709
FNUS76 KPDT 180327
FWSPDT

Spot Forecast for Vessey...Yakama Agency
National Weather Service Pendleton OR
827 PM PDT Fri Oct 17 2025

Forecast is based on ignition time of 2000 PDT on October 17.
***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 the
   transport wind multiplied by the mixing
   height in 100`s of feet. Index categories
   are a generalized indicator only.***

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

.DISCUSSION...A morning inversion will break around 1000. Winds
will slowly increase through the afternoon as a system approaches
the coast, increasing cloud cover and rain chances. Rain amounts
of 0.01-0.05" after 1700 Saturday, with 0.20-0.25" expected on
Sunday as the bulk of rainfall is likely overnight associated with
the cold front passage. Winds will increase Saturday night and
into Sunday morning as the front approaches and passes, staying
elevated through the day on Sunday. Highs will cool about 5
degrees Saturday to Sunday.

.REST OF TONIGHT...

Sky/weather.........Mostly clear (15-25 percent). Widespread frost
                    after 2300.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....28-31.
Max humidity........74-79 percent.
Wind (20 ft)........Southwest winds 3 to 7 mph.
Ridgetop wind.......Southwest winds 4 to 8 mph.
Mixing height.......100 ft AGL.
Transport winds.....West 5 to 8 mph shifting to the south 6 to 7
                    mph overnight.
Ventilation Index...Poor (70) decreasing to poor (30) overnight.

TIME (PDT)      8 PM   10 PM  MIDNGT 2 AM   4 AM   6 AM
Chc of ltng (%).0      0      0      0      0      0
Temp............40     37     34     33     31     29
RH..............70     74     75     76     77     78
20 ft wind......SW 4   W 3    SW 3   SW 6   SW 4   SW 6
20 ft wind gust.7      6      6      8      7      9

.SATURDAY...

Sky/weather.........Mostly sunny (30-40 percent) then becoming
                    mostly cloudy (70-80 percent). Widespread frost
                    early in the morning. Slight chance (10-20
                    percent) of rain showers after 1100. Chance
                    (40-55 percent) of rain showers after 1700.
CWR.................0 percent increasing to 11 percent late in the
                    afternoon.
Chance of lightning.1 percent.
Max temperature.....56-60.
Min humidity........30-36 percent.
Wind (20 ft)........Southwest winds 3 to 7 mph becoming 7 to 12
                    mph with gusts up 15 mph after 1200.
Ridgetop wind.......Southwest winds 4 to 8 mph becoming 8 to 15
                    mph with gusts up to 18 mph after 1200.
Mixing height.......1000 ft AGL late in the morning.
Transport winds.....Southwest 7 to 14 mph.
Ventilation Index...Poor (40) increasing to poor (130) in the
                    afternoon.

.SATURDAY NIGHT...

Sky/weather.........Mostly cloudy (60-70 percent). Chance (50-60
                    percent) of rain showers after 2000, then
                    rain showers (70-80 percent) after 2300.
CWR.................11 percent increasing to 79 percent late in the
                    evening, then decreasing to 14 percent early in
                    the morning.
Chance of lightning.0 percent.
Min temperature.....42-46.
Max humidity........85-90 percent.
Wind (20 ft)........Southwest winds 7 to 12 mph with gusts up to
                    15 mph becoming 12 to 18 mph with gusts up to
                    33 mph after 2000.
Ridgetop wind.......Southwest winds 8 to 15 mph with gusts up to 18
                    mph becoming 15 to 20 mph with gusts up to 36
                    mph after 2000.
Mixing height.......500 ft AGL in the evening then 1100 ft AGL
                    early in the morning.
Transport winds.....Southwest 14 to 20 mph increasing to 22 to 29
                    mph overnight.
Ventilation Index...Poor (100) increasing to poor (120) overnight.

.SUNDAY...

Sky/weather.........Mostly sunny (40-50 percent). Rain showers
                    likely (65-75 percent), then chance (20-30
                    percent) of rain showers after 1700.
CWR.................20 percent decreasing to 0 percent late in the
                    afternoon.
Chance of lightning.0 percent.
Max temperature.....49-52.
Min humidity........60-65 percent.
Wind (20 ft)........Southwest winds 12 to 18 mph with gusts up 33
                    mph, peaking between 0800 and 1300.
Ridgetop wind.......Southwest winds 15 to 20 mph with gusts up to
                    36 mph, peaking between 0800 and 1300.
Mixing height.......2900 ft AGL.
Transport winds.....Southwest 22 to 26 mph increasing to 29 to 36
                    mph late in the morning.
Ventilation Index...Fair (290) increasing to excellent (780) in the
                    afternoon.

$$
Forecaster...Callihan
Requested by...Dan Sims
Type of request...PRESCRIBED
.TAG 2523858.0/PDT
.DELDT 10/17/25
.FormatterVersion 2.0.0
.EMAIL dan_sims@yakama.com