Severe thunderstorms -- with hail and damaging winds -- are possible late Friday afternoon through midnight in Nassau County, the National Weather Service said in a hazardous weather outlook issued for the county.
Earlier in the day thunderstorms moved across Long Island, making for a hazardous morning commute for some.
The weather service said the hardest-hit areas were Nesconset, Woodmere and Wantagh early in the morning; Ronkonkoma, Lake Ronkonkoma and Lake Grove later on; and Holbrook and Holtsville as the storms moved east.
There's a 30 percent chance of more showers and thunderstorms in Suffolk as well into the evening and night Friday, the National Weather Service said, but those storms are not expected to be severe.
Saturday there's a slight chance of showers, with areas of fog before 10 a.m. Later in the day it is expected to be mostly sunny with highs in the upper 60s to low 70s, forecasters said.
Meanwhile, the Long Island Power Authority had reported more than 3,500 outages across the Island as of 7 a.m., the majority of those in Brentwood.
By 9 a.m., LIPA said more than 3,000 of those customers had their power restored, leaving just 358 without power. By 4 p.m. that number was under 30.
There had been 2,719 customers without electricity in Brentwood and 511 without power in Garden City, LIPA said.
It was not immediately clear how many of those outages were attributable to weather.
Police were reporting a handful of weather-related accidents Friday morning, including one that caused delays on the Long Island Expressway and another on the Southern State Parkway.
The Long Island Rail Road reported that a switch problem west of the Hicksville station caused delays Friday on the Port Jefferson branch. It was not clear if that problem was caused by weather.
Officials said a customer needing medical assistance caused earlier delays on the Montauk branch, affecting trains from Speonk to Long Island City and Penn Station.