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Arcus Cloud Glides Over Southern Maine Amid Severe Thunderstorm Warning

An arcus cloud glided over Portland, Maine, amid a severe thunderstorm warning on September 15. Dini Lamot was crossing Casco Bay on a ferry when he shot this footage of the shelf cloud. Lightning can be seen flashing in the distance. The National Weather Service (NWS) issued a severe thunderstorm warning on Wednesday and shared a photo of a shelf cloud taken from nearby Casco on the same day. Credit: Dini Lamot via Storyful
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