Disasters · Colorado River ValleySan Bernardino flood watch: Colorado River Valley faces overnight flash-flood riskWritten October 31, 2026 at 11:49 PM UTCWatchTranscript0:07Twelve inches of rushing water can sweep away most vehicles.0:10A flood watch covers the Upper Colorado River Valley portion of San Bernardino0:14County, where excessive rainfall could flood low water crossings.0:17The precise end time for the California watch is still unclear.0:20The California Alert specifically names San Bernardino County's Upper Colorado River0:25Valley.0:25The affected area list also includes Lake Havasu and Fort Mojave, and the Arizona0:30and Nevada sides of Lake Mead and Lake Mojave.0:32People elsewhere in San Bernardino County shouldn't assume their community has the0:35same alert.0:36The listed California area is the river valley along the county's eastern edge.0:40Check the alert for your own location before making travel or overnight plans.0:43Runoff can collect in river channels and low-lying ground, including places where0:48rain isn't falling directly overhead.0:49Flash floods can develop within minutes to hours, so conditions at a crossing can0:54change quickly.0:55The National Weather Service's Las Vegas office says excessive runoff may flood0:58rivers, creeks, and streams.1:00Water may also collect in urban areas and places with poor drainage.1:03Low water crossings are among the locations that could become submerged.1:07A flood watch means conditions favor flooding, so people should prepare.1:10Flooding hasn't been confirmed for this watch period.1:13A flash flood warning means flooding is imminent or happening, and people in1:17threatened locations need to act immediately.1:19The initially stated start is eleven p um Saturday, October thirty-first, with the1:24risk continuing overnight and into Monday.1:26The uncertainty is how far into Monday the California watch runs.1:30Treat an early end time cautiously until you've checked the latest alert.1:33The initially stated end time is one A.1:35M.1:36Monday, November second.1:38Four A.1:39M.1:39also appears for the California area.1:41It isn't clear whether that reflects an extension or a mix up between alert areas.1:45The active California expiration still needs confirmation.1:48California's clocks also change during the overnight watch period.1:51That affects how local times line up, but it doesn't settle which expiration1:54applies.1:55Keep watching later forecasts and be ready to act if a flash flood warning is1:59issued.1:59At two a m Sunday, November1.2:03Pacific clocks move back to one a.2:05m.2:05The repeated hour happens Sunday.2:07Monday's1 a M occurs only once after the rollback.2:11The clock change doesn't explain away the competing expiration times.2:14If water covers a road, turn around.2:17Don't walk into it to test the depth, and don't drive through it.2:20Obey road barricades.2:21The force of moving water can become dangerous at depths that look deceptively2:25shallow.2:25Six inches of fast moving water can knock a person off their feet.2:28As little as twelve inches of rushing water can sweep away most vehicles.2:32Those figures describe the danger.2:34They don't provide a safe depth for entering floodwater.2:37Stay away from swollen drainage channels and culverts and avoid parking beside them.2:41If a flash flood warning or rising water threatens a low, lying location, move to2:45higher ground.2:46Follow any evacuation instructions from local authorities.2:49Water around submerged electrical outlets or cords can also be dangerous.2:52Stay out of those flooded spaces.2:54If moving water traps you, reach the highest accessible point and call nine one one.Read the articleStory timelineHeyDex
