Severe storms hammered parts of the tri-state area Monday afternoon into the late evening hours, flooding City subways, prompting dozens of water rescues and triggering a state of emergency in hard-hit parts of New Jersey.

The National Weather Service has issued flash flood watches for parts of 17 New Jersey counties on Monday to start a stormy week.

NYC could be in play for another heat wave this week, with the potential for more heavy rain, storms and flash flooding due to the hot and humid conditions.

Footage shows wooden slats from the home on the ground with other debris. The blast took place around the same time heavy rainfall hit the northeast.

Forecasters say some thunderstorm cells have the potential to dump as much as 2 to 3 inches of rain in one hour, posing a risk of rapid flooding.

The weather service said there's a "marginal" risk of flooding in portions of Nassau and western Suffolk, but nothing what's expected to the west and north of LI.