Summary:
NYC is expecting heavy thunderstorms and flash floods from Tuesday into Wednesday morning.
A cold front meeting moist air is the main cause of the storms, but Tropical Storm Debby could amplify the rainfall.
A "predecessor rainfall event" tied to Debby could increase rainfall rates to up to two inches per hour.
Heavy rain bands could repeat over the region, fueling anticipated flash flooding in NYC and surrounding areas.
NYC Facing Heavy Rains: Tropical Storm Debby May Amplify Downpours
The New York City area is bracing for heavy thunderstorms and flash floods from Tuesday into Wednesday morning. Experts say this weather event is due to a cold front meeting extremely moist air over the metropolitan region.
While these storms would have happened regardless of Tropical Storm Debby, a meteorological phenomenon tied to Debby, known as a predecessor rainfall event, could significantly increase the amount of rain falling in the city. This could lead to rainfall rates up to two inches per hour, according to the National Weather Service.
What is a predecessor rainfall event?
These events are often underestimated and occur north of a tropical storm's central circulation. They are separate from the storm's main precipitation area, which in the case of Debby, remains over the Southeast.
The vast amount of tropical moisture associated with Debby could be directed towards the Northeast storms, potentially intensifying rainfall there. There's also a chance for heavy rain bands to repeat over the region, further fueling anticipated flash flooding in the city and suburbs.
What to Expect:
- Heavy rain, potentially up to two inches per hour
- Flash flooding in NYC and surrounding areas
- Possible travel disruptions
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