Heatwave and high humidity to blast much of US: ‘impactful to anyone’

A dangerous and prolonged heatwave is expected to affect much of the central and eastern United States for the upcoming week, with temperatures rising ahead of the Fourth of July holiday. High humidity will exacerbate the heat, creating heat indexes of 100-110°F, potentially reaching 115°F, which the National Weather Service (NWS) states could impact everyone. Millions are already under heat risk conditions, and several cities could experience their highest temperatures of the year. This heatwave is occurring alongside severe wildfire conditions developing in the West, where hot, dry, and windy weather has intensified fire activity. The NWS advises limiting outdoor activity, staying hydrated, and seeking air-conditioned spaces.

A dangerous and prolonged heat wave is expected to impact a large portion of the United States this week, with temperatures rising ahead of the July Fourth holiday. The National Weather Service forecasts high temperatures and humidity across the lower Great Lakes, mid-Atlantic, and Mississippi and Ohio River valleys. Major cities on the East Coast, in the Midwest, and in the South will experience their highest temperatures of the year so far, with heat indices potentially reaching 100 to 115 degrees Fahrenheit. Nighttime lows in the 70s and 80s will offer little relief, increasing the risk of heat-related illnesses. The heat is attributed to a high-pressure system, often referred to as a "heat dome," and is expected to persist into the following weekend across the Great Plains, Southeast, and mid-Atlantic.

Hong Kong is bracing for unstable weather ahead, with a cold front and upper-air disturbances expected to bring heavy showers on Wednesday. The Observatory has warned that temperatures will drop to as low as 20 degrees Celsius (68 Fahrenheit) by Thursday morning, with the lowest readings in urban areas. Heavy rain and squally thunderstorms are forecasted for Wednesday, followed by unsettled weather from the weekend to early next week. A trough of low pressure is expected to affect southern China during this period, leading to unstable conditions. The mercury is predicted to recover over the Labour Day weekend, with sunny periods on Friday and Saturday before showers return on Sunday. Temperatures are also expected to reach 28 degrees on these days.