342
FNUS76 KPDT 300246
FWSPDT

Spot Forecast for Hermiston Highway...Umatilla Co
National Weather Service Pendleton OR
746 PM PDT Fri May 29 2026

Forecast is based on forecast start time of 2000 PDT on May 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...

Steady west winds around 15-18 mph with gusts to near 30 mph will
remian unchanged through the late evening, but begin to weaken after
about 1 am. Gusts should weaken to under 20 mph by the morning hours
on Saturday as relative humidity recovers to around 65 percent for
the overnight. Winds will increase to around 15 mph gusting to 25 mph
by late Saturday morning.



.REST OF TONIGHT...

Sky/weather.........Mostly cloudy (65-75 percent) then becoming
                    partly cloudy (25-35 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....44-47.
Max humidity........64-69 percent.
Wind (20 ft)........Southwest winds 9 to 22 mph. Gusts up to 36 mph
                    early in the evening.
Mixing height.......500 ft AGL early in the evening then 800 ft AGL
                    early in the morning.
Transport winds.....Southwest 16 to 24 mph.
Ventilation Index...Moderate (400) decreasing to low (80)
                    overnight.

TIME (PDT)      8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM 6AM 7AM
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............61  58  56  54  52  50  49  47  46  46  45  47
RH..............47  51  55  56  60  64  65  66  67  69  69  65
20 FT wind dir..W   SW  SW  SW  SW  SW  SW  SW  SW  SW  SW  SW
20 FT wind spd..22  22  21  21  20  19  17  17  15  14  15  15
20 FT wind gust.29  26  26  25  23  22  21  20  19  18  19  19

.SATURDAY...

CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....70-73.
Min humidity........27-32 percent.
Wind (20 ft)........West winds 7 to 18 mph.
Mixing height.......6200 ft AGL.
Transport winds.....West 13 to 17 mph.
Ventilation Index...Moderate (270) increasing to high (660) in the
                    afternoon.

.SATURDAY NIGHT...

Sky/weather.........Mostly clear (15-25 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....45-48.
Max humidity........67-72 percent.
Wind (20 ft)........Southwest winds 6 to 15 mph.
Mixing height.......500 ft AGL in the evening and overnight then
                    500 ft AGL early in the morning.
Transport winds.....Southwest 13 to 17 mph.
Ventilation Index...Moderate (360) decreasing to low (60)
                    overnight.

$$
Forecaster...Russell
Requested by...Cynthia Lemmon
Type of request...WILDFIRE
.TAG 2614671.0/PDT
.DELDT 05/29/26
.FormatterVersion 2.0.0
.EMAIL cynthialemmon@umatillacounty.gov