666
FNUS76 KPDT 041318
FWSPDT

Spot Forecast for Conboy NW HQ...USFWS
National Weather Service Pendleton OR
618 AM PDT Mon May 4 2026

Forecast is based on ignition time of 0700 PDT on May 04.
***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...Good (60-65%) overnight humidity recoveries this
morning will lead to a cooler (-4) and less dry (+6%) day than
Sunday. Sunny skies today, with breezy afternoon winds due to a
weak gradient along the Cascades. Afternoon mixing heights will
change little today and Tuesday, but better ventilation will
occur today due to increased surface and transport winds. Dramatic
wind shifts expected Tuesday, northeast in the morning, then
southwest in the afternoon.

.REST OF TODAY...

Sky/weather.........Sunny (10-20 percent).
CWR.................0 percent.
Max temperature.....81-84.
Min humidity........29-34 percent.
Wind (20 ft)........Light winds becoming west 6 to 12 mph with
                    gusts up to 17 mph after 1300, peaking between
                    1500 and 1800.
Ridgetop wind.......Light winds becoming west 7 to 14 mph with
                    gusts up to 20 mph after 1300, peaking between
                    1500 and 1800.
Mixing height.......6400 ft AGL.
Transport winds.....North around 6 mph shifting to the northeast
                    late in the morning, then shifting to the west
                    9 to 12 mph late in the afternoon.
Ventilation Index...Low (70) increasing to moderate (250) in the
                    afternoon.

TIME (PDT)      7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM
Temp............53  56  60  67  72  77  79  79  80  81  79  77
RH..............61  61  58  49  41  37  34  35  34  35  36  40
20 FT wind dir..SW  SW  NE  NE  NE  SW  SW  W   W   W   NW  N
20 FT wind spd..1   2   1   2   4   2   8   8   10  10  9   8
20 FT wind gust.                        12  13  14  15  16  14

.TONIGHT...

Sky/weather.........Mostly clear (10-20 percent).
CWR.................0 percent.
Min temperature.....50-53.
Max humidity........75-80 percent.
Wind (20 ft)........West winds 6 to 12 mph with gusts up to 17
                    mph becoming 3 to 7 mph after 2100.
Ridgetop wind.......West winds 7 to 14 mph with gusts up to 20
                    mph becoming 4 to 8 mph after 2100.
Mixing height.......900 ft AGL.
Transport winds.....Northwest 6 to 12 mph.
Ventilation Index...Low (170) decreasing (50) overnight.

.TUESDAY...

Sky/weather.........Sunny (5-15 percent).
CWR.................0 percent.
Max temperature.....79-82.
Min humidity........32-37 percent.
Wind (20 ft)........West winds 3 to 7 mph shifting to the
                    northeast 5 to 10 mph with gusts up to 15
                    mph after 0800, then shifting to the
                    southwest after 1300.
Ridgetop wind.......West winds 4 to 8 mph shifting to the
                    northeast 6 to 12 mph with gusts up to 17 mph
                    after 0800, then shifting to the southwest
                    after 1300.
Mixing height.......6400 ft AGL.
Transport winds.....North 6 to 7 mph shifting to the east around 6
                    mph late in the morning, then shifting to the
                    west 7 to 8 mph late in the afternoon.
Ventilation Index...Low (60) increasing (100) in the
                    afternoon.

$$
Forecaster...Callihan
Requested by...Cory Thompson
Type of request...PRESCRIBED
.TAG 2612537.1/PDT
.DELDT 05/04/26
.FormatterVersion 2.0.0
.EMAIL cory_thompson@fws.gov