The heat will build in the coming days. With the humidity and heat, we are probably going to see the combination make it feel like it is close to 100 degrees at times, especially Tuesday, Wednesday and Thursday. During the peak of the heat, it looks like this stretch will bring temperatures a little higher than the heat that built on and for a few days after the Fourth of July.
As for today goes, the moisture trapped in the transition zone will still result in spotty showers, and in the afternoon even a thunderstorm in spots especially in southern Pennsylvania and Maryland. Morning fog will be a problem over eastern New York and Long Island. There could be patchy fog in eastern Pennsylvania and Maryland. The fog should burn off before 10 am. We look for more in the way of sunshine today than yesterday as the light surface flow turns southwest and the building dome of high pressure. Although the building high pressure area will keep most of the day dry, there will be enough moisture lingering in the light overall flow and the building warmth for a stray shower or thunderstorm to pop up, mainly during the afternoon. Some models show a weak surface trough will shift into our are
today (a lee of the Appalachians trough). We will have to see how this plays out as there isn’t much, if any, upper level support with the building high. However, with some of the models insistent that a thin ribbon of moisture combines with warm, humid air and weak surface trough, we cannot totally rule out a shower or thunderstorm today. However, it may be an isolated event that does not detract from the hot, humid and rain-free weather as the flavor of the day for most on today. For Tuesday and Wednesday and probably Thursday, we should just be baking with more sunshine than clouds and not enough of a chance of a stray pop up thunderstorm to even mention. As we head into Friday, the models are showing signs that a front may be approaching from the north and we carry a thunderstorm possible in the afternoon. The front itself may wait to move into the area Saturday for the highest chance.