Los Angeles-area flood messaging intensified Wednesday as forecasters tracked short-burst, high-intensity rainfall capable of overwhelming drainage systems and sending runoff rapidly into low-lying streets, underpasses, and canyon corridors.
Local alerts and advisories have been refreshed repeatedly through the morning as radar trends and rain-gauge data sharpened the near-term threat picture across the metro’s foothill-adjacent neighborhoods and popular pass routes.
At the center of the concern is an atmospheric-river-driven storm tapping deep Pacific moisture and producing rainfall rates that emergency managers treat as a tipping point for fast-onset flooding. In official warning language republished from the National Weather Service (NWS), rainfall rates in the region have been expected to reach
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