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A tropical low has formed in the Coral Sea. JTWC has issued a tropical cyclone formation alert on the system. 17U is expected to move westwards towards the Cape York Penisula whilst intensifying into a tropical cyclone. The westwards motion is forecast by BOM to cease before the system reaches the coast as the ridge to the south weakens and sends the cyclone back to the east. The timing of this turn is uncertain, as it does depend on the timely arrival of the trough that is forecast to break down the ridge. Conditions look generally favourable for intensification, with the system forecast to become quite intense as it moves back towards the east.

Tropical Cyclone Marcia has developed in the central Coral Sea. Tropical Cyclone Advice Number 4. Headline: Tropical Cyclone Marcia has developed and may intensify to a category 2 before landfall. Areas affected: Warning zone: Sarina to Double Island Point. Watch zone: Adjacent inland areas from Yeppoon to Double Island Point. Details of Tropical Cyclone Marcia at 7:00 pm EST: Intensity: category 1, sustained winds near the centre of 65 kilometres per hour with wind gusts to 95 kilometres per hour. Location: within 110 kilometres of 17.6 degrees South, 155.0 degrees East , 760 kilometres northeast of Yeppoon and 850 kilometres north northeast of Bundaberg . Movement: southwest at 22 kilometres per hour . Tropical Cyclone Marcia has developed over the central Coral Sea, and is slowly strengthening. During today, the system curved onto a southwesterly track, and it is expected to maintain this general motion through to landfall on the eastern Queensland coast between St Lawrence and Hervey Bay early on Friday. Marcia is expected to slowly intensify, with a high chance of reaching category 2 intensisty by landfall. A separate Severe Weather Warning is current for areas south of St Lawrence and west to the Great Dividing Range. Hazards: GALES are expected to develop about coastal and island communities between Sarina and Double Island Point on Thursday during the late afternoon or evening. Destructive wind gusts to 150 km/hr may develop about the coast and islands near the centre on Friday morning. Heavy rainfall will develop about coastal and island communities between Sarina and Double Island Point during Thursday, particularly over areas to the south of the system. A Flood Watch is current for the area. Abnormally high tides will be experienced on Thursday with water levels expected to rise above the highest tide of the year on the high tide. Coastal residents between St Lawrence and Double Island Point are specifically warned of the dangerous storm tide as the cyclone crosses the coast. The sea is likely to rise steadily up to a level well above the normal tide, with damaging waves and flooding of some low-lying areas close to the shoreline. People living in areas likely to be affected by this flooding should take measures to protect their property as much as possible and be prepared to follow instructions regarding evacuation of the area if advised to do so by the authorities. Dangerous surf is expected to develop about exposed beaches south of Sandy Cape from early Thursday. TROPICAL CYCLONE FORECAST TRACK MAP Issued at 8:04 pm EST Wednesday 18 February 2015.

A tropical low has developed in the northern Coral Sea Tropical Cyclone Outlook IDD10610 Tropical Cyclone Outlook for the Northern Region, including the Gulf of Carpentaria Issued at 2:15 pm CST on Friday 13 February 2015 for the period until midnight CST Monday 16 February 2015. Existing Cyclones in the Northern Region:Nil. Potential Cyclones: A tropical low is located in the northwest Coral Sea near Cape York and expected to remain slow moving till Sunday, before moving west into the Gulf of Carpentaria. The low will continue to develop as it moves towards the northeast coast of the Top End. Likelihood of a tropical cyclone in the Northern Region on: Saturday: Very low. Sunday: Low. Monday: Moderate. Global Models GFS Ensembles CMC Ensembles

A low has developed along the monsoon trough in Joseph Bonaparte Gulf off the west coast of the Top End, central pressure 1001 hPa. It's currently moving over land near Wyndham, WA. Over the weekend it's likely to develop further and move into the Indian Ocean next week where it's expected to develop into a tropical cyclone. VWS in the area is low to moderate and SST >30C.

After a week of (global) inactivity in tropical cyclones, a new one appears to be on the verge of forming. 04U has a large area of deep convection over and to the south of the center, as well as some banding features (especially in the south). The low is located to the southwest of Indonesia, just to the north of Cocos Island. The Bureau of Meteorology (BOM) expects the cyclone to intensify into a category 3 cyclone (Australian scale, about equal to a category 1-2 hurricane on the Saffir-Simpson hurricane scale). Regarding track, 04U will move southeastward intially, before curving back to the southwest possibly impacting Cocos Island in about 3 days. Track forecast of 04U (as of 23-12-2014, from the BOM) Sources: http://www.usno.navy.mil/JTWC/ http://www.bom.gov.au/cyclone/index.shtml http://en.wikipedia.org/wiki/Tropical_cyclone_scales