380
FNUS76 KPDT 181359
FWSPDT

Spot Forecast for Three Trough Springs...USFS
National Weather Service Pendleton OR
659 AM PDT Sat Jul 18 2026

Forecast is based on forecast start time of 0600 PDT on July 18.
***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 low RHs and breezy
winds. High pressure strengthens over the fire area through the
weekend, keeping skies mostly clear as a warming and drying trend
continues. Winds will be light and variable Saturday morning
becoming north-northwest and picking up through the afternoon and
evening. Winds remain breezy out of the north Saturday night, then
let up early Sunday morning before picking up out of the north
again Sunday afternoon. RH recovery Saturday night will be poor.


.TODAY...

Sky/weather.........Sunny (0-10 percent). Patchy smoke.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....82-86.
Min humidity........17-21 percent.
Wind (20 ft)........Light and variable winds 1 to 3 mph becoming
                    north-northwest 5 to 9 mph after 1300, then
                    increasing to 10 to 14 mph after 1500.
Mixing height.......Inversion lifting around 0900. Mixing height
                    increasing to 6500 ft AGL in the afternoon.
Transport winds.....West 8 to 11 mph increasing to 15 to 21 mph
                    after 1200.
Ventilation Index...Low (40) increasing to moderate (400) in the
                    afternoon.

TIME (PDT)      6 AM   8 AM   10 AM  NOON   2 PM   4 PM
Chc of ltng (%).0      0      0      0      0      0
Temp............56     63     72     80     83     84
RH..............63     47     29     24     21     20
20 ft wind......NW 3   SE 2   SW 2   W 4    N 9    N 12
20 ft wind gust.5      5      6      8      12     14

.TONIGHT...

Sky/weather.........Clear (0-15 percent). Patchy smoke in the
                    evening and overnight.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....53-56.
Max humidity........52-56 percent.
Wind (20 ft)........North winds 10 to 14 mph with gusts to
                    around 20 mph in the evening decreasing to
                    6 to 9 mph after 2200.
Mixing height.......Falling to 500 ft AGL around 2100.
Transport winds.....Northwest 13 to 20 mph in the early evening
                    becoming north 11 to 16 mph after 1900.
Ventilation Index...Moderate (250) decreasing to low (30)
                    overnight.

.SUNDAY...

Sky/weather.........Sunny (0-20 percent) in the morning then
                    becoming partly sunny (20-40 percent) in
                    the afternoon.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....84-87.
Min humidity........13-17 percent.
Wind (20 ft)........Light and variable winds 1 to 4 mph in the
                    morning becoming north 7 to 12 mph after
                    1200.
Mixing height.......Inversion lifting around 0900. Mixing heights
                    increasing to 6500 ft AGL in the afternoon.
Transport winds.....North around 5 mph shifting to the west 7 to
                    13 mph in the afternoon.
Ventilation Index...Low (30) increasing to high (510) in the
                    afternoon.

$$
Forecaster...NWS Spokane
Requested by...Kristen Marshall
Type of request...WILDFIRE
.TAG 2617657.0/PDT
.DELDT 07/18/26
.FormatterVersion 2.0.0
.EMAIL kristen.marshall@usda.gov