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=== Zone Of Disturbed Weather 07 ===
{{Infobox tropical cyclone small
|Basin=SWI
|Image=
|Track=
|Formed=January 22
|Dissipated=Present
|10-min winds=20
|Pressure=1002
|Type1=ZODW
}}
== Storm names ==
== 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 [[Réunion|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 [[55th meridian east|55°E]] and [[90th meridian east|90°E]]. If instead, a cyclone intensifies into a moderate tropical storm between [[30th meridian east|30°E]] and [[55th meridian east|55°E]] then the Sub-Regional Tropical Cyclone Advisory Center in Madagascar assigns the appropriate name to the storm.
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 [[Réunion|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 [[55th meridian east|55°E]] and [[90th meridian east|90°E]]. If instead, a cyclone intensifies into a moderate tropical storm between [[30th meridian east|30°E]] and [[55th meridian east|55°E]] then the Sub-Regional Tropical Cyclone Advisory Center in Madagascar assigns the appropriate name to the storm.

Revision as of 02:19, 23 January 2020

2019–20 South-West Indian Ocean cyclone season
Season summary map
Seasonal boundaries
First system formedJuly 22, 2019
Last system dissipatedSeason ongoing
Strongest storm
NameAmbali
 • Maximum winds220 km/h (140 mph)
(10-minute sustained)
 • Lowest pressure930 hPa (mbar)
Seasonal statistics
Total disturbances6
Total depressions4
Total storms3
Tropical cyclones3
Intense tropical cyclones1
Very intense tropical cyclones1
Total fatalities9
Total damageUnknown
Related articles
South-West Indian Ocean tropical cyclone seasons
2017–18, 2018–19, 2019–20, 2020–21, 2021–22

The 2019–20 South-West Indian Ocean cyclone season is a current event of the annual cycle of tropical cyclone and subtropical cyclone formation. The season officially began on November 15, however, the formation of the first system—Zone of Disturbed Weather 01—occurred on July 22, 2019, well before the official start of the season. It will end on April 30, 2020, with the exception of Mauritius and the Seychelles, for which it will end on May 15, 2020. 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.

For the second consecutive year in a row, the first system formed before the official start of the season. Afterwards, two storms formed in the month of December: Cyclone Belna on December 2, which brought flooding and strong wind to northwestern Madagascar, and also Very Intense Tropical Cyclone Ambali a day later. Ambali was the first very intense tropical cyclone in the basin since Fantala in 2016.

Seasonal forecasts

The season began with one of the strongest positive phases of the Indian Ocean Dipole (IOD) in the past 40 years. Météo-France Réunion expects that the positive anomalies will decay slowly throughout austral summer, having a prominent impact on the cyclone season through mid-February. As a result, storm activity was not forecast to begin until December—the month in which the monsoonal flow becomes established in the western half of the basin (the dry conditions in the central and eastern Indian Ocean induced by the IOD would prevent typical early-season storms). With warm and wet conditions expected in the western Indian Ocean, cyclone formation is expected to be enhanced west of 70°E.[1]

A near-average eight to eleven storms are expected throughout the course of the season, with the possibility of a higher than average number of these attaining Tropical Cyclone strength with winds of 120 km/h (75 mph) or greater as a result of favorable upper-level divergence in the western region of the basin. Activity is expected to be focused west of the Chagos Archipelago, presenting an increased threat to land. A wide range of track types and motions are expected, although predominantly southerly storm motion will be favored.[1]

In November, the Mauritius Meteorological Services forecasted eight to ten named storms and emphasized that storm formation would be more likely west of Diego Garcia.[2]

Seasonal summary

Tropical cyclone scales#Comparisons across basins

On July 22, Zone of Disturbed Weather 01 formed and started the cyclone season. The disturbance failed to organize into a tropical depression and dissipated on July 25. Tropical activity came to a halt until December 2, when Tropical Disturbance 02 formed. A day later, Tropical Depression 03 formed and was later named Ambali. On December 5, Tropical Storm Ambali rapidly intensified, becoming the first very intense tropical cyclone since Fantala in 2016. Tropical Disturbance 02 then became Belna, and Belna continued to intensify into a Severe Tropical Storm. Belna then intensified into a cyclone, equivalent to a category 3 hurricane before making landfall in northwestern Madagascar as a category 2 hurricane-equivalent storm, leaving significant damages and 9 deaths. In late December, tropical storm Calvinia formed.

