If you're in Chicago, wear layers:
The latest fall storm's "warm sector"—a prod of mild air which floods up the east side of many storms, often fueling t-storms while wrapping moisture into such systems' backside snows—is to send a brief but noticeable surge of warm into at least a portion of the metro area—primarily from the city and south suburban locations Wednesday morning. Some 16°C temperatures are possible before winds shift west and strengthen, sending temperatures diving the remainder of Wednesday into Thursday.
If the scenario unfolds as currently predicted, falling temperatures will take readings from 14.5°C lower by mid and late afternoon, situating readings near freezing at a number of locations before sunset. These would be the coldest daytime readings since April.
Check out the Tribune's graphic. Tomorrow I'll publish the actual temperatures to see how close they were.
For those keeping score, the last freezing temperature we had in Chicago occurred April 21st, but the last below-freezing reading was back on April 1st.