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Abandoned vehicles on Lake Shore Drive in Northern Illinois after a large snowstorm. Extreme temperature changes can occur within minutes with the passage of a strong cold front through the state. On December 20, 1836, temperatures fell 40 °F or 22.2 °C in minutes, which supposedly froze people to their saddles and chickens in their tracks. [8]
The weather associated with an occluded front includes a variety of cloud and precipitation patterns, including dry slots and banded precipitation. Cold, warm and occluded fronts often meet at the point of occlusion or triple point. [28] A guide to the symbols for weather fronts that may be found on a weather map: 1. cold front 2. warm front
Warm fronts are at the leading edge of a homogeneous advancing warm air mass, which is located on the equatorward edge of the gradient in isotherms, and lie within broader troughs of low pressure than cold fronts. A warm front moves more slowly than the cold front which usually follows because cold air is denser and harder to lift from the ...
NOAA map shows when the average coldest day of the year typically occurs in the United States: From the Northern Plains to the Midwest, Southeast and Northeast, the last two weeks of January are ...
The effects of the cold front did not affect many suburban areas, as temperatures reached or exceeded 100 °F (38 °C) for a fourth consecutive day throughout much of the region. During the summer, Lake Michigan continues to have an effect on Chicago weather, but it is not as common or as strong as it is during the spring months.
Illinois has a continental climate, with large temperature extremes not moderated by either mountains or oceans. Weather is influenced primarily by cold Canadian Arctic air in the winter, and warm, humid air from the Gulf of Mexico in the summer. High temperatures in the south of the state are about 10 to 12 °F. warmer than the north.
A statement accompanying the forecast adds, “After a weird and warm winter season last year, this winter should make cold weather fans rejoice — especially those in the Great Lakes, Midwest ...
A warm front is a density discontinuity located at the leading edge of a homogeneous warm air mass, and is typically located on the equator-facing edge of an isotherm gradient. Warm fronts lie within broader troughs of low pressure than cold fronts, and move more slowly than the cold fronts which usually follow because cold air is denser and ...