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Waterspout · Atlantic North

Waterspout August 10, 2012 · Block Island Sound, Atlantic North

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

What the National Weather Service wrote

The Block Island Times reported a tornadic waterspout moved onshore Block Island, RI at 3:54pm. Backtracking the rotation over the water we determined the location the waterspout would have likely formed. The tornado onshore was rated an EF0.

The wider storm

A series of upper level disturbances rotated around a vertically stacked low pressure system in the Great Lakes. These provided a focus for showers and thunderstorms to develop across southern New England. Southerly winds drew tropical moisture over the area, resulting in very heavy rain in showers and thunderstorms that developed. In addition, strong winds in the upper levels and 30-40 knots of deep layer shear resulted in wind damage with the strongest of these storms.

Began near Block Island Airport (40.9927, -71.6031).

Source: NOAA Storm Events Database, event 408655. Narratives are written by the National Weather Service forecast office that issued the report.

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