![](http://www.aviationweather.gov/data/products/swl/ll_18_4_cl_new.gif)
[問題] 美東的low altitude charts 看起來很怪
![](http://www.aviationweather.gov/data/products/swl/ll_18_4_cl_new.gif)
等壓線很密, 簡直像個超級大颱風一樣,
已經很多天了, 今天特別明顯,
請問這在北美大陸是每年的正常現象嗎?
(是低壓, 所以又不是電影"明天過後"的情節)
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