‘Microbursts’ pounded South Jersey on July 4th, and Philly heat may have been a factor

Those destructive winds and rains that cascaded violently from the skies like powerful waterfalls over a portion of Camden and Burlington Counties on Tuesday wereAnd radar images suggested the potency of the responsible thunderstorm may have been related to the urban heat cooked by the sun and the paved surfaces of the city, said Ray Martin, a meteorologist with the Mount Holly National Weather Service.

The process was repeated multiple times Tuesday as the parent thunderstorm more or less stalled in place for up to 90 minutes in the languid steering winds. Philadelphia and other highly built areas along the I-95 corridor form a formidable heat-island chain with their sun-absorbing phalanxes of skyscrapers, shopping malls, streets, parking lots, and assorted paved surfaces.Their impacts on temperature are well-known, particularly on nighttime temperatures. Those building and paving materials are reluctant to give up their heat after sunset, and overnight lows in the city can be several degrees higher than in surrounding areas.

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