A new heat dome has tightened over the south‑central United States, sending temperatures back toward triple‑digit territory even as the region approaches the autumn equinox. The surge extends one of the most extreme warm spells on record for Texas, Oklahoma, Arkansas and neighboring states. Millions now face another week of dangerous heat, worsening air quality and the potential for storms forming along the dome’s edges as the pattern expands eastward.
The ridge arrives after a summer that broke temperature records across the Lower 48 and coincides with global heat milestones, making August 2026 one of the hottest months ever measured on Earth. The latest dome formed over familiar ground—Texas, Oklahoma, Arkansas, Louisiana and parts of the Southeast—where high pressure has repeatedly parked since spring. Even with the sun weakening as the equinox nears, temperatures are running 5 to 10 degrees above historical averages.
Highs in the upper 80s and 90s are widespread, but the core of the dome is pushing Dallas, Austin and Oklahoma City back toward 100 degrees through Saturday. That lag has allowed other ocean‑driven signals to dominate the late‑summer setup. The dome is landing on top of an already punishing season.
Dallas has recorded 49 days at or above 100 degrees—nearly double its 20‑year average—while Oklahoma City has more than tripled its typical count. September alone has delivered 10 triple‑digit days in Oklahoma City and 12 in Dallas, an uncommon but not unprecedented stretch. Austin has reached 43 days above 100 degrees, compared with a 20‑year average of 29.
El Paso has hit 52 such days, far above its typical 34. Little Rock, Tulsa and Wichita have all doubled or tripled their long‑term norms. Warm oceans are reinforcing the dome’s strength.
Those conditions have repeatedly recharged the dome as it rebuilds across the southern U.S. August 2026 tied July 2023 as the hottest month ever recorded, with global average surface temperatures reaching 16.96°C (62.5°F). Sea‑surface temperatures outside the polar regions hit their highest August values on record, averaging 21.07°C, and daily readings peaked at 21.11°C on August 24 and 25.
Extract — continue reading at the source.
