836
FNUS76 KPDT 180452
FWSPDT

Spot Forecast for Rocky 79...USFS
National Weather Service Pendleton OR
952 PM PDT Fri May 17 2024

Forecast is based on ignition time of 0000 PDT on May 18.
***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 couple weak weather systems will pass over the region
through the weekend and bring light precipitation to the Cascade crest
Saturday evening through Sunday, though dry conditions are forecast
at the burn site. Westerly winds gusting 15-25 mph are anticipated
Saturday afternoon.

.REST OF TONIGHT...

Sky/weather.........Mostly clear (20-30 percent).
CWR.................0 percent.
LAL.................1.
Min temperature.....39-42.
Max humidity........74-79 percent.
Wind (20 ft)........West 5-7 mph becoming variable 2-5 mph.
Ridgetop wind.......West 5-7 mph becoming variable 2-5 mph.
Mixing height.......Decreasing to 800-900 ft AGL overnight.
Transport winds.....West 6-8 mph.
Haines Index........2 to 3 or very low potential for large plume
                    dominated fire growth.

TIME (PDT)      MIDNGT 2 AM   4 AM   6 AM   8 AM   10 AM
Temp............47     44     41     41     45     53
RH..............59     65     72     68     58     43
20 ft wind......W 6    W 6    W 6    W 5    N 7    N 7
20 ft wind gust.8                    6      11     11

.SATURDAY...

Sky/weather.........Sunny (15-25 percent).
CWR.................0 percent.
LAL.................1.
Max temperature.....61-64.
Min humidity........27-32 percent.
Wind (20 ft)........Variable winds 2-5 mph in the morning, becoming
                    west winds 8-12 mph, gusting 15-25 mph afternoon.
Ridgetop wind.......Variable winds 2-5 mph in the morning, becoming
                    west winds 8-12 mph, gusting 15-25 mph afternoon.
Mixing height.......Increasing to 5000-5500 ft AGL late morning
                    and afternoon.
Transport winds.....West 6-8 mph in the morning, increasing to
                    15-20 mph in the afternoon.
Haines Index........2 to 3 or very low potential for large plume
                    dominated fire growth.

.SATURDAY NIGHT...

Sky/weather.........Mostly clear (10-20 percent).
CWR.................0 percent.
LAL.................1.
Min temperature.....37-40.
Max humidity........77-82 percent.
Wind (20 ft)........Becoming west to northwest 2-5 mph late evening
                    and overnight.
Ridgetop wind.......Becoming west to northwest 2-5 mph late evening
                    and overnight.
Mixing height.......Decreasing to 800-900 ft AGL overnight.
Transport winds.....West 15-20 mph in the early evening, decreasing to
                    7-9 mph late evening and overnight.
Haines Index........2 to 3 or very low potential for large plume
                    dominated fire growth.

.SUNDAY...

Sky/weather.........Sunny (10-20 percent).
CWR.................0 percent.
LAL.................1.
Max temperature.....57-60.
Min humidity........37-42 percent.
Wind (20 ft)........Variable winds 2-4 mph in the early morning,
                    becoming west-northwest 5-8 mph. Gusts up to 15 mph
                    late morning and afternoon.
Ridgetop wind.......Variable winds 2-4 mph in the early morning,
                    becoming west-northwest 5-8 mph. Gusts up to 15 mph
                    late morning and afternoon.
Mixing height.......Increasing to 6000-6500 ft AGL late morning
                    and afternoon.
Transport winds.....Northwest 8-12 mph.
Haines Index........2 to 3 or very low potential for large plume
                    dominated fire growth.

$$
Forecaster...Plunkett
Requested by...Andrew Bellairs
Type of request...PRESCRIBED
.TAG 2414537.0/PDT
.DELDT 05/18/24
.FormatterVersion 2.0.0
.EMAIL Richard.lancaster@usda.gov,andrew.s.bellairs@usda.gov