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. Forecasts of Pacific jet variability are used to predictstratosphere-to-troposphere transport (STT) and tropical-to-extratropicalmoisture export (TME) during boreal spring over the Pacific–North Americanregion. A retrospective analysis first documents the regionality of STT andTME for different Pacific jet patterns. Using these results as a guide,Pacific jet hindcasts, based on zonal-wind forecasts from the European Centrefor Medium-Range Weather Forecasting Integrated Forecasting System, areutilized to test whether STT and TME over specific geographic regions may bepredictable for subseasonal forecast leads (3–6 weeks ahead of time). Largeanomalies in STT to the mid-troposphere over the North Pacific, TME to thewest coast of the United States, and TME over Japan are found to have the bestpotential for subseasonal predictability using upper-level wind forecasts. STTto the planetary boundary layer over the intermountain west of the UnitedStates is also potentially predictable for subseasonal leads but likely onlyin the context of shifts in the probability of extreme events. While STT andTME forecasts match verifications quite well in terms of spatial structure andanomaly sign, the number of anomalous transport days is underestimatedcompared to observations. The underestimation of the number of anomaloustransport days exhibits a strong seasonal cycle, which becomes steadily worseas spring progresses into summer.

Subseasonal prediction of springtime Pacific–North American transport using upper-level wind forecasts