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The following METAR is from Ashgabat airport (UTAA)

UTAA 071300Z 13006KT 9999 FEW050CB BKN050 BKN100 15/06 Q1013 R88/70D NOSIG

What does R88/70D mean, I couldn't find any references?

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I assume it was a typo, as R88/70D is not a correct METAR format. According to this website with historical METARs the METAR of today at 1300Z at UTAA was:

METAR UTAA 071300Z 13006KT 9999 FEW050CB BKN050 BKN100 15/06 Q1013 R88/CLRD70 NOSIG=

All other METARs from UTAA today contain "R88/CLRD70 " as well.

R88/CLRD70 means: all runways are cleared (no more deposits), and a friction coefficient of 0.70.

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  • $\begingroup$ My guess: R88: all runways, 70: friction coefficient .70, D: dry. $\endgroup$ – expeditedescent Mar 7 '19 at 20:52

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