Obscuration
Any phenomena in the atmosphere, excluding precipitation, that
reduces horizontal visibility. According to the National Weather
Service, some of the obstructions to visibility include blowing and
widespread dust, fog (including freezing fog and patchy fog), haze,
mist, sand and blowing sand, smoke, blowing spray, and volcanic
ash. It is reported as "X" in an observation and on the METAR.
Aero-Linx: Virtual Skies --
Aviation Navigation Tutorial
Part of the NASA VIRTUAL SKIES site, this section will introduce
you to how to use a compass, read an aeronautical chart, and plot a
course. You will learn how to calculate flight distance, flight
time and fuel consumption. You will gain an understanding of ground
track and true course and how the wind affects your flight...
“Our pilots have been laboring under substandard
bankruptcy and ATSB-era contracts for years prior to the start of
these negotiations, which have gone nowhere.”
Source: Captain Mike Cleary, president of
USAPA, in reference to USAPA's request before the NMB.
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