An extreme weather 'red alert' on Friday was in place in many areas of Tuscany and Emilia-Romagna amid torrential rain and flooding. In Tuscany, schools were closed in several cities including Florence where they were set to remain shut on Saturday.

In Oklahoma, red flag warnings are issued when conditions such as high temperatures, low humidity, and strong winds create a heightened risk of wildfires, urging residents to take extra precautions.

A red alert for bad weather will be in place in Tuscany and Emilia Romagna also Saturday, after Friday's, the Civil Protection department said in a fresh weather warning Friday. The department also assessed an orange alert for certain areas of Tuscany and Emilia-Romagna and a yellow alert in Umbria and parts of Lombardy,

The National Weather Service has issued a Red Flag Warning for parts of the Chicago area Friday. What does that mean and what should you know?