767
FNUS76 KPDT 240121
FWSPDT

Spot Forecast for osbourne rx...YAKAMA AGENCY
National Weather Service Pendleton OR
621 PM PDT Mon Jun 23 2025

Forecast is based on ignition time of 0800 PDT on June 24.
***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 weak front will move through the area on Tuesday,
causing a slight uptick in winds out of the Southwest, however no
rain is anticipated. Behind this front, temperatures will become
cooler, allowing RHs to improve through the rest of the work week.
The weather pattern will continue to support periodically breezy
conditions for the site through the week, but RH recoveries will
be good.

.TUESDAY...

Sky/weather.........Sunny (20-30 percent) then becoming mostly
                    cloudy (80-90 percent).
CWR.................0 percent.
Chance of lightning.2 percent.
Max temperature.....91-94.
Min humidity........15-20 percent.
Wind (20 ft)........Northwest winds 5 to 8 mph early, becoming
                    South-Southwest at 7 to 13 mph by the late
                    afternoon.
Mixing height.......10300 ft AGL.
Transport winds.....West around 5 mph early, shifting to the Southwest
                    8 to 16 mph by the afternoon.
Ventilation Index...Poor (60) increasing to excellent (820) in the
                    afternoon.

TIME (PDT)      8 AM   10 AM  NOON   2 PM   4 PM   6 PM
Chc of ltng (%).0      0      0      0      0      0
Temp............68     77     84     88     91     90
RH..............48     37     27     23     20     22
20 ft wind......NW 6   NW 6   S 7    SW 10  SW 10  SW 12
20 ft wind gust.              11     17     17     18

.TUESDAY NIGHT...

Sky/weather.........Mostly cloudy (65-75 percent) then becoming
                    partly cloudy (35-45 percent).
CWR.................0 percent.
Chance of lightning.2 percent.
Min temperature.....Around 60.
Max humidity........62-67 percent.
Wind (20 ft)........Southwest winds 6 to 13 mph shifting to the
                    Northwest 5 to 10 mph late in the evening.
Mixing height.......600 ft AGL.
Transport winds.....Northwest 12 to 16 mph decreasing to 6 to 9 mph
                    overnight.
Ventilation Index...Fair (410) decreasing to poor (50) overnight.

.WEDNESDAY...

Sky/weather.........Mostly sunny (25-35 percent).
CWR.................0 percent.
Chance of lightning.1 percent.
Max temperature.....85-88.
Min humidity........21-26 percent.
Wind (20 ft)........West-Northwest winds 5 to 8 mph increasing
                    to 7 to 14 mph late in the afternoon.
Mixing height.......8600 ft AGL.
Transport winds.....West 6 to 10 mph, increasing to 12 to 16 mph
                    by the afternoon.
Ventilation Index...Poor (90) increasing to good (600) in the
                    afternoon.

$$
Forecaster...Evans
Requested by...SAMANTHA WATLAMET
Type of request...PRESCRIBED
.TAG 2516545.0/PDT
.DELDT 06/24/25
.FormatterVersion 2.0.0
.EMAIL samantha_watlamet@yakama.com