Thunderstorm Wind in Nantucket County, Massachusetts

In Nantucket at 741 PM EDT, the ASOS at the Nantucket Airport (KACK) recorded a wind gust to 60 mph.

A squall line formed in New York State then raced eastward in the late afternoon and early evening, gathering strength as it raced across Massachusetts, northeast Connecticut, and northern Rhode Island. Hundreds of thousands of people were left without power in southern New England, as there was widespread tree and power line damage from winds generally gusting to between 50 and 80 mph. The Storm Prediction Center officially classified it as a derecho. Along the line, an isolated brief tornado touched down in Millis, Massachusetts. Prior to the derecho, strong southwest winds gusted to 40-50 mph in the early afternoon.