New York City and parts of New Jersey woke up to flash flood warnings Monday as multiple rounds of heavy rain and thunderstorms moved through the region, disrupting the morning commute and prompting city emergency officials to activate their flash flood response plan for the second time in recent weeks.

The National Weather Service issued a flood watch for New York City and northern New Jersey through Monday night, with a flash flood warning specifically in effect for the city until 8 a.m., according to CBS News New York. Separate flash flood warnings covered Dutchess, Essex, Passaic and Bergen counties until 8 a.m. as well, according to Fox 5 New York. New York City was placed under a Level 2 out of 4 flash flood threat by FOX Weather's scale, while the broader tri-state area faced a Level 1 severe weather threat.

The storm system first moved into the tri-state area late Sunday evening, with thunder rolling through the region in the pre-dawn hours before additional rounds of heavy rain arrived throughout Monday morning and into the afternoon, according to NBC New York. A National Weather Service flood watch bulletin issued at 5:59 a.m. warned that rounds of heavy showers with embedded thunderstorms were expected through the afternoon, with localized rainfall rates of 1 to 2 inches per hour possible. Officials cautioned that any "training" of thunderstorms, a phenomenon in which multiple storm........

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