On February 14, the difference between morning surface temperature (7 AM EST) at Minneapolis and Miami was 94.5°F, the 4th largest on record since 1973.
— NWS Weather Prediction Center (@NWSWPC) February 17, 2021
Quick approximation of the air mass contrast to the east of the Rockies using 12Z soundings. Record 102.9°F on 2 Feb 1996. pic.twitter.com/Vm8EoJnPOh