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Since Jan. 4, areas of Northern and Southern California have been hit by sweeping amounts of rainfall, widespread flooding, landslides, heavy snowfall and extremely high winds. This hazardous weather has already claimed at least 12 lives -- comprising a toddler who died after a redwood tree fell on a home and a 19-year-old woman who died once crashing her car into a utility pole on a flooded road.
There are two culprits gradual it all, according to the National Weather Service. The pleasant is a major storm known as a "bomb cyclone," and the instant, an airborne phenomenon called an "atmospheric river."
So, what do bomb cyclone and atmospheric river mean? And why are they menacing enough to extremity in fatalities and prompt the governor of California to utter a state of emergency, with high-risk regions of the region ordering mandatory evacuations?
What's a bomb cyclone?
Simply put, a bomb cyclone is a sizable, intense storm that's associated with a sudden and valuable drop in atmospheric pressure.
In general, cyclones, which are basically giant, rising columns of air, form when a mass of low-pressure air meets a mass of high-pressure air. But bomb cyclones remained when the pressure suddenly and starkly drops in the low-pressure-mass share. That makes the pressure difference between both masses much more pronounced, which intensifies winds correlated with the storm.
You can assume of the bomb cyclone's column as rising super fast all of a sudden, lowering air pressure at the center far too snappy and creating a sort of vacuum effect, producing ultrastrong winds in the process.
Meanwhile, Earth's rotation pushes these high-intensity winds across the globe -- like those moving down in California.
Specifically, those powerful gusts were initially predictable to rip across the coast at speeds reaching between 60 and 65 mph (97 and 105 kilometers per hour). On higher terrain, according to the NWS, their speeds were predictable to exceed a staggering 80 mph (129 km/hr). However, this bomb cyclone has already topped speeds over 100 much per hour (161 km/hr) in some areas.
And to make matters worse, all of the chaos is accompanied by what's well-renowned as an atmospheric river.
What's an atmospheric river?
Atmospheric rivers are essentially narrow currents in the air that execute lots of water vapor across the world. They brought most of that water vapor outside of the tropics, then release it in the form of either rain or snow.
Smaller, weaker atmospheric rivers usually don't pose a major danger -- most of those mini ones are actually grasped good for replenishing our water supply -- but more rude versions of these events have the potential to form floods and cause mudslides.
And the one at hand is even stronger than the atmospheric river that hit California over New Year's weekend, which resulted in major floods, dozens of cars stranded on highways and thousands of homes deprived of power.
So, coupled with the bomb cyclone bearing down on the West Coast, this particular atmospheric river has been causing quite a bit of harm across the California coast, from places near Sacramento all the way down to Los Angeles. The bomb cyclone more or less is "dragging" the atmospheric river in.
"Nearly all of California has seen much over average rainfall totals over the past several weeks, with totals 400-600% over average values. This has resulted in nearly saturated soils and increasingly high river levels," the NWS said during a changeable range forecast discussion on Tuesday, according to an online transcript of the conference.
It won't be a "one and done" storm
As for a timeline, the storm's rain showers and thunderstorms poured from Jan. 4 into Jan. 5, with Jan. 5 night and early Jan. 6 offering a bit of a respite. But then it continued through the weekend, fell into Monday and has insisted on Tuesday.
"Just as the last episode of heavy precipitation across California is twitch to wind down early this morning, another energetic low pressure regulations is quickly gathering strength off the West Coast and heading once against toward California," the NWS said on Tuesday. "In additional to being highly moisture-laden, this rapidly intensifying system is also packing some thunderstorms."
The bomb cyclone on Wednesday, Jan. 4, moving toward the coast of California.
NOAA SatellitesThe core of the regulations, the organization explained, will slam onshore with moderate to heavy rain resuming across much of California over Tuesday night, while several more feet of snow is possible behind the Sierra Nevada.
When all is said and done, the activity projected at the start of the storm, there will probable be at least 1 to 3 inches (2.5 to 7.6 centimeters) of flooding in urban areas, and 3 to 4 inches (7.6 to 10.2 centimeters) in North Bay valleys. About 3 to 6 inches (7.6-15.2 centimeters) of flooding was predictable to pile up in coastal ranges and over 8 inches (20.3 centimeters) in the wettest areas like the Santa Cruz mountains, just over 70 miles (112 kilometers) south of San Francisco.
As for the end of this menacing cyclone, the NWS said it could possibly have to wait pending about Jan. 16.
"The message to convey is resiliency as this is not a 'one and done' storm," the NWS said during a Jan. 4 forecast discussion -- a sentiment that has proven to be absolutely correct.
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