“It takes a period of several days of temperatures that are below freezing for the ice to begin forming on the rivers, which is what we’re seeing now,” he said.īrown said the ice can begin to pose problems when it breaks up quickly, which usually occurs when there are several days of warmer temperatures or rainfall. The recent run of temperatures well below the freezing mark has started to cause area waterways to freeze over, Brown said. Tuesday will be partly sunny and about 21 degrees before dropping down to 5 overnight. on Monday, increasing to 80% overnight with a low of around 25 degrees. There’s a 60% chance of snow showers after 1 p.m. The chance of snow will decrease to 30% overnight, but it will dip to a low of 9 degrees, according to the weather service. Sunday’s forecast calls for an 80% chance of snow with a high temperature of 28. Much of the snow is expected to fall during the earlier part of the day, he said.

“The way it’s looking now we could see brief periods of moderate to heavy snow falling.”īrown said the ground is cold, which means much of the snow that falls will accumulate. “We have a low pressure system moving through the area pretty quickly that is expected to remain for an extended period of time,” said Michael Brown, a meteorologist for the weather service. The National Weather Service in Moon Township issued the winter weather advisory for 7 a.m. Don’t let Saturday’s eye-popping sunshine fool you.īy Sunday morning, Western Pennsylvania will be under a winter weather advisory that will blanket the region with 2 to 4 inches of snow and make driving conditions hazardous.

Pittsburgh weather