Portland’s string of cold but sunny days is finally coming to an end. Starting early Thursday morning, a “mess of wintry precipitation” is probable — first falling as snow, then transitioning to a less fun mix of sleet and freezing rain. Icy roads will likely affect afternoon commutes, and slippery conditions could last through the weekend.

Portland-area agencies are fueling their snowplows, pre-treating roads and preparing to work around the clock in anticipation of forecasted freezing temperatures and precipitation that may wallop the region starting Thursday morning.