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The Diablo wind is created by the combination of strong inland high pressure at the surface, strongly sinking air aloft, and lower pressure off the California coast. The air descending from aloft as well as from the Coast Ranges compresses as it sinks to sea level where it warms as much as 20 °F (11 °C), and loses relative humidity.
"The term Diablo winds refers to winds that flow from east to west up and over the Diablo Range over the East Bay region of the San Francisco Bay area," AccuWeather Senior Meteorologist Dan ...
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".
Nowadays, meteorologists typically express wind speed in kilometres or miles per hour or, for maritime and aviation purposes, knots, but Beaufort scale terminology is still sometimes used in weather forecasts for shipping [4] and the severe weather warnings given to the public. [5]
"Diablo wind" is the local name for hot, dry winds from the northeast that sometimes hit the San Francisco Bay area and central coastal of California, especially in the spring and fall.
Sustained winds of 25 mph (40 kph) are expected in many areas, with possible gusts topping 55 mph (88.5 kph) along mountaintops, according to the National Weather Service. During a diablo wind, common in the fall, the air is so dry that relative humidity levels plunge, drying out vegetation and making it ready to burn. The name — “diablo ...
Diablo (hot, dry, offshore wind from the northeast in the San Francisco bay) The Hawk (cold winter wind in Chicago) Jarbo Gap Wind (associated with and often referred to as a Diablo Wind; katabatic winds in the Northern Sierra Nevada in the vicinity of Jarbo Gap, often contributing to the growth of local wildfires) [8] [9]
The fastest wind speed not related to tornadoes ever recorded was during the passage of Tropical Cyclone Olivia on 10 April 1996: an automatic weather station on Barrow Island, Australia, registered a maximum wind gust of 113.3 m/s (408 km/h; 253 mph; 220.2 kn; 372 ft/s) [6] [7] The wind gust was evaluated by the WMO Evaluation Panel, who found ...