What's more, when a high-pressure ridge is off the West Coast, it blocks incoming storms from the Pacific Ocean and weakens those that successfully pass through. The warming prevents the formation of clouds, meaning the sky is normally sunny in high-pressure areas. Air in a high-pressure area compresses and warms as it descends. Actually, Apollo was the sun god, but who wants to ruin a good story? John Wagner/Fairbanks Daily News-Miner Show More Show Lessġ8 of35 19 of35 High-pressure ridge: Elongated ridges of high pressure can move into California at any time of the year, and they're commonly associated with dry conditions.
Steve Crawford Show More Show Less 17 of35 Sun dogs: When the sun's rays pass through ice crystals in the atmosphere, mini-suns can appear at its sides, as in this photo from Fairbanks Alaska, Legend has it that the ancient Greeks figured Zeus was out walking his pooches. 14, 2018, when fallstreak clouds were spotted all over the Bay Area. A hole is left behind, which will start to expand outward as neighboring droplets start to freeze." See photos from Sept. Once the ice crystals are introduced, the water droplet quickly freeze, grow and start to fall. "Planes passing through the cloud layer can bring these ice crystals.
"These 'supercooled' water droplets need a 'reason' to freeze, which usually comes in the form of ice crystals," NWS explains. The National Weather Service explains fallstreaks occur when the water temperature in a cloud is below freezing, but the tiny water droplets forming the cloud have yet to freeze. Anthony Dunn Show More Show Lessįallstreak cloud: These stunning formations are also sometimes called hole punch clouds because it literally looks as if something punched the sky with cloud puffs dissipating from a large elliptical gap. This differs from our summer fog pattern, which typically moves inland from the Pacific. Sometimes winds sweep the fog into the San Francisco Bay Area. The season runs late fall through early spring and usually starts after the first rain. An atmospheric river carrying moisture from as far away as Hawaii to the West Coast is what's known as a "pineapple express." National Weather Service Bay Area Show More Show Less 14 of35 Tule fog: This thick ground fog settles in the San Joaquin Valley and the Sacramento Valley when the skies are clear and the temperatures are cool. The amount that falls is dependent upon the strength of the storm and its moisture content. When an atmospheric river hits land, water vapor rises and cools, unleashing precipitation. The rain is funneled into cities like San Francisco, Sacramento, Portland, and Seattle, where the runoff systems are often unequipped to deal with the days-long deluge. On the West Coast, they most often originate in the South Pacific, and, as they travel from the tropics across the ocean, they collect incredible amounts of moisture. The long plumes of water vapor in the atmosphere are like rivers in the sky-250 to 375 miles wide, on average. Atmospheric river: These supercharged storm systems are known for delivering massive amounts of snow and rainfall in a matter of days on the West Coast of the United States.
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