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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".
The events included Santa Ana winds of exceptional intensity, with forecasted gusts reaching 50 to 80 miles per hour (80 to 130 km/h; 22 to 36 m/s) in populated areas of the Los Angeles and Ventura counties, including the San Gabriel Valley and the Los Angeles Basin which in prior wind events had been protected by their lower elevations.
The Santa Ana winds of Southern California can be visualized in several ways. You can see their effects as palm trees sway in the morning light or when clean-up crews arrive to deal with branches ...
It quickly spread due to a combination of severe drought in Southern California (the driest 9-month period on record), and a worsening Santa Ana wind event which created wind gusts up to 80 mph (130 km/h). [12] [13] Within 20 minutes, the fire grew from 20 acres (8.1 ha) to 200 acres (81 ha).
Northeasterly winds will frequently gust to 50-60 mph, but powerful gusts in the neighborhood of 80 mph are forecast in the mountains with an AccuWeather Local StormMax™ of 100 mph.
A Catalina eddy is rarely prolonged. As the heat over the deserts causes air to rise, the resulting pressure gradient and increase in the normal onshore winds causes the vortex to dissipate. The result is the common local weather forecast calling for "late night and early morning low clouds and fog, followed by afternoon sunshine and sea breezes."
At 1930Z, a tornado watch was issued in New Mexico and Texas, where supercells were expected to develop and bring large hail up to 2.5 in (6.4 cm) and severe wind gusts of up to 70 mph (110 km/h), with tornadic potential being likely to develop later that evening. [6]
Wind gusts approached 100 mph (160 km/h), causing snowdrifts to reach heights of 25 ft (7.6 m) in some areas, making roadways impassable. Storm reached maximum intensity over southern Ontario Canada. Northeastern United States Blizzard of 1978 – February 6–7, 1978.