1996–97 South-West Indian Ocean cyclone season

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disorganized area of convection, which quickly weakened due to an increase in wind shear. Early on February 17, Karlette weakened to tropical depression status, although later that day re-attained tropical storm status after the shear diminished. The storm had been moving generally to the west-southwest due to a large ridge to the southeast. The storm's restrengthening was short-lived, as Karlette again weakened to tropical depression status on February 20, only to re-intensify into a tropical storm for the third time just six hours later. With the convection reorganizing, the storm developed an eye feature, indicative of the restrengthening. Late on February 21, Karlette passed about 70 km (45 mi) south of Rodrigues, where wind gusts remained below 110 km/h (68 mph); also on the island, the storm dropped beneficial rainfall totaling around 100 mm (3.9 in). Subsequently, Karlette attained peak 10–minute winds of 110 km/h (70 mph) on February 22, while the JTWC estimated 1–minute winds of 120 km/h (75 km/h). Passing well to the southeast of Mauritius, the storm curved more to the south due to an approaching trough, dissipating on February 25.

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temperatures. On August 13, an area of convection persisted east of the Chagos, in association with the near-equatorial trough, later developing a low-pressure area and well-defined circulation. On August 16, the system organized into a tropical disturbance, becoming Tropical Depression A1 the next day; this made it the first such storm in the month of August since Tropical Depression Aline in August 1969. Also on August 17, the JTWC initiated advisories on Tropical Cyclone 2S. The depression moved southward, developing a well-defined central dense overcast, despite the presence of northerly wind shear. On August 18, an anticyclone turned the depression eastward; that day, the JTWC estimated peak 1–minute winds of 85 km/h (55 mph), and the MFR estimated a peak 10–minute intensity of 55 km/h (35 mph). The depression later began to weaken under the influence of an approaching trough, and was dissipating as it crossed into the Australian region on August 19. The JTWC tracked the circulation for another two days, estimating that the system turned sharply to the west, and the circulation dissipated on August 23.

1235:, which initially was still located within the ITCZ. On February 5, the system developed into a tropical depression, and failed to intensify further while executing a clockwise loop off northeastern Madagascar. After the convection increased, the depression intensified into a tropical storm on February 8 and was named Josie by the Meteorological Services of Madagascar. Subsequently, the storm moved across northern Madagascar and emerged into the Mozambique Channel on February 9 as a tropical depression, its structure deteriorated. Josie turned to the southwest around western Madagascar, and despite warm waters it initially failed to re-intensify much. On February 11, Josie re-attained tropical storm status, and subsequently turned to the south due to a broad area of low pressure in the region. The storm quickly intensified once moving far enough away from Madagascar, becoming a tropical cyclone on February 13 and soon after reaching peak 10–winds of 140 km/h (85 mph); in contrast, the JTWC estimated peak 1–minute winds of 165 km/h (105 mph). While near peak intensity, the eyewall of Josie passed over 1522:

developed after Lisette originated in late February. The final disturbance of the season originated from a persistent area of convection near the equator on July 19, northeast of Diego Garcia. With warm enough water temperatures, the system developed further, becoming Tropical Depression M2 on July 20, the first July depression since 1971. That day, the JTWC classified the storm as Tropical Cyclone 01S. As the JTWC considers the tropical cyclone year to begin on July 1, and the MFR considered it beginning on August 1 at the time, the storm was in different cyclone years in different agencies. Estimates from the Dvorak technique suggested that the system approached tropical storm status on July 21 after a central dense overcast formed, although the MFR only estimated peak 10–minute winds of 55 km/h (35 mph). Moving southwestward and later to the west, the depression began weakening due to wind shear on July 23, and dissipated two days later. At the time, July was within the annual tropical cyclone year, although a change in policy shifted the end of the tropical cyclone year to June 30, beginning in

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entering the south-west Indian as a tropical depression on November 24. Around that time, the JTWC had begun classifying it as Tropical Cyclone 7S. On November 26, the depression intensified into Tropical Storm Chantelle, and the convection continued to organize despite the presence of wind shear. That day, the JTWC estimated peak 1–minute winds of 120 km/h (75 mph). On November 27, the MFR estimated peak 10–minute winds of 95 km/h (60 mph). An approaching trough imparted significant weakening, and Chantelle weakened to tropical depression status 18 hours after it was at peak intensity. A ridge behind the trough steered the weakening system to the northwest, causing Chantelle to reach the low latitude of 5° S. Widespread cloudiness made it difficult for MFR to continue tracking the circulation, and the agency issued the final advisory on November 30 northwest of Diego Garcia. The JTWC continued tracking the storm for several more days, and the remnants of Chantelle likely contributed to the formation of the subsequent Tropical Cyclone Daniella.

