A warm front is expected to arrive late tonight and it will slowly move northward through our region on Monday. Numerous showers and thunderstorms are expected. Locally heavy rainfall is likely with any thunderstorm. With the extensive cloudiness, any severe weather would be limited.
On Tuesday, as the warm front continues to move northward, a cold front will move into the region. This front may not clear totally out of the region until sometime on Wednesday. Scattered showers and thunderstorms will be likely during this time frame. Yet again, locally heavy rainfall is possible in any thunderstorm.
Flash flood guidance as of this evening is running quite low in a good part of our region. It will only take 1 to 2 inches of rain in 6 hours or less to create flash flooding from Southeastern Pennsylvania into North-Central New Jersey. Across much of Delaware, 2 to 3 inches of rain is needed in less than 6 hours to create flash flooding. So flash flooding could occur during the next 72 hours.