Tornado in Lewis County, New York

The National Weather Service in Buffalo used Sentinel-2 satellite

imagery and found tornadic damage in Lewis County. A damage scar

was found using difference techniques of satellite imagery. The

scar was found in a wooded area east of North Osceola Road in the

Town of Osceola. A damage survey could not be conducted due to

limited access into the wooded area. The tornado is thus rated

EF-Unknown.

A weak surface low tracked across western NY to the northeast of Lake Ontario from the afternoon to the late evening hours. Building instability and increased wind shear ahead of the low supported clusters of severe thunderstorms beginning late in the afternoon across the northern Finger Lakes. Additional northward moving severe storms that exhibited low-level rotation formed early in the evening in a narrow corridor from central New York to areas east of Lake Ontario. In addition to wind damage and large hail, two tornadoes occurred over northeast portions of Oswego County and southern portions of Lewis County during the evening. Eventually, storm surveys confirmed that one of these tornadoes near West Leyden New York to Turin New York tracked 16 miles with observed damage indicating peak winds up to of 140 mph or EF-3 strength. After the tornadic storms diminished, additional storms with very heavy rain tracked over portions of Oswego and Lewis counties from late evening into the overnight hours. These storms which trained over similar areas produced 3 to 4 inches of rain with multiple roads flooded and a few roads entirely washed out.