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| Radar as of 12:30 AM CDT |
A: We tracked this cluster on radar. A few pop-up storms developed around 11 PM in southern Cook County. It started out as only a few cells. Those cells intensified and congealed into a line. Behind that line, another line of elevated storms developed. Then another line. It just wouldn't stop.
Q: Why was the thunder so loud?!?
A: Some storms just happen to have very loud thunder. These storms were in that category. Also, CAPE values were considerably high, so that likely helped the storms become very active.
Q: I heard a LOT of rainfall. How much?
A: From 1 AM to 7 AM, officially 6.91 inches of rain was measured at O'Hare Airport in Chicago. That make it the wettest day in history in Chicago.
Q: Is that rainfall total historic?
A: Yes.
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