Why it's trending
St. Louis is trending because it is under an extreme heat warning as a heat dome brings dangerously high temperatures and humidity to the central US, affecting millions. The city's forecast of upper 90s with heat index values up to 115 has prompted alerts and concerns about power grid strain and public health.
St. Louis is under an extreme heat warning on Sunday as a heat dome expands across the central United States, pushing temperatures into the upper 90s with heat index values as high as 115 degrees. The National Weather Service warns of dangerous conditions for millions, with power demand surging across the region.
The heat dome, which has already brought triple-digit highs to cities like Phoenix, Las Vegas, and Denver, is forecast to keep St. Louis in the high 90s through at least Monday. ABC News reports that more than 100 million people nationwide are under some form of heat alert. Denver's forecast high of 102 would break its July 26 record, while Rapid City set a record 112 on Saturday.
High humidity is compounding the heat across the Plains and Midwest, with heat index values of 105 to 115 expected. Overnight lows will offer little relief, with temperatures only dropping to near 80 in cities like Kansas City and Omaha. A cold front is expected to bring some cooler weather to the Upper Midwest early this week, but dangerous heat will persist across much of the central and southern US.
Residents are urged to stay hydrated, limit outdoor activity, and check on vulnerable neighbors. Power companies in the St. Louis area are monitoring demand as air conditioning use spikes. The extreme heat is expected to last through Monday before gradually easing, though the Southwest will continue to see highs approaching 120 degrees.
Timeline
- Heat dome expands, St. Louis under extreme heat warning
A heat dome covers the central US, with St. Louis forecast to reach upper 90s and heat index up to 115. More than 100 million people under heat alerts. (ABC News, FOX 2)
- Record heat hits Rapid City
Rapid City, South Dakota, reaches 112 degrees, breaking its previous record. (ABC News)
- Heat expected to persist
Dangerous heat continues through Monday, with cold front bringing some relief to Upper Midwest early week. (ABC News, KMBC)
Questions people ask
How hot will it get in St. Louis?
St. Louis is forecast to reach the upper 90s, but high humidity will push heat index values to 105-115, according to ABC News and FOX 2 reports.
How long will the heat wave last?
The extreme heat is expected through at least Monday, with a cold front bringing some relief early next week to the Upper Midwest. However, dangerous heat may persist in the central and southern US. (ABC News)
What precautions should residents take?
Residents should stay hydrated, limit outdoor activity, and check on vulnerable individuals. Power demand is surging, and outages are possible. (FOX 2, KMBC)
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