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A dangerous winter storm is slamming Northern California with rare blizzard conditions and fierce winds as it threatens to unload up to 10 feet of snow in the mountains and snarl travel.
Red flag warnings are in place for Southern California due to Santa Ana winds that will bring gusts up to 65 mph and “extremely rare and dangerous” fire weather conditions.
Another day of gusty winds is forecast Wednesday for Southern California, where a rare "Particularly Dangerous Situation" red flag warning continues until 3 p.m. for western Los Angeles County and ...
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".
Severe is defined as hail 1 to 2 inches (25 to 51 mm) diameter, winds 58 to 75 miles per hour (93 to 121 km/h), or a tornado. [ 11 ] Significant severe is defined as hail 2 inches (51 mm) in diameter or larger, winds 75 mph (65 knots, 120 km/h) or more, or a tornado of strength EF2 or stronger.
Occurring about 10 days out of the year, these winds bring sometimes hot, but always dry conditions. Inland, and in mountain passes and canyons, they can burst out in gusts of 100 miles per hour (160 km/h) and can lower relative humidity to single digits, although by the coast they rarely see gusts of over 40 miles per hour (64 km/h).
The National Weather Service issued high surf advisories Thursday morning for Northern California, with 20-to-30-foot waves expected through Sunday.
For example, the average daily high in San Francisco in July and August is between 62 and 68 °F (17 and 20 °C), [1] [2] and in Walnut Creek, some 20 miles (32 km) inland, the average daily high in July and August is 84 °F (29 °C): a temperature gain of more than one degree (Fahrenheit) per mile. [3]