This image, made from a video taken through a car window, shows a tornado near Wynnewood, Okla., on Monday. A broad tornado capable of leaving "catastrophic" damage in its wake churned across the Oklahoma landscape Monday, prompting forecasters to declare a tornado emergency for two communities directly in its path. Hayden Mahan/AP hide caption

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Despite the ongoing drought in California, the Folsom Lake reservoir is kept at only 60 percent capacity in the winter to prevent major flooding if a winter storm occurs. Some hope to prevent the waste of water by relying on more accurate weather predictions. U.S. Bureau of Reclamation hide caption

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In California, Dealing With A Drought And Preparing For A Flood
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New York City called a travel ban on vehicles in Times Square and elsewhere during last weekend's storm, which broke snowfall records all along the Mid-Atlantic coast. Yana Paskova/Getty Images hide caption

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A Big El Niño Was The Likely Instigator Of Last Week's Blizzard
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A fallen tree rests atop a pickup truck in Holly Springs, Miss., after a storm struck the town on Wednesday. A storm system killed several people as it swept across the South. Phillip Lucas/AP hide caption

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Using an instrument they've named the HOLODEC, for Holographic Detector for Clouds, scientists can now see in fine detail the way air and water droplets mix at a cloud's wispiest edge. iStockphoto hide caption

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What's At The Edge Of A Cloud?
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A photo from May shows Gino Celli checking his parched crops near his farm near Stockton, Calif. If predictions of a strong El Niño prove true, it could presage a relief from the region's prolonged drought. Rich Pedroncelli/AP hide caption

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The National Hurricane Center introduced a new storm surge forecast map this year. This map, centered on New Orleans, is a prototype. NOAA hide caption

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10 Years Since Katrina: A Look Back At The Busiest Hurricane Season
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A lot of the airborne particles in the Earth's atmosphere come from natural sources, such as desert dust (red-orange) and sea salt (blue). But there's also soot from fires (green and yellow) and sulfur emissions (white) from burning fossil fuel. William Putman/ NASA/Goddard hide caption

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