A poopy day at the airport finds you and your buddies sitting around engaged in a serious session of hangar flying. You decide to amaze the other airport bums with some interesting factoids about METARs and maybe even win a beer bet in the process. A METAR report ending in A01 or A02 is an automated station. A01 means no precipitation discriminator exists, so precipitation type cannot be reported. A02 means a precipitation discriminator does exist. The absence of A01 or A02 tells you the site is human augmented.
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