Thunderstorms are causing flash flooding around the Boston area this Sunday morning, and the concern will remain high for new incidents as this holiday weekend progresses.
Boston's southern suburbs are bearing the brunt of the heavy thunderstorms, while the city's far northwestern suburbs such as Lexington remained dry to start the day.
Flash flooding has already forced officials to temporarily close both lanes of Route 128/Interstate 95 at Exit 19, near Needham, according to the Massachusetts Department of Transportation.
Three cars became stuck in flood waters in the suburb of Wellesley.
Low-lying and poor drainage areas, as well as places near streams and creeks, are most susceptible to flash flooding.
Even where flooding does not ensue, motorists will encounter reduced visibility and a heightened risk of vehicles hydroplaning at highway speeds. This includes those planning to travel on Interstates 93 and 95.
Those who want to brave the rain should still seek shelter due to the accompany lightning. Isolated incidents of strong winds and small hail cannot be ruled out.
An end to the flash flood threat in the Boston area will not come with the departure of Sunday morning's thunderstorms.
Drenching showers and thunderstorms will continue to occasionally move through the area as the remainder of this Labor Day weekend progresses.
In addition to low-lying and poor drainage areas, places where the ground was saturated from thunderstorms earlier this holiday weekend are at greatest risk of enduring flash flooding.
Periods of rain and thunderstorms will follow for Tuesday before drier and less humid air arrives on Wednesday.
Temperatures will be a few degrees below average across the UK this weekend, but largely dry conditions are expected.
After no rain for almost a month, Santiago braces for rain early in the week. Cool air follows, spreading into Chile, Argentina and Uruguay mid-week.
There is a significant chance that Jimena will turn back toward Hawaii and threaten the islands during the second week of September.
An unusually strong push of cool air for early September will move southward along the Atlantic Seaboard into the Labor Day weekend before July-like heat returns by next week.
Steering winds could take Ignacio, as a remnant storm, into the southeastern arm of Alaska or British Columbia during the middle days of next week.
Strong thunderstorms will roll across the Upper Midwest while rain and strong winds roar through the Northwest this weekend.
Los Angeles, CA (1988)
110 degrees -- all-time September record.
Washington, DC (1939)
"Once in a hundred-year rainstorm" 4.40 inches in 2 hours at the Washington Zoo.
Minneapolis, MN (1941)
Tornado - 5 dead - $450,000 damage.