Northwest Montana Regional Forecast

Includes Lincoln and Sanders Counties (cities of Libby, Troy, Eureka, Yaak, Bull Lake, Noxon, Heron, Trout Creek, Thompson Falls, and The Cabinet Mountains)

Issued Tuesday September 18, 2018 - 11:30 p.m.

* Next Forecast update won’t be until Tuesday, September 25, 2018 *

Tuesday night...Fair skies and cool. Increasing high clouds towards morning. Lows in the mid 20s to mid 30s except locally near 20 colder valleys and lower 40s on slopes, ridges and around 5000 feet. Light winds except local east to northeast winds 5 to 15 mph along the Kootenai River between Troy and Libby. Ridge top winds east 10 to 20 mph.

Wednesday...Variable cloudiness. Highs in the 60s to near 70 with lower 50s around 5000 feet. Local northeast winds 5 to 15 mph with ridge top winds east 10 to 20 mph decreasing by afternoon.

Wednesday night...Partly cloudy and not as cool. Lows in the 30s to lower 40s except locally upper 20s colder valleys with upper 30s around 5000 feet. Light winds.

Thursday...Variable clouds with a chance of showers north of Noxon to Happys Inn with a slight chance south. Snow level near 7000 feet. A little cooler with highs in the mid 50s to mid 60s with upper 40s around 5000 feet. Local southwest winds 5 to 10 mph.

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Extended Outlook(Friday through Tuesday)

Friday through Tuesday…Unsettled through the period with a chance of valley rain showers and mountain snow showers at times. Lows in the lower 30s to lower 40s with mid to upper 30s around 5000 feet. Highs in the mid 50s to mid 60s with upper 40s around 5000 feet.


In-Depth Weather Discussion for Northwest Montana/Rockies

Issued 09/18/2018 11:30 p.m.

   Another beautiful fall day across Lincoln and Sanders Counties on Tuesday. A bit of a wind shift overnight tonight will give way to another bright and mostly sunny day although there will likely be a few more clouds around on Wednesday. Any precipitation looks to remain well to the south and east of Sanders County and well north and west of Lincoln County. Clouds will increase some on Wednesday night and a weak system will brush by the area on Thursday which will likely bring cooler temperatures and one or two showers. Snow levels will remain near 6500 to 7000 feet with this system so the highest elevations may see a dusting. Thereafter the outlook continues to look a bit messy with models having a difficult time at best in trying to resolve incoming shortwaves and the magnitude of the upper level ridge which continues to plague much of the Western US with persistently dry conditions. The overall trend for the Friday through next Tuesday time frame looks for a continuation of below average temperatures with some chances for precipitation yet nothing really stands out as a definite good rain or mountain snow maker. For those of you waiting for the first good snowfall in the higher elevations to bring the animals down to lower elevations it looks like you may have to wait for another week or so. I will be out of town from Wednesday afternoon September 19th and returning with a forecast update on Tuesday September 25th. For the latest forecasts please see the National Weather Service at or I will update our local forecasts for Lincoln and Sanders Counties on Tuesday September 25th in the early evening.