Cloud layer with base and top below the station level 11 008002 Second instrument detected cloud layer 22 008002 Missing value 63 008002 Low cloud 7 008002 Cumulonimbus layer 4 008002 1 Clouds not detected below the following height(s) 6 008002 High cloud 9 008002 Observing rules for base of lowest cloud and cloud types of FM 12 SYNOP and FM 13 SHIP apply 0 008002 No clouds detected by the cloud detection system 20 008002 First instrument detected cloud layer 21 008002 2014-09-03T09:54:05.521Z Fourth instrument detected cloud layer 24 008002 Third non-Cumulonimbus significant layer 3 008002 Second non-Cumulonimbus significant layer 2 008002 Ceiling 5 008002 Vertical significance (surface observations) Third instrument detected cloud layer 23 008002 Middle cloud 8 008002 First non-Cumulonimbus significant layer 1 008002 Value not applicable 62 008002 Cloud layer with base below and top above the station 10 008002