A large dome of high pressure is expected to expand from the Gulf Coast across the Eastern U.S. this week, bringing some of the hottest weather of the summer to the tri-state area, the mid-Atlantic, and the Great Lakes. The weather system, which traps surface heat and promotes stable, sunny conditions, is likely to push temperatures in New York City above 90 degrees by Wednesday and potentially into the triple digits in Washington, D.C.
Why the heat is intensifying
The expansion of this high-pressure dome is the primary driver for the upcoming heat. While the system is currently confined to the Gulf Coast, it is forecast to move north and east by Wednesday. This shift will trap heat near the surface and create high humidity levels. In New York City, the combination of air temperatures topping 90 degrees and tropical-feeling humidity will likely push the heat index into the triple digits.
Did You Know? A high-pressure dome functions by creating stable air and trapping heat near the surface.
What happens next
Wednesday and Thursday are expected to be the most extreme days. Residents in the mid-Atlantic, including Washington, D.C., could see air temperatures reach triple digits, even before factoring in the humidity that makes the “feels like” temperature several degrees higher. Conditions may see only slight improvements by Saturday, July 4th.
Expert Insight: The humidity creates a “feels like” temperature that increases the physiological stress on the body, making hydration and limiting outdoor exposure critical for safety.
Safety recommendations
To mitigate the risks associated with this weather, authorities advise residents to stay hydrated throughout the week. If outdoor activity is necessary, individuals should seek shade and keep their activity levels to a minimum. Wearing light, breathable clothing is also recommended to help manage the heat.
Frequently Asked Questions
When will the heat reach its peak?
Wednesday and Thursday are expected to be the most extreme days, with temperatures remaining high through the start of the July 4th weekend.
How hot will it get in New York City?
Temperatures in New York City are expected to top 90 degrees by Wednesday, with humidity levels likely pushing the heat index into the triple digits.
What should people do to stay safe?
Experts recommend staying hydrated, wearing light and breathable clothing, and avoiding prolonged time outside. If you must be outdoors, you should seek shade and minimize physical activity.
Are you prepared for the upcoming triple-digit heat index in your area?