Don't go outside
Thanks to the Arctic cold front, virtually every part of the central and eastern U.S. has been hit with a very fast and very steep drop off in temperatures, with many areas facing 40 degree downswings.
How much did the temperature change in an hour or less as the cold front passed? Here is a graphical depiction using the real-time mesoscale analysis grids. The grid showed max drop was near -47 degrees in NE Colorado. Included is the actual record drop trace at Cheyenne, WY.
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