A severe heat dome is currently impacting 12 U.S. states, trapping extreme heat and humidity and leading to temperatures hotter than those found in the Sahara Desert. The National Weather Service (NWS) has issued extreme heat warnings for Arkansas, Louisiana, Mississippi, Alabama, Tennessee, Florida, Georgia, and the Carolinas, which are expected to remain in effect through Monday night.
The massive high-pressure system over the Gulf Coast has been in place since last week. The heat index, which reflects the 'feels like' temperature, is predicted to reach 115 degrees Fahrenheit across the Southeast and Gulf states. Forecasters with AccuWeather anticipate that major cities such as Little Rock, Arkansas; Charleston, South Carolina; and Jacksonville, Florida, could see temperatures approaching 100 degrees Fahrenheit, potentially pushing the heat index into dangerous territory.
Officials are urging residents in the affected areas to remain indoors and in air-conditioned spaces, particularly during the afternoon and evening hours. Prolonged exposure to the heat can quickly lead to dehydration and illness. The NWS also cautioned that the trapped heat and humidity make leaving children or pets in a locked car particularly lethal within minutes.
AccuWeather Senior Meteorologist Brett Anderson stated that this level of heat poses a significant risk for heat exhaustion or worse if proper precautions are not taken. Heat advisories have also been issued for Texas, Oklahoma, and Missouri, where the heat index is expected to reach triple-digit temperatures.
The heat dome operates by trapping warm air, akin to a steam cooker, making the affected region approximately 20 degrees Fahrenheit hotter than current forecasts for the Sahara Desert, which are in the 80s and 90s. This phenomenon affects an estimated 100 million people across the impacted states.
