Low pressure is taking shape near the Carolinas today and will race northward up the mid-Atlantic seaboard tonight and pass well to our west on Sunday, bringing gusty winds and heavy rain to parts of the Mid-Atlantic and Northeast. The development of this weather system is part of a larger-scale shift in the weather pattern that will yield an extended period of very humid weather here on the Cape and some off-and-on episodes of unsettled weather.
We can anticipate partial sunshine through the day, freshening onshore breezes and temperatures in the 70s. Some patchy areas of low clouds (and maybe some coastal fog) will drift onshore from time to time here and there. Humidity levels will slowly tick upward as low level moisture begins to build back into the area.
Tonight clouds will thicken across the area in response to approaching low pressure and some isolated showers and some pockets of mist will begin to rotate northward into the area.
Moisture will continue to overspread the area on Sunday, resulting in a mostly cloudy sky through the day and the possibility for some passing showers / downpours / thunder at just about any point during the day. While it won’t be raining all day long and there will certainly be plenty of dry hours, it’s tough to rule out wet weather during any particular time of the day. Along with the threat for showers will come a gusty south wind and a noticeable increase in humidity as dew point values will climb into the 70s.