 Two active monsoon troughs that also developed Typhoon Fern and Southern Hemisphere Cyclones Ophelia, Phil, and Fergus spawned Tropical Depression 43W in the South China Sea on December 21.Due to the troughs' nature, the depression headed east-southeastward, where it strengthened into the final tropical storm of the year on the 24th; Greg.After reaching a peak of winds it crossed the northern part of Borneo on the 25th.