08 Jul 2022 | 01:18 PM UTC
US: Heatwave forecast to continue across southern regions through at least July 11 /update 1
High temperatures forecast to continue across parts of the southern US through July 11. Transport and power disruptions are possible.
Event
Excessive temperatures are forecast to persist across large parts of the southern tier of the US through at least July 11. Temperatures between 38-46 C (100-115 F) are expected to continue across much of the south-central and southeastern US July 8 and are beginning to build too in parts of the southwest. Temperatures may threaten records for the time of year. The heat dome is expected to shift westward July 9-10, bringing some respite to the heat for southeastern regions. As the heat shifts westward, it will suppress thunderstorm and rainfall activity associated with southwestern regions' North American monsoon season.
As of July 8, the National Weather Service has issued excessive heat warnings for parts of southeastern Kansas, northeastern Oklahoma, northeastern Texas, western, central, and eastern Arkansas, far northeastern Louisiana, southeastern Missouri, far southern Illinois, western Kentucky, western Tennessee, western and northern Mississippi, northwestern Alabama, southeastern California, and southwestern Arizona. Heat advisories have been issued across much of the rest of the affected area. Officials could update and possibly extend the coverage of weather alerts over the coming days.
The high temperatures may result in increased energy and water demand, as well as an increased risk of heat-related illnesses such as heat exhaustion and heat stroke. Authorities are advising 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 speed. 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 engines, 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.
