00:00Tropical moisture could raise flash flood risks across the American Southwest this Halloween weekend.
00:06Forecasters expect Pacific storms to draw moisture from near Hawaii toward the western United States.
00:12That moisture could form an atmospheric river, bringing heavy rain and mountain snow.
00:17The concern is intense rainfall over ground that is already saturated.
00:21Parts of the San Juan Mountains recently received 5 to 10 inches of rain,
00:25contributing to flooding and record stream flows at some gauges.
00:28Arizona, Utah, New Mexico, and Colorado could face renewed downpours, rising rivers, and dangerous debris flows.
00:37Southern California's outlook is less certain.
00:39If storms move quickly, most major metro areas could receive less than an inch of rain.
00:44But if the systems combine and slow down, more persistent rainfall could increase flash flood risks.
00:50The key factor is how the storms develop.
00:52Check local forecasts for the latest conditions and official warnings.
00:56Disclosure. This video contains stock footage and content created or enhanced using AI-assisted tools.
