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A weather map, also known as synoptic weather chart, displays various meteorological features across a particular area at a particular point in time and has various symbols which all have specific meanings. [1] Such maps have been in use since the mid-19th century and are used for research and weather forecasting purposes.
Illinois averages around 50 days of thunderstorm activity a year which put it somewhat above average for number of thunderstorm days for the United States. Illinois is vulnerable to tornadoes with an average of 54 occurring annually, which puts much of the state at around 9.7 tornadoes per 10,000 square miles (30,000 km 2) annually.
On July 1, 1879, the Army Signal Service began taking weather observations using weather equipment at the Springer Building in Springfield becoming the first federal weather station in the region. [ 2 ] [ 3 ] Eleven years later the U.S. Weather Bureau was founded and the equipment in Springfield was transferred from the Signal Service to the ...
The National Weather Service office of Chicago has one of the longest periods of official weather records, dating back to 1870, though all the 1870 and 1871 weather records taken at 181 West Washington Street were lost in the Great Chicago Fire. Of the two major airports located in Chicago, Midway Airport began observations in 1928, and O'Hare ...
Illinois ranks second in U.S. corn production with more than 1.5 billion bushels produced annually. [155] With a production capacity of 1.5 billion gallons per year, Illinois is a top producer of ethanol, ranking third in the United States in 2011. [156] Illinois is a leader in food manufacturing and meat processing. [157]
Nearly the entire western boundary of Illinois is the Mississippi River, except for a few areas where the river has changed course. Illinois' southeastern and southern boundary is along the Wabash River and the Ohio River, whereas its northern boundary and much of its eastern boundary are straight survey (longitudinal and latitudinal) lines ...
Columbus, Ohio has a humid continental (Köppen climate classification Dfa) climate, characterized by humid, hot summers and cold winters, with no dry season. The Dfa climate has average temperatures above 22 °C (72 °F) during the warmest months, with at least four months averaging above 10 °C (50 °F), and below 0 °C (32 °F) during the ...
The Illinois–Indiana–Kentucky tri-state area within their states. Dark shaded counties were included only by WTVW prior to the rollout of digital television.. The Illinois–Indiana–Kentucky tri-state area is a tri-state area where the U.S. states of Illinois, Indiana, and Kentucky intersect, and a region of the Upland South.