Winter Storm Watch Issued for South-Central Pennsylvania
A winter storm is forecast to impact South-Central Pennsylvania beginning Sunday morning and potentially lingering into early Monday. A winter weather advisory is currently in effect for Perry and Cumberland counties, while counties further west, extending towards Philadelphia, have been upgraded to a winter storm warning, effective Sunday morning until 1:00 PM Monday.
The storm is expected to be a moderate impact event, with the potential for heavier snowfall amounts to the east. While the exact track, timing, and snow totals remain uncertain, forecasters anticipate a shift in conditions starting Saturday, moving from a quiet weekend start to a period of potentially hazardous weather.
Initially, light snow is expected to develop across the Susquehanna Valley after midnight Saturday into early Sunday morning. There is a possibility of this precipitation mixing with sleet or rain during the day on Sunday, with surface temperatures likely remaining above freezing, resulting in wet or slushy roads. However, as the sun sets on Sunday, the snow is expected to increase in intensity, becoming moderate to heavy at times and continuing into early Monday, potentially lingering in eastern counties.
Snowfall Predictions
Most of the Susquehanna Valley is predicted to receive between 2 and 5 inches of snow. However, areas south and east of Interstate 81, particularly southern York and Lancaster counties, could see accumulations of 5 to 8 inches. Chester County, under the winter storm warning, is expected to receive locally higher amounts.
Forecasters emphasize that these snowfall predictions are subject to change. The precise location of the heaviest snowfall will depend on the development and track of the low-pressure system off the coast. Models are currently split, with some indicating higher snow totals further inland and others suggesting they will remain closer to the coastline.
Travel Impacts
Daytime commutes on Sunday are likely to be impacted by wet and slushy road conditions. Nighttime travel Sunday into Monday could become more challenging, with the potential for slushy to snow-covered roads and reduced visibility. Plow operations are anticipated if heavier snowfall develops.
Current temperatures across the region range from 39 degrees in Lewistown to 35 degrees in Lancaster. Winds are picking up in Lewistown, contributing to the warmer temperature there. Winds are currently around 6 miles per hour in Carlisle, Lancaster, and Harrisburg.
Looking Ahead
The storm system is currently located off the Gulf Coast and is expected to gather moisture as it moves towards the northeast. Upper-level energy will contribute to the system’s intensification as it moves off the coast of North Carolina. The location where this low intensifies off the Delmarva coast will be crucial in determining the placement of the heaviest snow bands.
The forecast for Monday indicates blustery conditions with temperatures in the low 30s. Partly sunny skies are expected after the storm system pulls away, with the possibility of lake-effect snow showers.
Resources for South-Central Pennsylvania Weather: Interactive Radar | Active Weather Alerts | Current Conditions | Hourly Forecast | 10-Day Forecast | Map Room | Download the App | Weather Emails
Understanding Watches vs. Warnings
It is important to understand the difference between a winter storm watch and a winter storm warning. A watch means that conditions are favorable for severe weather to develop, and residents should have a plan in place. A warning means that severe weather is occurring and action should be taken to protect oneself and property.