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  For more than 20 years Earth Networks has operated the world’s largest and most comprehensive weather observation, lightning detection, and climate networks.
  
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Dangerous windy conditions are likely to pound the Desert Southwest today as a Santa Ana pattern takes shape, bringing the threat of wildfires and power outages from California to Nevada and Arizona.

The Santa Ana pattern is related to the same storm system that is causing a punch of wintry weather into the southern Rockies and southern Plains. Sustained winds across the higher terrain around Los Angeles and San Francisco are expected to reach 40 to 50 mph with gusts as high as 70 mph. Even in the foothills, including Ontario, Burbank and Palm Springs, Calif., could see gusts pushing 60 mph.

Gusts of 89 mph have been measured in the mountains of Sonoma County, northern California with a gust of 96 mph reported in the San Gabriel mountains of southern California. A WeatherBug Live Tracking Station at the Hollywood Bowl reported a gust to 54 mph earlier today, and a station near the Ontario airport gusted to 109 mph.

The air is beyond tinder-dry, with dewpoints – a measure of how dry the air is – running at 10 to as much as 30 degrees below zero. This means that just one spark could start a fire.

These strong winds could rip down tree branches or even whole trees and could lead to power line damage. Be prepared for power outages from this storm. Worse still, the strong northeasterly winds will be very dry in nature and could quickly spread any sparks into raging wildfires. California utilities have already cut power to locations vulnerable to wildfires.

High Wind Warnings and Red Flag Warnings are in place across most of California, southern and central Nevada, southwestern Utah and western Arizona.

If you have any outdoor fall decorations, be sure to tie them down or bring them inside to prevent them from becoming airborne. If you are planning outdoor activities involving a fire, use extreme caution with your fire to keep it from spreading.

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Santa Ana Winds Invade Southwest