High pressure centered over West Virginia will drift over the Philadelphia and New York City metropolitan areas today leading to clear skies, low humidity, and an important shift in the winds.
Under the influence of generally clear skies, winds will shift from the northwest to the southwest today at around 5 mph. That shift in winds by this evening will start a gradual increase in humidity throughout the region. For today though, under the influence of low humidity, temperatures will rise into the mid to upper 80’s for highs.
Tonight, as the humidity increases, so will the potential for fog in the morning. Otherwise, scattered cloud cover can be expected with winds from the southwest at 5 mph. Temperatures will fall into the mid to upper 60’s for lows. By tomorrow afternoon and Saturday, while scattered cloud cover is expected, an increase in humidity will be felt. The increase in humidity will combine with temperatures in the mid 80’s to lower 90’s to make temperatures fell like the lower to mid 90’s. Lows will fall back into the mid 60’s to lower 70’s.
A series of disturbances will approach from the northwest Sunday on through Tuesday with the threat for scattered showers each day. The influence of remnant tropical moisture from Tropical Storm Isaac will support the potential for showers with very heavy downpours. Temperatures through the forecast period will range from the mid 60’s to lower 70’s for lows and lower to mid 80’s for highs.