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January 24, the system developed into a tropical depression, by which time the Mauritius Meteorological Services had named it Iletta. The depression quickly intensified into a tropical storm, but further development halted on January 25. Due to a nearby trough, the storm tracked to the southeast. Iletta resumed intensification on January 26, quickly reaching peak 10–winds of 100 km/h (60 mph); the JTWC meanwhile estimated peak 1–minute winds of 140 km/h (85 mph). Subsequently, increased wind shear weakened Iletta, and within 24 hours the storm had decreased from peak intensity to tropical depression status. After the trough passed the storm, Iletta turned to the north under the influence of a ridge to the south, dissipating on January 30 about 305 km (190 mi) east-southeast of where it initially formed.

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had intensified into Tropical Cyclone Pancho, reaching 10–minute winds of 205 km/h (125 mph) before weakening occurred. On January 23, the cyclone entered the south-west Indian Ocean, at which time Pancho was renamed Helinda. Around that time, the storm was located between two ridges, causing the motion to become nearly stationary, and by January 24 Helinda had re-entered the Australian region. Around that time, the storm began undergoing a large loop to the east of 90° E, during which the winds decreased below tropical storm status. The influence of the monsoon trough turned the storm back to the south on January 29, and a day later a building ridge turned the storm back to the west. On January 31, Helinda again crossed into the south-west Indian Ocean as an intensifying tropical storm.

1518:. The system continued to the west, entering the south-west Indian Ocean on January 5. On January 8, the remnants of Phil slowed and turned to the southeast. The next day, the JTWC began reissuing advisories on Phil. The storm meandered and executed a small loop, and in the process reached peak 1–minute winds of 85 km/h (55 mph). Phil turned back to the southwest, and the JTWC ceased issuing advisories on January 12. Four days later, the circulation dissipated. Also in January, the JTWC briefly tracked Tropical Cyclone 18S from the Australian region, which entered the south-west Indian Ocean on January 12. At that time, the storm had peak 1–minute winds of 85 km/h (55 mph), although it quickly weakened and dissipated on January 13. 31: 714:, with JTWC estimated 1–minute winds of 220 km/h (135 mph). Around that time, the cyclone turned to the south due to an approaching trough. The eye, previously well-defined and 40 km (25 mi) in diameter at its peak, gradually became less organized due to decreasing water temperatures. Daniella turned more to the southeast on December 8, bringing it between the islands of Réunion and Mauritius after weakening into a strong tropical storm. A sharp increase in wind shear removed the convection from the circulation on December 9, weakening Daniella to tropical depression status. Two days later, the circulation dissipated. 1399:

two ridges. After an increase in convection, the system intensified into Tropical Storm Lisette on February 28 according to the MFR, although by that time the JTWC had upgraded the storm to the equivalent of tropical cyclone status. A building ridge turned the storm sharply westward. On March 1, the MFR estimated peak 10–minute winds of 95 km/h (60 mph), making Lisette a severe tropical storm with an eye feature in the center. By comparison, the JTWC estimated peak 1–minute winds of 130 km/h (80 mph). The storm failed to intensify further, making landfall at peak intensity just north of

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developed into a central dense overcast, the system intensified into Tropical Storm Elvina on December 10. Later that day, the MFR estimated peak 10–minute winds of 85 km/h (55 mph). On December 11, the JTWC estimated peak 1–minute winds of 100 km/h (60 mph). By that time, Elvina had been moving steadily west-southwestward, although the storm slowed on December 12. A polar trough caused the storm to accelerate to the southwest on December 14 while simultaneously increasing wind shear, causing weakening. On December 16, Elvina dissipated well to the south of Diego Garcia.

