About 13 billion gallons of combined storm and waste water flowed into two Cook County reservoirs this past weekend, part of the region’s network of stormwater management infrastructure.

Last fall, the Chicago Department of Public Health and the University of Illinois Chicago joined forces to install 277 air quality monitors around the city, the largest system of its kind in the United States.

Some areas reported 8 to 10 inches of rain in a 48-hour period.

It felt like 106 degrees in Chicago Tuesday, and more of the same is expected for Wednesday and Thursday as the combination of heat and humidity continue to create dangerous conditions.

Dangerous heat and humidity are expected this week, particularly Monday through Wednesday with high temperatures in the mid-90s and heat index values – what temperatures will feel like when also factoring in humidity — reaching above 105 degrees.

It’s part of a four-year upwards trend that experts say is mostly normal weather variation but could be part of long-term severe weather increases related to climate change.

As cleanup continues from last week's storms, more severe weather is in the forecast for this week, with the greatest threat on Wednesday.

The Ocean Observatories Initiative is a network of more than 900 ocean sensors built at a cost of $386 million. Over the last decade it has tracked ocean circulation, marine ecosystems, climate change and extreme weather.

The National Weather Service will be surveying damage from multiple reported tornadoes that touched down Thursday, while recovery efforts continue from the derecho that walloped Chicago on Wednesday.

The National Weather Service is tracking two rounds of severe weather Thursday.

Chicagoans should prepare for multiple rounds rounds of thunderstorms and uncomfortably hot and humid conditions on Wednesday and Thursday.

WTTW News Explains on the common myths around tornadoes and how the weather events can hit Chicago.

Since March, multiple rounds of severe storms have caused flooding, plus hail damage and even tornadoes. A warmer atmosphere can hold more moisture, and that moisture can turn into rainfall.

Thunderstorms dumped 2.43 inches of rain at O'Hare Airport, Chicago's official weather station.

Chicagoans should prepare for anything weather-wise on Tuesday as meteorologists track storms potentially developing to the west.

The Chicago White Sox home opener scheduled for Thursday was postponed due to weather. Thunderstorms are in the forecast for most of Thursday afternoon.