Suppression Forecast
Issued by NWS Billings, MT

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FNUS75 KBYZ 251213
FWSBYZ

Spot Forecast for Porcupine Aspen Project Rx...USFS
National Weather Service Billings MT
613 AM MDT Fri May 25 2018

Forecast is based on ignition time of 0800 MDT on May 25.
If conditions become unrepresentative...contact the National Weather
Service.

Please contact our office if you have questions
or concerns with this forecast.

.DISCUSSION...
A ridge of high pressure will build over the burn site today. Weak
disturbances will bring isolated showers and thunderstorms in the
afternoon. It will be partly cloudy tonight. A storm system over Nevada
will bring scattered afternoon showers and thunderstorms to the burn site
Saturday afternoon. Some thunderstorms may produce gusty winds and small hail.
The system will continue affecting the area Saturday night. High temperatures each
day will be 65 to 70 degrees, with humidities in the 30s. Lows tonight will be in
the upper 30s to lower 40s with good humidity recoveries. Expect light terrain-driven
winds today and tonight, with south winds at 5 to 10 mph on Saturday.

.TODAY...

Sky/weather.........Mostly sunny. Isolated rain showers and
                    thunderstorms in the afternoon.
Max temperature.....65-70.
Min humidity........30-35 percent.
Wind (20 ft)........
 Slope/valley.......Downslope/down-valley winds at 5 mph early,
                    becoming upslope/up-valley winds 5 to 10 mph by late morning.
                    Gusty and erratic winds expected near thunderstorms in the
                    afternoon.
 Ridgetop...........Southwest 5 to 15 mph.
Mixing height.......800 ft AGL in the morning...increasing to 7900
                    ft AGL in the afternoon.
Transport winds.....Southwest 5 to 15 mph.
Haines index........3.
CWR.................10 percent.

.TONIGHT...

Sky/weather.........Partly cloudy.
Min temperature.....38-43.
Max humidity........81-86 percent.
Wind (20 ft)........
 Slope/valley.......Upslope/up-valley winds 5 to 10 mph early,
                    becoming downslope/down-valley winds around 5 mph by late
                    evening.
 Ridgetop...........South 15 to 25 mph.
Mixing height.......7900 ft AGL in the evening...decreasing to 700
                    ft AGL overnight.
Transport winds.....South 5 to 15 mph.
CWR.................0 percent.

.SATURDAY...

Sky/weather.........Partly sunny. Scattered thunderstorms in the
                    afternoon. Some thunderstorms may produce gusty
                    winds and small hail in the afternoon.
Max temperature.....65-70.
Min humidity........33-38 percent.
Wind (20 ft)........
 Slope/valley.......South winds 5 to 10 mph. Gusty and erratic
                    winds expected near thunderstorms in the
                    afternoon.
 Ridgetop...........Southwest 5 to 15 mph.
Mixing height.......700 ft AGL in the morning...increasing to 6600
                    ft AGL in the afternoon.
Transport winds.....South 5 to 10 mph.
Haines index........4.
CWR.................31 percent.

.SATURDAY NIGHT...

 Ridgetop...........North 5 to 15 mph.
Mixing height.......6600 ft AGL in the evening...decreasing to 1500 ft
                    ft AGL overnight.
Transport winds.....Northeast 10 to 15 mph.
Haines index........2.




$$
Forecaster...Arthur
Requested by...Cristi Heaney
Type of request...PRESCRIBED
.TAG 1810621.0/BYZ
.DELDT 05/25/18
.EMAIL mtbzc@fs.fed.us



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