https://phys.org/news/2018-09-nasa-satellite-southern-pacific-ocean.html

NASA research has found that cloud top temperatures as cold as or colder than the 70F/56.6C threshold have the capability to generate heavy rainfall.

At 11 a.m. EDT (1500 UTC), the center of Tropical Storm Liua was located near latitude 12.2 degrees south and longitude 162.5 degrees east. That's about 471 miles northwest of Port Vila, Vanuatu. Liua was moving toward the south-southwest. Liua's maximum sustained winds were near 40 mph (35 knots/62 kph) with higher gusts.