696
FNUS76 KPDT 211140
FWSPDT

Spot Forecast for North Cayuse...WFS
National Weather Service Pendleton OR
440 AM PDT Tue Jul 21 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.

...HEAT ADVISORY IN EFFECT FROM 11 AM THIS MORNING TO 9 PM PDT
THURSDAY...

.DISCUSSION...Dry and warming conditions will persist as upper
level high pressure builds over the region. Smoke from local and
regional fires may produce reduced visibilities, as well as limit
daytime heating. Winds will be diurnally driven, with downslope
winds overnight becoming northwest winds late in the morning.
Unstable conditions will develop Wednesday afternoon.

.TODAY...

Sky/weather.........Mostly sunny (30-40 percent). Patchy smoke.
CWR.................0 percent.
Chance of lightning.2 percent.
Max temperature.....85-93.
Min humidity........18-23 percent.
Wind (20 ft)........Downslope winds becoming northwest 5 to 8 mph
around 10AM, then shifting to the north around
2PM.
Ridgetop wind.......Light winds becoming northwest 5 to 10 mph
around 10AM, then shifting to the north around
2PM.
Mixing height.......5100 ft AGL.
Transport winds.....South around 5 mph shifting to the northwest 5
                    to 8 mph early in the morning.
Ventilation Index...Low (30) increasing to moderate (250-260) 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............68     70     76     82     86     88
RH..............37     37     34     29     25     23
20 ft wind......S 3    SW 3   NW 6   NW 7   N 8    N 8
20 ft wind gust.4      4             10     11     10

.TONIGHT...

Sky/weather.........Partly cloudy (30-40 percent) then becoming
                    mostly cloudy (50-60 percent). Patchy smoke.
CWR.................0 percent.
Chance of lightning.2 percent.
Min temperature.....70-73.
Max humidity........32-37 percent.
Wind (20 ft)........North winds 5 to 8 mph becoming downslope winds
3 to 6 mph after 8PM.
Ridgetop wind.......North winds 5 to 10 mph becoming light after
8PM.
Mixing height.......3500 ft AGL early in the evening then 500 ft
                    AGL early in the morning.
Transport winds.....North around 8 mph shifting to the east around
                    6 mph early in the evening, then shifting to
                    the south around 7 mph late in the evening.
Ventilation Index...Low (80-90) decreasing to low (30) overnight.

.WEDNESDAY...

Sky/weather.........Mostly sunny (40-50 percent). Patchy smoke.
CWR.................0 percent.
Chance of lightning.2 percent.
Max temperature.....88-96.
Min humidity........18-23 percent.
Wind (20 ft)........Downslope winds 3 to 6 mph becoming northwest
5 to 10 mph around 10AM.
Ridgetop wind.......Light winds becoming northwest 6 to 12 mph
around 10AM.
Mixing height.......9200 ft AGL.
Transport winds.....South around 7 mph shifting to the northwest 6
                    to 8 mph late in the morning.
Ventilation Index...Low (50-60) increasing to moderate (460) in the
                    afternoon.

$$
Forecaster...Lawhorn
Requested by...IC
Type of request...WILDFIRE
.TAG 2617422.5/PDT
.DELDT 07/21/26
.FormatterVersion 2.0.0
.EMAIL SydneyThompson@ctuir.org,robert_nix@bia.gov,michael_s_smith@firenet.gov