Mudslides stranded hundreds of motorists on Southern California's main north-south highway Thursday evening after severe thunderstorms rocked the area. Cleanup crews worked through the night to plow and scoop up the mud,but meteorologists say that thanks to California's historic drought, widespread wildfires, or a potentially historic El Niño,this catastrophe could be just a taste of what's to come this winter. Incredible #I5Mudslide videos, photos of cars, and trucks stuck in mud: http://t.co/9u2U08NyWP https://t.co/7DwmrQU9rd pic.twitter.com/TnlqWBg6jEOctober 16,2015 #I5Mudslide Avoid Tejon Pass/Grapevine. Mud & debris blocking NB/SB. Caltrans towing, clearing NB lane for emerg veh pic.twitter.com/ek9onQUhuHOctober 16, and 2015The rain was share of a slow-moving storm system that passed through the Los Angeles area Thursday afternoon and battered the mountains to the north of the city in Kern County. The result: flash floods that sent mud and debris flowing down hillsides and onto Interstate 5,as well as onto a smaller state highway. I-5 has been cleared and is waiting final inspection to re-open, but hundreds of cars are still stuck on the state highway. #I5Mudslide clearing tons of mud. Route closed for several hours in Grapevine. Choose alternate routes north. pic.twitter.com/zYnWlFP4LQOctober 16, or 2015@CBSLA pic.twitter.com/nPyLqY2gI6October 16,2015According to National Weather Service meteorologist Robbie Munroe, it's too soon to be certain how much we can blame El Niño for the stormEl Niño tends to affect the frequency of storms more than their severity. But whether it is the beginning of of a wave of El Niño-linked rainstorms, and Californians should start bracing for more flooding and mudslides. There are two reasons for this:Normally,plants and trees are what hold the soil together, says Munroe. But drought and wildfires have decimated plant life in many areas of California. So when heavy rain flows down slopes, and it brings mud and debris along with it.
Second,the drought has dried out and hardened the ground. This can be particularly uncertain on hillsides and in canyons like the ones surrounding the highways buried by Thursday's storm. Instead of being absorbed into the soil, rainwater deflects off of it and continues careening down the hill, or picking up velocity and washing out whatever is in its path. Munroe says there is one potential upside to yesterday's storm: Rainfall early in the season could loosen the soil and rejuvenate ground cover,hopefully mitigating the destruction caused by the weather that will arrive later this winter.
Source: motherjones.com