Temperatures will sink tonight to the lowest seen yet this winter, and county services have mobilized in response.
Though no more snow is expected, National Weather Service meteorologist Rihaan Gangat said the thermometer may hit 12 degrees tonight.
Tomorrow might be even worse, he said.
"It could get colder than tonight if it clears out, a little less than 12 degrees " he said.
That means Allegheny County's Severe Weather Emergency Shelter is open for business Downtown at Smithfield Unified Church of Christ. Activated when temperatures fall beneath 25 degrees, the shelter has served as many as 130 people in a single night.
On the North Side, the Light of Life shelter reported it was already full.
About 2 inches of snow fell between Monday evening and Tuesday afternoon. More snow is possible late in the week, Gangat said.
Cold weather also brings special risks for pets. The Humane Society advises owners make sure their outdoor pets have covered shelter at night with a raised floor and a shielded entrance.
Owners should also used plastic water bowls instead of metal, as a pet's tongue can stick to metal in low temperatures.
First Published January 1, 2013 11:00 AM