1538: 284:– killed 152 people when it struck southeastern Madagascar. Between January and February, Cyclone Pancho-Helinda lasted about 20 days between both the Australian and south-west Indian basins. Also in February, Tropical Storm Josie killed 36 people in western Madagascar after causing severe flooding. The final named storm was Tropical Storm Lisette, which dissipated on March 3 after striking Mozambique, killing three people. Despite the early end to the named storms, there were two additional disturbances, one of which became the first July tropical depression in 25 years. 549:(BoM) named the system Melanie on October 31 to the north of the Cocos Islands. The newly upgraded storm tracked generally westward due to a ridge to the south, and entered the south-west Indian Ocean on November 1 as a strong tropical storm. At that time, Melanie was renamed Bellamine. After the ridged moved farther away, the storm turned more to the southwest and began quickly intensifying. Early on November 3, Bellamine attained tropical cyclone status, and the next day reached peak 10–minute winds of 175 km/h (110 mph); this made it an intense tropical cyclone. 350:

intensified into tropical cyclones, also above the normal of 4. The season was the longest on record, with the first depression in August 1996 and the final depression in July 1997. Despite the long season, there was minimal activity from March to May, which usually represents about 25% of total activity. In addition, February was relatively quiet despite being the climatological peak. Majority of the storms developed in the northeast portion of the basin, and the storms took a variety of tracks during their durations.

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November 6. That day, Bellamine began restrengthening as the eye became increasingly well-defined, 70 km (43 mi) in diameter. On November 7, the storm re-attained intense tropical cyclone status, as well as its previous peak intensity according to MFR. This was a rare occurrence of an early November storm becoming an intense tropical cyclone on two occasions. Meanwhile, the JTWC estimated peak 1–minute winds of 230 km/h (145 mph). A strong approaching

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Cyclone 3S while the storm was over the northeastern portion of the basin. This was a fairly unusual event, as there is only an average of 0.4 storms in the month of September across the southern hemisphere. Located along the northern side of a ridge, the storm tracked westward, but failed to intensity beyond 1–minute winds of 75 km/h (45 mph) due to wind shear. On September 10, the storm dissipated to the west-southwest of Diego Garcia.

1103: 591: 485: 1078:, Helinda turned to the southeast on February 2, where cooler water temperatures induced weakening. Two days later, strong wind shear contributed to further weakening, and the storm deteriorated to tropical depression status. Turning back to the west, the circulation was declared dissipated by the MFR on February 7, although the JTWC continued tracking Helinda until February 14 when the system was off the northeast coast of Madagascar. 1284: 920: 833: 665: 1358: 1177: 1445: 1111: 759: 1185: 380: 583: 751: 440:. With a large ridge to the south, the system tracked southwestward, crossing into the south-west Indian Ocean as a tropical depression on October 17. Also on that day, the JTWC began issuing warnings on the system as Tropical Cyclone 4S. On October 18, the depression intensified into Tropical Storm Antoinette after developing a well-defined 706:

than 48 hours to redevelop, the MFR policy at the time was to treat the disturbance as a new system. On December 3, the depression intensified into Tropical Storm Daniella, and an eye began to form the next day, indicative of further strengthening. The MFR upgraded Daniella to tropical cyclone status on December 5. At 1800

978:, the first cyclone to hit the region in 41 years. Gretelle rapidly weakened into a tropical depression over land, but gradually re-intensified into a moderate tropical storm in the Mozambique Channel. A trough turned the storm to the southeast on January 28, and three days later the storm dissipated south-southwest of Madagascar. 882:

re-intensify initially despite warm waters. On January 6, while turning to the south around western Madagascar, Fabriola again attained tropical storm status. The next day, the MFR estimated peak 10–minute winds of 100 km/h (60 mph), and after turning to the southeast, Fabriola struck southwestern Madagascar near

456:, and by that time it was moving quickly westward. After the circulation became largely devoid of deep convection, the storm weakened into a tropical depression on October 21. The next day, Antoinette passed about 200 km (120 mi) north of the northern tip of Madagascar, and dissipated on October 24 in the 1247:

