Special Weather Statement issued July 31 at 1:48PM EDT by NWS

…Isolated Thunderstorms Over the Champlain Valley… Isolated showers and thunderstorms have developed along the western shore of Lake Champlain this afternoon, and will continue to slowly drift east-southeast across the lake and into the Vermont side of the Champlain Valley over the next couple of hours. Brief heavy rain and occasional lightning can be expected.

Source: National Weather Service Alerts for Vermont