What natural phenomenon occurs regularly in northern Australia during the wet season?

In northern Australia, the wet season is characterized by the occurrence of monsoons, which are seasonal wind patterns that bring significant rainfall. The climate in this region is heavily influenced by the Australian monsoon, resulting in distinctive wet and dry seasons. During the wet season, which typically runs from November to April, warm, moist air flows from the northern tropics, leading to heavy showers and thunderstorms. This influx of moisture is essential for replenishing water supplies, supporting agriculture, and sustaining the diverse ecosystems in the area.

The other natural phenomena listed, such as droughts, hurricanes, and tornadoes, do not occur regularly in this region during the wet season. Droughts are the opposite of the monsoon season, representing prolonged dry periods, while hurricanes (or cyclones in Australian terminology) do occur but are less common and not as predictable as the monsoonal rains. Tornadoes are incredibly rare in Australia and generally do not form in the northern regions when monsoons are present. Thus, the regularity and significance of monsoons during the wet season in northern Australia make them the correct choice.