3.6 m (12 ft) deep. Nationwide, at least 36 people were killed due to Josie, although there were initial reports of 500 people missing. On Europa Island, Josie produced maximum sustained winds of 130 km/h (80 mph), with gusts to 222 km/h (138 mph), before blowing the

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In northwestern Madagascar, Josie dropped heavy rainfall and caused widespread flooding. Several towns were isolated, forcing residents to travel by boat. The storm heavily damaged crops in the region, particularly to vanilla. The rains caused rivers to exceed their banks, resulting in flooding up to

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In Réunion, Gretelle dropped nearly 1 m (3.3 ft) of rainfall in the mountainous center of the island. The cyclone produced wind gusts of over 220 km/h (140 mph) at Farafangana, Madagascar, along with heavy rainfall that washed away the local meteorological station. Flooding up to

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of 229 mm (9.0 in) during the passage. About half of the island lost power and many lost water service. Daniella also left heavy crop damage, due to the heavy rainfall. All flights were canceled during the storm's passage. Three were three indirect deaths on Mauritius, including one from a

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After the previous Tropical Storm Chantelle lost its circulation near Diego Garcia on November 30, residual convection persisted and moved to the southwest due to a large ridge. A new tropical disturbance developed on December 2 after wind shear diminished. Because the remnants took longer

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in Mozambique was severely flooded by the storm, severely damaging several roads. Along the coast, the storm produced a wave height of about 4 m (13 ft) near Beira. Lisette and its resultant flooding destroyed 17,000 houses in Mozambique, affecting 300,000 people. Throughout the

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The long-lived Cyclone Pancho-Helinda formed on January 18 in the Australian region from the monsoon trough to the north of the Cocos Islands. For several days, the system meandered in several directions before maintaining a southwest trajectory on January 21. Around that time, the system

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turned Bellamine to the southeast on November 8 and incurred rapid weakening due to wind shear. After the trough passed the cyclone, Bellamine turned back to the southwest on November 10 as a weakening tropical depression. Two days later, the circulation dissipated without having affected

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Less than a month later, another area of convection developed within the near-equatorial trough near the Chagos archipelago, due to persistent warm water temperatures. On September 6, the MFR classified it as Tropical Disturbance A2, and the next day, the JTWC initiated advisories on Tropical

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Lisette dropped heavy rainfall across the region it traversed, causing severe flooding in central and northern Mozambique. Most of the south-central Mozambique was drenched with rainfall totals ranging from 60 mm (2.4 in) to 200 mm (7.9 in), setting numerous records. Due to the

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Toward the end of February, the ITCZ spawned a system along the Mozambique coast. With a circulation and warm water temperatures, the system developed into a tropical disturbance on February 24 just offshore northeastern Mozambique. The system slowly organized while drifting southward between

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Similar to previous storms Antoinette and Bellamine, Tropical Storm Chantelle originated from the ITCZ in the Australian region. On November 23, the MFR began tracking the system as a tropical disturbance off the west coast of Sumatra. The system fluctuated in intensity while moving westward,

276:; the subsequent two named storms also formed in the Australian region. In early December, Cyclone Daniella likely developed out of the remnants of previous Tropical Storm Chantelle. After reaching peak 10–minute winds of 185 km/h (115 mph), Daniella weakened and passed just southwest of 1521:

A tropical disturbance developed in late November, and two disturbances formed in the first few weeks of January. In the duration between when Iletta developed on January 23 and when Tropical Cyclone Josie formed on February 9, another two tropical disturbances formed, and the final two

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For several weeks in early August – the middle of winter in the southern hemisphere – an area of warm water temperatures of over 26 °C (79 °F) persisted in the northeast portion of the basin. The region was unaffected by the progression of troughs that would usually decrease the water

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With warm waters and favorable upper-level conditions, Helinda attained cyclone status on February 1, and the MFR estimated peak 10–minute winds of 185 km/h (115 mph). Around the same time, the JTWC estimated peak 1–minute winds of 215 km/h (135 mph), slightly below its

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In early December, the ITCZ spawned an area of convection near the boundary between the south-west Indian and Australian regions. On December 8, the MFR estimated that a disturbance formed just within the Australian region, which entered this basin on December 9. After the convection

