A weaker jet stream can significantly influence weather patterns and contribute to extreme weather events in several ways. Here’s how it relates to your points:
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It would create thicker: A weaker jet stream can lead to a more stable atmosphere, which might allow for the buildup of thicker cloud cover. This can result in prolonged precipitation events.
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It would create high winds that move storm systems: A weaker jet stream does the opposite; it tends to reduce the strength of winds aloft that typically help move storm systems along. Instead, storms may linger longer in one area.
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It would cause increased evaporation: While the jet stream primarily affects wind patterns and storm movement, the localized weather conditions influenced by a weakened jet stream can create situations where increased temperature and higher humidity lead to greater evaporation.
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It would allow storm systems to stall in an area: This is one of the most significant impacts of a weaker jet stream. Storm systems can become "stuck" or stall in one region, leading to prolonged periods of heavy rain, flooding, or extreme weather events, as the air mass stays in one place for an extended time.
In summary, the most direct effect of a weaker jet stream is that it would allow storm systems to stall in an area, which can lead to severe weather conditions.