476
FNUS76 KPDT 131147
FWSPDT

Spot Forecast for Ahtanum Medowbrook RX...Yakama Agency
National Weather Service Pendleton OR
447 AM PDT Thu Jun 13 2024

Forecast is based on ignition time of 0800 PDT on June 13.
***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...Warm, dry weather is forecast today, followed by
a sharp transition to gusty northwest winds this evening between
7-8PM as a cold front sweeps across the region. Overnight RH recovery
is anticipated to be moderate tonight. Friday, dry northwest winds
will prevail with seasonal temperatures behind the front.

.REST OF TODAY...

Sky/weather.........Mostly sunny (35-45 percent).
CWR.................0 percent.
LAL.................1.
Max temperature.....83-86.
Min humidity........11-16 percent.
Wind (20 ft)........Light drainage (downslope, downvalley) winds
                    2-5 mph very early, becoming upvalley and upslope
                    by mid-morning before shifting to the
                    south 4-6 mph late in the morning, then shifting
                    to the southwest 3-6 mph late in the afternoon.
Mixing height.......Increasing to 6200-6700 ft AGL by afternoon.
Transport winds.....Light winds becoming south then southwest 5-9 mph
                    by late morning and afternoon.
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............58     68     74     79     82     82
RH..............35     26     21     16     16     18
20 ft wind......SW 3   N 4    S 4    S 4    S 4    SW 6
20 ft wind gust.              6      8      8      10

.TONIGHT...

Sky/weather.........Mostly cloudy (55-65 percent) then becoming
                    partly cloudy (30-40 percent) then becoming
                    mostly clear (5-15 percent).
CWR.................0 percent.
LAL.................1.
Min temperature.....49-52.
Max humidity........49-54 percent.
Wind (20 ft)........Shifting to the northwest 9-14 mph by 7-8 PM,
                    gusting 15-25 mph.
Mixing height.......Decreasing to 500-700 ft AGL in the evening and overnight.
Transport winds.....Shifting to the north 10-15 mph early in the evening.
Haines Index........3 to 4 or very low to low potential for large
                    plume dominated fire growth.

.FRIDAY...

Sky/weather.........Mostly sunny (30-40 percent) then becoming
                    mostly cloudy (70-80 percent).
CWR.................0 percent.
LAL.................1.
Max temperature.....74-77.
Min humidity........17-22 percent.
Wind (20 ft)........Northwest winds 6-11 mph, gusting 12-17 mph.
Mixing height.......Increasing to 7600-8100 ft AGL by afternoon.
Transport winds.....Northwest 10-15 mph.
Haines Index........3 to 4 or very low to low potential for large
                    plume dominated fire growth.

$$
Forecaster...Plunkett
Requested by...Dolores Moore
Type of request...PRESCRIBED
.TAG 2416058.0/PDT
.DELDT 06/13/24
.FormatterVersion 2.0.0
.EMAIL dolores_moore@yakama.com