![]() One such event triggered the historic February 2021 cold snap that crippled parts of the Plains, overriding the overall warm winter typically seen in the South during La Niña. When the polar vortex weakens, the cold air typically trapped in the Arctic can spill out into parts of Canada, the U.S., Asia and Europe because the jet stream becomes more blocked with sharp, southward meanders, sending more persistent cold air southward toward the mid-latitudes. ![]() How often this pattern develops in any winter season is difficult to forecast months ahead of time.īut if the Greenland block sets up frequently during a stronger El Niño winter, parts of the Southeast and mid-Atlantic can have a colder, snowier winter.Īnother winter wild card difficult to forecast months in advance is the polar vortex, a whirling cone of low pressure over the poles that is strongest in the winter months. Known to meteorologists as a Greenland block, this pattern delivers ample cold air from Canada and is an instigator for East Coast snowstorms. This leads to persistent cold temperatures and the potential for East Coast snowstorms. The area of blocking high pressure near Greenland forces a southward plunge in the jet stream across the eastern states when the North Atlantic Oscillation is in its negative phase. Track storms and monitor precipitation levels for reliable real-time updates to keep you safe. Our interactive map allows you to see the local & national weather. Stay informed about Texas weather with our interactive radar. ![]() La Niña is snowiest in the Cascades and northern Rockies into upstate New York and much of New England. See the latest North Carolina Doppler radar weather map including areas of rain, snow and ice. In some of these locations, the difference between El Niño, La Niña and neutral season snowfall is small, but a similar pattern is in place.Įl Niño tends to be snowiest in the South, including the Front Range of Colorado, and also from the Carolinas to the mid-Atlantic. What delivers the snowiest seasons? In the map below, we show whether El Niño, La Niña or a neutral season delivers the most snow. See a real view of Earth from space, providing a detailed view of. Meanwhile, less northern snowfall is typically due to the polar jet stream's northward diversion into western Canada, keeping the region warmer and/or drier than usual. Current and future radar maps for assessing areas of precipitation, type, and intensity. If there's cold enough air in place, that could fall as snow (or ice) more often than usual. The previously-mentioned, turbo-charged southern jet stream track usually brings a wetter winter to much of the South. Yellow/blue dots indicate locations that, based on National Weather Service data since 1950, see less/more snow during El Niño seasons, respectively.
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