Violent thunderstorms racked across the northern plains state on the evening of June 24 1991. Hot humid conditions had held sway across a vast part of the nation’s midsection during the middle of June, while chilly air built up over Alaska and the Yukon. On June 23 that cold air was unleased southward by a strong current in the Jetstream. As it pushed into the early summertime heat thunderstorms began to grown. By June 24, 1991, aided by moisture streaming northward from the Gulf of Mexico heavy thunderstorms erupted across the Dakotas as the cold air mass cut into the region. The warm steamy air holding near the grounds surface was enough to supply plenty of moisture – but the cold air moving in high in the atmosphere was enough to cause large hail to form and in the town of Scranton, North Dakota 3.5” of rain in 28 minutes along with 1.5-foot drifts of marble sized hail. Front-end loaders were needed to clear the streets.

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