Systems

Zone of Disturbed Weather 01

Zone of disturbed weather
 
DurationJuly 22 – July 25
Peak intensity45 km/h (30 mph) (10-min);
1001 hPa (mbar)

In mid-July, a broad wind circulation developed over the central Indian Ocean, accompanied by deep convection. Some computer models suggested the possibility of a southern segment of this system organizing into a tropical cyclone; Météo-France (MFR) initially estimated a "very low" chance of a moderate tropical storm materializing from the large circulation near Diego Garcia.[3] Due to strong wind shear, the environment remained unfavorable for tropical development.[4] On July 22, Météo-France began monitoring the system as a zone of disturbed weather; the system's forward motion was initially southward.[5] A temporary decrease in wind shear on 23 July provided a brief period conducive for tropical development,[6] and the system strengthened to its peak winds of 45 km/h (30 mph) that day.[5] However, the disturbance's center of circulation remained ill-defined and lacking showers and thunderstorms.[7] Although the disturbance was forecast to initially strengthen into a tropical storm,[7] an increase in wind shear prevented the storm from consolidating further about the center of circulation and caused the overall wind field to disorganize.[8][9] The system curved towards the west on July 24 and eventually degenerated into a remnant circulation northeast of Rodrigues by the 25 July;[5] these remnants persisted for another day before dissipating entirely.[10][11]

Tropical Cyclone Belna

Main article: Cyclone Belna
Tropical cyclone (MFR)
Category 3 tropical cyclone (SSHWS)
 
DurationDecember 2 – December 11
Peak intensity155 km/h (100 mph) (10-min);
955 hPa (mbar)

MFR began highlighting the potential for tropical cyclone development in their daily bulletins on 25 November, noting an increase in shower activity west of the Seychelles.[12] Aided by the passage of a Kelvin wave and a favorable window in the Madden–Julian oscillation, a broad trough of low pressure began to take shape within the storm activity, extending across the equator.[13][14] Projections from computer models remained in disagreement over the system's future, complicated by the concurrent development of a tropical disturbance in the northwestern Indian Ocean along the same trough.[14] A loosely-defined wind circulation was detected 263 km (163 mi) south of Mahe, Seychelles on 29 November, offset from convection.[15] Over the following days, this circulation tightened within an environment moderately conducive for tropical development.[16][17] Météo-France declared the system as a zone of disturbed weather on 2 December; at the time the system had drifted west from its point of origin.[18] Although the storm was better organized and the environment conducive for intensification, the storm's wind field initially remained elongated and rainfall remained north of the storm's center.[19][20][21] The disturbance become a tropical depression on 5 December, attended by an increase in rainbands and the return of convection at the center of circulation;[22][23] at 18:00 UTC that day, the system was upgraded to Moderate Tropical Storm Belna.[18]

Belna was upgraded to severe tropical storm status early on 6 December.[18] Around the same time, a cloud-obscured eye briefly became apparent in microwave satellite imagery. Due to a strengthening area of high pressure to its east, Belna began to curve from its initial westward drift to a more directed southwestward trajectory.[24] After a brief period of strengthening,[18] Belna's central dense overcast remained largely unchanged throughout 6 December before signs of resumed intensification emerged by the day's end, followed by the development of another eye.[25][26][27] With the storm's eye becoming better defined, MFR upgraded Belna to a tropical cyclone early on 7 December. Hot towers were detected atop and within the storm's radius of maximum winds, suggesting the onset of a more accelerated rate of intensification.[28] On 9 December, Belna made landfall near Mayotte and soon began to rapidly weaken, with the winds dropping below tropical-storm-force on the next day. The system dissipated late on 11 December over Haute Matsiatra.[18]

Météo Madagascar first issued green alerts for the Madagascan districts of Diana, Sava, and Sofia on 4 December based on a high probability of Belna impacting northeastern Madagascar. Accordingly, cyclone response measures were activated by the National Office for Risk and Disaster Management and humanitarian organizations across northern Madagascar.[29] Green alerts were later extended to encompass five districts.[30] A cyclone pre-alert was issued for Mayotte on 6 December,[31] succeeded by an orange alert the following day.[32] Civil security personnel from mainland France and Reunion, some from the National Gendarmerie, were sent to Mayotte to aid storm preparation efforts there.[33][34] Shelters were opened in several Mayotte communes on 7 December.[35]

Very Intense Tropical Cyclone Ambali

Very intense tropical cyclone (MFR)
Category 4 tropical cyclone (SSHWS)
 
DurationDecember 3 – December 8
Peak intensity220 km/h (140 mph) (10-min);
930 hPa (mbar)

While Belna was gradually developing out of an extended trough of low pressure, another area of convection formed along the same trough between the Seychelles and the Chagos Archipelago in early December.[36] The system organized quickly, attaining formative rainbands around a coalescing center of circulation on 3 December.[37] At 06:00 UTC, the system was classified as a Zone of Disturbed Weather. A day later, the system was upgraded to a tropical depression following a significant increase in convection near its center.[38][39] Steered by a high-pressure area centered over the southern Indian Ocean, the tropical depression moved south.[40] The quick organization continued into 5 December, and MFR named the system Moderate Tropical Storm Ambali as a central dense overcast emerged;[41] Ambali intensified into a Severe Tropical Storm a few hours later.[38] Buoyed by a highly favorable environment with waters between 29–30 °C (84–86 °F), explosive intensification ensued, accompanied by the formation of an eye.[42][43] At 18:00 UTC on 5 December, MFR upgraded Ambali to intense tropical cyclone status following a sharp 75 km/h (45 mph) increase in the storm's winds in 3 hours.[38] The cyclone was highly compact, with a distinct eye 15 km (9 mi) in diameter surrounded by cold cloud tops.[44][45]

