A warm front sweeping across the nation is responsible for some stunning surges in temperature.

Perhaps the most dramatic is occurring today in Sioux City, Iowa where the temperature sky-rocketed from 54 degrees this morning to a sizzling 106 degrees (so far) this afternoon – a 52 degree spike. 106 is also its hottest temperature on record during the month of May (dating back to 1889), and the hottest before June 7 (when it has hit 107). Incredibly, the temperature there was just 40 degrees Monday morning, 66 degrees cooler than this afternoon.

Less dramatic, but still impressive, a number of cities in the Midwest are experiencing 40-50+ degree spikes since Monday morning, including Chicago and Minneapolis.

Here’s a table of observed Monday morning lows and forecast highs today in several cities, prepared by AccuWeather.com


The D.C. area, which saw lows ranging from the low 30s to low 40s today, will bounce into the low-to-mid 80s tomorrow after the warm front crosses, completing its own 40-50 degree swing in less than 36 hours.

Temperature difference from average starting this morning and ending tomorrow evening. (WeatherBell.com)

Related: The wildest temperature swings