Though the City of Houston declined to open warming centers during this week's cold snap, several nonprofits are offering resources for Houstonians in need. The big picture: Overnight temperatures must reach 24 degrees (or 15 degrees with a wind chill) for at least two hours for the city to open the centers,

A winter weather advisory is in effect until 4 p.m. Counites under the advisory, including Cook and DuPage counties, can expect 3 to 4 inches of snow with higher amounts of up to 5 inches possible, especially in Lake County, Illinois. High temperatures will be in the 20s with lows in the teens.