Atlanta Fed GDP Now (Q3 26): 4.3% (prev. 5.8%)

The Atlanta Fed's GDPNow is a running nowcast, not a survey: it mechanically re-estimates the current quarter as each component release lands, so a step down of this size reflects the arithmetic of the incoming data rather than any change in judgement. Revisions of this kind have tended to follow the releases that feed the model, typically consumption, trade, inventories, and housing prints, and the model's track record is best late in the quarter and noisiest early on, which conditions how much weight a single downward step has historically carried. The transmission channel is the growth leg of the rates differential: softer nowcasts have tended to work through the front end and the belly via the expected policy path, with the dollar following the short-rate spread rather than the headline itself. The distinction worth drawing is between a revision driven by volatile components such as net exports and inventories, which have tended to be retraced, and one driven by final domestic demand, which has proven stickier. The follow-ons are the component releases that map into the next nowcast update and whether the official advance estimate confirms the direction. As a model output rather than a release, the signal is directional and revisable.