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“The storm’s track still varies wildly, depending on which model you are looking at or which meteorologist you’re following,” Mr. Ribeiro said Friday. “We’re not quite sure whether it’s going to be a glancing blow or a full-on hit.”

Mr. McDuffie said he has received assurances from Pepco, the power utility that serves the District and thousands of customers in Maryland, that it will have additional crews on hand to handle any power outages in Bloomingdale. Pepco was widely criticized in late June, when a derecho storm knocked out power among its customers for up to week during the heart of a heat wave.

In a press briefing, Pepco said they have monitored the impending storm since the start of the week and are treating it as an “all-hands event.”