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[57] [58] Because of their irregular and short-lived nature, the San Diego National Weather Service considers it "nearly impossible to forecast a Southern California tornado before it touches down." The agency utilizes a volunteer group of more than 1,300 volunteers to report local severe weather. [ 59 ]
The forecast also called for drier than average conditions across the southern United States, and wetter than average conditions in the northwest and central United States. [3] On December 4, 2024, Environment Canada released its winter outlook for December, January and February as part of their monthly climate outlooks. The agency predicted ...
The climate in the area varies drastically throughout the year. Spring in the area is warm and mild, starting in March and ending in May. Temperatures generally reach the high 60s (in March). April-Mays highs reach the 70s and 80s, and nightly lows can still be in the mid 30s (in April), although the average low is 45 to 50 °F (7 to 10 °C).
Currently, La Niña conditions are ongoing, with water temperatures in this region reaching the threshold for a La Niña in late December. This phenomenon is the cold counterpart to El Niño.
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An approaching storm system is expected to bring cold and wet conditions to Southern California this week after an unseasonably warm Christmas weekend.
Historically, the warm phase of an El Niño–Southern Oscillation (ENSO) regime typically coincides with above-average precipitation across Southern California. [28] The above-average sea-surface temperatures in the equatorial Pacific Ocean are largely responsible for this as the ocean acts as a rich moisture source for tropical moisture to ...
The Santa Anas are katabatic winds (Greek for "flowing downhill") arising in higher altitudes and blowing down towards sea level. [7] The National Weather Service defines Santa Ana winds as "a weather condition [in southern California] in which strong, hot, dust-bearing winds descend to the Pacific Coast around Los Angeles from inland desert regions".