Tropical Cyclone Technical Bulletin

Tropical Cyclone Technical Bulletin: AUSTRALIA - Queensland Issued by Australian Government Bureau of Meteorology TROPICAL CYCLONE WARNING CENTRE at: 1920 UTC 10/01/2026 Name: Tropical Cyclone Koji Identifier: 12U Data At: 1800 UTC Latitude: 19.0S Longitude: 147.9E Location Accuracy: within 30nm (55 km) Movement Towards: south (186 deg) Speed of Movement: 10 knots (18 km/h) Maximum 10-Minute Wind: 45 knots (85 km/h) Maximum 3-Second Wind Gust: 65 knots (120 km/h) Central Pressure: 990 hPa Radius of 34-knot winds NE quadrant: 80 nm (150 km) Radius of 34-knot winds SE quadrant: 120 nm (220 km) Radius of 34-knot winds SW quadrant: 20 nm (None km) Radius of 34-knot winds NW quadrant: Radius of 48-knot winds NE quadrant: Radius of 48-knot winds SE quadrant: Radius of 48-knot winds SW quadrant: Radius of 48-knot winds NW quadrant: Radius of 64-knot winds: Radius of Maximum Winds: 40 nm (75 km) Dvorak Intensity Code: T1.5/1.5/D0.5/24HRS STT:S0.0/06HRS Pressure of outermost isobar: 1000 hPa Radius of outermost closed isobar: 120 nm (220 km) FORECAST DATA Date/Time : Location : Loc. Accuracy: Max Wind : Central Pressure (UTC) : degrees : nm (km): knots(km/h): hPa +06: 11/0000: 19.9S 147.5E: 040 (075): 030 (055): 988 +12: 11/0600: 20.3S 147.0E: 050 (095): 030 (055): 992 +18: 11/1200: 20.7S 146.4E: 060 (110): 030 (055): 995 +24: 11/1800: 20.7S 145.7E: 065 (120): 025 (045): 996 +36: 12/0600: 20.4S 144.9E: 080 (150): 020 (035): 999 +48: 12/1800: 19.9S 144.1E: 090 (165): 020 (035): 1001 +60: 13/0600: 19.7S 143.5E: 080 (150): 020 (035): 1001 +72: 13/1800: 19.5S 142.7E: 110 (200): 020 (035): 1001 +96: 14/1800: 19.1S 140.4E: 150 (280): 020 (035): 1002 +120: 15/1800: None None: None (None): None (None): None REMARKS: Tropical Cyclone Koji is a broad monsoonal system which does not exhibit the structure of a standard tropical cyclone. Deep convection continues to be mostly transient with no continuous banding feature. Position based on animated EIR imagery and nearby observations at Davies Reef and radar. Gales have been observed in eastern and southern quadrants at times and are occurring at Hamilton Island to the southeast. Intensity of 45kn based upon observations and consistent with model guidance. Dvorak and satellite objective guidance aren't generally applicable to this broad system, although SATCON's 45kn estimate is consistent. Dvorak assessment yields a DT=1.5 based on MET/PAT. FT/CI set at 1.5. The environment is generally favourable with SSTs of about 28-29 degrees, strong monsoon inflow providing moisture, low vertical wind shear and dual upper level outflow channels are persisting. However, deep convection has failed to consolidate about the broad system and landfall is imminent so no intensification is possible. All guidance is consistent with weakening over land today, with a longer term track moving to the west owing to a weak low to mid-level ridge to the south. From Thursday or Friday, there is a slim chance the remnants of this system reaches the Gulf of Carpentaria waters, but at this stage it is deemed a very low risk of redevelopment. Copyright Commonwealth of Australia == The next bulletin for this system will be issued by: 11/0130 UTC. [close]