National Weather Service United States Department of Commerce

Another hot couple of days are expected with heat indices climbing into the mid to upper 90s away from the lake. An isolated thunderstorm is possible west of a McHenry to Pontiac, IL line this afternoon. Cooler temperatures return mid-week, and the remnants of Subtropical Storm Alberto may bring showers and storms to the region Wednesday.
Remember to practice heat safety while enjoying the warm weather this weekend!
An Air Pollution Action Day has been extended in Illinois through Tuesday, May 29th for the Chicago metropolitan area. The air quality index is expected to be in the orange, or unhealthy for sensitive groups range. Active children and adults, especially people with pulmonary or respiratory disease such as asthma, should limit prolonged outdoor activity. More information can be found at www.airnow.gov.