Storm Activity: Dec 1, 1998 - Dec 6, 1998
Dec 6 · 07:00 GMT 30 mph 1,000 mb Tropical Depression
| Dec 6 | 07:00 GMT | -21.6 | 115.4 | 30 mph | 1,000 mb | Tropical Depression | -- |
| Dec 6 | 06:00 GMT | -21.5 | 115.34 | 30 mph | 1,000 mb | Tropical Depression | -- |
| Dec 6 | 04:00 GMT | -21.3 | 115.2 | 30 mph | 1,000 mb | Tropical Depression | -- |
| Dec 6 | 03:00 GMT | -21.2 | 115.12 | 30 mph | 999 mb | Tropical Depression | -- |
| Dec 6 | 01:00 GMT | -21 | 115 | 35 mph | 998 mb | Tropical Depression | -- |
| Dec 6 | 00:00 GMT | -20.89 | 114.98 | 35 mph | 998 mb | Tropical Depression | -- |
| Dec 5 | 22:00 GMT | -20.7 | 115 | 35 mph | 998 mb | Tropical Depression | -- |
| Dec 5 | 21:00 GMT | -20.63 | 115.03 | 35 mph | 996 mb | Tropical Cyclone | -- |
| Dec 5 | 19:00 GMT | -20.5 | 115.1 | 40 mph | 995 mb | Tropical Cyclone | -- |
| Dec 5 | 18:00 GMT | -20.43 | 115.13 | 40 mph | 995 mb | Tropical Cyclone | -- |
| Dec 5 | 16:00 GMT | -20.3 | 115.2 | 40 mph | 995 mb | Tropical Cyclone | -- |
| Dec 5 | 15:00 GMT | -20.24 | 115.23 | 40 mph | 993 mb | Tropical Cyclone | -- |
| Dec 5 | 13:00 GMT | -20.1 | 115.3 | 45 mph | 990 mb | Tropical Cyclone | -- |
| Dec 5 | 12:00 GMT | -20.01 | 115.33 | 45 mph | 990 mb | Tropical Cyclone | -- |
| Dec 5 | 10:00 GMT | -19.8 | 115.4 | 45 mph | 990 mb | Tropical Cyclone | -- |
| Dec 5 | 09:00 GMT | -19.69 | 115.43 | 50 mph | 988 mb | Tropical Cyclone | -- |
| Dec 5 | 07:00 GMT | -19.5 | 115.5 | 60 mph | 985 mb | Tropical Cyclone | -- |
| Dec 5 | 06:00 GMT | -19.42 | 115.53 | 60 mph | 985 mb | Tropical Cyclone | -- |
| Dec 5 | 04:00 GMT | -19.3 | 115.6 | 60 mph | 985 mb | Tropical Cyclone | -- |
| Dec 5 | 03:00 GMT | -19.26 | 115.63 | 60 mph | 983 mb | Tropical Cyclone | -- |
| Dec 5 | 01:00 GMT | -19.2 | 115.7 | 65 mph | 980 mb | Tropical Cyclone | -- |
| Dec 5 | 00:00 GMT | -19.17 | 115.73 | 65 mph | 980 mb | Tropical Cyclone | -- |
| Dec 4 | 22:00 GMT | -19.1 | 115.8 | 65 mph | 980 mb | Tropical Cyclone | -- |
| Dec 4 | 21:00 GMT | -19.07 | 115.83 | 65 mph | 978 mb | Tropical Cyclone | -- |
| Dec 4 | 19:00 GMT | -19 | 115.9 | 70 mph | 975 mb | Tropical Cyclone | -- |
| Dec 4 | 18:00 GMT | -18.97 | 115.96 | 70 mph | 975 mb | Tropical Cyclone | -- |
| Dec 4 | 16:00 GMT | -18.9 | 116.1 | 70 mph | 975 mb | Tropical Cyclone | -- |
| Dec 4 | 15:00 GMT | -18.87 | 116.17 | 70 mph | 973 mb | Tropical Cyclone | -- |
| Dec 4 | 13:00 GMT | -18.8 | 116.3 | 75 mph | 970 mb | Tropical Cyclone | 1 |
| Dec 4 | 12:00 GMT | -18.74 | 116.37 | 75 mph | 970 mb | Tropical Cyclone | 1 |
| Dec 4 | 10:00 GMT | -18.6 | 116.5 | 75 mph | 970 mb | Tropical Cyclone | 1 |
| Dec 4 | 09:00 GMT | -18.56 | 116.54 | 75 mph | 970 mb | Tropical Cyclone | 1 |
| Dec 4 | 07:00 GMT | -18.5 | 116.6 | 75 mph | 970 mb | Tropical Cyclone | 1 |
| Dec 4 | 06:00 GMT | -18.45 | 116.63 | 75 mph | 968 mb | Tropical Cyclone | 1 |
| Dec 4 | 04:00 GMT | -18.3 | 116.7 | 80 mph | 965 mb | Tropical Cyclone | 1 |
