ILLINOIS — Forecasters are warning that dangerous heat could affect Illinois during the middle of June as a broad heat wave is expected to spread across much of the United States.
According to the National Oceanic and Atmospheric Administration’s Climate Prediction Center, above-normal temperatures are forecast across the entire lower 48 states from June 11 through June 17. Illinois is expected to be among the states experiencing sustained warmth as a strong ridge of high pressure develops over much of the nation.
Meteorologists say the combination of above-average temperatures, strong June sunshine and increasing humidity could create potentially dangerous conditions across portions of Illinois. Heat index values may climb well above actual air temperatures, particularly during the hottest part of the afternoon.
The National Weather Service’s Weather Prediction Center said the developing weather pattern will promote above-average temperatures across much of the Midwest and eastern United States. Forecasters also note that warm overnight temperatures can be especially dangerous because they provide little relief from daytime heat and increase the risk of heat-related illnesses.
Weather experts explain that a ridge of high pressure causes air to sink and warm, often leading to clear skies, limited rainfall and extended periods of hot weather. These patterns are frequently associated with significant summer heat waves.
Forecasters expect the warm pattern to persist through at least mid-June, with some areas potentially experiencing several consecutive days of above-normal temperatures.
Residents are encouraged to stay hydrated, limit outdoor activity during the hottest hours of the day, wear lightweight clothing and seek air-conditioned locations when possible. Officials also remind residents never to leave children or pets unattended in vehicles, where temperatures can rise to dangerous levels within minutes.
While exact temperatures will vary across Illinois, forecasters say the state could face an extended period of dangerous heat as the mid-June pattern develops.
