A significant heat dome is currently affecting the Eastern U.S., creating life-threatening heat conditions for millions as daytime temperatures soar into the 90s and low triple digits.

Factors such as high humidity can exacerbate heat-related illnesses, making it harder for the body to cool itself, particularly affecting vulnerable populations like young children and the elderly.

Outdoor activities should be carefully scheduled to account for the extreme temperatures and humidity, with recommendations to limit exertion, take frequent breaks, and utilize cooling methods like misters and fans.

Proper hydration is crucial during these conditions, as the body needs to be sufficiently hydrated to sweat effectively; dehydration can drastically impair bodily functions.

The CDC recommends drinking water every 15-20 minutes during heat waves, and suggests using sports drinks with electrolytes for those engaged in physical activities.

Monitoring urine color can help indicate hydration levels, with darker urine signaling potential dehydration or muscle breakdown.

Heat cramps are often the earliest sign of heat illness, indicating fluid and electrolyte loss, which can progress to heat exhaustion characterized by profuse sweating, increased heart rate, and decreased blood pressure.

Stephen P. Wood, director of Northeastern University's Extreme Medicine Certificate Program, emphasizes the importance of recognizing heat illness symptoms and the rapid progression from heat exhaustion to heat stroke.

Heat stroke occurs when the body's mechanisms to dissipate heat fail, leading to dry skin, confusion, and potentially multi-system organ failure if not treated promptly.

During extreme heat, the body's internal temperature can rise from normal ranges to dangerous levels, necessitating aggressive cooling methods such as ice baths.