15-year-old boy killed, 4 injured in lightning strike on Colorado summit; plus, a severe storm threat expands into the Southeast before shifting west through this week

The AccuWeather Lightning Network™ detected 29 lightning strikes within 5 miles of the Mount Blue Sky summit during a 13-minute window.

Also, a multi-day severe weather threat will bring damaging winds and flash flooding to parts of the East Coast before expanding into the Southeast and Plains later this week.

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