Today we have a cold front entering PA which will slowly come east today and tonight, we have showers and thunderstorms forming along this front. Showers and storms from this cold front will approach and enter the area from around 5-7 pm over western areas to 9-10 over eastern area.
Highs today will be hot and humid with mid 80s to low 90s expected, if you like heat enjoy it because this is the last day of heat we will for a long while.
I do not expect much in the way of severe weather, there’s some modest instability to work with but by far nothing impressive , I expect more in the way of widespread showers and storms, some may be on the stronger side with small hail and gusty winds possible, but the main threat will be heavy rainfall and training storms as the front is slow-moving , and winds at the mid and upper levels of the atmosphere are running parallel to the front
Meanwhile, an area of low pressure will from along the south side of the front, and track Northeast along the coast late tonight through the tomorrow morning, this low will enhance rainfall over most of NJ, NYC, and Long Island as well as Delaware. Showers and storms may last into the early afternoon hours in these areas for your Saturday.
Images below courtesy of Penn State EWALL
Total precipitation expected from tonight through Sunday off the GFS model (NCEP image)
We can clearly see the enhancement of rain along the coast thanks to the coastal low
Clouds and early rain will lead to clearing skies in the late morning over western areas, and clearing in the early to mid afternoon hours over eastern NJ , NYC and late afternoon over Long Island and eastern Connecticut, humidity will rapidly drop and highs in the mid 70s to low 80s are expected as winds veer from SW to NW.
Sunday through Thursday temperatures will remain comfortable and the same with highs in the mid 70s to low 80s and lows in the mid 50s interior to low 60s along the coast. The front will stall along the coast and depending exactly where it stalls, there could be a constant threat of scattered showers for eastern sections, for now I think Canadian high pressure will push the front far enough SE to keep us in the clear.