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Flash-flood watch for Suffolk expires but showers linger on Long Island

A last round of scattered showers and thunderstorms are likely for Long Island on Wednesday, as a cold front pushes east and out of the region, the National Weather Service said.

Ashley Sears, a meteorologist at the service's Upton office, said Wednesday's forecast is much like the past two days in which heavy thunderstorms and wind randomly struck parts of Nassau and Suffolk counties -- but "not as severe."

"The cold front is slowly pushing east now," Sears said Wednesday morning, "so we're looking at storms and thunderstorms again for Long Island.

"But that front should be out of the area by this evening."

The cold front combines with existing warm, humid ground conditions to produce the intermittent bursts of rain Long Island has experienced over the past 36 to 48 hours, the service said.

With the chance of rain Wednesday at 60 to 70 percent for most of Suffolk, the service issued a flash-flood watch until 2 p.m. for most of the county. In Nassau, a flash-flood watch expired Wednesday morning, as the heaviest of the rainfall moved east, the service said.

Sears said Nassau was hardest hit by rain during the past 48 hours, with 1 to 2 inches falling in several areas and as much to 3 inches in isolated spots.

Suffolk County had slightly less rain, with 1 to 1.5 inches in most areas.

The service recorded 1.3 inches of rain at Islip over the last 48 hours, she said.

The storm system also generated high winds, with gusts of up to 60 mph recorded along the South Shore in Nassau, she said.

The wind wasn't as strong overall in Suffolk, but there were reports of downed trees and utility lines, which would indicate some wind speeds in the 50 mph range, she said.

The good news is that high pressure approaches from the south as the cold front moves off Long Island, the service said. That means a stretch of mostly sunny days with temperatures in the low 80s, starting Thursday and running through Sunday.

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