2017–18 South-West Indian Ocean cyclone season: Difference between revisions

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	\| Last storm dissipated=Season Ongoing		\| Last storm dissipated=Season Ongoing
	\| Strongest storm name=Ava		\| Strongest storm name=Ava
	\| Strongest storm pressure=~~983~~		\| Strongest storm pressure=978
	\| Strongest storm winds=55		\| Strongest storm winds=60
	\| Average wind speed=10		\| Average wind speed=10
	\| Total disturbances=1 official, 1 unofficial		\| Total disturbances=1 official, 1 unofficial
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	\|Formed=December 29		\|Formed=December 29
	\|Dissipated=Present		\|Dissipated=Present
	\|10-min winds=55		\|10-min winds=60
	\|1-min winds=55		\|1-min winds=60
	\|Pressure=~~983~~		\|Pressure=978
	\|Type=		\|Type=
	}}-->		}}-->
	{{Infobox hurricane current		{{Infobox hurricane current
	\|name=Ava		\|name=Ava
	\|MFRcategory=~~STS~~		\|MFRcategory=swiosts
	\|MFRtype=STS		\|MFRtype=STS
	\|category=storm		\|category=storm
	\|type=tropical storm		\|type=tropical storm
	\|lat=17.4\|S\|lon=51.5\|E		\|lat=17.1\|S\|lon=50.9\|E
	\|distance_from={{convert\|~~560~~\|km\|abbr=on}} NW of ]		\|distance_from={{convert\|630\|km\|abbr=on}} NW of ]
	\|track=JTWC sh0318.gif		\|track=JTWC sh0318.gif
	\|track_caption=Forecast track map		\|track_caption=Forecast track map
	\|image=01R 2018-01-02 1020Z.jpg		\|image=01R 2018-01-02 1020Z.jpg
	\|time=16:00 RET (12:00 ]),<br/> January 4		\|time=22:00 RET (18:00 ]),<br/> January 4
	\|10sustained=~~100~~ ] (65 ])		\|10sustained=110 ] (70 ])
	\|1sustained=~~100~~ ] (65 ])		\|1sustained=110 ] (70 ])
	\|gusts=~~140~~ km/h (85 mph)		\|gusts=155 km/h (100 mph)
	\|movement=W at {{convert\|5\|kn\|abbr=on}}		\|movement=W at {{convert\|6\|kn\|abbr=on}}
	\|pressure=~~983~~ ] (]; 29.03 ])		\|pressure=978 ] (]; 28.88 ])
	}}		}}

	==== Current storm information ====		==== Current storm information ====
	As of 16:00 RET (12:00 ]) January 4, Severe Tropical Storm Ava is located near {{coord\|-17.4\|51.5\|dim:100km\|name=Ava}}, about {{convert\|~~560~~\|km\|abbr=off}} northwest of La Réunion. 10-minute sustained winds are at ~~100~~ km/h (65 mph), while 1-minute sustained winds are at ~~100~~ km/h (65 mph), with gusts of up to ~~140~~ km/h (85 mph). The minimum barometric pressure is at {{Convert\|~~983~~\|hPa\|inHg\|2}}, and the system is moving westwards at {{convert\|5\|kn}}.		As of 22:00 RET (18:00 ]) January 4, Severe Tropical Storm Ava is located near {{coord\|-17.1\|50.9\|dim:100km\|name=Ava}}, about {{convert\|630\|km\|abbr=off}} northwest of La Réunion. 10-minute sustained winds are at 110 km/h (70 mph), while 1-minute sustained winds are at 110 km/h (70 mph), with gusts of up to 155 km/h (100 mph). The minimum barometric pressure is at {{Convert\|978\|hPa\|inHg\|2}}, and the system is moving westwards at {{convert\|6\|kn}}.

