Northerly winds will generate increased waves over Lake Ontario Friday and Friday night and could result in more shoreline flooding, the National Weather Service said.
The weather service posted another lakeshore flood watch from 7 a.m. Friday to 2 a.m. Saturday for shoreline communities in Niagara, Orleans, Monroe and Wayne counties.
Wave heights are expected to reach 4 to 5 feet along the lake's southern shoreline through early Saturday morning, forecasters predict.
"The risk is increasing that waves could build to levels that may produce additional erosion and flooding along much of the south shore of the lake," the weather service said.
Shoreline flooding has been a persistent problem because Lake Ontario has met or exceeded its historical high water levels due to near-record precipitation across the watershed to start the year.