Pre-War/Conflict/”Excursion” GDP, Core GDP, and Nowcasts

Key Takeaways

• GDPNow nowcast below SPF forecast
• Goldman Sachs cuts Q4 growth by 0.3 ppt
• Strait of Hormuz shutdown drives forecast revision
• Core‑GDP nowcast lags professional forecasters
• War risk introduces near‑term growth uncertainty

Summary

The Atlanta Fed’s GDPNow nowcast for Q4 2025 shows a modest slowdown, trailing the Survey of Professional Forecasters (SPF) projection. Goldman Sachs, assuming a 21‑day Strait of Hormuz disruption, trims its growth estimate from 2.5 % to 2.2 % year‑over‑year. The SPF survey, collected just before the Iran‑related conflict escalated, may already reflect early war‑risk adjustments. Core‑GDP nowcasts remain below SPF expectations, highlighting divergent views on the conflict’s near‑term economic drag.

Pulse Analysis

Nowcasting has become a vital tool for central banks to gauge real‑time economic momentum, especially when traditional data lag behind fast‑moving events. The Atlanta Fed’s GDPNow model integrates a range of high‑frequency indicators, from retail sales to industrial production, to produce a seasonally adjusted annual rate for GDP. In the latest release, the nowcast slipped beneath the Survey of Professional Forecasters, suggesting that the model is weighting early signs of reduced trade flows and consumer spending more heavily than the broader professional consensus.

Geopolitical risk, particularly the recent Iran‑related tension in the Strait of Hormuz, adds a volatile layer to macroeconomic projections. Goldman Sachs’ scenario assumes a 21‑day disruption to oil shipments, translating into a 0.3‑percentage‑point downgrade in Q4 growth. Such a shock reverberates through energy‑intensive sectors, dampens export demand, and can tighten financial conditions, prompting analysts to adjust their outlooks. The timing of the SPF survey—just before the conflict intensified—means many respondents may have only partially incorporated the risk, creating a gap between survey expectations and nowcast realities.

For policymakers and market participants, these divergent signals underscore the importance of scenario planning and flexible policy responses. A lower growth trajectory could influence the Federal Reserve’s rate‑setting calculus, potentially delaying hikes or prompting a more dovish stance. Investors, meanwhile, may re‑price exposure to energy‑linked assets and seek defensive positions. Monitoring the convergence of nowcasts, professional surveys, and private sector forecasts will be crucial as the geopolitical landscape evolves and its macroeconomic fallout becomes clearer.