Where can a strong wind shear be expected concerning a jetstream core?

Strong wind shear is typically observed on the low-pressure side of a jetstream core, particularly where the wind speed exceeds 110 knots. This phenomenon occurs because the jetstream represents a boundary where different air masses interact, leading to significant changes in wind speed and direction over a relatively short distance.

When air flows into a jetstream, it accelerates and causes a gradient of wind speeds around the core. On the low-pressure side, the substantial difference in speeds creates notable wind shear, which can have important implications for aviation, including turbulence and changes in flight conditions.

A key characteristic of jetstreams is their association with frontal systems, and the strongest wind shear tends to occur where the dynamics of the jetstream enhance the mixing of air masses. This high-speed area, particularly when exceeding 110 knots, contributes to the turbulence that can pose challenges for aircraft navigating in and out of these regions.

The other contexts provided by the choices do not align with the behavior of wind shear in relation to jetstreams, particularly the high-pressure side or a stable air mass, where wind shear is generally not as pronounced. Near the surface of the jetstream isn't typically where the most significant shear is concentrated either; instead, the greatest effects tend to occur nearby the