How a rotating storm produced likely tornadoes near Charles Town and Frederick

Although Monday featured strong shear, the instability was marginal. Accordingly, the Weather Service’s Storm Prediction Center declared just a 1 out of 5, or “marginal,” storm threat, and the primary damage mode was anticipated to be straight-line wind. Sometimes, however, tornadic thunderstorms can erupt in marginal setups, particularly when warm fronts are involved.

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