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Weather pattern of the North American monsoon Typical precipitation pattern of the North American monsoon (green arrow). The North American monsoon is a complex weather process that brings moisture from the Gulf of California (and to lesser extent the eastern Pacific and Gulf of Mexico) over northwestern Mexico and southwestern US resulting in summer thunderstorms, especially at higher elevations.
[30] [31] Tropical cyclones from the eastern Pacific contribute to the moisture within the monsoon system, and bring up to 20 percent of the average annual rainfall to southern California. [32] Flash flooding is a serious danger during the monsoon season. Dry washes can become raging rivers in an instant, even when no storms are visible as a ...
In July 2021, monsoonal showers brought rain as far west as Hermosa Beach, California, with Downtown Los Angeles recording 0.18 of an inch of rain in a 24-hour period. But before everyone starts ...
The city's stormwater system was overwhelmed as its infrastructure was unable to cope with the sudden amount of rain, causing many homes to be flooded and Mayor Todd Gloria to declare a local emergency. [71] The floods displaced 1,225 households in the San Diego region and caused about $31 million in damages. [72]
Of the major monsoon systems, only the North American monsoon is expected to have substantial decreases in total precipitation, with the most likely outcome being a 1%-6% reduction in summer rainfall.
Southern California's monsoon season looks like it's extending past September, but experts say it's a mirage. Rain isn't expected in the L.A. area Thursday and Friday.
East Los Angeles, the Gateway Cities, and parts of the San Gabriel Valley average the warmest winter high temps (72 °F, 22 °C) in all of the western U.S., and Santa Monica averages the warmest winter lows (52 °F, 11 °C) in all of the western U.S. Palm Springs, a city in the Coachella Valley, averages high/low/mean temperatures of 75 °F/50 ...
As an annual weather pattern known as the North American monsoon continues to bring much-needed rain to the southwestern United States, moisture is forecast to expand over the West and bring the ...