751
FNUS76 KPDT 232216
FWSPDT

Spot Forecast for Rainwater Rx...Bureau of Indian Affairs - Umatilla Agency
National Weather Service Pendleton OR
316 PM PDT Mon Sep 23 2024

Forecast is based on ignition time of 1000 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 impact the region through
Wednesday night, with winds increasing ahead of the cold front
passage in the morning. Current expected arrival time of the
front is between 3 to 6PM, with winds increasing and shifting
to the west behind the front. Light rain showers will impact
the site as well Wednesday, with chances of wetting rain less
than 30%.

.WEDNESDAY...

Sky/weather.........Mostly sunny (20-30 percent) then becoming
                    mostly cloudy (70-80 percent). Slight chance of
                    showers late in the morning. Chance of showers
                    late in the afternoon. Patchy blowing dust late
                    in the afternoon.
CWR.................0 percent increasing to 29 percent late in the
                    afternoon.
LAL.................1.
Max temperature.....Around 80.
Min humidity........28-33 percent.
Wind (20 ft)........South winds 7 to 12 mph shifting to the
                    southwest 12 to 17 mph after 10AM.
Ridgetop wind.......South winds 10 to 15 mph shifting to the
west 17 to 25 mph after 11AM.
Mixing height.......4100 ft AGL late in the morning.
Transport winds.....Southwest 10 to 18 mph shifting to the west
                    around 23 mph late in the afternoon.
Haines Index........3 or very low potential for large plume
                    dominated fire growth.

TIME (PDT)      10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM 9PM
Temp............72  75  76  76  75  73  70  67  64  61  59  57
RH..............35  32  32  33  36  40  45  50  56  62  67  70
20 FT wind dir..S   SW  SW  SW  SW  SW  SW  W   W   W   W   W
20 FT wind spd..12  12  12  12  14  14  14  17  17  17  20  20
20 FT wind gust.14  13  13  13  18  18  18  20  20  20  24  24

.WEDNESDAY NIGHT...

Sky/weather.........Mostly cloudy (65-75 percent) then becoming
                    mostly clear (15-25 percent). Patchy blowing
                    dust early in the evening. Chance of rain
                    showers.
CWR.................29 percent decreasing to 5 percent late in the
                    evening.
LAL.................1.
Min temperature.....46-49.
Max humidity........73-78 percent.
Wind (20 ft)........West winds 10 to 20 mph shifting to the
southwest after 11PM.
Ridgetop wind.......West winds 17 to 25 mph shifting to the
southwest 12 to 20 mph after 7PM
Mixing height.......1000 ft AGL in the evening.
Transport winds.....Southwest 15 to 23 mph.
Haines Index........2 to 4 or very low to low potential for large
                    plume dominated fire growth.

.THURSDAY...

Sky/weather.........Sunny (5-15 percent).
CWR.................0 percent.
LAL.................1.
Max temperature.....62-65.
Min humidity........35-40 percent.
Wind (20 ft)........Southwest winds 5 to 12 mph shifting to the
                    west 5 to 8 mph after 12PM.
Ridgetop wind.......Southwest winds 10 to 17 mph becoming
5 to 10 mph after 11AM.
Mixing height.......3500 ft AGL early in the morning.
Transport winds.....Southwest 10 to 15 mph.
Haines Index........3 to 4 or very low to low potential for large
                    plume dominated fire growth.

$$
Forecaster...Lawhorn
Requested by...Tristan Spencer
Type of request...PRESCRIBED
.TAG 2422928.0/PDT
.DELDT 09/23/24
.FormatterVersion 2.0.0
.EMAIL tristan.spencer@bia.gov