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Severe · Flood WatchActive alert

Flood Watch issued October 21 at 12:22PM MDT until October 23 at

Affecting Central Mountains; Castle Country; San Rafael Swell; Lower Washington County; Zion National Park; Southern Mountains; Upper Sevier River Valleys; Bryce Canyon Country; South Central Utah; Capitol Reef National Park and Vicinity; Western Canyonlands; Glen Canyon Recreation Area/Lake Powell

In effect until: Oct 22, 2026, 9:30 AM

Central Mountains; Castle Country; San Rafael Swell; Lower Washington County; Zion National Park; Southern Mountains; Upper Sevier River Valleys; Bryce Canyon Country; South Central Utah; Capitol Reef National Park and Vicinity; Western Canyonlands; Glen Canyon Recreation Area/Lake Powell

Possible impact zone; conditions develop through 9:30 AM.

You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. People in the backcountry should ensure they have alternative routes available in case their primary route becomes impassable.

Read the original bulletin (official text)
* WHAT...Flash flooding caused by excessive rainfall continues to be
possible.

* WHERE...A portion of Utah, including the following areas, Castle
Country, Central Mountains, San Rafael Swell, Bryce Canyon Country,
Capitol Reef National Park and Vicinity, Glen Canyon Recreation
Area/Lake Powell, South Central Utah, Southern Mountains, Upper
Sevier River Valleys, Western Canyonlands, Lower Washington County
and Zion National Park.

* WHEN...Through Thursday evening.

* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, dry washes, slot canyons, and other low-lying and
flood-prone locations such as slickrock areas and recent burn
scars.

* ADDITIONAL DETAILS...
- A late season surge of tropical moisture will bring widespread
moderate to at times heavy rainfall across much of southern Utah
through Thursday. Local rainfall totals in excess of 3 inches are
expected through Thursday evening.
- All normally dry washes, small streams and mainstem rivers will
see elevated flows from this excessive rainfall, with periods of
heavier rainfall resulting in flash flooding. Backcountry roads
may become impassable due to flooding.
- http://www.weather.gov/safety/flood
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™