552
FNUS76 KPDT 261407
FWSPDT

Spot Forecast for How Go...Roslyn Fire
National Weather Service Pendleton OR
707 AM PDT Thu Sep 26 2024

Forecast is based on ignition time of 0800 PDT on September 26.
***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...Drier and cooler conditions over the fire area
today in the wake of the departing system. Afternoon humidities
will drop almost 40% from Wednesday with high temperatures about 6
degrees cooler. Skies will stay partly cloudy through the day,
with increasing clouds as a slight chance (15-25%) of a light
shower exists after 5 PM. Chances linger until 5 AM Friday with
0.01-0.03" possible. Winds will increase after 3 PM this afternoon
out of the southeast, turning out of the west northwest after 9
PM. Breezy winds are anticipated through Friday afternoon with
excellent overnight recoveries tonight.

.REST OF TODAY...

Sky/weather.........Mostly sunny (20-30 percent).
CWR.................0 percent.
LAL.................1.
Max temperature.....64-67.
Min humidity........24-29 percent.
Wind (20 ft)........West winds around 5 mph shifting to the
                    southeast 4 to 8 mph in the afternoon.
Ridgetop wind.......West winds 4 to 7 mph shifting to the
                    southeast 5 to 10 mph in the afternoon.
Mixing height.......3500 ft AGL.
Transport winds.....Southwest around 8 mph.
Haines Index........4 or low potential for large plume dominated
                    fire growth.

.TONIGHT...

Sky/weather.........Partly cloudy (30-40 percent) then becoming
                    mostly cloudy (50-60 percent). Slight chance of
                    rain showers.
CWR.................2 percent.
LAL.................1.
Min temperature.....46-49.
Max humidity........86-91 percent.
Wind (20 ft)........Northeast winds 4 to 8 mph shifting to the west
                    5 to 10 mph overnight.
Ridgetop wind.......Northeast winds 5 to 10 mph shifting to the
                    west 6 to 12 mph with gusts up to 20 mph over
                    exposed areas after 11 PM.
Mixing height.......2300 ft AGL early in the evening then 800 ft
                    AGL overnight.
Transport winds.....West around 8 mph.
Haines Index........2 or very low potential for large plume
                    dominated fire growth.

.FRIDAY...

Sky/weather.........Mostly sunny (30-40 percent).
CWR.................0 percent.
LAL.................1.
Max temperature.....63-66.
Min humidity........50-55 percent.
Wind (20 ft)........West winds 7 to 14 mph. Gusts up to 20 mph
                    after 11 AM.
Ridgetop wind.......West winds 10 to 16 mph. Gusts up to 25 mph
                    after 11 AM.
Mixing height.......2900 ft AGL.
Transport winds.....West around 15 mph.
Haines Index........4 or low potential for large plume dominated
                    fire growth.

$$
Forecaster...Callihan
Requested by...Chris Martin
Type of request...PRESCRIBED
.TAG 2423024.0/PDT
.DELDT 09/26/24
.FormatterVersion 2.0.0
.EMAIL chris.martin@roslynfire.org