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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]
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 3. stationary front 4. occluded front 5. surface trough 6. squall line 7. dry line 8. tropical wave 9. Trowal
Official monthly mean temperatures have ranged from 10.1 °F (−12.2 °C) in January 1977 to 81.3 °F (27.4 °C) in July 1955, both recorded at Midway, [18] while the annual mean temperature has ranged from 45.1 °F (7.3 °C) in 1875, as recorded at the Roanoke Building, to 54.5 °F (12.5 °C), as recorded at O'Hare. [18]
In a cold occlusion, the air mass overtaking the warm front is cooler than the cold air mass receding from the warm front and plows under both air masses. In a warm occlusion, the cold air mass overtaking the warm front is warmer than the cold air mass receding from the warm front and rides over the colder air while lifting the warm air. [2]
Let's briefly step through everything we are watching, from multiple winter storms to severe weather, flooding rain, a debris flow threat, arctic cold and even record warmth. 1. Winter Storms x 3
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 ...
Weather map at midnight on January 27, 1967. On Tuesday January 24, the maximum temperature was 65 °F (18 °C) but began to fall the next day with the passage of a marked cold front. [5] [6] In fact, the front brought arctic air from a strong 1032 mb high pressure center over the southern Canadian Prairies. By the morning of January 25, the ...
This week, the cold pattern will be periodically rejuvenated as additional shots of energy usher in more brisk Canadian air with temperatures well below the historical average.