239
FNUS76 KPDT 100047
FWSPDT

Spot Forecast for Wolf Fork...SEWA IMT
National Weather Service Pendleton OR
547 PM PDT Fri Aug 9 2024

Forecast is based on forecast start time of 0600 PDT on August 10.
***Thunderstorms imply gusty and erratic winds***
***Winds are 20 foot 10-minute averages***
***CWR-Chance of wetting rain 0.10 or greater***

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

.DISCUSSION...A weather system currently bearing down on the
Pacific Northwest will make for shower and thunderstorm chances,
but primarily for the Cascades and far eastern mountains of Oregon
and SE Washington. Models do show a slight chance of storms moving
over the Basin and impacting the site during the day Saturday,
however, but confidence on this occurring is low. Outside of storm
chances, expect light, terrain-driven winds and partly cloudy to
clear conditions, with gradually cooling temps and improving RHs.

As far as the inversion layer and wind direction is concerned, forecast
models suggest the inversion will break at around 10 AM Saturday
morning and settle back in at around 11 PM to midnight. Wind
direction at the surface is projected to shift to upslope by
around noon to 1 PM at the latest, becoming downslope at around 11
PM to midnight at the latest.

.SATURDAY...

Sky/weather.........Partly cloudy (30-40 percent). Haze.
CWR.................1 percent.
LAL.................1.
Max temperature.....89-92.
Min humidity........15-20 percent.
Wind (20 ft)........South winds 5 to 8 mph early, gradually
                    shifting clockwise to the Northwest by the
                    afternoon.
Ridgetop wind.......Southwest winds 5 to 8 mph early, becoming
                    Northwest at 6 to 12 mph by around 1 PM.
Mixing height.......9300 ft AGL by the afternoon.
Transport winds.....Northwest around 10 mph.
Haines Index........3 or very low potential for large plume
                    dominated fire growth.

.SATURDAY NIGHT...

Sky/weather.........Mostly clear (30-40 percent). A slight chance
                    of showers and thunderstorms early in the evening
                    (15 percent until 10 PM), then clear (10-20 percent
                    overnight). Haze.
CWR.................2 percent.
LAL.................1.
Min temperature.....61-64.
Max humidity........47-52 percent.
Wind (20 ft)........Northwest winds 5 to 8 mph early in the evening,
                    shifting to the South around 5 mph by
                    midnight.
Ridgetop wind.......Northwest winds 5 to 10 mph early in the evening,
                    shifting to the Southwest by midnight.
Mixing height.......6500 ft AGL early in the evening, then near-
                    surface overnight.
Transport winds.....Northwest around 8 mph, shifting Southwest
                    after midnight.
Haines Index........3 or very low potential for large plume
                    dominated fire growth.

.SUNDAY...

Sky/weather.........Sunny (5-15 percent). Haze.
CWR.................0 percent.
LAL.................1.
Max temperature.....Around 90.
Min humidity........17-22 percent.
Wind (20 ft)........South winds around 5 mph, shifting to the
                    Northwest 5 to 8 mph by around 1 PM.
Ridgetop wind.......Southwest winds 5 to 10 mph early, shifting
                    to the West by around 1 PM.
Mixing height.......9100 ft AGL by the afternoon.
Transport winds.....Southwest around 10 mph.
Haines Index........2 or very low potential for large plume
                    dominated fire growth.

$$
Forecaster...Evans
Requested by...David Winter
Type of request...WILDFIRE
.TAG 2419930.1/PDT
.DELDT 08/09/24
.FormatterVersion 2.0.0
.EMAIL david_winter@firenet.gov