I-90 Winter Weather Advisory: Up to 12 Inches of Snow Expected Tonight—Drivers Warned of Dangerous Travel

Drivers along I-90 in western Montana face the season’s first true taste of winter this weekend as the National Weather Service has issued a Winter Weather Advisory from 6 p.m. Saturday through 6 p.m. Sunday. Forecasters expect up to 3 inches of snow and wind gusts to 35 mph on the East Missoula-to-Bearmouth stretch, with similar conditions on connecting mountain passes such as Lolo Pass and Lost Trail Pass. What to expect • Timing: Snow arrives Saturday evening, intensifies overnight and tapers late Sunday. • Accumulation: Most valley floors will see a slushy inch or two, while higher elevations near the pass summits could top out around 3 inches. • Wind: Southwest winds may gust to 35 mph, producing brief whiteout pockets and blowing snow across open stretches. Travel impacts on I-90 Even light early-season snow can quickly turn the canyon-hugging interstate slick, especially on shaded curves after sunset. The Montana Department of Transportation warns that speed reductions, chain controls for commercial rigs and intermittent closures are possible if conditions deteriorate. Motorists should check 511 before departure and carry an emergency kit with blankets, traction sand and a fully charged mobile phone. Early-season cold snap This advisory follows an unseasonably warm start to October; pavement temperatures are still relatively mild, meaning slush will refreeze overnight. Any melt-and-refreeze cycle can create black ice on bridges and exit ramps. Tall vehicles and drivers towing campers should brace for buffeting cross-winds over the Clark Fork River flats. Tips for safe passage 1. Slow down 5-10 mph below the posted limit on curves and grades. 2. Keep headlights on at all times to improve visibility in blowing snow. 3. Maintain at least eight seconds of following distance behind snowplows—never pass on the right. 4. Top off washer fluid with a winter blend to prevent streaking. 5. For long-haul truckers, verify that tire chains meet Montana DOT specifications before the storm hits. Looking ahead Forecasters say this system is a one-two punch: a Pacific cold front Saturday followed by a reinforcing wave Sunday morning. After the advisory expires, temps should rebound to the mid-40s early next week, melting residual snow on the roadway. Nevertheless, the event signals a fast-approaching winter pattern across the Northern Rockies. Bottom line If your weekend plans take you over I-90 between Missoula and Bearmouth—or through adjacent passes—leave early, drive defensively and monitor real-time updates from the National Weather Service and Montana DOT. A few inches of well-timed snow, combined with gusty winds, can turn a routine autumn trip into a treacherous trek.