A weak storm system will slowly bend southward Monday and Tuesday, carrying storms along the Northeast coast and bringing another threat for significant flooding.
Flash flood watches have been issued by the National Weather Service from northern New Jersey up through the southern edge of Maine, including for New York and Boston.
Some watches are in place through Tuesday and Wednesday as the rain is expected to be slow-moving.
The prediction center has issued a moderate risk for heavy rainfall Monday over the tri-state area of New York, New Jersey and Connecticut due to two rounds of rainfall bringing extensive flooding threats.
Heavy rain will fall on soils that are already saturated from previous rainfall in the last week, leading to more runoff and higher flood risk.
Monday evening holds the greatest flooding concern in the tri-state area, due to thunderstorms moving across the region dumping from 2 to 5 inches of rain.
The month-to-date rain total in New York is already 4.8 inches for the month, compared to the 1.5-inch average for the month-to-date July rainfall. That is a record for the highest amount of rainfall recorded so far in July.
Boston is included in a slight risk for excessive rainfall and could see almost 2 inches of rainfall in some areas.
It has already been a wet July for the city with rainfall this month making it the fifth-wettest July on record.
The month-to-date rainfall in Boston has reached a record 7.6 inches after seeing rain every day since the beginning of the month. The average month-to-date rainfall for the area is 1.2 inches.
By Wednesday the low-pressure system will push a warm front northward and leave drier weather behind for the Northeast. The dry period won’t last for long though — as the end of the week could bring even more rain to the drenched region.