Six hours later, Ambali was reclassified as a very intense tropical cyclone,[38] the highest rating on the MFR's intensity scale and the first in the basin since Fantala in 2016.[46][47] The agency estimated maximum 10-minute sustained winds of 220 km/h (140 mph) and a minimum pressure of 930 mbar (hPa; 27.46 inHg);[38] concurrently, the Joint Typhoon Warning Center (JTWC) assessed peak 1-minute sustained winds of 250 km/h (155 mph), making Ambali a high-end category 4-equivalent on the Saffir–Simpson scale. The cyclone's eye had contracted further to a diameter of 9 km (5 mi) early on 6 December at the time of peak intensity.[48] Based on JTWC data, Ambali's winds increased by 185 km/h (115 mph) in 24 hours, marking the fastest 24-hour intensification recorded in the Southern Hemisphere since 1980 and topping the old record set by Cyclone Ernie in 2017.[49][50] A gradual weakening trend soon succeeded the rapid intensification episode as indicated by a clouding-over of the small eye.[48] Within a few hours of Ambali's peak strength, the eye was no longer apparent on infrared satellite imagery; dry air became wrapped close to the core of the cyclone's compact circulation.[51] Impaired further by an increase in wind shear,[52][53] Ambali's strength quickly diminished throughout 6 December, and by the following day, its winds fell below tropical cyclone thresholds.[38] Despite otherwise inhibiting environmental factors, the eye reappeared for a two-hour period before fully succumbing to the dry air and 55 km/h (35 mph) wind shear.[54] Rapid weakening soon proceeded, and by mid-day on 7 December, the storm's coldest cloud tops were displaced east of the center of circulation; Ambali's motion also became erratic as winds in the lower levels of the troposphere began to govern its track.[55] On 8 December, Ambali degenerated to a remnant low and MFR issued their last advisory on the dissipating system.[56]

Tropical Cyclone Calvinia

Tropical cyclone (MFR)
Category 1 tropical cyclone (SSHWS)
 
DurationDecember 27 – January 1
Peak intensity120 km/h (75 mph) (10-min);
973 hPa (mbar)

The origin of Calvinia can be traced back to an area of persistent showers and thunderstorms southwest of Diego Garcia first noted by the JTWC on 16 December. The system featured a loosely-defined circulation upon designation, but computer models indicated that tropical cyclogenesis intermediately was unlikely.[57] The storm complex drifted southward over the next two days,[58] and an increase in organisation briefly prompted the issuance of a Tropical Cyclone Formation Alert (TCFA) on 18 December before an increase in wind shear cut development of the system short, leading to alert's cancellation despite the system producing storm-force winds.[59][60] The system then slowly curved to the west towards Madagascar,[61][62] eventually moving into a much more favorable environment enhanced by a passing Kelvin wave by 25 December.[63][64] Two days later, MFR designated the system as a Zone of Disturbed Weather;[65] the disturbance was initially broad and had two areas of rotation.[66] The next day, MFR upgraded the system to a Tropical Depression while the JTWC issued a second TCFA.[65][67] Tracking southward, the depression strengthened and became a Moderate Tropical Storm on 29 December, gaining the name Calvinia.[68][69]

Dry air and wind shear afflicted the nascent storm early in its development, limiting convection the southern half of Calvinia's circulation.[69][70] The storm remained asymmetric but showed signs of improvement on 29 December as the environment became more favourable for intensification, with rainbands redeveloping near the center of the storm. Concurrently, Calvinia turned towards the southwest and slowed down as it neared Mauritius.[71] The next morning, a small eye emerged within the quasi-stationary Calvinia on radar imagery from the Mascarene Islands; allowing the MFR to upgrade Calvinia to a Severe Tropical Storm that day.[72] The eye was later evident on satellite imagery, indicative of continued intensification.[73] After the eye had collapsed yet again, an area of high pressure to Calvinia's southeast then began to steer the storm slowly towards the south and away from the Mascarene Islands on 30 December.[74] Shortly after it began to track away from Mauritius, the storm intensified further into a Category 1 hurricane-equivalent storm and another eye began to appear on satellite imagery on December 31. Shortly after, the MFR also upgraded Calvinia to a tropical cyclone.[75] Not too long after intensifying, the storm accelerated southwestwards and significantly weakened on January 1. As a result, the MFR issued their final advisory on the system as it turned extratropical.[76]

