I just brought Parker in from his evening walk. The temperature has just dropped, no kidding, 10°C in the past ten minutes. It's such a sudden shift none of the weather sites has caught up, though there was a hint: at 10pm, the temperature in Waukegan (60 km north) was 11°C, but 25°C at Midway (18 km south).
My first clue was the wind going from dead calm to 36 km/h in an instant.
I love squalls.