| Category 1 tropical cyclone (Aus scale) | |
|---|---|
| Cyclone (SSHWS) | |
 Cyclone Mangga nearing its extratropical transition on May 23 | |
| Formed | May 19, 2020 |
| Dissipated | May 25, 2020 |
| (Extratropical after May 23) | |
| Highest winds | 10-minute sustained: 65 km/h (40 mph) 1-minute sustained: 65 km/h (40 mph) |
| Lowest pressure | 995 hPa (mbar); 29.38 inHg |
| Fatalities | None reported |
| Damage | > $1 million (2020 USD) |
| Areas affected | Western Indonesia, Cocos Islands, Christmas Island, Western Australia |
| Part of the 2019–20 Australian region | |
Meteorological history edit
Tropical storm (39–73 mph, 63–118 km/h)
Category 1 (74–95 mph, 119–153 km/h)
Category 2 (96–110 mph, 154–177 km/h)
Category 3 (111–129 mph, 178–208 km/h)
Category 4 (130–156 mph, 209–251 km/h)
Category 5 (≥157 mph, ≥252 km/h)
Unknown
Extratropical cyclone, remnant low, tropical disturbance, or monsoon depressionAfter being mostly indiscernible for the preceding week, the Madden–Julian Oscillation (MJO) redeveloped over the central equatorial Indian Ocean during mid May, and began to track towards the Maritime Continent. The return of an active pulse of the MJO led to an increase in cloudiness and convective activity across the region, and also contributed to the formation of twin cyclones, with the other being Super Cyclonic Storm Amphan in the Bay of Bengal.[1] On 19 May, the BOM noted that a low-pressure system centred with a low-pressure trough in the far northwestern part of the basin had developed into an off-season tropical low.[2][3] Situated approximately 790 km (490 mi) southwest of Padang in Sumatra, the system was located within the area of responsibility of TCWC Jakarta.[3] Environmental conditions were assessed as favourable for tropical cyclogenesis by Météo-France and the JTWC, with warm sea surface temperatures, low vertical wind shear, sufficient moisture in the mid troposphere, and a good poleward outflow channel.[4][5] Citing these conditions, the JTWC issued a Tropical Cyclone Formation Alert for the system early on 20 May.[6]
As the tropical low tracked slowly towards the southwest, the previously fragmented deep convection began to consolidate over the centre of the broad low-level circulation.[6][7] Owing to the development of gale-force westerly winds to the north of the system by the afternoon of 20 May, the JTWC upgraded the system to a tropical storm at 03:00 UTC the following day.[7] The tropical low soon adopted a track towards the south-southeast under the influence of a high-pressure ridge to the northeast.[8] Despite being located within an otherwise favourable environment for development, the system's low level circulation remained broad and weakly defined as moderate easterly vertical wind shear hampered the development of persistent deep convection near the centre.[8] Supported by strong upper-level outflow, a burst of deep convection began to bloom near the centre of the struggling tropical low at around 12:00 UTC,[9] at which point TCWC Jakarta upgraded the system to a Category 1 tropical cyclone on the Australian scale, assigning the name Mangga.[10] During May 22, NASA's Aqua satellite recorded cloud top temperatures of -70°F (-56.6°C) on approach to the Cocos Islands.[11] At 21:00 UTC the next day, Mangga transitioned into an extratropical cyclone as warning agencies ceased advisories. Around this time, moisture from the cyclone began to feed a trough and cold front, which all affected Western Australia simultaneously, being called a "once in a century" storm. The system's circulation became difficult to identify during the next several hours, before moving onshore along the coast of Western Australia on May 25. The remnants of Mangga continued to degrade and re-emerged into the Indian Ocean.[12][13]
Impact edit
Ahead of Mangga in Western Australia, a severe weather warning was put in place from Onslow to Esperance. The Department of Fire and Emergency Services (DFES) announces that they would not send volunteers to rescue those choosing to participate in water activists despite the storm, and that residents should prepare with the time they had. Western Power prepared for electrical outages and assembled standby specialist crews incase of needed damage assessments.[14] Damage Estimate[15] Cucumber prices[16]
See also edit
References edit
- ^ "Weekly Tropical Climate Note". Australian Bureau of Meteorology. 19 May 2020. Archived from the original on 19 May 2020. Retrieved 20 May 2020.
- ^ "South-East Asia MSLP Analysis Chart (00Z)". Australian Bureau of Meteorology. 19 May 2020. Archived from the original on 19 May 2020. Retrieved 20 May 2020.
- ^ a b "Western Region Tropical Cyclone Outlook". Australian Bureau of Meteorology. 19 May 2020. Archived from the original on 19 May 2020. Retrieved 19 May 2020.
- ^ "Tropical Cyclone Activity Bulletin for the South-West Indian Ocean" (PDF). Météo-France La Réunion (in French). 19 May 2020. Retrieved 20 May 2020.
- ^ "Significant Tropical Weather Advisory for the Indian Ocean (18Z)". Joint Typhoon Warning Center. Naval Meteorology and Oceanography Command. 19 May 2020. Archived from the original on 20 May 2020. Retrieved 20 May 2020.
- ^ a b "Tropical Cyclone 27S (Mangga) Formation Alert (03Z)". Joint Typhoon Warning Center. Naval Meteorology and Oceanography Command. 20 May 2020. Archived from the original on 20 May 2020. Retrieved 20 May 2020.
- ^ a b "Tropical Cyclone 27S (Mangga) Warning #1A (Corrected) (03Z)". Joint Typhoon Warning Center. Naval Meteorology and Oceanography Command. 21 May 2020. Archived from the original on 21 May 2020. Retrieved 21 May 2020.
- ^ "Tropical Cyclone Mangga Technical Bulletin #3 (18Z)". Australian Bureau of Meteorology. 21 May 2020. Archived from the original on 21 May 2020. Retrieved 21 May 2020.
- ^ "Tropical Cyclone Mangga Track and Impact Map #3 (12Z)". Indonesian Agency for Meteorology, Climatology and Geophysics. 21 May 2020. Archived from the original on 21 May 2020. Retrieved 21 May 2020.
- ^ Rob Gutro (May 22, 2020). "NASA examines tropical storm Mangga in infrared light". Phys.org. Retrieved June 27, 2021.
- ^ Lynn Jenner (May 26, 2020). "Mangga (was 27S) – Southern Indian Ocean". NASA Hurricane and Typhoon Updates. Retrieved June 27, 2021.
- ^ Alex Turner-Cohen (May 25, 2020). "Ex-tropical cyclone Mangga to ravage Western Australia's coast with heavy wind, rain and waves". news.com.au. Retrieved June 27, 2021.
- ^ Evelyn Manfield, Gian de Poloni, Jessica Hayes (May 23, 2020). "Ex-Tropical Cyclone Mangga set to bring 'once-in-a-decade' storm to Western Australia". ABC News Australia. Retrieved June 27, 2021.
{{cite web}}: CS1 maint: multiple names: authors list (link) - ^ "Global Catastrophe Recap May 2020" (PDF).
- ^ "Cucumber prices to rise as dust storm from ex-Tropical Cyclone Mangga wipes out WA crops".
