Forecast for Sunday, June 26, 2011

Cumulus clouds early this evening will dissipate with the loss of daytime heating. Skies should become clear across the entire region. An area of high pressure to our north will control our weather for Sunday, providing dry weather conditions. Skies should be mostly sunny with perhaps a few afternoon cumulus clouds appearing. On Sunday Night, a few cirrus clouds could enter the picture, moving up from the south.

On Monday, the cold front responsible for pushing out the high humidity from late this week will return northward as a warm front. The front may take a great deal of time pushing through the forecast area and it may not be until Tuesday that it lifts through a good part of the area. Yet again, there are considerable differences as to the movement of the front. This placement has large implications on temperatures and possibility of severe weather. It sounds like a broken record.

For Tuesday, we will assume that Philadelphia enters the warm sector, and makes a run at 87-90 degrees. With a shortwave riding along the warm front, showers and thunderstorms are likely. Again, if a portion of our area lies immediately south of the boundary, some of these storms could once again become spinners. It is too early to nail down the exact location and it may end up that it is entirely north of our area. We will also have to keep a watchful eye as to how close the cold front gets as the warm front is lifting through. That could also provide added lift. I would much rather have the cold front swinging through when the warm front is well to our north to avoid spinning thunderstorms. Anyhow, the cold front is expected to move through on Tuesday Night, likely preceded by a pre-frontal line of thunderstorm development. Some of the modeling keeps the front in New Jersey and Delaware through Wednesday Morning.

There could be some locally heavy rain on Tuesday, perhaps leading to another flash flood threat, especially in the northern counties. I expect some locations to get another one to two inches of precipitation. Precipitable water values become fairly decent by Tuesday Morning.

From Wednesday Afternoon through Friday, conditions look warm…but not humid. I don’t see any opportunities for much in the way of measurable precipitation.