The South-Central states — record-challenging heat
BUILDING · September 18, 2026 · NO. 0918
THE DOME
The forecast risk went up while the acute count went down, which is the whole reason to read both. The national centre has record-challenging heat building over the South-Central states at Moderate to Extreme heat risk through the weekend, in the 90s to low 100s. Meanwhile Heat Advisories fell 15 to 10 across Arkansas, Mississippi, Missouri, Tennessee, Kentucky, Indiana, Illinois and Alabama, at a heat index to about 106 °F.
THE RECORD
52 turning points on record since Jun 9 — the 8 most recent shown.
Sep 17active → building
Sep 16▽ slipped down the board
Sep 15▽ eased
Sep 13easing → active
Sep 12↑ moved up the board
Sep 11building → easing · eased sharply
Sep 8easing → building
Aug 28▽ slipped down the board
WHO IT TOUCHES
Healthfloodwater reaching dense settlement on four continents, two ledgers at different vintages, and a heat tier that reaches outdoor workers
Events and venuesa national holiday weekend inside a large storm's rain shield, and outdoor crowds under record-challenging heat at the other end of the board
Agricultureharvest and livestock decisions on five continents, a monsoon that means opposite things at each end of one country, and one release a grower can read off a timetable
Energycooling load rising in one hemisphere while heating load holds in the other, and a hydropower release running to a published plan
CONNECTED
One country, one weekend, two opposite emergency postures — flash flooding from the Rockies and Plains into the Upper Mississippi Valley with a separate Florida threat, and record-challenging heat at Moderate to Extreme risk building over the South-Central states behind it.
Both American ledgers eased today while both forecasts got worse — uncontained large fires fell 61 to 56 and Red Flag warnings went 1 to 0, heat advisories fell 15 to 10, and behind them the season total stands at 56,161 fires and more than 8.5 million acres while record-challenging heat builds into the weekend.
THE ATMOSPHERE TODAY · EVENT← TODAY'S COVER