388
FNUS76 KPDT 202241
FWSPDT

Spot Forecast for Bologna Fire...USFS
National Weather Service Pendleton OR
341 PM PDT Thu Aug 20 2026

Forecast is based on forecast start time of 1600 PDT on August 20.
***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.

...HEAT ADVISORY IN EFFECT UNTIL 10 PM PDT FRIDAY...
...FIRE WEATHER WATCH IN EFFECT FROM SATURDAY AFTERNOON THROUGH
SATURDAY EVENING...

.DISCUSSION...Warm and dry conditions will persist over the fire
through the period. Daytime humidity will be in the single digits
to low teens with NW winds 5-7 mph becoming N after 1700 at 5-8
mph then light winds after 2000. Overnight recoveries will be in
the low 30%. Friday will see light winds becoming W 5-7 mph after
1100 then NW after 1400 the N after 1600 with daytime humidity in
the low teens. Temperatures will be in the 90s both days with
overnight temperatures in the 60s.

.REST OF TODAY...

Sky/weather.........Partly sunny (50-60 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....91-94.
Min humidity........9-14 percent.
Wind (20 ft)........Northwest winds 5 to 7 mph.
Ridgetop wind.......Northwest winds 7 to 9 mph.
Mixing height.......8400 ft AGL.
Transport winds.....West around 8 mph shifting to the north around
                    10 mph late in the afternoon.
Ventilation Index...

TIME (PDT)      4 PM   6 PM   8 PM   10 PM  MIDNGT 2 AM
Chc of ltng (%).0      0      0      0      0      0
Temp............93     91     83     78     74     72
RH..............14     16     24     26     28     30
20 ft wind......NW 6   N 7    N 5    NE 4   NE 4   NE 4
20 ft wind gust.10     11     10     7      6      6

.TONIGHT...

Sky/weather.........Mostly cloudy (80-90 percent). Patchy smoke
                    early in the morning.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....63-67.
Max humidity........31-40 percent.
Wind (20 ft)........North winds 5 to 8 mph through 2000 becoming
                    light overnight.
Ridgetop wind.......North winds 7 to 10 through 2000 becoming
                    variable 3 to 6 mph overnight.
Mixing height.......500 ft AGL in the evening.
Transport winds.....North 7 to 10 mph shifting to the northeast 5
                    to 6 mph overnight.
Ventilation Index...Moderate (210-230) decreasing to low (30)
                    overnight.

.FRIDAY...

Sky/weather.........Partly sunny (55-65 percent). Patchy smoke in
                    the morning and early afternoon.
CWR.................0 percent.
Chance of lightning.5 percent.
Max temperature.....92-95.
Min humidity........11-16 percent.
Wind (20 ft)........Light winds becoming west 5 to 7 mph after 1100,
                    then shifting to the northwest after 1400 shifting
                    to the north after 1600.
Ridgetop wind.......Variable winds 3 to 6 mph becoming west 7 to 9 mph
                    after 1100, then shifting to the northwest after
                    1400 shifting to the north after 1600.
Mixing height.......7600 ft AGL early in the morning.
Transport winds.....Northeast around 5 mph early in the morning
                    becoming light, then becoming south around 6
                    mph late in the morning shifting to the north
                    around 10 mph.
Ventilation Index...Low (30) increasing to low to moderate
                    (200-280) in the afternoon.

$$
Forecaster...Bennese
Requested by...Kristen Marshall
Type of request...WILDFIRE
.TAG 2620121.0/PDT
.DELDT 08/20/26
.FormatterVersion 2.0.0
.EMAIL kristen.marshall@usda.gov,Jonathan.Ellis@usda.gov