Damage was reported in Lake Ronkonkoma, Centereach, Selden, and Smithtown.
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The line of storms knocked out power to hundreds of homes and businesses in the county.
A number of local street closures were reported Friday morning due to downed trees and power lines, including Portion Road between School House Road and Newtown Boulevard in Lake Ronkonkoma.
Despite an early report of a possible tornado touching down in Ronkonkoma, the National Weather Service says Thursday night's damage was caused by straight line winds.
No tornadic activity was detected.
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It came one day after another powerful storm prompted Ulster County to declare state of emergency amid downed trees and power lines.
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