Our active start to Winter 2019-2020 will continue this week with a new storm system set to bring snow, sleet and freezing rain from St. Louis to Boston and down towards the I-95 corridor.
The storm we’re tracking is currently bringing steady snow and a bag of mixed precipitation to the center of the country, with St. Louis in the thick of it this afternoon. Heavy rain and severe storms sparking up to the south – Where the threat for tornadoes is high this afternoon and evening – Will continue pushing north and east today and tonight. Enough cold air in place to the north will turn this batch of heavy precipitation from wet to frozen.
A thin strip of snow and freezing rain will move across Illinois, Indiana and Ohio where a few inches of snowfall will be possible later today and tonight. The bulk of our storm system though will impact the Northeast beginning tonight and heading into the day on Tuesday. Warm air and heavy precipitation surging north overnight tonight will result in a heavy wintry mix of snow, sleet and freezing rain across all of Pennsylvania, northern New Jersey, southern New York and Connecticut.
Warm air will turn frozen precipitation into rain across coastal sections along the I-95 corridor overnight tonight and into tomorrow morning, but colder air at the surface will likely stay in place for an extended period of time across parts of eastern Pennsylvania, northern New Jersey and Connecticut. This region is where we are most concerned about a moderate to signifiant freezing rain event that could last well into the day on Tuesday. A similar setup is likely for higher elevations of central and southern Pennsylvania as well as interior sections of Maryland and northeastern Western Virginia.
On the very northern fringe of our storm system, enough cold air should be in place at all levels of the atmosphere that mostly snow will fall. The heaviest precipitation should remain to the south though, leading to only moderate snow totals between 2 and 4 inches – Can’t rule out some areas picking up a quick 5 to 6 inches, especially places just north of the freezing rain.
By late Tuesday our storm will move out of the region, leaving behind frigid air and an elevated threat for snow squalls. Some additional snowfall accumulation will be possible during the day on Wednesday.