436
FNUS76 KPDT 301632
FWSPDT

Spot Forecast for SAFR #64...USFS
National Weather Service Pendleton OR
932 AM PDT Tue Apr 30 2024

Forecast is based on ignition time of 0800 PDT on May 01.
***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...An upper level low pressure system will move
across the region and bring rain chances later Wednesday into
Thursday.  Most of the daytime hours of Wednesday look dry.

MIN RH values will be about 25 to 30 percent on Wednesday and
significantly higher Thursday due to increased moisture and
rain potential, with excellent recovery Wednesday night.

.WEDNESDAY...

Sky/weather.........Sunny (15-25 percent) then becoming partly
                    sunny (55-65 percent). Slight chance (20%)
                    of rain showers late in the afternoon.
CWR.................0 percent.
LAL.................1.
Max temperature.....54-57.
Min humidity........28-33 percent.
Wind (20 ft)........West winds 5 to 7 mph shifting to the north 5
                    to 8 mph late in the morning, then shifting to
                    the northwest late in the afternoon.
Ridgetop wind.......West wind 10 to 15 mph in the morning, shifting
                    to the northwest and decreasing to around 5 to
                    10 mph in the afternoon.
Mixing height.......6500 ft AGL.
Transport winds.....West around 8 mph increasing to around 10 mph.
Haines Index........2 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............31     42     49     52     54     51
RH..............71     51     37     33     33     40
20 ft wind......W 5    W 5    N 5    N 7    N 7    NW 8
20 ft wind gust.              6      8      8      10

.WEDNESDAY NIGHT...

Sky/weather.........Mostly cloudy (65-75 percent). Slight chance of
                    rain showers in the evening, then chance of
                    rain showers late in the evening.
CWR.................0 percent increasing to 31 percent late in the
                    evening, then decreasing to 21 percent early in
                    the morning.
LAL.................1.
Min temperature.....31-34.
Max humidity........88-93 percent.
Wind (20 ft)........West winds 5 to 8 mph shifting to the southwest
                    5 to 7 mph late in the evening, then becoming
                    light early in the morning.
Ridgetop wind.......Northwest wind shifting to the southwest in the evening
                    and increasing to 10 to 15 mph, then shifting back to
                    the west by morning.
Mixing height.......600 ft AGL.
Transport winds.....Southwest 7 to 13 mph.
Haines Index........2 or very low potential for large plume
                    dominated fire growth.

.THURSDAY...

Sky/weather.........Partly sunny (55-65 percent). Chance of rain
                    showers and snow showers in the morning, then
                    slight chance of rain showers and snow showers
                    in the afternoon.
CWR.................21 percent decreasing to 0 percent late in the
                    morning.
LAL.................1.
Max temperature.....52-55.
Min humidity........47-52 percent.
Wind (20 ft)........Light winds becoming northwest 5 to 11 mph late
                    in the morning.
Ridgetop wind.......West winds becoming northwest and decreasing to 5
                    to 10 mph during the afternoon.
Mixing height.......5700 ft AGL.
Transport winds.....West 7 to 12 mph shifting to the northwest 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 2412806.0/PDT
.DELDT 04/30/24
.FormatterVersion 2.0.0
.EMAIL jyota.smithhoward@usda.gov