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California’s wild weather: Fujiwhara effect, bomb cyclone



Even on the heels of an uncommon winter of intense rain, wind and snow, the storm that slammed California on Tuesday got here with some shocking situations.

The storm was marked by highly effective winds within the Bay Space and different components of Central and Northern California that downed bushes, created treacherous commuting situations, broke home windows in downtown San Francisco and brought about energy outages. The Nationwide Climate Service issued excessive wind warnings for a stretch of the coast from San Francisco to San Diego, in addition to inland areas, together with Palmdale, Lancaster and the Antelope Valley.

Fujiwhara impact

On Tuesday afternoon, because the storm approached the Bay Space, the system developed two “eyes,” or areas of low strain, leading to a “doubled-barreled blow” to San Francisco and Santa Cruz, mentioned Bay Space Nationwide Climate Service meteorologist Brian Garcia.

The uncommon incidence, generally known as the Fujiwhara impact, intensified winds because the low-pressure areas danced round one another.

Rick Canepa, a Nationwide Climate Service meteorologist in Monterey County, cited the 2 low-pressure facilities “and presumably a 3rd one which are simply form of rotating round one another.”

The phenomenon was contributing to peak gusts upward of 60 to 75 mph within the Santa Cruz Mountains, Canepa mentioned, with 50- to 60-mph winds throughout Santa Cruz and Santa Clara counties.

Bomb cyclone

UCLA local weather scientist Daniel Swain pointed to different uncommon attributes of the climate system, together with a “sting jet,” or localized acceleration of winds subsequent to a low-pressure heart.

“The title comes from the 3D visualizations of this characteristic,” he mentioned, “which look a bit bit like a scorpion’s tail descending from the sky.”

Swain mentioned in a briefing Tuesday that the system had reached the benchmark for bombogenesis, or a “bomb cyclone,” which signifies a speedy drop in strain.

Not like an earlier bomb cyclone this winter about 1,000 miles southwest of San Francisco, this one “could be very near the coast,” Swain mentioned. “So the impacts are literally extra fast and larger than they had been again then.

“The storm is absolutely raking Santa Cruz and San Mateo counties specifically,” he added as he reviewed radar photographs. “I’ve by no means seen something fairly prefer it.”

SoCal winds

Circumstances weren’t as dangerous in Southern California, which noticed regular rain Tuesday, with extra set for Wednesday.

Winds had been robust from the south — unusual for the area, the place they usually come from the west, northwest or southeast, mentioned Jonathan Porter, chief meteorologist at Accuweather.

When winds originate from unusual instructions, it will increase the chance of toppling bushes, as a result of root techniques “construct up” over time in response to extra typical patterns, Porter mentioned. That’s particularly regarding given how saturated the bottom is from current rainfall — one other issue that may make bushes prone to falling.

Landspout warning

The climate service issued particular statements masking massive swaths of Ventura and Los Angeles counties, citing the potential for pea-size hail and the potential for landspouts by late Tuesday afternoon.

Landspouts are much like tornadoes, however the circulation from the funnel begins at floor degree and is pulled up into towering cumulus clouds, based on the Nationwide Oceanic and Atmospheric Administration.

It’s unclear if any developed.

There was even a twister warning issued in Ventura County, however none had been reported.



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