DES MOINES, IA — A long-range weather model is hinting that fall could be preparing to make a serious move south, with the 12Z GFS AI model projecting striking low temperatures for September 22nd that show 30s reaching parts of Iowa, 40s extending into Oklahoma, and 50s pushing all the way toward the Gulf Coast.
A Striking Cool Down Depicted on the Map
The projected low temperature map, valid for 12Z Tuesday, September 22nd, shows a dramatic and widespread cooldown blanketing much of the central and eastern United States. Temperatures in the 30s are shown stretching across a broad swath of the Upper Midwest and Great Lakes region, including areas surrounding Lake Michigan, Lake Huron, and Lake Erie, while 40s extend deep into the Central Plains and Ohio Valley, reaching as far south as Oklahoma.
Perhaps most notably, projected temperatures in the 50s are shown pushing all the way toward the Gulf Coast, a remarkable extent for cool morning lows this early in the fall season, suggesting that if this signal verifies even partially, much of the eastern half of the country could experience a genuinely autumn-like start to the day by late September.
A Long-Range Signal, Not a Confirmed Forecast
Meteorologists were careful to frame this projection appropriately, noting that September 22nd remains more than two weeks away from the model’s initialization date, a considerable distance for any forecast model to reliably pin down exact temperatures and their precise geographic placement. Given that distance, forecasters emphasized that the specific temperatures and boundaries shown on this particular model run will likely shift as the actual date approaches and additional data becomes incorporated into subsequent forecast runs.
Crucially, meteorologists stressed that this projection should not be interpreted as an official forecast at this stage, but rather as a long-range model signal worth watching closely as confidence in the details typically improves considerably as the timeframe in question draws nearer.
What It Would Mean if This Signal Verifies
Despite the necessary caveats surrounding a projection this far in advance, forecasters noted that if conditions anything close to what is currently depicted do verify, it would represent a major and widespread taste of fall reaching deep into the Southern United States. Temperatures in the 40s and 50s extending as far south as Oklahoma and the Gulf Coast region would mark a significant and welcome shift for areas that have experienced an extended stretch of late-summer heat throughout much of the preceding weeks…