All the three major Mascarene Islands were placed under a pre-cyclonic alert on 29 December.[77] Mauritius Meteorological Services issued a class III warning for Mauritius on 29 December, indicating the forecast onset of 120 km/h (75 mph) wind gusts.[78][79] Several key services in Mauritius were closed ahead of Calvinia's approach, including Sir Seewoosagur Ramgoolam International Airport and the Port Louis Harbor amid the country's peak tourism season, effectively suspending external trade with Mauritius.[78][80] The Stock Exchange of Mauritius suspended operations, and most other shops and businesses in Port Louis also closed.[80] Air Mauritius postponed all of its flights indefinitely.[78] Evacuation shelters on Mauritius housed 298 refugees during the storm,[81] with a total of 168 shelters opened.[82] The center of Calvinia was 60 km (37 mi) from Mauritius at its closest approach on 31 December.[83] Stormy conditions prevailed on the island, causing flooding in some areas.[77] Power outages affected 6,000 families in Union Vale and Ferney.[82] Rains from Calvinia caused flooding in southern Réunion, blocking roads in Saint Louis and L'Étang-Salé.[84] The storm also caused minor damage on the island, knocking down trees and power lines. Water utility company Sudéau reported several incidents to its water distribution systems during the storm. A 325 mm (12.8 in)-rainfall total was recorded in Dimitile, while a peak wind gust of 122 km/h (76 mph) was measured in Plaine des Cafres.[83]

Tropical Depression 05

Tropical depression (MFR)
Tropical storm (SSHWS)
 
DurationJanuary 19 – Present
Peak intensity55 km/h (35 mph) (10-min);
999 hPa (mbar)

In mid-January 2020, a monsoon trough began to produce persistent convection over the southwestern Indian Ocean near the Chagos Archipelago.[85][86] An elongated wind circulation slowly developed within this aggregation of storms moving towards the southeast.[87][88] MFR classified the system as a Zone of Disturbed Weather on 19 January and initiated advisories two days later.[89] Due to strong wind shear and low-level convergence, conditions were unfavorable for substantial intensification.[90]

Zone of Disturbed Weather 06

Zone of disturbed weather
 
DurationJanuary 22 – Present
Peak intensity55 km/h (35 mph) (10-min);
999 hPa (mbar)

Zone Of Disturbed Weather 07

Zone of disturbed weather
 
DurationJanuary 22 – Present
Peak intensity35 km/h (25 mph) (10-min);
1002 hPa (mbar)

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 2022–23 season. The unused names are expected to be reused in the list for the 2022–23 season.[91] All of the names are the same with the exception of Ambali, Belna, Calvinia, Diane, Esami and Francisco, which replaced Abela, Bransby, Carlos, Dineo, Enawo and Fernando from the 2016–17 season.

  • Ambali
  • Belna
  • Calvinia
  • Diane (unused)
  • Esami (unused)
  • Francisco (unused)
  • Gabekile (unused)
  • Herold (unused)
  • Irondro (unused)
  • Jeruto (unused)
  • Kundai (unused)
  • Lisebo (unused)
  • Michel (unused)
  • Nousra (unused)
  • Olivier (unused)
  • Pokera (unused)
  • Quincy (unused)
  • Rebaone (unused)
  • Salama (unused)
  • Tristan (unused)
  • Ursula (unused)
  • Violet (unused)
  • Wilson (unused)
  • Xila (unused)
  • Yekela (unused)
  • Zania (unused)

Seasonal effects

This table lists all of the tropical cyclones and subtropical cyclones that were monitored during the 2019–20 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 2019 USD.

Name Dates Peak intensity Areas affected Damage
(USD) 		Deaths Refs
Category Wind speed Pressure
01 July 22 – 25 Zone of disturbed weather 45 km/h (30 mph) 1001 hPa (29.56 inHg) None None None
Belna December 2 – 11 Tropical cyclone 155 km/h (100 mph) 955 hPa (28.35 inHg) Seychelles, Mayotte, Comoros, Madagascar Unknown 9
Ambali December 3 – 8 Very intense tropical cyclone 220 km/h (140 mph) 930 hPa (27.46 inHg) None None None
Calvinia December 27 – January 1 Tropical cyclone 120 km/h (75 mph) 973 hPa (28.99 inHg) Mauritius, Rodrigues Unknown None
05 January 19 – Present Tropical disturbance 45 km/h (30 mph) 1002 hPa (29.59 inHg) None None None
06 January 22 – Present Zone of disturbed weather 55 km/h (35 mph) 999 hPa (29.50 inHg) Madagascar None None
Season aggregates
6 systems July 22 –
Season ongoing		 220 km/h (140 mph) 930 hPa (27.46 inHg) None 9

See also

References

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External links

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