A day after heavy snowfall made Seattle streets look more like ski runs, freezing rain and accumulating ice shut runways at the city's airport Thursday and made travel even more treacherous.

The National Weather Service issued an ice storm warning for the Seattle-Tacoma metropolitan area, portions of the coastline and the state's southwest interior, including the capital, Olympia.

"An ice storm warning means severe winter weather conditions are imminent or occurring," the weather service said. "Significant amounts of ice accumulations will make travel dangerous or impossible. Travel is strongly discouraged."