112
FNUS76 KPDT 100500
FWSPDT

Spot Forecast for Rattlesnake Fire...U.S Fish and Wildlife Service
National Weather Service Pendleton OR
1000 PM PDT Thu Oct 9 2025

Forecast is based on forecast start time of 0600 PDT on October 10.
***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 the
   transport wind multiplied by the mixing
   height in 100`s of feet. Index categories
   are a generalized indicator only.***

If you have questions or concerns with this forecast, please
contact our office at (541) 276-8134.

.DISCUSSION...Main concern Friday will be increasing winds from the
southwest Friday as a low pressure system approaches offshore.
Moderate-High confidence (55-80%) that strong winds aloft will
descend along the northeast side of Rattlesnake mountain Friday
late morning through the early evening. Chances of wetting rains
will be low for the fire area. Afternoon RHs will be in the upper
20s Friday, and upper 30s Saturday with moderate overnight recovery.


.FRIDAY...

Sky/weather.........Cloudy (90-100 percent) then becoming partly
                    sunny (45-55 percent) then becoming sunny
                    (15-25 percent) then becoming partly sunny
                    (60-70 percent). Slight chance of rain showers
                    late in the afternoon.
CWR.................0 percent.
Chance of lightning.4 percent.
Max temperature.....74-77.
Min humidity........27-32 percent.
Wind (20 ft)........Southwest winds 5 to 10 mph increasing to 12 to
18 mph after 10AM. Gusts up to 33 mph
                    in the afternoon.
Ridgetop wind.......Southwest winds 7 to 12 mph increasing to 15 to
20 mph after 10AM. Gusts up to 37 mph in the
afternoon.
Mixing height.......5400 ft AGL early in the morning.
Transport winds.....Southwest 8 to 12 mph increasing to 18 to 25
                    mph late in the morning.
Ventilation Index...Poor (40) increasing to excellent (870) in the
                    afternoon.

TIME (PDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............55  57  57  59  63  66  69  72  72  72  73  70
RH..............47  49  50  49  47  42  38  35  32  31  31  35
20 FT wind dir..W   W   SW  SW  SW  SW  SW  SW  SW  SW  SW  W
20 FT wind spd..7   7   9   10  13  13  15  16  17  17  18  18
20 FT wind gust.        13  17  23  24  26  27  30  30  31  33

.FRIDAY NIGHT...

Sky/weather.........Mostly cloudy (60-70 percent) then becoming
                    partly cloudy (40-50 percent). Slight chance of
                    rain showers in the evening, then chance of
                    rain showers late in the evening.
CWR.................0 percent.
Chance of lightning.4 percent.
Min temperature.....49-52.
Max humidity........52-57 percent.
Wind (20 ft)........West winds 12 to 18 mph decreasing to 8 to 13 mph
after 6PM. Gusts up to 30 mph in the early evening.
Ridgetop wind.......West winds 15 to 20 mph decreasing to 10 to 15 mph
after 7PM. Gusts up to 35 mph in the early evening.
Mixing height.......700 ft AGL in the evening then 500 ft AGL early
                    in the morning.
Transport winds.....West 15 to 18 mph.
Ventilation Index...Poor (170) decreasing to poor (50) overnight.

.SATURDAY...

Sky/weather.........Mostly sunny (40-50 percent). Chance of rain
                    showers.
CWR.................3 percent.
Chance of lightning.1 percent.
Max temperature.....63-66.
Min humidity........37-42 percent.
Wind (20 ft)........Southwest winds 7 to 12 mph with gusts up to
25 mph in the late morning and afternoon.
Ridgetop wind.......West winds 10 to 15 mph with gusts up to
27 mph in the late morning and afternoon.
Mixing height.......6100 ft AGL.
Transport winds.....West 13 to 15 mph.
Ventilation Index...Poor (70) increasing to good (660) in the
                    afternoon.

$$
Forecaster...Lawhorn
Requested by...Moises Avila
Type of request...WILDFIRE
.TAG 2523286.0/PDT
.DELDT 10/09/25
.FormatterVersion 2.0.0
.EMAIL Moisesavila1003@gmail.com