We have had two previous occasions to look into "Cut Off Lows" at jet stream level in the atmosphere. When Hurricane Irene left behind a upper cut off low and a few weeks later when one sat over top of us for more than a week we enjoyed extended periods of wet weather.
Because these lows are pools of cool air isolated from the main jet stream they travel only slowly until they are re-absorbed by the jet.
Now as the video below shows another cutoff low will make a visit to the tristate but this one will not linger long.
Having experienced that phenomena in Texas, I would say that it gets pretty humid and hot for a week. It is almost unreal. The vortex above is sucking the cool air. It can even spawn a tornado in some extreme cases.
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