New York is bracing for a full-day washout as relentless rain returns, raising the threat of flash floods across the region.

After brief sunshine midweek, downpours resumed Thursday night and are expected to continue, with a 90% chance of rain blanketing the Tri-State area.

Forecasters warn of a low to moderate flood risk, especially in vulnerable neighbourhoods such as Penfield, NY.

The wet pattern caps off a gloomy week marked by steady showers, cool temperatures, and grey skies.