(1) What is the difference between a circle and a square?
(2) What does the "M" in the circle mean?
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Tyler Allison Good place to look for info about metar plotting can be found here:
http://aviationweather.gov/adds/metars/description2.php
"M" is no cloud conditions were transmitted
Circle = clear air
Square = auto station (no human) so the equipment thinks is clear, but don't know above 12,000 feet
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