Southern California is often subject to thick moist flows off the Pacific Ocean. The contrast of chilly ocean waters and relatively warm and dry land, especially in the autumn months often brings a marine layer of low laying and thick fog. Often times this can blow in off the ocean quickly. Sometimes the mist and fog are able to burn off fairly quickly if the temperature inversion – or what is defined as a warmer layer of air trapped above cooler moist air at the surface is able to break . Sometimes that doesn’t happen and it remains murky and damp with very low visibility. On November 3, 2002 dense marine fog rolled into the Los Angeles area just before sunrise and the result was an awful morning compute. 194 vehicles were involved in 2 pileups on I-710, with that dense fog to blame. Remarkably, no deaths occurred, bit it took the better part of the day to clean up the pile up.

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