A dangerous stretch of summer heat is affecting parts of the United States, with the National Weather Service warning that heat risks are increasing across the Central U.S. and expanding toward the Ohio Valley and Mid-Atlantic.

Forecasters say high temperatures combined with humidity could create dangerous conditions, increasing the risk of heat-related illness, particularly for people spending extended periods outdoors.

Officials are urging residents to stay hydrated, avoid strenuous activity during the hottest parts of the day, and check on older adults, children and pets.

The heat isn’t the only concern. The National Weather Service is also monitoring the potential for severe thunderstorms and flash flooding in parts of the country.

Residents are encouraged to monitor their local forecasts and follow any heat or severe-weather alerts issued for their area.

Stay safe and stay informed.