The Northeast United States saw some of the worst flooding in over a decade after storms ravaged the area.

The storms stretched across an area from North Carolina to Vermont, leading to flash flooding, flight delays, and severe damage. The National Weather Service warned of potentially "catastrophic" flooding in some areas.

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"This is a very serious situation," the agency's office in Burlington, Vermont, tweeted. "Everyone in Montpelier and surrounding areas need to stay up-to-date on the river levels. Significant to catastrophic flooding is expected!"

Vermont Gov. Phil Scott (R-VT) warned residents to stay away from waterways and remain vigilant throughout Monday night.

"Flooding in parts of Vermont have surpassed what was experienced during Tropical Storm Irene, and rivers are expected to continue rising through the night. Stay away from waterways. If you need assistance, call 2-1-1. Follow @vemvt for continued updates," the governor tweeted.

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Over 6 million people across the northeastern U.S. were under flood watches or warnings Monday night, with the largest affected area spread across New York, New Hampshire, Vermont, and Maine. Vermont was the worst affected.

The unusually strong storms were blamed on "the low pressure system and anomalous atmospheric moisture content associated with the ongoing heavy rain," according to an NWS forecast discussion. The storms are expected to cease in the region on Tuesday.