Squall Line of Severe Thunderstorms Packing Damaging Winds & Hail Likely Sunday

Estimated reading time:1 minute, 31 seconds

        A line of severe thunderstorms associated with an approaching cold front is expected Sunday Afternoon into the Evening across Central and Eastern PA. It will likely come in the form of a squall line or bow echo. One thing that they both have in common, damaging winds.

        Damaging winds will be the main threat Sunday, likely between 58-70mph in storms that are severe. Although mid-levels of the atmosphere will be on the warm side, hail will also be possible in the strongest of storms.

        The line will begin to form in Western PA around noon-time Sunday, but will not begin to become severe until it moves into Central PA, where conditions will be more conducive for potent cells. Furthermore, we are watching the possibility of storms coming up from the Maryland area, into SE PA ahead of this line. These storms have the best chance at forming spin-ups (weak tornadoes). Besides that, the higher tornado threat will remain in Maryland and Virginia.

        We have created a more well thought-out scale. We have also done this to limit the amount of confusion between our page and the SPC. The new key is under our newly updated map below.



        Here is our Main Thunderstorm Risks Graphic, indicating which severe storm element looks most probable.


        Finally, we understand that TIMING matters to many of you so we have created an estimated thunderstorm timing graphic.


        We will be posting all SPC/NWS watches and warnings issued Sunday, so be sure to like our facebook page to stay informed by clicking here. Stay safe everyone!

        If you would like to view the Storm Prediction Center’s Sunday Outlook, click here!

        If you would like to see what the NWS State College has to say about Sunday’s Threat, read below. This is a screenshot from their most recent forecast discussion.

nws sc

Hello, my name is Josh Adams. This year I am a junior in high school in South Central PA. I have had a passion for weather since I was five or six years old, watching the Weather Channel when the average kid my age was watching cartoons. At age 11, I discovered that there is a significant amount of weather info online from knowledgeable meteorologists to weather models and everything in between. I had the privilege to take part in a group that held informational weather discussions nearly everyday. I gained a significant amount of knowledge in several months back in 2012, constantly studying meteorology for hours each and just about every day. I created Northeast Weather Action in early 2013, just after the previous winter had ended. Things were pretty slow to start, however the winter of 2013-2014 greatly helped grow the page. Several of my forecasts verified nicely across the area. I met Chris during that winter in a facebook group, and we talked often about anticipated weather events. Just before the start of the 2014-2015 Winter, I added Chris to Northeast Weather Action (now Pennsylvania Weather Action), and once again we hit several key forecasts. Chris and I are looking forward to giving you the most up to date and reliable forecasts!

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