AOPA Turbine Pilot Magazine - April 2019 - 91
P&E WX WATCH
Polar power
For bad weather down low, check the winds up high.
BY THOMAS A. HORNE
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THIS VIEW, centered on the North Pole, shows four upper-level lows and their troughs
circulating around a central low. The circumpolar vortex follows the perimeter of the
troughs, carrying jet stream winds with them.
THIS PAST WINTER, it seemed like hardly a
day passed without dire warnings about the
dreaded polar vortex. Reports of its vicious
cold-coupled with its sudden, unannounced arrival-made sure that Americans
lived under the fear of suddenly freezing
mid-stride. Its billing as a singular phenomenon, as if it were a lone, angry, rogue vortex,
only amped up the uncertainty.
But I have news. There is no single, freeroaming polar vortex. Instead, there is a huge
high-altitude (approximately 30,000 feet msl
in the winter, 50,000 feet msl in summer)
circumpolar vortex that encircles the entire
mid-latitudes of the northern hemisphere,
and it typically consists of three to six troughs
of low pressure. The troughs extend to the
south like lobes and the air beneath them
is indeed cold-or at least colder than the
warmer air south of them. What's more, this
circumpolar vortex is present year-round. Its
boundary-where cold, northern air meets
warmer air from the south-moves north and
south with the seasons.
The entire works-the polar air and its
troughs within the boundary-move west
to east in the northern hemisphere, their
movement slowly following the rotation
of the Earth beneath it. And it's what goes
on within the boundary, otherwise known
www.aopa.org/pilot AOPA PILOT | 91
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AOPA Turbine Pilot Magazine - April 2019
Table of Contents for the Digital Edition of AOPA Turbine Pilot Magazine - April 2019
Contents
AOPA Turbine Pilot Magazine - April 2019 - Intro
AOPA Turbine Pilot Magazine - April 2019 - Cover1
AOPA Turbine Pilot Magazine - April 2019 - Cover2
AOPA Turbine Pilot Magazine - April 2019 - Contents
AOPA Turbine Pilot Magazine - April 2019 - 2
AOPA Turbine Pilot Magazine - April 2019 - 3
AOPA Turbine Pilot Magazine - April 2019 - 4
AOPA Turbine Pilot Magazine - April 2019 - 5
AOPA Turbine Pilot Magazine - April 2019 - 6
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AOPA Turbine Pilot Magazine - April 2019 - 8
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AOPA Turbine Pilot Magazine - April 2019 - T-1
AOPA Turbine Pilot Magazine - April 2019 - T-2
AOPA Turbine Pilot Magazine - April 2019 - T-3
AOPA Turbine Pilot Magazine - April 2019 - T-4
AOPA Turbine Pilot Magazine - April 2019 - T-5
AOPA Turbine Pilot Magazine - April 2019 - T-6
AOPA Turbine Pilot Magazine - April 2019 - T-7
AOPA Turbine Pilot Magazine - April 2019 - T-8
AOPA Turbine Pilot Magazine - April 2019 - T-9
AOPA Turbine Pilot Magazine - April 2019 - T-10
AOPA Turbine Pilot Magazine - April 2019 - T-11
AOPA Turbine Pilot Magazine - April 2019 - T-12
AOPA Turbine Pilot Magazine - April 2019 - T-13
AOPA Turbine Pilot Magazine - April 2019 - T-14
AOPA Turbine Pilot Magazine - April 2019 - T-15
AOPA Turbine Pilot Magazine - April 2019 - T-16
AOPA Turbine Pilot Magazine - April 2019 - T-17
AOPA Turbine Pilot Magazine - April 2019 - T-18
AOPA Turbine Pilot Magazine - April 2019 - T-19
AOPA Turbine Pilot Magazine - April 2019 - T-20
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AOPA Turbine Pilot Magazine - April 2019 - Cover3
AOPA Turbine Pilot Magazine - April 2019 - Cover4
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