Heat Dome Traps Central United States in Record-Breaking Temperatures

A stationary high-pressure system, described by meteorologists as a “heat dome,” is expected to dominate the central United States for the coming weekend and into next week. Forecasters estimate that about 70 million people will be under excessive-heat advisories as temperatures climb above 100 °F (37.8 °C) from Texas to North Dakota. The National Weather Service (NWS) has issued an extreme-heat warning for western Nebraska, where forecasts call for 108 °F (42 °C) on Saturday and Sunday. In addition, the NWS warned that the Denver area could see record-high temperatures, and parts of the Southwest desert may approach 120 °F (48 °C).

Associated Press

Heat domes occur when a high-pressure ridge acts like a lid, trapping warm air and preventing cooling breezes. This is the third major dome to affect the United States in the past month, following earlier events that forced Independence Day celebrations to be canceled in the East and produced a separate wave that pushed 115 °F (46 °C) in Montana. Scientists link the increasing frequency and intensity of such domes to rising concentrations of heat-trapping gases from fossil-fuel combustion.

The Guardian

• 70 million people under heat advisories (forecasters).

The Guardian

• Expected temperature range: 95-105 °F (35-40 °C) across the Gulf-to-Great-Plains corridor; isolated peaks up to 120 °F (48 °C) in desert regions.

The Guardian

• NWS extreme-heat warning for western Nebraska predicts 108 °F (42 °C).

Associated Press

• Potential record highs in the Denver metropolitan area.

The Guardian

• Heat is the deadliest weather hazard in the United States, with older adults, pregnant people, children and those with pre-existing health conditions at greatest risk.

The Guardian

“It looks like it is going to be pretty much stationary in that position as we go through the week,” — Bob Oravec Public health officials advise seeking air-conditioned spaces, staying hydrated, and limiting outdoor exposure, especially for vulnerable populations. Climate Central’s chief program officer Andy Pershing emphasized that the current event matches climate-model projections from the 1990s, underscoring the role of anthropogenic warming in amplifying heat extremes. “We are experiencing exactly what the climate models in the 1990s said we should experience now. That is more frequent, more severe heat waves, bigger temperature anomalies, more humidity, higher overnight temperatures,” — Andy Pershing, chief program officer at Climate Central, a climate change communications nonprofit

Associated Press

The prolonged heat stresses human health, strains energy grids, and heightens wildfire risk—already evident with 88 active fires across the United States. Internationally, comparable heatwaves have caused thousands of excess deaths in Europe, illustrating the global dimension of the climate crisis. Experts warn that without rapid reductions in greenhouse-gas emissions, such extreme heat events are likely to become more common and more severe. “We are experiencing exactly what the climate models in the 1990s said we should experience now,” — Andy Pershing, chief program officer at Climate Central, a climate change communications nonprofit

The Guardian