280
FNUS76 KPDT 040715
FWSPDT

Spot Forecast for TUMBLE FIRE...USFS
National Weather Service Pendleton OR
1215 AM PDT Thu Jun 4 2026

Forecast is based on forecast start time of 0400 PDT on June 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...

Relative humidity This morning near  80 percent will decrease to
around 27 percent by the mid to late afternoon on light winds
(under 10 mph) out of the north northwest. The expected dry conditions
for Today will give way to greater chances for showers, (30 to 50% by
Friday evening and overnight).

.REST OF TONIGHT...

Sky/weather.........Mostly clear (15-25 percent).
CWR.................0 percent.
Chance of lightning.2 percent.
Min temperature.....41-44.
Max humidity........77-82 percent.
Wind (20 ft)........Northwest winds 5 to 7 mph.
Ridgetop wind.......Northwest winds 5 to 7 mph.
Mixing height.......500 ft AGL.
Transport winds.....West 12 to 13 mph.
Ventilation Index...

TIME (PDT)      4AM 5AM 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............41  41  41  43  45  48  52  55  58  61  62  62
RH..............83  82  79  71  63  55  48  44  39  35  34  32
20 FT wind dir..NW  NW  S   SW  SW  NW  N   N   N   N   NW  NW
20 FT wind spd..5   5   4   4   3   3   4   4   4   5   5   6
20 FT wind gust.10  10  8   7   6   6   7   8   10  10  11  11

.THURSDAY...

Sky/weather.........Sunny (10-20 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....63-66.
Min humidity........25-30 percent.
Wind (20 ft)........Light winds becoming northwest 5 to 7 mph in
                    the afternoon.
Ridgetop wind.......Light winds becoming northwest 7 to 10 mph in
                    the afternoon.
Mixing height.......3600 ft AGL.
Transport winds.....West 9 to 14 mph.
Ventilation Index...Low (120) increasing to moderate (320) in the
                    afternoon.

.THURSDAY NIGHT...

Sky/weather.........Mostly clear (10-20 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....Around 40.
Max humidity........72-77 percent.
Wind (20 ft)........Northwest winds 5 to 8 mph shifting to the
                    southwest 5 to 8 mph late in the evening, then
                    shifting to the southwest 6 to 12 mph early by
                    in the morning.
Ridgetop wind.......Northwest winds 5 to 8 mph shifting to the
                    southwest 5 to 8 mph late in the evening, then
                    shifting to the southwest 8 to 16 mph early by
                    in the morning.
Mixing height.......500 ft AGL.
Transport winds.....West 12 to 14 mph.
Ventilation Index...Low (180) decreasing to low (50) overnight.

.FRIDAY...

Sky/weather.........Mostly sunny (35-45 percent). Chance of rain
                    showers late in the afternoon.
CWR.................0 percent.
Chance of lightning.5 percent.
Max temperature.....55-58.
Min humidity........43-48 percent.
Wind (20 ft)........West winds 5 to 10 mph. Gusts up to 23 mph late
                    in the morning.
Ridgetop wind.......West winds 8 to 13 mph. Gusts up to 26 mph late
                    in the morning.
Mixing height.......4400 ft AGL.
Transport winds.....West 12 to 21 mph increasing to around 22 mph
                    late in the afternoon.
Ventilation Index...Low (180) increasing to very high (710) in the
                    afternoon.

$$
Forecaster...Russell
Requested by...WACCC
Type of request...WILDFIRE
.TAG 2614938.0/PDT
.DELDT 06/04/26
.FormatterVersion 2.0.0
.EMAIL michael.whitaker@usda.gov,Miles.Obrien@usda.gov,waccc@firenet.gov