To get a sense of how much these sources agree with each other, you can view a comparison of San Diego and the stations that contribute to our estimates of its temperature history and climate. KSAN, 56% 2 mi, -49 ft KNZY, 39% 3 mi, -39 ft KNRS, 5% 11 mi, -39 ft © OpenStreetMap contributors Ream Field (KNRS, 5%, 11 mi, south, -39 ft elevation change).Naval Air Station North Island (KNZY, 39%, 2.7 mi, southwest, -39 ft elevation change).San Diego International Airport (KSAN, 56%, 2.0 mi, northwest, -49 ft elevation change).The stations contributing to this reconstruction are: ![]() ![]() The estimated value at San Diego is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between San Diego and a given station. There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in San Diego.įor each station, the records are corrected for the elevation difference between that station and San Diego according to the International Standard Atmosphere, and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations. 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.This report illustrates the typical weather in San Diego, based on a statistical analysis of historical hourly weather reports and model reconstructions from Januto December 31, 2016. 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. La Niña is snowiest in the Cascades and northern Rockies into upstate New York and much of New England. 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. 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. 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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