Marine Thunderstorm Wind — Niagara River To Hamlin Beach Ny, Lake Ontario

2019-07-20 · near Olcott, Niagara River To Hamlin Beach Ny, Lake Ontario

Wider weather episode

After several days of oppressive heat and humidity, the atmosphere was ripe for thunderstorms. A mesoscale convective system (MCS) blossomed over Michigan during the afternoon hours and tracked eastward. It began to weaken while transitting Canada, but it still packed a punch as it reached far western New York. Even during the late evening, dewpoints in the lower 70s aided in producing a very unstable environment. Higher dewpoints were concentrated near Lake Erie and the Pennsylvania state line with another bubble near the western end of Lake Ontario. As this MCS drew closer to our region, it drew upon this instability and produced several thunderstorm line segments. These structures were greatest over Lake Erie and its shoreline, as well as Lake Ontario and in Niagara and Orleans counties. Well defined outflow boundaries were exhibited with these storms. As activity pushed inland, it weakened quickly.

View location on OpenStreetMap → (43.3400, -78.7100)

Source: NOAA Storm Events Database, event_id 846637. Narrative written by the NWS forecast office that issued the report.