NOAA

Meteorologists have been talking for weeks about a snowy season ahead in the southern Rockies and the Sierra Nevada. They anticipate more storms in the U.S. South and Northeast, and warmer, drier conditions across the already dry Pacific Northwest and the upper Midwest. One phrase comes up repeatedly with these projections: a strong El Niño is coming. It sounds ominous. But what does that actually mean? We asked Aaron Levine, an atmospheric scientist at the University of Washington whose research focuses on El Niño. NOAA explains in animations how El Niño forms. What is a strong El Niño? During a normal year, the warmest sea surface temperatures are in the western Pacific and the Indian Ocean, in what’s known as the Indo-Western Pacific warm pool. But every few years, the trade winds that blow from east to west weaken, allowing that warm water to slosh eastward and pile up along the equator. The warm water causes...

As a hurricane intensifies, hurricane hunters are in the sky doing something almost unimaginable: flying through the center of the storm. With each pass, the scientists aboard these planes take measurements that satellites can’t and send them to forecasters at the National Hurricane Center. Jason Dunion, a University of Miami meteorologist, has led hurricane field programs for the National Oceanic and Atmospheric Administration. He described the technology the team uses to gauge hurricane behavior in real time and the experience aboard a P-3 Orion as it plunges through the eyewall of a hurricane. What happens aboard a hurricane hunter when you fly into a storm? Basically, we’re take a flying laboratory into the heart of the hurricane, all the way up to Category 5s. While we’re flying, we’re crunching data and sending it to forecasters and climate modelers. In the P-3s, we routinely cut through the middle of the storm, right into the eye. Picture an X p...