The cold front we expected passed over my house around 8:15 last night. I wouldn't call it subtle, either:

Even that doesn't get to the truly unsubtle aspects of this frontal passage. The radar image might, though:

Not shown: the 60 km/h winds, lashing rain, brilliant lightning show, 5-10 mm hailstones, tornadoes to the northwest and southeast, and a mildly alarmed dog getting pats on the couch.
And it keeps getting better this morning. Right now I'm in a Loop high rise gently swaying in the 45 km/h winds, with the temperature continuing to drop outside:

June to January in 12 hours! Whee!
And what's the forecast for spring's first weekend? Sunny and 17°C. In fact, the weather for this week could best be summed up thus: June on Monday and Tuesday; January today; early March tomorrow followed by late March on the first day of spring; then late May/early June through the weekend with a chance of April by Tuesday.
Lunch today will be from the Chipotle across the street. Lunch yesterday involved a 30-minute break outside. Welcome to Chicago in the last days of an El Niño winter.
(Or maybe this is happening because today is Tom Skilling's last day at WGN?)