NASA’s 2018 Permafrost Special “All Hell Breaks Lose”
The polar jet stream can travel at speeds greater than 100 mph. Here, the fastest winds are colored red; slower winds are blue. The polar jet stream is strongest in winter when the temperature difference between warm and cold air in the Northern Hemisphere is at its highest.
Meandering around the planet like a rollicking roller coaster in the sky, the Northern Hemisphere’s polar jet stream is a fast-moving belt of westerly winds that traverses the lower layers of the atmosphere. The jet is created by the convergence of cold air masses descending from the Arctic and rising warm air from the tropics. Deep troughs and steep ridges emerge as the denser cold air sinks and deflects warm air regions north, giving the jet stream its wavy appearance. This pattern propagates across the mid-latitudes of North America, Europe and Asia, as pockets of cold air sporadically creep down from the Arctic—creating contrasting waves and flows that accelerate eastward due to Earth’s rotation. The visualization below uses weather and climate observations from NASA’s MERRA dataset to model 30 days of the jet stream’s whirling journey over North America.http://svs.gsfc.nasa.gov/vis/a010000/…
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North Pacific air moves far south bring cool air to CA. Semitropical air
masses swing up to Midwest and the North East. It is now common for the
heat back east to exceed central CA temperature (late Spring – early
summer).
We (CA) used to be the hot sunny place, not Massachusetts or Iowa.
The winds blow almost every stinking summer night! Never used to be like
that!
Yea, artic warming is causing polar jetstream goes slow
Think it’s broken.
interest