First Call Snowfall Forecast for Monday Night into Tuesday’s Winter Storm

Posted by By January 23, 2021

After going three weeks without any widespread winter weather to talk about in January, we are finally expecting a moderate winter storm. A weakening low pressure system coming from the Great Plains will bring a wintry mix of precipitation to the state, starting Monday evening and continuing into Tuesday for many.

Travel disruptions are expected in central and eastern PA Monday Night through early Tuesday afternoon. The Monday evening commute should be clear in all areas, but the Tuesday morning commute will be hazardous in many locations.




STORM TIMING

Precipitation will move into southern Pennsylvania late Monday evening. It will fall as snow in south-central PA, sleet and freezing rain in the Laurel Highlands, and plain rain west of the mountains in southwest PA. Snowfall rates of 1/2″ an hour are expected, with temperatures dropping into the lower 20s as precipitation begins. Below is the NAM model future radar for 7:00 PM Monday.

Snow will continue to push east-northeast across the state early Tuesday morning. At the same time, snow is expected to switch to a brief period of sleet and then freezing rain in our south-central counties. An extended period of freezing rain will likely lead to significant ice accumulations in the Laurels. Here is future radar for 1:00 AM Tuesday.




Snow will weaken Tuesday morning as it tries to move toward a high pressure setup to our northeast, leaving us with some leftover light snow showers by mid-Tuesday morning. Once again, the Tuesday morning commute does look slippery to hazardous in much of central and eastern PA. Below is future radar for 7:00 AM Tuesday.

Some snow may linger in northeast PA into Tuesday evening, but all other regions should be done.




FIRST CALL SNOWFALL FORECAST FOR MONDAY NIGHT – TUESDAY

Area A: Snowfall accumulation of 2 – 5″ expected. Snow will push in from southwest to northeast. Worst travel conditions are likely late Monday evening through mid-Tuesday morning.

Area B: Snowfall accumulation of 1 – 2″ anticipated. Slippery travel possible late Monday night until just before dawn Tuesday.

Locations within the purple shaded region are also likely to receive a tenth to a quarter-inch of ice accumulation.

We are still 60 to 72 hours out from this storm (when this was posted), so be sure to stay tuned on Sunday for our Second Call for any changes that may be needed.

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Don’t forget to share the latest forecast with your family and friends who will be impacted by this storm using the blue button below, stay safe!

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Josh has been passionate about weather as long as his memory dates! From watching the Weather Channel at age 7, to making hand-drawn hurricane maps at age 11, starting his first weather site at 13, and founding PWA at 15 and forecasting for the state for the past 9 years, Josh's interest in weather has never dwindled! As difficult as it is, he greatly enjoys forecasting for Pennsylvania due to its countless microclimates. The state is an East Coast severe weather hotspot and nearly always home to the rain/snow line during winter storms!
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