172
FNUS76 KPDT 212154
FWSPDT

Spot Forecast for Bologna Fire...USFS
National Weather Service Pendleton OR
254 PM PDT Fri Aug 21 2026

Forecast is based on forecast start time of 1800 PDT on August 21.
***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 THIS EVENING...
...RED FLAG WARNING IN EFFECT FROM NOON TO 10 PM PDT SATURDAY...

.DISCUSSION...Critical fire weather conditions expected to develop
tomorrow in the afternoon to evening hours Saturday. A weather system
will push through the area, bringing breezy winds with the dry air in the
area. This will create conditions to spread any existing or new ignitions.
Overnight recoveries will be fair to moderate tonight but is expected to
improve tomorrow night in the 55to 65 percent range.

.TONIGHT...

Sky/weather.........Mostly cloudy (70-80 percent).
CWR.................0 percent.
Chance of lightning.3 percent.
Min temperature.....62-67.
Max humidity........42-47 percent.
Wind (20 ft)........North winds 5 to 10 mph becoming light by 1 AM.
Ridgetop wind.......North winds 7 to 12 mph becoming light by 1 AM.
Mixing height.......500 ft AGL in the evening.
Transport winds.....North 9 to 14 mph shifting to the northeast 5
                    to 10 mph late in the evening, then shifting to
                    the west 5 to 10 mph early in the morning.
Ventilation Index...Low (170) decreasing to low (30) overnight.

TIME (PDT)      1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM 9PM 10P 11P MID
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............92  93  94  94  93  92  88  83  81  80  78  76
RH..............16  15  15  15  16  18  21  25  26  27  28  30
20 FT wind dir..W   NW  NW  NW  N   N   N   N   N   NE  NE  N
20 FT wind spd..5   6   6   6   7   6   5   4   4   5   6   6
20 FT wind gust.8   10  10  11  11  11  10  7   6   8   8   8

.SATURDAY...

Sky/weather.........Sunny (15-25 percent). Patchy smoke early in
                    the morning.
CWR.................0 percent.
Chance of lightning.5 percent.
Max temperature.....88-92.
Min humidity........14-19 percent.
Wind (20 ft)........Light winds, becoming west 5 to 10 mph by 10 AM.
                    Winds increasing to 7 to 12 mph by 1 PM with
                    gusts up to 25 mph.
Ridgetop wind.......Light winds, becoming west 7 to 12 mph by 10 AM.
                    Winds increasing to 10 to 15 mph by 1 PM with
                    gusts up to 30 mph.
Mixing height.......10800 ft AGL early in the morning.
Transport winds.....West 5 to 10 mph shifting to the southwest 10
                    to 15 mph early in the morning, then increasing
                    to 17 to 22 mph late in the afternoon.
Ventilation Index...Low (40-60) increasing to very high (1050) in
                    the afternoon.

.SATURDAY NIGHT...

Sky/weather.........Mostly clear (10-20 percent). Patchy smoke
                    early in the evening.
CWR.................0 percent.
Chance of lightning.1 percent.
Min temperature.....50-55.
Max humidity........60-65 percent.
Wind (20 ft)........Northwest winds 5 to 10 mph with gusts to
                    around 20 mph becoming light and variable by
                    11 PM.
Ridgetop wind.......Northwest winds 7 to 12 mph with gusts to
                    around 25 mph becoming light and variable by
                    11 PM.
Mixing height.......900 ft AGL in the evening.
Transport winds.....Northwest 10 to 20 mph shifting to the west
                    5 to 10 mph.
Ventilation Index...Moderate (370-400) decreasing to low (30)
                    overnight.

.SUNDAY...

Sky/weather.........Sunny (0-10 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....80-85.
Min humidity........15-20 percent.
Wind (20 ft)........Light winds becoming northwest 7 to 12 mph by
                    11 AM.
Ridgetop wind.......Light winds becoming northwest 10 to 20 mph by
                    11 AM.
Mixing height.......6600 ft AGL early in the morning.
Transport winds.....West 7 to 12 mph.
Ventilation Index...Low (30) increasing to moderate (470-480) in
                    the afternoon.

$$
Forecaster...Day
Requested by...Kristen Marshall
Type of request...WILDFIRE
.TAG 2620121.1/PDT
.DELDT 08/21/26
.FormatterVersion 2.0.0
.EMAIL kristen.marshall@usda.gov,Jonathan.Ellis@usda.gov