Despite some intermittent cloud cover throughout the day we still squeezed out a high of 93 at Philly International this afternoon after a low of 72. There were some showers and thunderstorms to the west in the afternoon, but fell apart once the sun set; overnight lows will be in the lower 70s with some clouds due to the debris from the collapsing storms.
Wednesday will be hazy, hot, and humid with highs in the middle 90s; there is a Heat Advisory in effect for the entire city along with most counties within the area from Noon until 8pm Wednesday afternoon. This is because combined with a dewpoint into the lower 70s the heat index will feel closer to 100 degrees! Of course if you need to be outdoors for an extended period of time be sure to wear light colored "breathable" clothing, take frequent breaks, and drink plenty of fluids(preferably water). There will be some strong to severe thunderstorms popping up in the afternoon in response to a potent cold front that will be pushing eastward and some thunderstorms can contain gusty winds, small hair, and dangerous cloud-to-great lightning.
The showers and thunderstorms will continue overnight with lows in the lower 70s while Thursday will feature more showers and thunderstorms as the front stalls out on top of us; it will remain humid with highs in the lower 90s. The front finally allows some cooler air to push in overnight into Friday so although we'll have morning showers for the Fourth of July we'll be into the middle 80s with clearing by the afternoon.
Luckily the cold front acts like a boundary as it will help push Tropical Storm Arthur to the east so we won't have to deal with strong winds, BUT we'll still have rough surf for Friday and Saturday however. The weekend is dry and seasonable with highs ranging from the lower to middle 80s with lots of sunshine.
Remember that you can check out the rest of the 7-day forecast(any time) at www.scottderekwx.com/forecast.html.