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Tropical cyclones and their remains occasionally move into the region from the south and southwest. [67] Recently, the region has experienced a couple heavy rainfall events that exceeded the 50-year return period, during October 1996 and October 1998, which suggest an increase in heavy rainfall along the coast. [61]
Northwestern California has a temperate climate with rainfall of 15 inches (380 mm) to 50 inches (1,300 mm) per year. Some areas of Coast Redwood forest receive over 100 inches (2,500 mm) of precipitation per year. The Central Valley has a wide range of precipitation.
Tropical cyclones from the eastern Pacific bring nearly 20 percent of the average annual rainfall to southern California. [1] The average storm total rainfall for a tropical cyclone impacting the contiguous United States from the Atlantic basin is about 16 in (410 mm), with 70 to 75 percent of the storm total falling within a 24‑hour period.
July 20–21, 1902 – A tropical cyclone struck the southern Baja California peninsula and dissipated, although the monsoon drew its moisture northward. San Diego recorded 0.83 in (21 mm), which was the highest July rainfall total for the city until 2015 when it was surpassed by Hurricane Dolores.
Tallest non-tropical thunderstorm The official confirmed tallest thunderstorm was a supercell that occurred on May 24, 2016 near Nueva Rosita, in rural areas of the Mexican state of Coahuila, in the Big Bend area of the Rio Grande basin. This storm had a cloud top height of 68,000 ft (21 km; 12.9 mi).
Crews in mountain and desert towns worked to clear away mud and debris Tuesday in the aftermath of the first tropical storm to hit Southern California in 84 years. Hilary dumped record rainfall ...
Los Angeles averages only 14.7 inches (373 mm) of precipitation per year, and this is lower at the coast and higher in the mountains and foothill cities. [24] Snow is extremely rare in the Greater Los Angeles area and basin, but the nearby San Gabriel Mountains and San Bernardino Mountains typically receive a heavy amount of snow every winter ...
The Köppen climate classification is the most widely used climate classification system. [2] It defines a tropical climate as a region where the mean temperature of the coldest month is greater than or equal to 18 °C (64 °F) and does not fit into the criteria for B-group climates, classifying them as an A-group (tropical climate group). [3]