670
FNUS76 KPDT 230058
FWSPDT

Spot Forecast for Tule burn rx...OR-WSA
National Weather Service Pendleton OR
558 PM PDT Thu Oct 22 2026

Forecast is based on ignition time of 1800 PDT on October 22.
***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.

...WIND ADVISORY IN EFFECT UNTIL 11 AM PDT FRIDAY...

.DISCUSSION...Breezy winds persist through the night before
slowly decreasing into Friday morning. Cooler (-5) temperatures
Friday, leading to Saturday morning temperatures in the mid-20s.
Inversion develops between 1900 and 2000 Friday and breaks up
around 1100 on Saturday. Light winds expected Saturday, with
directions veering from south to southeast to north through the
day.

.TONIGHT...

Sky/weather.........Mostly cloudy (70-80 percent) then becoming
                    partly cloudy (30-40 percent) after 0200.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....34-37.
Max humidity........88-93 percent.
Wind (20 ft)........Breezy. West winds 10 to 17 mph with gusts to
                    around 30 mph decreasing to 5 to 10 mph after
                    0400. Winds peak between 2100 and 0200
Ridgetop wind.......Breezy. West winds 14 to 20 mph with gusts to
                    around 35 mph decreasing to 6 to 12 mph after
                    0400. Winds peak between 2100 and 0200.
Mixing height.......500 ft AGL in the evening.
Transport winds.....Northwest around 13 mph shifting to the west 18
                    to 25 mph early in the evening, then decreasing
                    to around 10 mph early in the morning.
Ventilation Index...Low (140) decreasing to low (80) overnight.

TIME (PDT)      6 PM   8 PM   10 PM  MIDNGT 2 AM   4 AM
Chc of ltng (%).0      0      0      0      0      0
Temp............55     52     49     43     41     38
RH..............52     59     62     70     74     83
20 ft wind......NW 10  NW 11  W 17   W 15   W 14   W 13
20 ft wind gust.18     22     30     28     24     16

.FRIDAY...

Sky/weather.........Sunny (10-20 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....62-65.
Min humidity........32-37 percent.
Wind (20 ft)........West winds 5 to 10 mph shifting to the
                    southwest 4 to 8 mph mid-morning, then
                    shifting to the northwest after 1500.
Ridgetop wind.......West winds 6 to 12 mph shifting to the
                    southwest 5 to 10 mph mid-morning, then
                    shifting to the northwest after 1500.
Mixing height.......3500 ft AGL early in the morning.
Transport winds.....Northwest 6 to 10 mph.
Ventilation Index...Low (50) increasing to low (190) in the
                    afternoon.

.FRIDAY NIGHT...

Sky/weather.........Mostly clear (15-25 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....29-32.
Max humidity........85-90 percent.
Wind (20 ft)........Northwest winds 3 to 7 mph early in the evening
                    becoming light after 2100.
Ridgetop wind.......Northwest winds 4 to 8 mph in the evening
                    becoming light after 2100.
Mixing height.......1300 ft AGL early in the evening.
Transport winds.....Northwest 5 to 6 mph in the evening becoming
                    light, then becoming south around 5 mph
                    overnight.
Ventilation Index...Low (40) decreasing to low (30) overnight.

.SATURDAY...

Sky/weather.........Mostly sunny (20-30 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....65-68.
Min humidity........23-28 percent.
Wind (20 ft)........South winds 3 to 7 mph, then shifting to
                    the southeast after 1300, then from the
                    north after 1600.
Ridgetop wind.......South winds 4 to 8 mph, then shifting to
                    the southeast after 1300, then from the
                    north after 1600.
Mixing height.......1900 ft AGL late in the morning.
Transport winds.....South around 5 mph shifting to the northeast
                    around 6 mph late in the afternoon.
Ventilation Index...Low (30) increasing to low (60) in the
                    afternoon.

$$
Forecaster...Callihan
Requested by...Gary Sampson
Type of request...PRESCRIBED
.TAG 2624204.1/PDT
.DELDT 10/22/26
.FormatterVersion 2.0.0
.EMAIL gary.sampson@ctwsbnr.org