A heat dome is set to envelop the US this week, ushering in summer with scorching temperatures and oppressive humidity. Forecasters are particularly concerned about the Midwest and East Coast, where extreme temperatures are expected. This upcoming heatwave marks the first true taste of summer for many in these regions, with temperatures exceeding 90F feeling up to 20F hotter due to the humid conditions.

The heat dome, caused by a large area of high pressure in the upper atmosphere trapping heat and humidity, will bring daytime temperatures in the 90s and overnight lows only dropping to the mid-70s. Moisture from the Gulf of Mexico is fueling the muggy weather, a common occurrence during late spring and summer.

Cities like Denver, Chicago, Washington DC, and New York City are expected to experience sweltering conditions, with temperatures nearing or exceeding 100F in some areas. Several states in the Midwest face dangerous temperature impacts, with some areas in Nebraska, Kansas, Iowa, Wisconsin, Missouri, and Illinois under a category 4 rating, indicating health risks for those without proper cooling and hydration.

The combination of high temperatures and humidity can pose serious health risks, including heatstroke. To stay safe, individuals are advised to minimize sun exposure, wear light clothing, stay hydrated, and seek out air-conditioned spaces. Dry climates like Phoenix, Arizona, experience intense heat without the added humidity, allowing sweat to evaporate more efficiently.

In agricultural regions like Iowa, the phenomenon of “corn sweat” adds to the humidity during the summer months. While the humidity from crops is minimal compared to Gulf moisture, it still contributes to the overall muggy conditions. As the heatwave continues, it is crucial for individuals to take precautions to prevent heat-related illnesses and stay cool during this intense summer weather.