898
FNUS76 KPDT 190433
FWSPDT

Spot Forecast for ROSS MORRIS FIRE...YCFD5
National Weather Service Pendleton OR
933 PM PDT Wed Jun 18 2025

Forecast is based on forecast start time of 2100 PDT on June 18.
***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...A cold front continues to depart to the southeast,
allowing winds to slowly dissipate through the evening and
overnight period into Thursday morning. Light winds initially
Thursday will increase as a system approaches the area from the
northwest, increasing winds overnight into Friday morning as a
slight chance of rain exists through the afternoon. Minimal
rainfall between a trace and 0.02" is expected Friday afternoon.

.REST OF TONIGHT...

Sky/weather.........Partly cloudy (25-35 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....50-53.
Max humidity........61-66 percent.
Wind (20 ft)........Northwest winds 7 to 14 mph with gusts up to
                    25 mph becoming 4 to 8 mph after 1 AM.
Mixing height.......1200 ft AGL late in the evening then 600 ft AGL
                    early in the morning.
Transport winds.....North 9 to 16 mph.
Ventilation Index...Good (550) decreasing to poor (50) overnight.

TIME (PDT)      9 PM   11 PM  1 AM   3 AM   5 AM   7 AM
Chc of ltng (%).0      0      0      0      0      0
Temp............68     63     60     55     51     55
RH..............35     45     51     58     66     57
20 ft wind......NW 15  NW 12  N 10   NW 6   NW 5   NW 5
20 ft wind gust.23     16     13

.JUNETEENTH...

Sky/weather.........Partly sunny (50-60 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....79-82.
Min humidity........13-18 percent.
Wind (20 ft)........Northwest winds 4 to 8 mph shifting to the
                    southwest 2 to 6 mph late by 11 AM, then
                    shifting to the west around 3 PM.
Mixing height.......5400 ft AGL.
Transport winds.....Northwest 5 to 9 mph shifting to the west 6 to
                    7 mph late in the afternoon.
Ventilation Index...Poor (110) increasing to fair (220) in the
                    afternoon.

.THURSDAY NIGHT...

Sky/weather.........Mostly cloudy (65-75 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....54-57.
Max humidity........53-58 percent.
Wind (20 ft)........West winds 2 to 6 mph becoming northwest 10 to
                    15 mph around 8 PM, decreasing 5 to 10 mph after
                    3 AM.
Mixing height.......500 ft AGL.
Transport winds.....West around 7 mph shifting to the northwest 10
                    to 16 mph early in the evening.
Ventilation Index...Poor (180) decreasing to poor (60) overnight.

.FRIDAY...

Sky/weather.........Mostly cloudy (65-75 percent) then becoming
                    partly sunny (50-60 percent) after 11 AM. Slight
                    chance (15-20 percent) of rain showers after 11
                    AM.
CWR.................1 percent.
Chance of lightning.5 percent.
Max temperature.....71-74.
Min humidity........22-27 percent.
Wind (20 ft)........West winds 6 to 12 mph increasing 10 to 15 mph
                    with gusts up to 20 mph after noon, peaking
                    between 3 PM and 6 PM.
Mixing height.......8600 ft AGL.
Transport winds.....West 12 to 16 mph.
Ventilation Index...Poor (180) increasing to excellent (810) in the
                    afternoon.

$$
Forecaster...Callihan
Requested by...K. BAUER
Type of request...WILDFIRE
.TAG 2516228.0/PDT
.DELDT 06/18/25
.FormatterVersion 2.0.0
.EMAIL DISPATCH@YCFD5.ORG