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Story summary
- A cold front will bring cooler air to the United States over Labor Day weekend, ending heat.
- Severe thunderstorms will sweep the Ohio Valley, south-central Appalachians, and mid-Atlantic Sunday, then shift southeast Monday.
- The National Weather Service warns flash-flood risk between southern Nevada and central Utah, especially in urban areas.
- A surface low will deepen Monday over the northern high plains, bringing moderate to heavy rain to the northern Rockies.