	For latest official information, see:		For latest official information, see:
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	{{Pacific areas affected (Top)}}		{{Pacific areas affected (Top)}}
	\|-		\|-
	\| {{Sort\|01\|Ava}} \|\| {{Sort\|171229\|December 29 – Present}} \|\| bgcolor=#{{storm colour\|STS}}\|{{Sort\|4\|Severe tropical storm}} \|\| bgcolor=#{{storm colour\|STS}}\|{{Sort\|~~100~~\|~~100~~ km/h (65 mph)}} \|\| bgcolor=#{{storm colour\|STS}}\|{{Sort\|~~0983~~\|~~983~~ hPa (29.03 inHg)}} \|\| Madagascar \|\| None \|\| None \|\|		\| {{Sort\|01\|Ava}} \|\| {{Sort\|171229\|December 29 – Present}} \|\| bgcolor=#{{storm colour\|STS}}\|{{Sort\|4\|Severe tropical storm}} \|\| bgcolor=#{{storm colour\|STS}}\|{{Sort\|110\|110 km/h (70 mph)}} \|\| bgcolor=#{{storm colour\|STS}}\|{{Sort\|0978\|978 hPa (28.88 inHg)}} \|\| Madagascar \|\| None \|\| None \|\|
	\|-		\|-
	{{TC Areas affected (Bottom)\|TC's=1 system\|dates=December 29 – Present\|winds=~~100~~ km/h (65 mph)\|pres=~~983~~ hPa (29.03 inHg)\|damage=None\|deaths=None\|Refs=}}		{{TC Areas affected (Bottom)\|TC's=1 system\|dates=December 29 – Present\|winds=110 km/h (70 mph)\|pres=978 hPa (28.88 inHg)\|damage=None\|deaths=None\|Refs=}}

	==See also==		==See also==

Revision as of 19:52, 4 January 2018

2017–18 South-West Indian Ocean cyclone season
Season summary map
Seasonal boundaries
First system formed	December 29, 2017
Last system dissipated	Season Ongoing
Strongest storm

Name	Ava
• Maximum winds	110 km/h (70 mph) (10-minute sustained)
• Lowest pressure	978 hPa (mbar)

Seasonal statistics
Total disturbances	1 official, 1 unofficial
Total depressions	1
Total storms	1
Tropical cyclones	0
Intense tropical cyclones	0
Total fatalities	0
Total damage	None
Related articles
2017–18 Australian region cyclone season 2017–18 South Pacific cyclone season
South-West Indian Ocean tropical cyclone seasons 2015–16, 2016–17, 2017–18, 2018–19, 2019–20

The 2017–18 South-West Indian Ocean cyclone season is a current event in the annual cycle of tropical cyclone and subtropical cyclone formation. It officially began on November 15, 2017, and will end officially on April 30, 2018, with the exception for Mauritius and the Seychelles, for which it will end on May 15, 2018. These dates conventionally delimit the period of each year when most tropical and subtropical cyclones form in the basin, which is west of 90°E and south of the Equator. Tropical and subtropical cyclones in this basin are monitored by the Regional Specialised Meteorological Centre in Réunion.

Seasonal summary

Systems

Severe Tropical Storm Ava

Ava

Current storm status
Severe tropical storm (MFR)

Current storm status
Tropical storm (1-min mean)

Satellite image

Forecast track map

As of:

22:00 RET (18:00 UTC),
January 4

Location:

17°06′N 50°54′E / 17.1°N 50.9°E / 17.1; 50.9 (Ava)
630 km (390 mi) NW of La Réunion

Sustained winds:

110 km/h (70 mph) (10-min mean)
110 km/h (70 mph) (1-min mean)
gusting to 155 km/h (100 mph)

Pressure:

978 hPa (mbar; 28.88 inHg)

Movement:

W at 6 kn (11 km/h; 6.9 mph)

See more detailed information.

Current storm information

As of 22:00 RET (18:00 UTC) January 4, Severe Tropical Storm Ava is located near 17°06′S 50°54′E / 17.1°S 50.9°E / -17.1; 50.9 (Ava), about 630 kilometres (390 miles) northwest of La Réunion. 10-minute sustained winds are at 110 km/h (70 mph), while 1-minute sustained winds are at 110 km/h (70 mph), with gusts of up to 155 km/h (100 mph). The minimum barometric pressure is at 978 hectopascals (28.88 inHg), and the system is moving westwards at 6 knots (11 km/h; 6.9 mph).

