Posted at 10:30 a.m.
The National Weather Service has issued a Heat Advisory, in effect from noon to 7 p.m. today, Thursday, July 20. A Heat Advisory means that a period of high temperatures is expected.
Heat index values of up to around 105 degrees are expected.
The combination of high temperatures and high humidity will create a situation in which heat illnesses are possible during outdoor exertion or extended exposure.
Extended excessive heat is expected across the region through the weekend; severe thunderstorms also are possible tonight through the weekend.
Precautionary / Preparedness Actions
- Never leave children or pets alone in a closed vehicle.
- Take extra precautions if you work or spend time outside.
- When possible, reschedule strenuous activities to early morning or evening.
- Wear light weight and loose fitting clothing when possible and drink plenty of water.
- Drink plenty of fluids: Drink two to four glasses of cool fluids each hour. Your body needs water to keep cool. Drink water even if you don’t feel thirsty. Do not drink caffeinated or alcoholic beverages because they dehydrate the body.
To reduce risk during outdoor work, take frequent rest breaks in shaded or air conditioned environments such as shopping malls, etc. Resting for just two hours in air conditioning can significantly reduce heat-related illnesses. Consider spending the warmest part of the day in public buildings such as movie theaters, shopping malls and other community facilities. You can also visit one of Fairfax County’s Cooling Centers.
Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency — call or text 9-1-1 immediately.
Air Quality Alert
The Metropolitan Washington Council of Governments has issued a Code Orange Air Quality Alert today for the D.C. metro area.
A Code Orange Air Quality Alert means that air pollution concentrations within the region may become unhealthy for sensitive groups. Sensitive groups include children, people suffering from asthma, heart disease or other lung diseases and the elderly. The effects of air pollution can be minimized by avoiding strenuous activity or exercise outdoors.