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000
FNUS76 KPDT 231515
FWSPDT

Spot Forecast for Highway 20 N Unit #87...USFS
National Weather Service Pendleton OR
815 AM PDT Tue Apr 23 2024

Forecast is based on ignition time of 0800 PDT on April 24.
***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...Dry weather is expected during the day on
Wednesday and much of Wednesday night.  However, an approaching
upper level trough will bring a slight chance of showers by
Thursday morning,  There is a better chance of rain, with rain
becoming likely and CWR chances increasing to 70 percent by Thursday
afternoon.

Winds will start of rather light Wednesday morning but will increase
both Wednesday and Thursday afternoons.  Winds could gust as high as
20 mph Wednesday afternoon and possibly as high as 15 mph Thursday
afternoon.

MIN RH values will be around 35 to 30 percent today.  MIN RH values will
be much higher Thursday (55-65 percent) with rain moving in.  Overnight
recovery should be excellent.

.WEDNESDAY...

Sky/weather.........Partly sunny (45-55 percent).
CWR.................0 percent.
LAL.................1.
Max temperature.....62-65.
Min humidity........26-31 percent.
Wind (20 ft)........West winds 5 to 13 mph.
Ridgetop wind.......West wind 5 to 10 mph becoming northwest 10 to
                    15 mph in the afternoon.
Mixing height.......4700 ft AGL.
Transport winds.....West 12 to 21 mph.
Haines Index........3 to 4 or very low to low potential for large
                    plume dominated fire growth.

TIME (PDT)      8 AM   10 AM  NOON   2 PM   4 PM   6 PM
Temp............40     52     59     61     61     57
RH..............72     47     34     31     33     40
20 ft wind......W 6    W 6    W 8    W 12   W 12   W 13
20 ft wind gust.8      8      10     14     16     20

.WEDNESDAY NIGHT...

Sky/weather.........Mostly clear (10-20 percent) in the morning
                    then increasing cloudiness through the day
                    and becoming mostly cloudy (60-70 percent).
                    Slight chance (15-20%) of rain showers early
                    in the morning.
CWR.................2 percent.
LAL.................1.
Min temperature.....36-39.
Max humidity........82-87 percent.
Wind (20 ft)........West winds 5 to 13 mph shifting to the
                    southwest around 5 mph early in the morning.
Ridgetop wind.......Northwest wind becoming west 5 to 10 mph.
Mixing height.......500 ft AGL.
Transport winds.....West 12 to 21 mph decreasing to around 9 mph
                    early in the morning.
Haines Index........2 to 3 or very low potential for large plume
                    dominated fire growth.

.THURSDAY...

Sky/weather.........Mostly cloudy (65-75 percent). Slight chance of
                    rain showers in the morning, then rain showers
                    likely late in the morning. Rain showers late
                    in the afternoon.
CWR.................2 percent increasing to 70 percent.
LAL.................1.
Max temperature.....53-56.
Min humidity........58-63 percent.
Wind (20 ft)........West winds 5 to 10 mph with gusts to 15 mph
                    in the afternoon.
Ridgetop wind.......West wind becoming northwest 10 to 15 mph in
                    the afternoon then shifting back to the west
                    and decreasing to 5 to 10 mph in the evening.
Mixing height.......3600 ft AGL
Transport winds.....Southwest 9 to 18 mph shifting to the west
                    around 23 mph late in the afternoon.
Haines Index........2 or very low potential for large plume
                    dominated fire growth.

$$
Forecaster...Nierenberg
Requested by...Jyota Smith-Howard
Type of request...PRESCRIBED
.TAG 2411971.0/PDT
.DELDT 04/23/24
.FormatterVersion 2.0.0
.EMAIL jyota.smithhoward@usda.gov