Torrential rain could spark some flooding on the roads for the Fourth of July, as showers and thunderstorms continue to impact the region during the holiday weekend.

The National Weather Service has issued a flood watch for a wide swath of the Bay State through late Tuesday night.

Meteorologists are warning that flash flooding caused by excessive rainfall continues to be a threat.

“Locally heavy downpours at times, which may result in flooding especially along & south of the MA Turnpike,” the National Weather Service’s Boston office tweeted on Monday.

“Shower/storm activity will be more widespread across southern New England on July 4th,” NWS Boston added.

The counties that were under the flood watch Monday afternoon were: central and northern Middlesex; western Essex; southern and northern Worcester; eastern Hampden; eastern Hampshire; and eastern Franklin.

“Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations,” the National Weather Service wrote in its alert. “Flooding may occur in poor drainage and urban areas.”

Two to up to four inches of rain fell on Sunday. Multiple rounds of showers and thunderstorms are anticipated through the Fourth of July, which may produce additional rain amounts between one to three inches.

“Slow moving and re-developing downpours may elevate the risk for urban and street flooding along with localized areas of rapid-onset flash flooding,” the NWS wrote. “Excessive runoff will also result in rises on streams, creeks and tributaries to potentially over bankfull.”