2004/05/17 08:50
EGTC 170850Z 22007KT 5000 HZ NLC 19/13 Q1026

Above Metar is from Cranfield, the only translation for NLC I can find is
noctilucent cloud, but at 8:50 in the morning, also reported (as NLC without
the haze) at 9:50 (10:50 BST).

Is it a mistake or does NLC mean something else.

Thanks in advance

Joe in Bedford.