Natural Hazards
During October and November 2003, a number of wildfires devastated the hills and mountainsides near and around the pass, forcing the closure of Interstate 15. The following winter, rains in addition to burnt vegetation caused a number of landsides to further close the freeway pass.
In addition to wildfire hazards, Cajon Pass is notorious for wind hazards. In gusty conditions it is especially difficult to navigate through it as the Santa Ana winds usually push through that area. The winds sometimes reach gale-force strength. As a result, there are usually high wind advisories as well as road signs posted throughout the area. It is not uncommon to see overturned trucks during such windy weather there.
Cajon Pass gets snow occasionally, sometimes enough to close the pass temporarily. When there is snow, the California Highway Patrol will set up checkpoints on the freeway. Since most Southern Californians are without snow tires or snow chains, they are forced to turn back, or wait until the snow has stopped and the freeway has been cleared of snow.
When there is high wind or snow in the Cajon Pass, it is fairly common for weather forecasters or reporters for San Bernardino, San Diego, and Los Angeles-area televisions stations to do location reports from the Cajon Pass.
The San Andreas Fault passes through the Cajon Pass (crossing I-15 on the south side of the summit) and is responsible for the unique local geography.
Read more about this topic: Cajon Pass
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