404
FNUS76 KPDT 130705
FWSPDT

Spot Forecast for Margraf RX...MARS
National Weather Service Pendleton OR
1205 AM PDT Tue Oct 13 2026

Forecast is based on ignition time of 0600 PDT on October 13.
***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...Dry conditions will persist over the RX area through
the period. Winds will be mainly diurnally/terrain driven below
10 mph with relative humidity in the upper 30% to low 40%. Inversion
will break after 1100. Tuesday night will see continued diurnal winds
with recoveries over 80%. Wednesday will see continued diurnal/terrain
driven winds under 10 mph with relative humidity in the low to mid 40%.
Inversion will break after 1100.

.TUESDAY...

Sky/weather.........Sunny (20-30 percent). Widespread frost early
                    in the morning, then areas of frost early in
                    the morning.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....61-64.
Min humidity........39-44 percent.
Wind (20 ft)........Light winds becoming southwest 5 to 8 mph after
                    1000.
Mixing height.......2700 ft AGL early in the morning.
Transport winds.....Light winds becoming west around 6 mph late in
                    the morning.
Ventilation Index...Low (30) increasing to low (120) in the
                    afternoon.

TIME (PDT)      6 AM   8 AM   10 AM  NOON   2 PM   4 PM
Chc of ltng (%).0      0      0      0      0      0
Temp............35     35     46     53     59     61
RH..............70     78     64     52     44     42
20 ft wind......N 3    NW 4   SW 4   SW 6   SW 7   SW 7
20 ft wind gust.                            8

.TUESDAY NIGHT...

Sky/weather.........Partly cloudy (35-45 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....39-42.
Max humidity........85-90 percent.
Wind (20 ft)........Southwest winds around 5 mph through 1600
                    becoming light, then becoming northwest
                    5 to 7 mph after 0300 am.
Mixing height.......1100 ft AGL early in the evening.
Transport winds.....West 5 to 6 mph shifting to the northwest
                    around 5 mph late in the evening.
Ventilation Index...Low (30).

.WEDNESDAY...

Sky/weather.........Sunny (15-25 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....66-69.
Min humidity........43-48 percent.
Wind (20 ft)........Northwest winds 5 to 7 mph through 0800
                    becoming light, then becoming southwest 5 to 7
                    mph after 1100.
Mixing height.......3500 ft AGL early in the morning.
Transport winds.....Northwest around 5 mph shifting to the south
                    late in the afternoon.
Ventilation Index...Low (30) increasing to low (150) in the
                    afternoon.

$$
Forecaster...Bennese
Requested by...Lucas King
Type of request...PRESCRIBED
.TAG 2623642.0/PDT
.DELDT 10/13/26
.FormatterVersion 2.0.0
.EMAIL lucas@mtadamsstewards.org