It was a dangerous day of weather on Sunday, as tornadoes ripped through Indiana and Illinois. A powerful cold front with strong upper level dynamics (high winds way up in the atmosphere) caused the outbreak of tornadoes, damaging wind and hail.
These fronts are not uncommon for this time of year. During the transition from warmer months to cold, we get a fairly progressive pattern of fronts pushing in from Canada.
These fronts are often the focus for severe weather, but on Sunday all the ingredients came together for major severe weather. Warm, moist air was in place, a strong push of cold air behind the front, strong upper dynamics, turning of wind with height and timing of the front all lined up just right to produce a tornado outbreak.
So, a scenario like Sunday's storms is rare, but getting severe weather in November is not uncommon.
The front moved through for us during the overnight and early morning, and brought us just a few showers. We didn't have the unstable air and strong dynamics like areas to our northwest.
The cold air is rushing in now, and we'll feel it tonight and tomorrow. Overnight lows will drop back into the 30s for most spots, then tomorrow we'll only warm into the 50s.
Chilly air sticks around through midweek, then we'll start to see some clouds and milder air by late week. Showers will push through Saturday, and possibly into parts of Sunday.
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