Heavy rain and strong thunderstorms are likely across the northeast this weekend, with a significant threat of flooding rains arriving tomorrow especially for a zone that stretches from central New Jersey and eastern Pennsylvania north and east across New England into southwestern Maine. According to the National Weather Service’s Weather Prediction Center, over 31 million people are under a Moderate Risk of Excessive Rainfall tomorrow as another round of heavy rain is expected to produce significant flash flood concerns along the I-95 corridor.

Anomalously moist air pushing north ahead of a frontal boundary will lead to another round of heavy rain across the northeast tomorrow. An additional 2-4″ of rain, with some localized 5″+ possible, falling on top of very wet soils and swollen streams and rivers will lead to further flooding concerns.  Numerous flash floods are likely, especially in portions of New Jersey, Pennsylvania, New York, Connecticut, Massachussetts, New Hampshire, Vermont, and Maine.

The National Weather Service wants people in this area to remember 3 things to be prepared for the storm: stay weather aware, have multiple ways to receive flood warning notifications, and remember to never drive or walk into a flooded road.

In addition to heavy rain, there is the possibility of wind damage, large hail, and isolated tornadoes in the northeast tomorrow too. According to the National Weather Service’s Storm Prediction Center, storms are likely to be ongoing from Virginia north into New York and southern New England, with bands of convection possible oriented south-southwest to north-northeast.  Given the long duration of storms throughout the period, chances for locally strong gusts or even a brief or weak
tornadoes have been extended eastward into southern New England where high dewpoints along with atmospheric instability may  support transient areas of rotation within the more prolonged bands or zones of convection.