SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/dry-wash-flash-flood

You're hiking a dry, sandy canyon bottom under clear blue skies. Can a flash flood still reach you?

Yes. A storm miles away can send a flood rushing down a dry canyon.

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  1. No, not unless it rains right where you are
  2. Yes, a storm miles away can send water your way ✔
  3. Only during spring snowmelt

Why: The National Weather Service says dry canyons and riverbeds can be dangerous even when it isn't raining. A thunderstorm several miles away can dump water that rushes downstream to you.

Huh, didn't know that: Desert ground is so hard that it can't soak up much rain, so storm water races into low spots like washes and canyons.

The dad joke
What has a bed that you can't sleep in? A river.
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References

Answer: Yes, a storm miles away can send water your way. The National Weather Service says dry canyons and riverbeds can be dangerous even when it isn't raining. A thunderstorm several miles away can dump water that rushes downstream to you.

  1. Flood Related Hazards (National Weather Service) www.weather.gov/safety/flood-hazards
    It can be dangerous for hikers to walk along these canyons or dried river beds even when it is not raining.
    Checked 2026-10-11.

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