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.

Another round of snow will sweep across New York City Tuesday evening, bringing frosty accumulation to ground still speckled with patches of ice. Bill Goodman, a meteorologist with the National Weather Service,