How wildfire burn scars make threat of flooding in LA more severe
Los Angeles is bracing for potentially catastrophic rain as a strong atmospheric river is set to hit the region, adding to the challenges faced by recent extreme weather events. The National Weather Service has issued flood alerts for millions of people across California over the Christmas holiday, with Southern California expected to bear the brunt of the storm.
Starting Tuesday night and lasting into Thursday evening, heavy rain is forecasted to bring significant flooding to the region, especially in areas with recent burn scars. The first round of rain, expected to begin around 9 p.m. on Tuesday, will be the strongest, with Santa Barbara and Los Angeles areas likely to experience intense rainfall.
Rainfall rates could exceed 1 inch per hour, with total accumulations ranging from 3 to 7 inches over an 18-hour period. Some localized spots may see up to 9 inches. This amount of rain is significantly higher than the average December precipitation for the region.
The Weather Prediction Center has issued a rare “High Risk” alert for excessive rainfall and flash flooding across portions of Southern California, including Los Angeles, Burbank, Altadena, Glendale, San Bernardino, Santa Clarita, and Thousand Oaks. Evacuation warnings are in effect for vulnerable areas, particularly those with recent wildfire burn scars.
The risk of flash flooding and debris flows is heightened in areas with burned soil, as the ground becomes less absorbent and more prone to dangerous runoff. The National Weather Service warns of the potential for rock slides, mudslides, and severe flooding in urban areas and along freeways.
Recent years have seen California experience hydroclimate whiplash, with rapid shifts between wet and dry conditions contributing to severe wildfires. The upcoming storm presents a high risk of major mudslides, rockslides, and swiftwater rescues. Residents should prepare for travel delays, cancellations, and road closures.
In addition to the flooding threat, strong winds are expected in higher elevations and mountains, with wind gusts of 60-70 mph possible in some areas. Power outages and wind damage are potential risks, prompting wind advisories for coastal cities like Los Angeles, San Francisco, and San Diego.
As California braces for the incoming storm, residents are urged to stay informed, follow evacuation orders, and take necessary precautions to ensure their safety. The combination of heavy rain, flash flooding, and strong winds poses significant challenges, requiring vigilance and preparedness from the community.
