046
FNUS76 KPDT 201750
FWSPDT

Spot Forecast for Lyons Ferry...SE WA Type 3 IMT - Team 3
National Weather Service Pendleton OR
1050 AM PDT Mon Jul 20 2026

Forecast is based on forecast start time of 0600 PDT on July 21.
***Thunderstorms imply gusty and erratic winds      ***
***Winds are 20 foot 10-minute averages             ***
***CWR: Chance of wetting rain 0.10 or greater      ***
***Ventilation Index is derived from transport wind
   multiplied by the mixing height in 100`s of ft.
   Categories are a generalized indicator only:
   low (< 200), moderate (200-500), high (500-700),
   and very high (> 700).                           ***

If you have questions or concerns with this forecast, please
contact our office at (541) 276-8134.

.DISCUSSION...Elevated fire weather conditions persist with dry
air paired with minimum relative humidities in the teens to low
20 percent range and sustained winds up to 10 mph. Winds
overnight through the early morning hours are likely to be light
enough to be terrain driven. Otherwise expected overnight
recoveries to be moderate.

.TUESDAY...

Sky/weather.........Partly sunny (50-60 percent). Patchy smoke late
                    in the morning.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....97-102.
Min humidity........12-17 percent.
Wind (20 ft)........Light winds becoming west 3 to 8 mph by 10 AM.
Ridgetop wind.......Light winds becoming west 7 to 12 mph by 10 AM.
Mixing height.......8600 ft AGL early in the morning.
Transport winds.....Southeast 5 to 10 mph shifting to the west 5
                    to 10 mph early in the morning.
Ventilation Index...Low (30) increasing to moderate (260-290) in
                    the afternoon.

TIME (PDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............67  70  74  79  85  88  92  94  96  98  98  99
RH..............48  44  38  32  28  25  22  20  19  18  18  18
20 FT wind dir..SE  SE  S   S   SW  W   W   W   W   W   W   W
20 FT wind spd..4   4   4   4   4   5   5   5   5   5   5   5
20 FT wind gust.                5   6   6   6   7   7   8   8

.TUESDAY NIGHT...

Sky/weather.........Partly cloudy (30-40 percent). Patchy smoke in
                    the evening and overnight.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....65-70.
Max humidity........43-48 percent.
Wind (20 ft)........West winds 5 to 10 mph becoming light by midnight.
Ridgetop wind.......West winds 7 to 12 mph becoming light by midnight.
Mixing height.......7500 ft AGL early in the evening then 500 ft
                    AGL late in the evening.
Transport winds.....Northwest 5 to 10 mph in the evening and
                    overnight becoming light, then becoming south
                    5 to 10 mph early in the morning.
Ventilation Index...Moderate (210-230) decreasing to low (30)
                    overnight.

.WEDNESDAY...

Sky/weather.........Sunny (15-25 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....101-104.
Min humidity........14-19 percent.
Wind (20 ft)........Light winds becoming southwest 5 to 10 mph by 10 AM.
Ridgetop wind.......Light winds becoming southwest 10 to 15 mph by 10 AM.
Mixing height.......10400 ft AGL early in the morning.
Transport winds.....Southwest 6 to 8 mph shifting to the west
                    around 8 mph late in the afternoon.
Ventilation Index...Low (40-50) increasing to moderate (370-400) in
                    the afternoon.

$$
Forecaster...Day
Requested by...Ryan Scharnhorst
Type of request...WILDFIRE
.TAG 2617804.0/PDT
.DELDT 07/20/26
.FormatterVersion 2.0.0
.EMAIL ryan.scharnhorst@pullman-wa.gov