424
FNUS76 KPDT 251222
FWSPDT

Spot Forecast for Swauk Creek Fire...USFS
National Weather Service Pendleton OR
522 AM PDT Wed Sep 25 2024

Forecast is based on forecast start time of 0700 PDT on September 25.
***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 cold front will sweep across south central Washington this
afternoon with the estimated time of arrival at Swauk Creek between 1300-1500 PDT.
The front will only bring a light amount of rain to the Cascade east slopes. There will
also be enough instability for an isolated thunderstorm.  Nearby showers or thunderstorms
could bring outflow winds of 25-30 mph.  It will be windy along the ridges and breezy
along the west slopes.  Winds will diminish overnight. It will be cooler but drier
and less wind on Thursday.


.TODAY...

Sky/weather.........Increasing clouds. Becoming cloudy
                    (85-95 percent). Rain showers likely after 1000 PDT. A
                    slight chance of afternoon thunderstorms.
CWR.................10 percent. Most likely rainfall amounts less than 0.05 inch.
LAL.................1 until 1100, then 2.
Max temperature.....72-75.
Min humidity........35-40 percent.
Wind (20 ft)........Light winds becoming west 6-11 mph with
                    afternoon gusts to around 17 mph.
                    Gusty and erratic winds expected near
                    thunderstorms.
Ridgetop wind.......West 6-10 mph increasing to 12-18 mph with afternoon
                    gusts to 30 mph
Mixing height.......rising to 4000 ft AGL after 1000 PDT.
Transport winds.....West 13 mph increasing to 25 mph
                    late in the afternoon.
Haines Index........3 or very low potential for large plume
                    dominated fire growth.

TIME (PDT)      7 AM   9 AM   11 AM  1 PM   3 PM   5 PM
Temp............64     68     72     72     68     56
RH..............62     59     43     40     52     62
20 ft wind......N 3    W 4    W 8    W 8    W 11   W 10
20 ft wind gust.              14     14     17     17

.TONIGHT...

Sky/weather.........Mostly cloudy (80-90 percent) then becoming
                    partly cloudy (25-35 percent). Slight chance of
                    showers and thunderstorms early in the evening.
CWR.................0 percent.
LAL.................2 until 2000, then 1.
Min temperature.....Around 40.
Max humidity........83-88 percent.
Wind (20 ft)........West 8-12 mph gusting to 17 mph decreasing becoming
                    light downslope by early morning. Gusty and erratic
                    winds expected near thunderstorms early in the evening.
Ridgetop wind.......West 12-18 mph gusting to 30 mph until 2000 then
                    decreasing to 5-10 mph.
Mixing height.......1500 ft AGL in the early evening then 500 ft AGL.
Transport winds.....West 25 mph decreasing to 10 mph late in the evening.
Haines Index........3 or very low potential for large
                    plume dominated fire growth.

.THURSDAY...

Sky/weather.........Sunny (15-25 percent).
CWR.................0 percent.
LAL.................1.
Max temperature.....63-66.
Min humidity........18-23 percent.
Wind (20 ft)........West 3-7 mph.
Ridgetop wind.......Southwest-West 5-8 mph gusting to 13 mph.
Mixing height.......3700 ft AGL early in the morning.
Transport winds.....Northwest 8 mph shifting to the southwest
                    10 mph late in the morning.
Haines Index........3 or very low potential for large
                    plume dominated fire growth.

$$

Forecaster...Wister
Requested by...Rachel Granberg
Type of request...WILDFIRE
.TAG 2422869.5/PDT
.DELDT 09/25/24
.FormatterVersion 2.0.0
.EMAIL rachel.granberg@usda.gov