10 0 CIRRUS (CI) 21 1 CIRROCUMULUS (CC) 32 2 CIRROSTRATUS (CS) 43 3 ALTOCUMULUS (AC) 54 4 ALTOSTRATUS (AS) 65 5 NIMBOSTRATUS (NS) 76 6 STRATOCUMULUS (SC) 87 7 STRATUS (ST) 98 8 CUMULUS (CU) 109 9 CUMULONIMBUS (CB) 1110 10 NO CH CLOUDS 1211 11 CIRRUS FIBRATUS, SOMETIMES UNCINUS, NOT PROGRESSIVELY INVADI" NG THE SKY 1312 12 CIRRUS SPISSATUS, IN PATCHES OR ENTANGLED SHEAVES, WHICH USU" ALLY DO NOT INCREASE AND SOMETIMES SEEM TO BE THE REMAINS OF" THE UPPER PART OF A CUM 1413 13 CIRRUS SPISSATUS CUMULONIMBOGENITUS 1514 14 CIRRUS UNCINUS OR FIBRATUS, OR BOTH, PROGRESSIVELY INVADING" THE SKY; THEY GENERALLY THICKEN AS A WHOLE 1615 15 CIRRUS (OFTEN IN BANDS) AND CIRROSTRATUS, OR CIRROSTRATUS AL" ONE, PROGRESSIVELY INVADING THE SKY; THEY GENERALLY THICKEN" AS A WHOLE, BUT THE CONTI 1716 16 CIRRUS (OFTEN IN BANDS) AND CIRROSTRATUS, OR CIRROSTRATUS AL" ONE, PROGRESSIVELY INVADING THE SKY; THEY GENERALLY THICKEN" AS A WHOLE; THE CONTINUOU 1817 17 CIRROSTRATUS COVERING THE WHOLE SKY 1918 18 CIRROSTRATUS NOT PROGRESSIVELY INVADING THE SKY AND NOT ENTI" RELY COVERING IT 2019 19 CIRROCUMULUS ALONE, OR CIRROCUMULUS PREDOMINANT AMONG THE CH" CLOUDS 2120 20 NO CM CLOUDS 2221 21 ALTOSTRATUS TRANSLUCIDUS 2322 22 ALTOSTRATUS OPACUS OR NIMBOSTRATUS 2423 23 ALTOCUMULUS TRANSLUCIDUS AT A SINGLE LEVEL 2524 24 PATCHES (OFTEN LENTICULAR) OF ALTOCUMULUS TRANSLUCIDUS, CONT" INUALLY CHANGING AND OCCURRING AT ONE OR MORE LEVELS 2625 25 ALTOCUMULUS TRANSLUCIDUS IN BANDS, OR ONE OR MORE LAYERS OF" ALTOCUMULUS TRANSLUCIDUS OR OPACUS, PROGRESSIVELY INVADING T" HE SKY; THESE ALTOCUMULUS 2726 26 ALTOCUMULUS CUMULOGENITUS (OR CUMULONIMBOGENITUS) 2827 27 ALTOCUMULUS TRANSLUCIDUS OR OPACUS IN TWO OR MORE LAYERS, OR" ALTOCUMULUS OPACUS IN A SINGLE LAYER, NOT PROGRESSIVELY INV" ADING THE SKY, OR ALTOCU 2928 28 ALTOCUMULUS CASTELLANUS OR FLOCCUS 3029 29 ALTOCUMULUS OF A CHAOTIC SKY, GENERALLY AT SEVERAL LEVELS 3130 30 NO CL CLOUDS 3231 31 CUMULUS HUMILIS OR CUMULUS FRACTUS OTHER THAN OF BAD WEATHER" ,* OR BOTH 3332 32 CUMULUS MEDIOCRIS OR CONGESTUS, TOWERING CUMULUS (TCU), WITH" OR WITHOUT CUMULUS OF SPECIES FRACTUS OR HUMILIS OR STRATOC" UMULUS, ALL HAVING THEIR 3433 33 CUMULONIMBUS CALVUS, WITH OR WITHOUT CUMULUS, STRATOCUMULUS" OR STRATUS 3534 34 STRATOCUMULUS CUMULOGENITUS 3635 35 STRATOCUMULUS OTHER THAN STRATOCUMULUS CUMULOGENITUS 3736 36 STRATUS NEBULOSUS OR STRATUS FRACTUS OTHER THAN OF BAD WEATH" ER,* OR BOTH 3837 37 STRATUS FRACTUS OR CUMULUS FRACTUS OF BAD WEATHER,* OR BOTH" (PANNUS), USUALLY BELOW ALTOSTRATUS OR NIMBOSTRATUS 3938 38 CUMULUS AND STRATOCUMULUS OTHER THAN STRATOCUMULUS CUMULOGEN" ITUS, WITH BASES AT DIFFERENT LEVELS 4039 39 CUMULONIMBUS CAPILLATUS (OFTEN WITH AN ANVIL), WITH OR WITHO" UT CUMULONIMBUS CALVUS, CUMULUS, STRATOCUMULUS, STRATUS OR P" ANNUS 4140 40 CH 4241 41 CM 4342 42 CL 4459 59 CLOUD NOT VISIBLE OWING TO DARKNESS, FOG, DUSTSTORM, SANDSTO" RM, OR OTHER ANALOGOUS PHENOMENA 4560 60 CH CLOUDS INVISIBLE OWING TO DARKNESS, FOG, BLOWING DUST OR" SAND, OR OTHER SIMILAR PHENOMENA, OR BECAUSE OF A CONTINUOUS" LAYER OF LOWER CLOUDS 4661 61 CM CLOUDS INVISIBLE OWING TO DARKNESS, FOG, BLOWING DUST OR" SAND, OR OTHER SIMILAR PHENOMENA, OR BECAUSE OF CONTINUOUS L" AYER OF LOWER CLOUDS 4762 62 CL CLOUDS INVISIBLE OWING TO DARKNESS, FOG, BLOWING DUST OR" SAND, OR OTHER SIMILAR PHENOMENA 4863 63 MISSING VALUE 49