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Risk of Atmospheric River Caused California Megaflood Three Times Higher With Abrupt Climate Change
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Near the equator, and within the subtropics bracketing the equator the intense rays of the Sun heat the ocean surface a lot and cause large amounts of evaporation that feed the atmosphere with water vapour. As this water vapour moves to the northeast (in the northern hemisphere) it tends to form long filaments about a mile or so (1.6 km) above the ocean surface and several hundred miles wide, that stretch for well over a thousand miles in length. There are typically 5 or 6 of these filaments in each of the hemispheres, North and South. When global circulation patterns aim a filament to one location like California over a long period of time (such as in 1861-1862) then there is huge rainfall and a MegaFlood Event. This used to occur every 100-200 years in California, but in our climate changed warmer world it is expected to now be 3x more frequent; namely it is expected every 35 to 65 years. We are overdue.
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