Which atmospheric phenomenon results when the subtropical jet stream weakens poleward of Hadley cells during summer?

💡 Explanation

When the subtropical jet weakens, mid-latitude high and low pressure systems meander more because the steering force diminishes, leading to prolonged hot, dry spells and increased thunderstorm activity due to stalled fronts. Therefore severe thunderstorms occur, rather than coastal upwelling, polar vortex intensification, or decreased cyclone formation which require different mechanisms related to ocean currents, high-latitude cooling, or Coriolis forces respectively.

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