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WPC · Day 1 Excessive Rainfall Outlook

Scattered Flash Flooding Possible in the Southwest Friday into Early Saturday

Region

Arizona

Friday, October 30th, into early Saturday, a Slight risk means scattered flash flooding is possible across south and central Arizona, focused around the Mogollon Rim, where 2 to 3 inches of rain is expected. This higher-end portion of the Slight risk area makes urban spots, burn scars, and slot canyons the places most likely to see impacts. The heaviest rain peaks in the late afternoon before the overall threat begins to ease.

Region

Utah Nevada

Friday, October 30th, into early Saturday, the Slight risk extends into more of southern Utah and parts of Nevada outside the Las Vegas metro, where rainfall can exceed 2 inches and support scattered flash flooding. These areas share the potential for problems in urban zones and on sensitive terrain such as burn scars and slot canyons. Never drive through flooded roads in these spots.

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Region

Overnight Southwest

Friday, October 30th, into early Saturday, the Southwest stays the main focus for heavy rain into the overnight hours, with an additional 1 inch or more possible before the storms weaken. The potential for flooding gradually wanes through the late-night hours as the energy for storms fades. City streets, small creeks, and already wet ground remain the places to watch until then.

Region

Texas

Friday, October 30th, into early Saturday, a shield of moderate rainfall continues across much of Texas this morning and early afternoon with hourly rates generally half an inch or less, keeping the flash flood threat isolated. Extra rain on already soaked soils maintains the concern, especially at low water crossings across the Hill Country where warnings were issued earlier. Flooding, if it happens, should stay limited to those vulnerable spots.

Region

Central Plains

Friday, October 30th, into early Saturday, moisture streaming northward through the central Plains may bring 1 to 2 inches of rain through the day, but high ground absorption should keep any flooding isolated if it occurs. The exception is northern Kansas, where overnight rain has made the ground more susceptible to runoff in some locations. Low water crossings, city streets, and small creeks are the places most at risk.

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