Suppression Forecast
Issued by NWS Great Falls, MT

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476
FNUS75 KTFX 262000
FWSTFX

Spot Forecast for Helmville RX...Helena-Lewis and Clark National Forest
National Weather Service Great Falls MT
200 PM MDT Thu Apr 26 2018

Forecast is based on ignition time of 1400 MDT on April 26.
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...
High pressure will keep the area mostly clear and dry through Friday
night with warmer than normal temperatures. Winds will be light and
terrain-driven tonight, but an approaching Pacific cold front will
cause more consistent easterly winds Friday into Friday night. The
cold front will move through the area on Saturday, shifting winds
more westerly during the afternoon and causing scattered thunderstorms
with gusty erratic winds.

.TONIGHT...

Sky/weather.........Clear.
CWR.................0 percent.
LAL.................1.
Min temperature.....30-35.
Max humidity........55-60 percent.
Wind (20 ft)........
 Slope/valley.......Light and variable winds increasing to east (down
                    slope) at 4 to 7 mph by midnight.
Mixing height.......5000 ft AGL decreasing to 500 ft AGL after
                    midnight.
Transport winds.....South around 5 mph.

.FRIDAY...

Sky/weather.........Sunny.
CWR.................0 percent.
LAL.................1.
Max temperature.....70-75.
Min humidity........15-20 percent.
Wind (20 ft)........
 Slope/valley.......East winds around 10 mph. Gusts to 20 mph
                    possible in the afternoon.
Mixing height.......500 ft AGL increasing to 4000 ft AGL in the
                    afternoon.
Transport winds.....East around 10 mph.
Haines index........3 very low.

.FRIDAY NIGHT...

Sky/weather.........Mostly clear.
CWR.................0 percent.
LAL.................1.
Min temperature.....40-45.
Max humidity........70-75 percent.
Wind (20 ft)........
 Slope/valley.......East winds 5 to 10 mph.
Mixing height.......4000 ft AGL decreasing to 500 ft AGL after
                    midnight.
Transport winds.....Southeast around 10 mph.

.SATURDAY...

Sky/weather.........Partly sunny. Scattered showers and
                    thunderstorms in the afternoon.
CWR.................10 percent.
LAL.................3.
Max temperature.....67-72.
Min humidity........30-35 percent.
Wind (20 ft)........
 Slope/valley.......Southeast winds around 5 mph increasing to the
                    west at 5 to 10 mph in the afternoon with gusts
                    to 20 mph possible. Gusty and erratic winds
                    expected near thunderstorms in the afternoon.
Mixing height.......500 ft AGL increasing to 3000 ft AGL in the
                    afternoon.
Transport winds.....Southwest around 5 mph.
Haines index........4 low.

$$
Forecaster...Coulston
Requested by...Jarel Kurtz
Type of request...PRESCRIBED
.TAG 1808009.0/TFX
.EMAIL jkurtz@fs.fed.us,jrussell@fs.fed.us



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