Tropical Cyclone 03S forms off the coast of Western Australia

Tropical Cyclone 03S formed off the coast of Western Australia on January 27, 2017. It is only the third tropical cyclone to form in the 2016/17 southern hemisphere season. This is the fewest on record between January 1 and 27, according to Philip Klotzbach of the CSU.

This system first formed on January 23 in the western area of the Gulf of Carpentaria. After moving west-southwestward over land, the low gradually developed and was designated by the BOM as 14U on January 26. The JTWC began issuing advisories on January 27, classifying it as 03S as it moved over water.

TC 03S is moving further away from the coast. It might intensify over the next 24 hours but should not affect the mainland.

At 15:00 UTC on January 28, it was located approximately 250 km (216 miles) northwest of Learmonth, Australia and has tracked westward at 26 km/h (16 mph) over the past six hours, according to the JTWC.

Animated enhanced infrared multispectral satellite imagery depicts rapidly decaying deep convection over a broad low-level circulation center.

The initial intensity is assessed at 74 km/h (46 mph) based on an average of Dvorak current intensity estimates ranging from 64 km/h (40 mph) to 83 km/h (52 mph).

Tropical Cyclone 03S on January 28, 2017. Credit: NASA Aqua/MODIS

TC 03S is forecast to track westward to west-southwestward along the northern periphery of the low- to mid-level subtropical ridge over the next 48 hours.

Environmental conditions remain marginally conducive for a brief period of intensification within the next day, however, conditions will thereafter become unfavorable due to decreasing sea surface temperature and entrainment of cooler, more stable air.

Maximum significant wave height at 12:00 UTC today was 4.3 m (14 feet).

At 13:19 UTC today, BOM said that the intensity analysis of 74 km/h (46 mph) is influenced by surface observations from earlier in the day coupled with the continued quick translation speed. However, as gales are likely on the southern side only, the system is not rated at tropical cyclone intensity.

In Australia, this system is known as Tropical Low 14U.

Tropical Cyclone 03S (Tropical Low 14U) – Forecast track by BOM on January 28, 2017

The potential for the system to intensify is contingent on whether overnight convection re-develops. Forecast policy is somewhat conservatively continuing to indicate that gales may extend to northern quadrants for a brief period from Sunday morning [T+12h], BOM said.

"However, this is becoming less likely now in line with the latest model guidance, despite strong model consensus that the system will slow down on Sunday. In any case, gales are likely to continue southwest of the center for a period as the translation speed combines with the synoptic southeasterly flow."

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