012
FNUS76 KPDT 251328
FWSPDT

Spot Forecast for Tracy Hill RX...USFS
National Weather Service Pendleton OR
628 AM PDT Wed Sep 25 2024

Forecast is based on ignition time of 0600 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
the burn site 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. The cool
marine air spreading through the Columbia River Gorge will keep
RHs high. Nearby showers or thunderstorms could bring outflow
winds of 25-30 mph. It will be cooler but drier and less wind on
Thursday.


.TODAY...

Sky/weather.........Increasing clouds, becoming mostly
                    cloudy (75-85 percent). Sprinkles or a brief
                    shower before 1000 PDT. Chance of
                    showers and a slight chance of thunderstorms
                    after 1000 PDT.
CWR.................less than 10 percent.
LAL.................1 until 1100, then 2.
Max temperature.....65-68.
Min humidity........59-64 percent.
Wind (20 ft)........West 5-8 mph increasing to 8-13 mph gusting to 20
                    mph between 0900-1300...then increasing to 10-15
                    mph gusting to 25 mph after 1300. Gusty and erratic
                    winds expected near thunderstorms.
Ridgetop wind.......West 5-8 mph increasing to 10-18 mph gusting to 23
                    between 1000-1400, then 15-20 mph gusting to 30 mph
                    after 1400.
Mixing height.......rising to 2500 ft AGL during the mid-morning.
Transport winds.....West 18-23 mph.
Haines Index........3 or very low potential for large plume dominated
                     fire growth.

TIME (PDT)      6 AM   8 AM   10 AM  NOON   2 PM   4 PM
Temp............60     56     61     65     63     62
RH..............71     85     83     74     75     74
20 ft wind......W 5    W 8    W 10   W 13   W 14   W 15
20 ft wind gust.       12     18     20     23     25

.TONIGHT...

Sky/weather.........Mostly cloudy (80-90 percent) then becoming
                    partly cloudy (25-35 percent). Chance of rain
                    showers early in the evening.
CWR.................less than 10 percent.
LAL.................1.
Min temperature.....44-47.
Max humidity........92-97 percent.
Wind (20 ft)........West 10-15 mph gusting to 25 mph decreasing to 8-12 mph
                    after 2100.
Ridgetop wind.......West 15-20 mph gusting to 30 mph decreasing to 10-15 mph
                    gusting to 20 mph after 2100.  Winds 8-12 mph by early
                    Thursday morning.
Mixing height.......lowering to 700 ft AGL in the evening.
Transport winds.....West 18 mph decreasing to around 8 mph
                    early in the morning.
Haines Index........3 or very low potential for large
                    plume dominated fire growth.

.THURSDAY...

Sky/weather.........Sunny (0-10 percent).
CWR.................0 percent.
LAL.................1.
Max temperature.....65-68.
Min humidity........36-41 percent.
Wind (20 ft)........West-Northwest 4-9 mph.
Ridgetop wind.......West-Northwest 8-12 mph.
Mixing height.......rising to 3500 ft AGL late in the morning.
Transport winds.....West 12 mph.
Haines Index........3 or very low potential for large
                    plume dominated fire growth.

$$

Forecaster...Wister
Requested by...Lauren Clark
Type of request...PRESCRIBED
.TAG 2422974.1/PDT
.DELDT 09/25/24
.FormatterVersion 2.0.0
.EMAIL christopher.harper@usda.gov,lauren.clark@usda.gov,keith.mcmillen@usda.gov