Portside

On Monday, July 15, Chicago issued 16 tornado warnings, the most sent on a single day since 2004. In an average year, the state only experiences 50 tornadoes annually. But as the air becomes more humid, tornadoes will become more common.

Even though storm prediction is improving, tornadoes are still hard to predict, with a warning typically of only about 10 to 15 minutes. This is why tornado prediction is hard, and what's being done to improve it.