Meanders ( Rossby Waves ) of the Northern Hemisphere's polar jet stream developing ( a ), ( b ); then finally detaching a " drop " of cold air ( c ).
22.
Beginning at 0000 UTC on February 9, the two systems began an extensive merging process, with the strengthening cyclone originating from the subtropics absorbing energy from the cyclone originating from the polar jet stream.
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The 1998 El Nino has driven both the polar jet stream and the subtropical jet stream northward, leaving Texas in the middle of the subtropical jet stream, which is characterized by Pacific storms and tornadoes.
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Of course, with nature, you never know what will happen next : The polar jet stream could suddenly dip down and deliver a procession of Arctic storms that turns Northern California into an ice box.
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Day time highs during the winter usually stick around minus 2 degrees Celsius but due to the fact Sydney Mines lies around the polar jet stream they can experience arctic outbreaks and very warm thaws at times.
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At the Geophysical Fluid Dynamics Laboratory Mahlman collaborated with Syukoro Manabe to develop dynamical models of the stratospheric circulation that demonstrated the importance of meanders in the polar jet stream for producing exchange between the polar and subtropical stratosphere.
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The primary drivers of weather in the contiguous United States are the seasonal change in the solar angle, the migration north / south of the subtropical highs, and the seasonal change in the position of the polar jet stream.
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In the fall, winter, and early spring, when the polar jet stream is most active, the frequent passing of marine weather systems creates the frequent fogs, cloudy skies, and light drizzle often associated with oceanic climates.
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Areas in the southern US ( Florida, the Gulf Coast, the Desert Southwest, and southern California ) however, often have more stable weather, as the polar jet stream's impact does not usually reach that far south.
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A Pineapple Express is driven by a strong, southern branch of the polar jet stream and is marked by the presence of a surface frontal boundary which is typically either slow or stationary, with waves of low pressure traveling along its axis.
