Suppression Forecast
Issued by NWS Portland, OR

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Spot Forecast for Spirit Lake Tunnel Project...US Forest Service
National Weather Service Portland OR
829 AM PDT Fri Sep 20 2019

Forecast is based on forecast start time of 0000 PDT on September 23.
If conditions become unrepresentative...contact the National Weather
Service Portland, Oregon office.

.DISCUSSION...A front will move through on Sunday, bringing another
round of steady rainfall to the region. It then appears that there will
be at least one dry on Monday as high pressure briefly builds over
the region. As recently as a couple of days ago, it was looking like
the first half of next week would be mainly dry and relatively warmer.
However, the latest model trends are toward bringing additional light
rain to the region on Tuesday, and again potentially on Wednesday.
At the very least, both days look like they will feature
low clouds and reduced visibilities. A more pronounced low pressure
system is likely to arrive late next week, bringing more rain
chances, more clouds, and much cooler temperatures.

.MONDAY...

Sky/weather.........Mostly cloudy in the morning, then becoming
partly sunny in the afternoon.
Chance of pcpn......10 percent.
Max temperature.....55-60.
Min humidity........60-70 percent.
Surface winds.......West winds 4 to 8 mph with gusts to 15 mph.
Transport winds.....Northwest at around 8 mph.
Rainfall amount.....0.00 inches.
CEILING (KFT).......Less than 1000 feet AGL in the morning.
Visibility..........Less than 1 mile in the morning, improving to
nearly unlimited in the afternoon.

.MONDAY NIGHT...

Sky/weather.........Partly cloudy. A slight chance of rain.
Chance of pcpn......30 percent.
Min temperature.....45-50.
Max humidity........90-95 percent.
Surface winds.......West winds 4 to 8 mph in the evening becoming
                    drainage less than 5 mph.
Transport winds.....
Rainfall amount.....0.00 inches.
CEILING (KFT).......Around 5000 ft AGL early, gradually lowering
overnight.
Visibility..........Greater than 6 miles early, but potentially
dropping to 1 to 3 miles late.

.TUESDAY...

Sky/weather.........Mostly cloudy. A chance of rain.
Chance of pcpn......50 percent.
Max temperature.....57-62.
Min humidity........75-80 percent.
Surface winds.......West winds 5 to 10 mph with gusts to 20 mph.
Transport winds.....Southwest 10 to 15 mph.
Rainfall amount.....0.10-0.25 inch possible.
CEILING (KFT).......Less than 1000 ft AGL.
Visibility..........1 to 3 miles.

.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY...
Mostly cloudy. A chance of rain. Lows 44 to 49. Highs 57 to 62.
Northwest winds 5 to 8 mph. Minimum humidity 70-80 percent.
.THURSDAY...
Mostly cloudy with a chance of rain. Lows 42 to 47. Highs 53 to
58. West winds 3 to 6 mph. Minimum humidity 65-75 percent.
.FRIDAY...
Mostly cloudy with a chance of rain. Lows 41 to 46. Highs 50 to
55. West winds 3 to 6 mph. Minimum humidity 65-75 percent.

$$
Forecaster...Pyle
Requested by...Brandon Poe
Type of request...OTHER
.TAG 1915815.0/PQR
.DELDT 09/20/19
.FormatterVersion 1.0.26
.EMAIL chris.strebig@usda.gov,michelle.d.king@usda.gov,waccc@usda.gov


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