AOPA Pilot Magazine - August 2019 - 89

degrees Celsius or less define a mesoscale
convective complex.)
Unlike the visible product, infrared satellite imagery's different wavelength means
that it works both day and night. It may not
show cloud contours with as much resolution, but you can still identify low and
high clouds, and see them move on looping
frames. Its biggest shortcoming crops up in
the colder months of the year, when terrain
can be as cold as the clouds and you can't
distinguish between the two. Looping may
help sort this out, and so will any river or
lake patterns.
Water vapor. Water vapor is present
everywhere in the atmosphere, but less so in
the thin air at the highest levels of the troposphere. Water vapor imagery will readily
identify the more dense, moisture-laden
clouds in the 11,000- to 34,000-foot range,
but any radiation emitted by water vapor at
lower altitudes will be absorbed by higher
cloud layers, and not detectable. So for seeing lower cloud layers it's not very useful.
And remember that just because a water
vapor image shows high levels of moisture
does not necessarily mean that rain is falling.
On the other hand, if no high cloud
layers are present it's possible to see subtle circulation patterns that wouldn't
show up on visible or infrared imagery.
Meteorologists use water vapor imagery
to help identify winds aloft and large-scale
circulation patterns.
Bottom line: Remember that visible
imagery shows how thick or thin cloud layers may be; infrared pins down how high
or low they are; and water vapor shows the
densest concentrations of moisture. When
all three image types show coinciding patterns, you can be sure that those locations
bear further checking.
Your next stop might be to check radar
imagery for any signs of dense precipitation
and thunderstorms, or click on aviationweather.gov's Vis/Fog button to see a hybrid
visible/infrared image that shows low clouds
in brighter shades-and also has symbols
showing whether VMC or IMC conditions
exist at certain airports. But to me, METARs
and TAFs are better sources of current or
impending instrument weather.
AOPA
EMAIL tom.horne@aopa.org

aopa.org/pilot AOPA PILOT | 89

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AOPA Pilot Magazine - August 2019

Table of Contents for the Digital Edition of AOPA Pilot Magazine - August 2019

Contents
AOPA Pilot Magazine - August 2019 - Intro
AOPA Pilot Magazine - August 2019 - BB1
AOPA Pilot Magazine - August 2019 - BB2
AOPA Pilot Magazine - August 2019 - Cover1
AOPA Pilot Magazine - August 2019 - Cover2
AOPA Pilot Magazine - August 2019 - Contents
AOPA Pilot Magazine - August 2019 - 2
AOPA Pilot Magazine - August 2019 - 3
AOPA Pilot Magazine - August 2019 - 4
AOPA Pilot Magazine - August 2019 - 5
AOPA Pilot Magazine - August 2019 - 6
AOPA Pilot Magazine - August 2019 - 7
AOPA Pilot Magazine - August 2019 - 8
AOPA Pilot Magazine - August 2019 - 9
AOPA Pilot Magazine - August 2019 - 10
AOPA Pilot Magazine - August 2019 - 11
AOPA Pilot Magazine - August 2019 - 12
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AOPA Pilot Magazine - August 2019 - 21
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AOPA Pilot Magazine - August 2019 - R-1
AOPA Pilot Magazine - August 2019 - R-2
AOPA Pilot Magazine - August 2019 - R-3
AOPA Pilot Magazine - August 2019 - R-4
AOPA Pilot Magazine - August 2019 - R-5
AOPA Pilot Magazine - August 2019 - R-6
AOPA Pilot Magazine - August 2019 - R-7
AOPA Pilot Magazine - August 2019 - R-8
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AOPA Pilot Magazine - August 2019 - 50
AOPA Pilot Magazine - August 2019 - 51
AOPA Pilot Magazine - August 2019 - 52
AOPA Pilot Magazine - August 2019 - 53
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AOPA Pilot Magazine - August 2019 - 58
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AOPA Pilot Magazine - August 2019 - 61
AOPA Pilot Magazine - August 2019 - 62
AOPA Pilot Magazine - August 2019 - 63
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AOPA Pilot Magazine - August 2019 - Cover3
AOPA Pilot Magazine - August 2019 - Cover4
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