364
FNUS76 KOTX 271019
FWSOTX

Spot Forecast for Porcupine...USFS
National Weather Service Spokane WA
319 AM PDT Mon Jul 27 2026

Forecast is based on forecast start time of 0600 PDT on July 27.
.DISCUSSION...

Dry conditions with light winds at the fire today and tomorrow.
Exposed ridgetops will have west-southwest winds 20-25 mph this
afternoon, and potentially 25-30 mph Tuesday afternoon. RH
recovery overnight into Tuesday will be poor. No rain expected
the next 7 days. Continuing to monitoring Saturday (Aug 1)
afternoon for a strong cold front passage.

If conditions become unrepresentative, contact the National Weather
Service.
***************************************************************
Forecasts for 20 foot wind speeds (valleys and ridge tops) are
10 minute averages reflecting RAWS wind.
***Ventilation Index is derived from transport wind
   multiplied by the mixing height divided by 100.
   Categories: low (< 200), moderate (200-500),
   high (500-800), and very high (> 800).
***************************************************************

.TODAY...

Sky/weather.........Mostly sunny. Patchy haze and smoke.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....Around 72.
Min humidity........32-37 percent.
Wind (20 ft)........Light variable winds through 1100 hours, then
                    west winds 2 to 5 mph. West winds 20 to 25 mph
                    across exposed ridgetops.
Mixing height.......3500 ft AGL increasing to 5000 ft AGL in the
                    afternoon.
Transport winds.....Southwest 9 to 13 mph.
Ventilation Index...Moderate (345) increasing to high (607) in the
                    afternoon.

.TONIGHT...

Sky/weather.........Clear.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....Around 56.
Max humidity........47-52 percent.
Wind (20 ft)........West winds 2 to 5 mph through 2000 hours, then
                    becoming southeasterly 2 to 4 mph.
Mixing height.......4000 ft AGL falling to 500 ft AGL.
Transport winds.....Southwest 6 to 7 mph.
Ventilation Index...Moderate (398) decreasing to low (23)
                    overnight.

.TUESDAY...

Sky/weather.........Sunny.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....Around 72.
Min humidity........39-44 percent.
Wind (20 ft)........Light variable winds through 0900 hours, then
                    becoming west 2 to 5 mph. West winds 20 to 25 mph
                    across exposed ridgetops.
Mixing height.......4500 ft AGL increasing to 7000 ft AGL in the
                    afternoon.
Transport winds.....Southwest 8 to 16 mph.
Ventilation Index...Moderate (427) increasing to very high (1032)
                    in the afternoon.

$$
Forecaster...PP
Requested by...Crystal Taylor
Type of request...WILDFIRE
.TAG 2618210.5/OTX
.DELDT 07/27/26
.FormatterVersion 2.0.0
.EMAIL idcdc@firenet.gov