795
FNUS76 KPDT 271658
FWSPDT

Spot Forecast for Lamb Weston Exercise...Umatilla Dispatch
National Weather Service Pendleton OR
958 AM PDT Wed May 27 2026

Forecast is based on forecast start time of 1000 PDT on May 27.
***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...


Mostly cloudy conditions will start becoming  more sunny in the afternoon.
Today will be matched with north to northeast winds in the afternoon.
Relative humidity will fall to around 40 percent, recovering to around
85 percent overnight.


.REST OF TODAY...

Sky/weather.........Becoming Sunny (5-15 percent).
Chance of pcpn......0 percent.
Chance of lightning.2 percent.
Max temperature.....82-85.
Min humidity........37-42 percent.
Surface winds (mph).Northwest winds 6 to 9 mph shifting to the
                    northeast 6 to 10 mph late in the afternoon.
Mixing height.......5300 ft AGL.
Transport winds.....Northwest around 5 mph shifting to the
                    northeast 7 to 9 mph late in the morning.

TIME (PDT)      10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM 9PM
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............64  67  70  73  76  78  80  81  81  80  76  69
RH..............61  56  53  51  49  46  44  42  43  46  53  62
Surface wnd dir.W   NW  N   N   N   N   NE  NE  NE  NE  NE  N
Surface wnd spd.6   6   6   6   6   8   8   10  9   9   8   6
Surface wnd gst.7   7   8   8   8   10  10  12  10          7

.TONIGHT...

Sky/weather.........Partly cloudy (25-35 percent).
Chance of pcpn......0 percent.
Chance of lightning.2 percent.
Min temperature.....52-55.
Max humidity........83-88 percent.
Surface winds (mph).Northeast winds 6 to 10 mph shifting to the
                    south 6 to 9 mph late in the evening, then
                    becoming light overnight becoming southwest
                    around 6 mph overnight becoming light.
Mixing height.......4200 ft AGL early in the evening.
Transport winds.....Northeast 6 to 9 mph in the evening becoming
                    light, then becoming southwest around 5 mph
                    overnight becoming light.

.THURSDAY...

Sky/weather.........Partly sunny (50-60 percent) then becoming
                    mostly sunny (20-30 percent) then becoming
                    mostly cloudy (65-75 percent). Rain showers
                    likely and chance of thunderstorms late in the
                    afternoon.
Chance of pcpn......60 percent.
Chance of lightning.33 percent.
Max temperature.....Around 90.
Min humidity........34-39 percent.
Surface winds (mph).Light winds becoming northwest 6 to 9 mph late
                    in the morning, then shifting to the north
                    early in the afternoon shifting to the
                    northeast late in the afternoon shifting to the
                    southeast 6 to 10 mph.
Mixing height.......5900 ft AGL early in the morning.
Transport winds.....Light winds becoming northwest around 5 mph
                    early in the morning, then shifting to the
                    north 7 to 8 mph late in the morning shifting
                    to the southeast late in the afternoon.

$$
Forecaster...Russell
Requested by...JW Roberts
Type of request...OTHER
.TAG 2614552.0/PDT
.DELDT 05/27/26
.FormatterVersion 2.0.0
.EMAIL dispatch-group@umatillacounty.gov