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St. Louis, MO

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Flash Flood Threat Increasing
6/21/2026 Tornado Summary
A band of very heavy rain is expected Thursday night and Friday morning, which will lead to at least isolated flash flooding. The highest threat appears to be centered on I-70, but this may shift in subsequent forecast updates.
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A total of 4 tornadoes were surveyed from thunderstorms on 6/21/2026. Three were rated EF0 and one was EF1. Most damage was confined to trees, though some tree limbs did fall onto structures causing roof damage.
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