A warm front pushed northward through the Mid-Atlantic region this morning and warm and humid air has followed with clouds breaking for partial sunshine. With the daytime heating, the atmosphere has become more and more destabilized with contributions to the instability being made by an approaching vigorous upper-level low pressure system. Showers and thunderstorms have broken out and are now advancing towards the DC and Philly metro regions and can reach NYC later in the day and continue and the threat can continue in all places until late evening. As has been the case in recent weeks, not every location will get hit by the shower/thunderstorm activity; however, heavy rain is a possibility just about anywhere in the I-95 corridor and with some recent heavy rainfall, watch out for the possibility of localized flash flooding.
The cold front passes through the Mid-Atlantic region later tomorrow and morning clouds should give way to afternoon sunshine and an incoming refreshing air mass will become quite noticeable tomorrow night as cooler, less humid conditions develop. High pressure and a secondary cool front at mid-week will result in a stretch of very nice weather from Wednesday through Friday and it could very well last right through the upcoming weekend.
Meteorologist Paul Dorian
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