375
FNUS76 KPDT 291942
FWSPDT

Spot Forecast for Sundown Canyon Pile Burning...Crooked River Ranch Fire & Rescue
National Weather Service Pendleton OR
1142 AM PST Thu Jan 29 2026

Forecast is based on ignition time of 0800 PST on January 31.
***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...High pressure aloft will have developed over the
region by Saturday, and persist into early Sunday morning. Midday
Sunday (late Sunday morning into the early afternoon) a weak cold
front boundary will move across the burn area, shifting winds from
south to west, though winds will be under 10mph. A slight chance
light rain is possible, but rainshadowing to the west will limit
precip accumulations to under 0.05 inches. High pressure aloft will
limit mixing, though mixing height is expected to reach 2kft Saturday,
and over 3kft on Sunday.

.SATURDAY...

Sky/weather.........Mostly cloudy (70-80 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....56-59.
Min humidity........40-45 percent.
Wind (20 ft)........South winds 4 to 7 mph shifting to the east
                    around 4PM.
Mixing height.......2000 ft AGL.
Transport winds.....South 6 to 12 mph.
Ventilation Index...Poor (60-150) decreasing to poor (30-150) in
                    the afternoon.

TIME (PST)      8 AM   10 AM  NOON   2 PM   4 PM   6 PM
Chc of ltng (%).0      0      0      0      0      0
Temp............38     43     51     56     55     48
RH..............78     68     52     43     45     59
20 ft wind......S 5    S 6    S 6    SE 6   E 5    E 5
20 ft wind gust.6      7      7      8      6      6

.SATURDAY NIGHT...

Sky/weather.........Mostly cloudy (70-80 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....34-37.
Max humidity........78-83 percent.
Wind (20 ft)........East winds around 5 mph early in the evening
                    becoming light around 8PM, and becoming light
drainage winds in the canyon around 8PM.
Mixing height.......700 ft AGL.
Transport winds.....Southeast around 6 mph decreasing to around 5
                    mph in the evening, then shifting to the south
                    around 6 mph overnight.
Ventilation Index...Poor (30) increasing to poor (30-40) overnight.

.SUNDAY...

Sky/weather.........Mostly cloudy (70-80 percent) then becoming
                    mostly sunny (45-55 percent). Slight chance of
                    rain in the late morning and early afternoon.
CWR.................2 percent in the morning and early afternoon.
Chance of lightning.5 percent.
Max temperature.....50-53.
Min humidity........53-58 percent.
Wind (20 ft)........Light winds becoming south 5 to 8 mph around 7AM,
then shifting to the west 5 to 10 mph around 1PM.
Mixing height.......3200 ft AGL in the morning and early afternoon.
Transport winds.....South 6 to 9 mph increasing to west around 21
                    mph early in the afternoon.
Ventilation Index...Poor to fair (40-230).

$$
Forecaster...Lawhorn
Requested by...Sean Hartley Fire Chief
Type of request...PRESCRIBED
.TAG 2601332.0/PDT
.DELDT 01/29/26
.FormatterVersion 2.0.0
.EMAIL sean.hartley@crrfire-or.gov