* WHAT...Flooding caused by excessive rainfall is possible. * WHERE...A portion of Utah, including the following areas, Castle Country, San Rafael Swell, Bryce Canyon Country, Capitol Reef National Park and Vicinity, Glen Canyon Recreation Area/Lake Powell, South Central Utah, Southern Mountains, Western Canyonlands, Lower Washington County and Zion National Park. * WHEN...From late Saturday night through Sunday 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... - Widespread moderate to at times heavy precipitation is expected across much of southern, southeast and east central Utah beginning late Saturday night, and continuing throughout the day Sunday. Moist antecedent conditions from recent heavy rains will result in efficient and excessive runoff, allowing all area washes, streams and rivers to run fast and high. Flood prone areas will likely become inundated at times, and backcountry roads will likely become impassable from this excessive runoff. - http://www.weather.gov/safety/flood