US: High temperatures forecast across central and eastern regions through at least July 30

Event

Forecast models indicate excessive temperatures are likely to persist across parts of the central and eastern US through at least July 30. A heat dome that has endured over southern and southwestern regions in recent weeks is expected to expand over the affected region in the coming days. Temperatures of around 32-41 (90-105) are possible across parts of the affected area through July 30. Authorities have declared heat emergencies in some cities, including Washington D.C. and Baltimore.

As of early July 27, the US National Weather Service (NWS) has issued excessive heat warnings across parts of northern and northeastern Kansas, southern Nebraska, south-central Minnesota, eastern and southeastern Iowa, northeastern Missouri, much of Illinois, far southeastern Pennsylvania, northern Delaware, much of New Jersey, and New York City. Heat advisories have been issued across much of the rest of the affected area. Officials could update and extend the coverage of weather alerts over the coming days.

The high temperatures may result in increased energy and water demand and an increased risk of heat-related illnesses such as heat exhaustion and heat stroke. Authorities advise the general public to avoid prolonged exposure to direct sunlight, wear loose and light clothing, and stay hydrated.

Hazardous Conditions
The extended period of oppressive heat and dry conditions may produce ideal circumstances for wildfire growth throughout the region. Heatwaves also pose a threat to vulnerable groups - such as the elderly, children, pregnant women, and those with respiratory illnesses - due to the increased possibility of heat stroke or heat exhaustion during prolonged exposure to high temperatures. These health risks could also extend to relatively healthy individuals during significant heatwave events.

Transport and Utilities
Very high temperatures may warp rail tracks and force passenger and freight trains to operate at reduced speeds. Road surface damage is also possible, and overheated vehicles may worsen traffic problems in urban areas where congestion is already a problem. Commercial trucking disruptions might occur as very high temperatures put more stress on vehicles, making tire blowouts more common. Major flight disruptions are unlikely, but general aviation disruptions are possible, and some airfreight carriers could reduce cargo loads. High temperatures could lead to an increased demand for electricity, which might trigger localized brownouts or blackouts, exacerbating hazardous conditions when air conditioning is no longer possible.

Advice

Monitor local media for weather updates and related advisories. During heat waves, remain indoors in air conditioning when possible. If outdoor activities are necessary, frequently rest in shaded areas; avoid activity during the hottest times of the day. Stay well hydrated by drinking plenty of fluids. Avoid alcoholic beverages, which are dehydrating - drink bottled water or water that has been boiled. Wear loose-fitting, light-colored clothing. Cotton fabrics are more cooling than synthetics. Promptly seek medical attention if signs of heat exhaustion or heat stroke develop. Charge battery-powered devices in case prolonged electricity outages occur.

Resources

National Weather Service