Tuesday, June 11, 2013

New Thoughts On Wednesday Night - Friday Morning Rain Event

          Yesterday parts of the region received moderate rain all day, like in New England. Meanwhile other sections of the region like Northern Maryland, dealt with tornadoes. Today scattered showers and thunderstorms will be throughout the area. Don't forget about last week's rain from what was Tropical Storm Andrea, or the remnants of it. So with all of this rain, can we possibly expect more. After all, cities like New York City are having one of the top 10 wettest June's of all time, and we are only a third of the way into the month.

          This answer to the previous question is yes, do to the active pattern that is constantly tracking storms through the Midwest and Ohio Valley, straight into the Northeast. Now lets get to details on this rainstorm. Showers and thunderstorms Wednesday afternoon across Western PA and New York, as well as Central and Northern Ohio could be severe, with possibly a derecho, which is a long line of severe thunderstorms that cause widespread amounts of damage. This name might seem very familiar to you. It would at around this time last year, two derechos swept through Ohio and from Harrisburg, PA to Richmond, Virginia. These prompted long lasting power outages. Which did not mix the the heat wave we experienced shortly after derechos.

          After Wednesday, a low pressure system will approach the region Thursday Morning, shortly after, still likely during Thursday Morning, the storm system will push into Northern Ohio and into Western PA. Heavy is likely to fall, especially on the northern side of the system, which is being indicated on the new models. This. is causing the forecast to change drastically and could still go either way, and could just be a trend that could change. After the rainfall moves into Western PA and Western New York, it will move into Eastern New York as well as Central and Eastern Pennsylvania by around the early afternoon hours on Thursday. 

          The system is actually looking pretty intense, being forecasted a 997 MB storm in Southeastern PA. When Friday Morning rolls around, the area of low pressure will likely be around Long Island, or just south of it. The rain extent should reach up through Southern New England and into Central New England. Now the southern end of the rain is still more out there, or unknown. On the model I am about to show you, you will see what I am talking about. Here is the new 00z GFS for late Thursday Night, with the low centered in Southeastern PA.

          As you can see, it's clear the majority of the rainfall produced by this storm in on the northern side of the system. This is the variable that still has many possibilities but is now becoming more certain. Many models are now showing this solution, so the forecast has changed greatly and looks to be holding throughout the most recent model forecasts. Keep tuned into Northeast Weather Action for the latest rainfall forecasts on this storm. Also stay here because many more storms are coming our way, take my word when I say that. For now I will leave you with the new rainfall forecast for Wednesday Night through Friday at around of just before noon. Thanks for reading!

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