For latest official information, see:

The MFR's RSMC bulletin on Severe Tropical Storm Ava
The JTWC's TC warning text on Tropical Cyclone 03S (Ava)

Other systems

A low-pressure system, classified as a tropical low by the Australian Bureau of Meteorology, moved west-southwest across the 90th meridian east into the Southwest Indian Ocean basin on August 8. At 10:00 UTC the following day, Météo-France Réunion upgraded the low-pressure system to a zone of disturbed weather, with sustained winds of up to 55 km/h (35 mph) being detected on the southern side of the circulation by scatterometer. At this time, the disturbance was located approximately 2,375 km (1,475 mi) west of Jakarta, Indonesia. Météo-France noted that the revival of convective activity in the basin was likely due to the interaction between an eastwards-moving Kelvin wave and a westwards-moving Rossby wave.

Storm names

Within the South-West Indian Ocean, tropical depressions and subtropical depressions that are judged to have 10-minute sustained wind speeds of 65 km/h (40 mph) by the Regional Specialized Meteorological Center on La Réunion Island, France (RSMC La Réunion) are usually assigned a name. However, it is the Sub-Regional Tropical Cyclone Advisory Centers in Mauritius and Madagascar who name the systems. The Sub-Regional Tropical Cyclone Advisory Center in Mauritius names a storm should it intensify into a moderate tropical storm between 55°E and 90°E. If instead a cyclone intensifies into a moderate tropical storm between 30°E and 55°E then the Sub-Regional Tropical Cyclone Advisory Center in Madagascar assigns the appropriate name to the storm. Beginning from the 2016–17 season, name lists within the South-West Indian Ocean will be rotated on a triennial basis. Storm names are only used once, so any storm name used this year will be removed from rotation and replaced with a new name for the 2020–21 season. The unused names are expected to be reused in the list for the 2020–21 season.

Ava (active)
Berguitta (unused)
Cebile (unused)
Dumazile (unused)
Eliakim (unused)
Fakir (unused)
Guambe (unused)
Habana (unused)
Iman (unused)

Jobo (unused)
Kanga (unused)
Ludzi (unused)
Melina (unused)
Nathan (unused)
Onias (unused)
Pelagie (unused)
Quamar (unused)
Rita (unused)

Solani (unused)
Tarik (unused)
Urilia (unused)
Vuyane (unused)
Wagner (unused)
Xusa (unused)
Yarona (unused)
Zacarias (unused)

Seasonal effects

This table lists all of the tropical cyclones and subtropical cyclones that were monitored during the 2017–2018 South-West Indian Ocean cyclone season. Information on their intensity, duration, name, areas affected, primarily comes from RSMC La Réunion. Death and damage reports come from either press reports or the relevant national disaster management agency while the damage totals are given in 2017 or 2018 USD.

Name	Dates	Peak intensity			Areas affected	Damage (USD)	Deaths	Refs
Name	Dates	Category	Wind speed	Pressure	Areas affected	Damage (USD)	Deaths	Refs
Ava	December 29 – Present	Severe tropical storm	110 km/h (70 mph)	978 hPa (28.88 inHg)	Madagascar	None	None
Season aggregates
1 system	December 29 – Present		110 km/h (70 mph)	978 hPa (28.88 inHg)		None	None

References

"WebCite query result". www.webcitation.org. Retrieved 2017-08-08. {{cite web}}: Cite uses generic title (help)
"WebCite query result". www.webcitation.org. Retrieved 2017-08-09. {{cite web}}: Cite uses generic title (help)
^ "ZCIT Bulletin for August 9 2017" (PDF). {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
Regional Association I Tropical Cyclone Committee (2016). "Tropical Cyclone Operational Plan for the South-West Indian Ocean" (PDF). World Meteorological Organization. Retrieved 2016-10-05.