2019-07-23 EVENT: MA

[JamesCaruso]

On 7/23/19 there were four tornado reports from at least two separate confirmed tornados in Yarmouth / Cape Cod Storm Prediction Center 20190723's Storm Reports

Just a sliver of the coast was included even in the *general* thunderstorm outlook

Storm Prediction Center Jul 23, 2019 1630 UTC Day 1 Convective Outlook

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Reflectivity had a distinctive supercell shape and the base velocity image looks pretty decent if not all that “tight” - especially for that region (obtained from RadarScope archive from around the time of the first report)





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Pretty amazing video of the roof of an inn being torn off

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I was not following the weather at all that day. Anyone have any insights into how/why this supercell and tornado was able to form?

 

[Quincy Vagell]

It was along a frontal boundary and I recall mesoanalysis showing substantial surface vorticity in the area. The “cell” appeared to be a small MCV/mesolow with backed flow on its nose. Instability was very low (<500 J/kg), but there was favorable low-level shear.