| Dec 4 | 03:00 GMT | -18.2 | 116.76 | 80 mph | 965 mb | Tropical Cyclone | 1 |
| Dec 4 | 01:00 GMT | -18 | 116.9 | 80 mph | 965 mb | Tropical Cyclone | 1 |
| Dec 4 | 00:00 GMT | -17.93 | 116.94 | 80 mph | 966 mb | Tropical Cyclone | 1 |
| Dec 3 | 22:00 GMT | -17.8 | 117 | 75 mph | 970 mb | Tropical Cyclone | 1 |
| Dec 3 | 21:00 GMT | -17.73 | 117.03 | 70 mph | 971 mb | Tropical Cyclone | -- |
| Dec 3 | 19:00 GMT | -17.6 | 117.1 | 70 mph | 975 mb | Tropical Cyclone | -- |
| Dec 3 | 18:00 GMT | -17.54 | 117.13 | 65 mph | 976 mb | Tropical Cyclone | -- |
| Dec 3 | 16:00 GMT | -17.4 | 117.2 | 65 mph | 980 mb | Tropical Cyclone | -- |
| Dec 3 | 15:00 GMT | -17.3 | 117.25 | 65 mph | 980 mb | Tropical Cyclone | -- |
| Dec 3 | 13:00 GMT | -17.1 | 117.4 | 65 mph | 980 mb | Tropical Cyclone | -- |
| Dec 3 | 12:00 GMT | -17.05 | 117.49 | 60 mph | 981 mb | Tropical Cyclone | -- |
| Dec 3 | 10:00 GMT | -17 | 117.7 | 60 mph | 985 mb | Tropical Cyclone | -- |
| Dec 3 | 09:00 GMT | -16.97 | 117.8 | 60 mph | 985 mb | Tropical Cyclone | -- |
| Dec 3 | 07:00 GMT | -16.9 | 118 | 60 mph | 985 mb | Tropical Cyclone | -- |
| Dec 3 | 06:00 GMT | -16.87 | 118.1 | 60 mph | 985 mb | Tropical Cyclone | -- |
| Dec 3 | 04:00 GMT | -16.8 | 118.3 | 60 mph | 985 mb | Tropical Cyclone | -- |
| Dec 3 | 03:00 GMT | -16.76 | 118.43 | 60 mph | 985 mb | Tropical Cyclone | -- |
| Dec 3 | 01:00 GMT | -16.7 | 118.7 | 60 mph | 985 mb | Tropical Cyclone | -- |
| Dec 3 | 00:00 GMT | -16.7 | 118.81 | 60 mph | 985 mb | Tropical Cyclone | -- |
| Dec 2 | 22:00 GMT | -16.7 | 119 | 60 mph | 985 mb | Tropical Cyclone | -- |
| Dec 2 | 21:00 GMT | -16.67 | 119.08 | 60 mph | 985 mb | Tropical Cyclone | -- |
| Dec 2 | 19:00 GMT | -16.6 | 119.2 | 60 mph | 985 mb | Tropical Cyclone | -- |
| Dec 2 | 18:00 GMT | -16.57 | 119.27 | 55 mph | 986 mb | Tropical Cyclone | -- |
| Dec 2 | 16:00 GMT | -16.5 | 119.4 | 45 mph | 990 mb | Tropical Cyclone | -- |
| Dec 2 | 15:00 GMT | -16.47 | 119.44 | 45 mph | 990 mb | Tropical Cyclone | -- |
| Dec 2 | 13:00 GMT | -16.4 | 119.5 | 45 mph | 990 mb | Tropical Cyclone | -- |
| Dec 2 | 12:00 GMT | -16.37 | 119.53 | 45 mph | 991 mb | Tropical Cyclone | -- |
| Dec 2 | 10:00 GMT | -16.3 | 119.6 | 40 mph | 995 mb | Tropical Cyclone | -- |
| Dec 2 | 09:00 GMT | -16.24 | 119.66 | 40 mph | 995 mb | Tropical Cyclone | -- |
| Dec 2 | 07:00 GMT | -16.1 | 119.8 | 40 mph | 995 mb | Tropical Cyclone | -- |
| Dec 2 | 06:00 GMT | -16.05 | 119.87 | 40 mph | 996 mb | Tropical Depression | -- |
| Dec 2 | 04:00 GMT | -15.9 | 120 | 35 mph | 1,000 mb | Tropical Depression | -- |
| Dec 2 | 03:00 GMT | -15.76 | 120.04 | 35 mph | 1,000 mb | Tropical Depression | -- |
| Dec 2 | 00:00 GMT | -15.13 | 120.1 | 30 mph | 1,001 mb | Tropical Depression | -- |
| Dec 1 | 22:00 GMT | -14.6 | 120.1 | 30 mph | 1,002 mb | Tropical Depression | -- |
Learn more about Tropical Cyclone Billy and the 1999 Southern Hemisphere hurricane season in our hurricane archive.
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