Which mechanism limits the poleward extent of Hadley cells diverting mid-latitude jet streams?

💡 Explanation

When air moving poleward in Hadley cells is deflected by the Coriolis Effect because the Earth is rotating, the momentum is conserved which creates an eastward deflection from pressure gradients effectively limiting the cells' poleward expansion, and creating jet streams. Therefore lateral flow and jet emergence result rather than buoyancy, pressure from heat, or shadowing all which involve different forcing mechanisms.

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