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SAN FRANCISCO, CALIFORNIA - JANUARY 31: People are seen with umbrellas near Pier 39 during a rainy weather in Fisherman's Wharf of San Francisco, California, United States on January 31, 2025.
Potential evapotranspiration is expressed in terms of a depth of water or soil moisture percentage. If the actual evapotranspiration is considered the net result of atmospheric demand for moisture from a surface and the ability of the surface to supply moisture, then PET is a measure of the demand side (also called evaporative demand).
Areas charred by last month's wildfires in Southern California now face a new threat from a powerful, but fast-moving Pacific storm. Here's what you need to know about this threat.
Near Dublin, the California Highway Patrol reported two interstate closures due to flooding. Southbound Interstate 680 to Westbound Interstate 580 was closed due to water on the roadway.
Monthly estimated potential evapotranspiration and measured pan evaporation for two locations in Hawaii, Hilo and Pahala. Potential evapotranspiration is usually measured indirectly, from other climatic factors, but also depends on the surface type, such as free water (for lakes and oceans), the soil type for bare soil, and also the density and diversity of vegetation.
Periods of heavy rainfall caused by multiple atmospheric rivers in California between December 31, 2022, and March 25, 2023, resulted in floods that affected parts of Southern California, the California Central Coast, Northern California and Nevada. [3] [4] The flooding resulted in property damage [5] [6] [7] and at least 22 fatalities. [1]
Watch: Rain erodes California cliff prompting evacuation of nearby residences. 15:23, Louise Boyle. Watch: California storm causes fatal flooding as mass evacuations are put into effect. 15:00 ...
The Penman-Monteith equation approximates net evapotranspiration (ET) from meteorological data as a replacement for direct measurement of evapotranspiration. The equation is widely used, and was derived by the United Nations Food and Agriculture Organization for modeling reference evapotranspiration ET 0 .