NEW YORK — An estimated 11,400 utility customers are without power in New York’s Westchester County as Mother Nature delivers a second winter punch to the region.

The numbers improved Wednesday as utility crews worked feverishly in the wake of last weekend’s nor’easter. Now a winter storm warning is in effect until early Thursday.

Westchester County Executive George Latimer, a Democrat, says that snow and high winds could “undo the temporary fix.”

The National Weather Service says up to 11 inches of snow could fall in New York City and southern Westchester County.

It says up to 18 inches could fall in northern Westchester, Rockland and Putnam counties.

The weather service expects up to 20 inches of snow in the Schoharie (skoh-HAYR’-ee) Valley and eastern Catskills.