602
FNUS76 KOTX 192316
FWSOTX

Spot Forecast for Pioneer...NPS
National Weather Service Spokane WA
416 PM PDT Thu Sep 19 2024

Forecast is based on forecast start time of 0800 PDT on September 20.
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...

Breezy northwest winds will continue for the Pioneer Fire through
Friday behind a cold front passage. Dry conditions into Friday night
with fair overnight relative humidity recovery. Additional weather
systems over the weekend will bring increasing clouds and possibly
some light rain on Sunday, but wetting rains are looking unlikely. A
ridge of high pressure will build in early next week allowing
temperatures to warm above normal.

.FRIDAY...

Sky/weather.........Sunny.
CWR.................0 percent.
LAL.................1.
Max temperature.....1100 ft elevation: 73 near the lake.
                    6000 ft elevation: 50 near ridge top.
Min humidity........1100 ft elevation: 19 percent.
                    6000 ft elevation: 37 percent.
Wind (20 ft)........Northwest winds 7 to 15 mph with gusts up to
                    25 mph. Strongest winds on ridge tops and
                    along Lake Chelan. For steep south to north
                    drainages, winds locally downslope/downvalley
                    5 to 10 mph in the morning then upslope-
                    upvalley 4 to 8 mph.
Mixing height.......Near surface through 1000 PDT increasing to
                    3000 ft AGL in the afternoon.
Transport winds.....Northwest 12 to 17 mph.
Haines Index........4 Low.

.FRIDAY NIGHT...

Sky/weather.........Clear.
CWR.................0 percent.
LAL.................1.
Min temperature.....1100 ft elevation: 45 near the lake.
                    6000 ft elevation: 35 near ridge top.
Max humidity........54-68 percent. Highest recoveries ridge tops.
Wind (20 ft)........Northwest winds 5 to 7 mph on ridge tops.
                    Downslope/Downvalley 4 to 6 mph mid slopes
                    to valleys, except northwest along Lake
                    Chelan.
Mixing height.......Near the surface.
Transport winds.....Downslope/Downvalley 6 to 8 mph.
Haines Index........4 Low.

.SATURDAY...

Sky/weather.........Mostly sunny. High cirrus clouds in the
                    afternoon.
CWR.................0 percent.
LAL.................1.
Max temperature.....1100 ft elevation: 79 near the lake.
                    6000 ft elevation: 57 near ridge top.
Min humidity........1100 ft elevation: 17 percent.
                    6000 ft elevation: 33 percent.
Wind (20 ft)........Upslope/Upvalley winds 4 to 8 mph by 1000 PDT.
                    Winds becoming west-northwest along Lake Chelan
                    after 1500 PDT.
Mixing height.......Increasing to 3500 ft AGL in the afternoon.
Transport winds.....Northwest 5 to 9 mph.
Haines Index........3 Very Low.

.SATURDAY NIGHT...

Sky/weather.........Mostly clear in the evening. Clouds increasing
                    early Sunday morning.
CWR.................0 percent.
LAL.................1.
Min temperature.....1100 ft elevation: 51 near the lake.
                    6000 ft elevation: 39 near ridge top.
Max humidity........57-72 percent. Highest recoveries ridge tops.
Wind (20 ft)........Downslope/Downvalley winds 3 to 6 mph.
Mixing height.......Near the surface.
Transport winds.....Downslope/Downvalley 3 to 6 mph.
Haines Index........4 Low.

$$
Forecaster...SVH
Requested by...Geoff Hibbs
Type of request...WILDFIRE
.TAG 2422366.7/OTX
.DELDT 09/19/24
.FormatterVersion 2.0.0
.EMAIL geoff_hibbs@nps.gov,sofia_ecker@nps.gov,zachary_w_allen@nps.gov,anna_valentine@nps.gov,teague_walsh-felz@nps.gov