266
FNUS76 KPDT 292342
FWSPDT

Spot Forecast for I-84 Fire...Umatilla County
National Weather Service Pendleton OR
442 PM PDT Sat Aug 29 2026

Forecast is based on forecast start time of 1700 PDT on August 29.
***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.

.DISCUSSION...Breezy west to southwest will continue through the evening
hours, before decreasing.  Winds should become more southwest this evening
and overnight.

MIN RH values will be around 25 to 30 percent, with good to excellent recoveries
overnight.

.REST OF TODAY...

Sky/weather.........Sunny (0-10 percent).
CWR.................0 percent.
Chance of lightning.1 percent.
Max temperature.....75-78.
Min humidity........25-30 percent.
Wind (20 ft)........West winds 12 to 20 mph with gusts 25 to 30
                    mph.
Mixing height.......5600 ft AGL.
Transport winds.....West around 18 mph.
Ventilation Index...Moderate (460).

TIME (PDT)      5PM 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............74  73  72  67  63  61  60  59  57  57  55  53
RH..............33  35  40  50  59  62  64  66  67  68  71  73
20 FT wind dir..W   W   W   W   W   W   SW  SW  SW  SW  SW  SW
20 FT wind spd..19  18  18  17  15  13  11  11  10  10  10  10
20 FT wind gust.28  26  24  23  20  18  14  14  13  14  14  13

.TONIGHT...

Sky/weather.........Mostly clear (5-15 percent).
CWR.................0 percent.
Chance of lightning.1 percent.
Min temperature.....50-53.
Max humidity........70-75 percent.
Wind (20 ft)........Southwest winds 10 to 20 mph with gusts to
                    around 25 mph decreasing to 10 to 15 mph during
                    the evening.
Mixing height.......5600 ft AGL early in the evening then 500 ft
                    AGL overnight
Transport winds.....Southwest 9 to 18 mph.
Ventilation Index...Moderate (460) decreasing to low (40)
                    overnight.

$$
Forecaster...Nierenberg
Requested by...Dispatch
Type of request...WILDFIRE
.TAG 2620904.0/PDT
.DELDT 08/29/26
.FormatterVersion 2.0.0
.EMAIL dispatch-group@umatillacounty.gov