Weather Services International, a private weather information firm, is forecasting above normal temperatures in the Northern Plains and northern Rockies in September, October and November.
"While the oppressive summer heat has at least temporarily broken across much of the northern U.S., we do expect a return to more persistent above-normal temperatures as we head into the fall season," says WSI Chief Meteorologist Todd Crawford.
"The fall pattern will generally be driven by the very strong northern Pacific Ocean signal, with significant positive ocean temperature anomalies surrounded by negative ocean temperature anomalies," he says.
"This particular setup, known as the negative phase of the Pacific Decadal Oscillation, typically changes the downstream atmospheric pattern to favor very warm temperatures across the north-central and northeastern U.S. for much of the fall season. As we near the end of fall, however, we feel that there are increasing chances for below-normal temperatures across the central and eastern US, as atmospheric blocking re-emerges."