Now that many of you have likely heard about this threat whether it was from us several days ago or another weather source, we will skip the overall setup and get into the details.
Storm cells will form Early Sunday Afternoon in the Somerset-Johnstown-Du-Bois region. Strong storms with a few rapidly strengthening severe thunderstorms will be likely within 50 miles of the stated locations.
As cells move east into the State College-Huntingdon-Bedford region during the mid-afternoon, they will have better conditions to work with. As a result, in the mentioned areas, severe thunderstorms will scattered. However, not all locations will see severe storms.
Late Sunday Afternoon into the Early Evening is the period of highest risk. We expect severe storms to be reaching the Chambersburg-Harrisburg-York-Lancaster area during this time. Unfortunately, we predict the severe thunderstorms will be more widespread in nature across this populated region. Damaging winds, large hail, and possibly a few tornadoes are expected in this area as supercells move from west-to-east through the valley.
By Mid-Evening Sunday, severe storms will move into the Reading-Allentown-Philadelphia region. The storms will likely have lost some intensity compared to when they were in the Lower Susquehanna Valley, but will still be relatively widespread in nature. Damaging winds will be the highest threat here.
A threat that applies to all areas is flash flooding. There is the possibility of storm cells “training” over the same areas, which could cause flash flooding due to the already saturated ground. Also, we do not use the SPC’s scale because we feel that one key cannot be used nationwide. For example, those in the Great Plains are much more accustomed to severe thunderstorms than we are here in PA yet the SPC uses the same scale for both areas. We are not here to hype, we are here to warn our followers of the possibilities.
Here is our latest Severe Thunderstorm Risk Map with the key below it, followed by our Main Risks Graphic.
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!