of thunderstorms after 0400.
CWR.................5 percent.
Chance of lightning.5 percent after 0400.
Min temperature.....69-72.
Max humidity........38-42 percent.
Wind (20 ft)........East-northeast winds 1-4 mph in the evening
                    shifting north 4-7 mph after 2000, then shifting
                    northwest with similar speeds after 0500.
Mixing height.......Falling to 500 ft AGL around 2000.
Transport winds.....Northwest 5-8 mph.
Ventilation Index...Low (76).

.SATURDAY...

Sky/weather.........Mostly cloudy in the morning becoming mostly
                    sunny in the afternoon. 30 percent chance of
                    showers and 5 percent chance of thunderstorms
                    through the early morning. Chances for showers
                    and thunderstorms decrease to less than 5 percent
                    after 0900, then ramp back up late Saturday night
                    into Sunday.
CWR.................5 percent.
Chance of lightning.5 percent before 0900.
Max temperature.....83-87.
Min humidity........25-29 percent.
Wind (20 ft)........West winds 7-11 mph in the early morning shifting
                    east-northeast 5-8 mph after 1000, then shifting
                    west 11-15 mph after 1400.
Mixing height.......Inversion lifting around 0830. Mixing height
                    increasing to 7500 ft AGL in the afternoon.
Transport winds.....Northwest 7-11 mph in the early morning shifting
                    southwest 19-25 mph after 1200.
Ventilation Index...Low (193) increasing to very high (986) in the
                    afternoon.

$$
Forecaster...RFKS
Requested by...Gus Jackson
Type of request...WILDFIRE
.TAG 2620158.0/OTX
.DELDT 08/20/26
.FormatterVersion 2.0.0
.EMAIL gjackson@idl.idaho.gov