Synopsis: High pressure that has dominated the region for the last few days will continue to move off the coast.  A strong Upper level low with an associated cold front will move into the region for Thursday and Friday.  Temperatures this weekend will be cool in the wake of this front averaging several degrees below normal. Upper level low will spread scattered instability showers and clouds over the region Saturday. Late weekend and early next week expect a strong high pressure to move in brining mild late October temperatures.

Short term: Thursday –Saturday

Thursday expect a deteriorating weather day across the commonwealth as showers and possible thunderstorms move in from the west in the afternoon hours. Isolated severe storms cannot be ruled out given the dynamics and SPC slight risk area over the majority of PA.  The NAM and GFS both have the region getting a healthy dose of rain between .25-1 inches, but amounts could be higher in thunderstorms.  Friday afternoon the clouds will break some as the trough digs into are region. Saturday the GFS has the upper level low spinning over us, which would bring the coolest conditions of the weekend along with possibility of showers. Expect a strong high pressure to move in for the ladder half of the weekend.

Long term: Sunday – Monday

High pressure will set up off to our south pumping in warm dry air. Temperatures will be well above normal as we head in mid and early next week.  Expect fair weather skies for Sunday and Monday with little in the way of cloud cover.