637
FNUS76 KPDT 142137
FWSPDT

Spot Forecast for Highland Fire...cofms / osfm
National Weather Service Pendleton OR
237 PM PDT Mon Jul 14 2025

Forecast is based on forecast start time of 1800 PDT on July 14.
***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...Breezy north-northwest winds will subside overnight, with
moderate RH recovery anticipated. A switch to north-northeast winds and
cooler temperatures are expected Tuesday as a cooler, drier air mass
moves over the burn site. However, the drier air mass will keep afternoon
RHs low. Hot, dry conditions are forecast Wednesday.

.TONIGHT...

Sky/weather.........Mostly clear (0-10 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....48-51.
Max humidity........60-65 percent.
Wind (20 ft)........North-northwest winds 10-15 mph with gusts of 15-25
                    mph in the evening, becoming light and variable
                    overnight.
Ridgetop wind.......North-northwest winds 10-15 mph with gusts of 15-25
                    mph in the evening, becoming light and variable
                    overnight.
Mixing height.......Decreasing to 300-600 ft AGL overnight.
Transport winds.....North 10-15 mph in the evening, decreasing to 4-7 mph
                    overnight.
Ventilation Index...Fair (480) decreasing to poor (50) overnight.

TIME (PDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............89  85  81  76  72  69  65  62  59  54  53  51
RH..............22  23  27  33  37  41  45  49  54  60  62  65
20 FT wind dir..NW  NW  N   N   N   N   N   N   NW  NW  NW  W
20 FT wind spd..18  18  13  13  13  7   7   7   5   5   5   4
20 FT wind gust.21  21  19  19  19  10  10  10  6   6   6   5

.TUESDAY...

Sky/weather.........Sunny (0-10 percent). Haze late in the morning.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....84-87.
Min humidity........20-25 percent.
Wind (20 ft)........Upslope 1-4 mph early morning, becoming north to
                    northeast 7-12 mph with gusts up to 20 mph late
                    morning and afternoon.
Ridgetop wind.......Upslope 1-4 mph early morning, becoming north to
                    northeast 7-12 mph with gusts up to 20 mph late
                    morning and afternoon.
Mixing height.......Increasing to 5800-6300 ft AGL by afternoon.
Transport winds.....North 5-10 mph in the morning, becoming north
                    to northeast 10-15 mph in the afternoon.
Ventilation Index...Poor (80) increasing to good (660) in the
                    afternoon.

.TUESDAY NIGHT...

Sky/weather.........Clear (0-10 percent). Haze in the evening.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....49-52.
Max humidity........69-74 percent.
Wind (20 ft)........North winds 10-15 mph with gusts up to 20 mph
                    in the evening, becoming drainage 1-4 mph overnight.
Ridgetop wind.......North winds 10-15 mph with gusts up to 20 mph
                    in the evening, becoming variable 1-4 mph overnight.
Mixing height.......Decreasing to 200-500 ft AGL overnight.
Transport winds.....North to northeast 10-15 mph in the evening,
                    becoming 5-10 mph overnight, then shifting to the
                    southeast early in the morning.
Ventilation Index...Fair (420) decreasing to poor (50) overnight.

.WEDNESDAY...

Sky/weather.........Sunny (0-10 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....91-94.
Min humidity........13-18 percent.
Wind (20 ft)........Upslope winds 1-4 mph through mid-morning, becoming
                    northwest 5-10 mph late morning and afternoon. Gusts
                    up to 15 mph in the afternoon.
Ridgetop wind.......Upslope winds 2-5 mph through mid-morning, becoming
                    northwest 5-10 mph late morning and afternoon. Gusts
                    up to 15 mph in the afternoon.
Mixing height.......Increasing to 6500-7000 ft AGL by afternoon.
Transport winds.....Southeast 4-6 mph early in the morning, becoming west
                    then northwest 7-10 mph late morning and afternoon.
Ventilation Index...Poor (30) increasing to poor (190) in the
                    afternoon.

$$
Forecaster...Plunkett
Requested by...Incident Command
Type of request...WILDFIRE
.TAG 2518003.0/PDT
.DELDT 07/14/25
.FormatterVersion 2.0.0
.EMAIL Shannon.Miller@OSFM.Oregon.gov