Ventos de Santa Ana alimentam incêndios na Califórnia (1) infographic
A infografia mostra a formação dos ventos de Santa Ana e os piores incêndios que devastam a Califórnia do Sul.
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DESASTRES

Incêndios devastadores na Califórnia

By Phil Bainbridge

January 8, 2025 - Incêndios florestais alimentados por ventos de Santa Ana – ar quente
e seco formado no Deserto da Grande Bacia no sudoeste da América –
obrigam à evacuação de mais de 100.000 habitantes da Califórnia do Sul.

Santa Ana winds are formed when a high pressure ridge forms over the the Great Basin and upper Mojave Desert which includes most of Nevada and Utah, in contrast to a low pressure area over the coast. Unlike the typical airflow at this time of year, a “kabatic” wind is generated which flows downhill, over the mountains towards Los Angeles.

The hot dry air is funnelled through the mountain valleys and canyons of the Sierra Nevada, San Gabriel and San Bernardino Mountains where the greater pressure increases the temperature. With a relative humidity of under 20%, and with typical wind speeds of 90km/h, gusting at up to 130km/h, the Santa Ana dries out vegetation so it burns more readily.

Sources
PUBLISHED: 09/01/2025; STORY: Graphic News
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