***Evening Update by Kurt Aaron***
The clouds are clearing out as the temperature drops into the lower 60s. High pressure sitting over us will ensure tomorrow will be another hot day! The next chance for widely scattered showers comes Thursday followed by slightly cooler air for the weekend. As mentioned below, We are experiencing above average temperatures however it’s not a record-breaking heat wave. The average high on September 1st is 77°. The average high by the end of the month is down to 66°. The average low goes from 57° to 46° and we lose almost 80 minutes of sunshine. This month is clearly the month of change.
We won’t be breaking any high temperatures records here this week but for sure the high humidity will is making it feel hotter than it really is. The record high for today is 97 set back in 1932. We got to 88. For tomorrow it’s 99 set in 1953. That was the year when the first 4 days in September were 95, 99, 100 and 91.
I see only a 10 percent chance tomorrow. On Thursday and Friday the chance will increase up to 30% and 40% when a ‘back door’ cold front delivers scattered showers and slightly cooler weather to end the week. This will be most noted over eastern PA. These back door fronts sneak down from New England as a shallow push of cooler air from the east.
A ridge of high pressure will strengthen over PA this weekend and this will serve to stabilize the atmosphere keeping the probability of showers very low heading into Labor day.
A strong cold front will plow thru Tuesday evening from the west followed by a Canadian air mass in town for Wednesday and Thursday.