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Marine Thunderstorm Wind · Atlantic North

Marine Thunderstorm Wind July 23, 2019 · Coastal Waters From Provincetown Ma To Chatham Ma To Nantucket Ma Out 20 Nm Values, Atlantic North

62 mph

Measured sustained (54 kt)

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

High sustained winds of 62 mph were measured by a mesonet site at Chatham.

The wider storm

A deep southerly flow of tropical moisture was in place over southeast MA with precipitable water values in excess of 2 inches on the south coast. A frontal wave along the coast provided strong low level convergence and that combined with upper divergence from the right entrance region of a 110 knot upper level jet to produce very severe weather for Cape Cod. Three tornadoes occurred! Prior to these, there had only been three recorded tornadoes since 1950. Outside of the tornado area, damage surveys showed that strong microburst winds caused straight-line damage.

Began near Chatham Light (41.6700, -69.9500).

Source: NOAA Storm Events Database, event 846489. Narratives are written by the National Weather Service forecast office that issued the report.

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