Flooding caused delays on multiple New York City subway lines Monday as torrential rain pummeled the Tri-State Area.

Several NYC subway stations flooded on Monday night after rain drenched parts of the city, causing severe delays and even closures.

There’s been an abnormal amount of extreme rainfall across the United States in recent days. Here’s what’s driving it.

The subway system, which is more than a century old, is relied on by millions of passengers every day and weaves the city into a cohesive network.

Heavy rainfall flooded portions of New York and New Jersey, with videos on social media showing a subway station inundated with floodwaters.

Travelers were bracing Tuesday morning for bumpy commutes across the New York City area due to residual disruptions from Monday’s torrential downpours, though the National Weather Service said the storms had moved east by then.