Some areas near the Top End coast have had 70 millimetres to 120mm of rain in the past few days. Nhulunbuy has picked up 130mm, their highest two-day total in 14 months.

Moisture from the monsoon is filtering south where levels are already quite high.

Alice Springs was hit by a large storm on Wednesday afternoon due to another trough, bringing a month of rain in less than two hours. The town's airport ended up with 61mm in about three hours, its heaviest downpour in nine years, which led to flash flooding.

More flooding is possible in the Alice Springs district and it may become serious if the monsoon low takes its projected path to the south. Some computer models are indicating hundreds of millimetres over the region by mid-next week, which could be devastating.

Widespread falls of 100-to-200mm are likely over nearly all of the territory by this time next week due to a monsoon, which has been largely inactive so far this month.

Alice Springs may be the wettest place in the territory by the end of the month, bringing the Todd River to life.