Flight Training - July 2015 - 46

WEATHER»

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fizzes out. But by then the system has
generally developed a swirl of wind,
which continues long after individual
thunderstorms in the system weaken
and die. This swirl, or vortex-called a
mesoscale vorticity center-is roughly
10,000 to 15,000 feet above the ground. It
continues moving generally toward
the east and can trigger a new MCC the
following evening.
MCCs are most common on the Plains,
often forming just east of the Rockies and
moving generally eastward. But they do
occur in other parts of the country. As a
rule, MCCs don't bring large tornadoes
or exceptionally strong winds, although
just about any thunderstorm can spin
out a weak tornado or kick up dangerous
winds.
One of the major threats they pose to
pilots is widespread areas of poor visibility and low ceilings, especially at night,
when flying in such conditions is most
dangerous.
Today, with the growing understanding of how MCCs form, move, and grow,
aviation weather forecasters take them
into account. In fact, you will sometimes
see MCCs mentioned in forecasts.
As far back as 2006, the National
Transportation Safety Board issued a
safety alert on thunderstorms, which
noted the concern that "terminology
often used by meteorologists is unfamiliar to some in the aviation community."
In February 2013 the FAA updated
Advisory Circular 00-24C to include
such terms as "mesoscale convection
complex." It replaced the thunderstorm
advisory circular that had last been
updated in 1983. The new AC is available
online (www.faa.gov/documentlibrary/
media/advisory_circular/ac%2000-24c.
pdf ).
Nevertheless, the 2014 edition of
the Pilot's Handbook of Aeronautical
Knowledge does not mention the word
"mesoscale" anywhere in its chapter on
weather theory.
Jack Williams is an instrument-rated private pilot,
and author of The AMS Weather Book: The Ultimate
Guide to America's Weather.

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Flight Training - July 2015

Table of Contents for the Digital Edition of Flight Training - July 2015