10 0 NIL 21 1 LIGHT 32 2 MODERATE 43 3 SEVERE 54 4 NIL 65 5 LIGHT 76 6 MODERATE 87 7 SEVERE 98 8 NIL 109 9 LIGHT 1110 10 MODERATE 1211 11 SEVERE 1312 12 EXTREME, IN CLEAR AIR 1413 13 EXTREME, IN CLOUD 1514 14 EXTREME, CLOUD/CLEAR AIR NOT SPECIFIED 1615 15 LIGHT, ISOLATED MODERATE 1716 16 LIGHT, OCCASIONAL MODERATE 1817 17 LIGHT, FREQUENTLY MODERATE 1918 18 MODERATE, ISOLATED SEVERE 2019 19 MODERATE, OCCASIONAL SEVERE 2120 20 MODERATE, FREQUENTLY SEVERE 2221 21 SEVERE, ISOLATED EXTREME 2322 22 SEVERE, OCCASIONAL EXTREME 2423 23 SEVERE, FREQUENTLY EXTREME 2563 63 MISSING VALUE 26