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The season was active, about 50% above normal, and was the fourth consecutive above-normal season. There was a total of 100 days on which disturbances, depressions, storms, or cyclones were active, compared to the average of 68. There were 12 named storms, above the normal of 9. Five

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late on January 7. The storm again quickly weakened over land, emerging back into the Indian Ocean on January 8 as a tropical disturbance. After turning more to the south, Fabriola dissipated on January 10 when it was absorbed by a nearby trough. Fabriola spread rainfall across

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After reaching peak winds, Bellamine slowed its motion on November 4 while moving between two high-pressure areas, and weakened slightly. After another ridge built, the cyclone resumed a steady west-southwest track, although its 10–minute winds decreased to 140 km/h (85 mph) by

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On January 23, the ITCZ spawned an area of convection to the southwest of Diego Garcia, west of Helinda and east of Gretelle. The system quickly developed an organized central dense overcast, but failed to become a tropical cyclone due to the lack of a circulation in the region. Late on

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in eastern Madagascar. Around that time, the JTWC estimated peak 1–minute winds of 1–winds of 110 km/h (70 mph). Fabriola quickly weakened into a tropical depression over land and emerged into the Mozambique Channel on January 5. Due to proximity to land, the system failed to

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An area of convection formed in the northeast portion of the basin, developing into a tropical disturbance on February 14. Despite the presence of easterly wind shear, the system slowly organized into Tropical Storm Karlette on February 16. By that time, the storm had a large and

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Early on March 9, a tropical depression formed in the eastern portion of the basin, with the MFR classifying the storm as Tropical Disturbance M1. The storm attained tropical storm status according to the JTWC, and peaked with a minimum pressure of 995 mb. The storm was later named

970:, and within a day intensified into Tropical Storm Gretelle. With a large ridge to the southeast, the storm moved southwestward and gradually intensified, becoming a tropical cyclone on January 22. Around that time, the storm passed about 300 km (190 mi) northwest of 877:, becoming a tropical disturbance. After the convection organized more, the system intensified into Tropical Storm Fabriola on January 3. Moving southwestward, the storm strengthened somewhat, reaching 10–minute winds of 85 km/h (55 mph) before making landfall on the 267:

In August, a tropical depression developed in the south-west Indian Ocean for the first time 27 years, and a month later, a rare September tropical disturbance formed. The first named storm, Antoinette, was the first of several to originate in the neighboring

974:. Early on January 23, the MFR estimated peak 10–minute winds of 140 km/h (85 mph), while JTWC estimated 1–minute winds of 215 km/h (135 mph) the next day. While near peak intensity, Gretelle made landfall on southeastern Madagascar near 1502:

In addition to the named storms, the MFR tracked seven tropical disturbances and two tropical depressions throughout the year. Most were short lived, often receiving few warnings. The first two systems developed before Tropical Storm Antoinette in October.

990:, and 8,000 tons of cash crops, mostly to coffee. Overall, about 200 people were killed or left missing in Madagascar, with 152 confirmed fatalities by two weeks after the storm, and damage was estimated at $ 50 million (1997 322:. On certain days, the satellites had limited coverage in the eastern portion of the region, which limited warning capability. At the time, the MFR issued warnings on tropical cyclones in the Indian Ocean from the coast of Africa to 90° 726:

road accident and another due to electrocution. After threatening to directly strike Réunion, the cyclone passed about 110 km (68 mi) northeast of the island. As a result, winds were not as strong as on Mauritius.

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16 m (52 ft) was reported in some areas, which washed away several boats and forced residents to hold onto trees to survive. Many houses were damaged or destroyed, leaving 80,000 people homeless. The

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over 10 minutes, while estimates from the United States-based Joint Typhoon Warning Center are sustained over 1 minute. 10 minute winds are about 1.14 times the amount of 1 minute winds.

330:– a joint United States Navy – United States Air Force task force – also issued tropical cyclone warnings for the region. Wind estimates from Météo-France and most other basins throughout the world are 280:; there, the storm left heavy crop damage and indirectly caused three deaths. In early January, Tropical Storm Fabriola was the first in a succession of three storms to move over Madagascar. The next – 1823: 1231:

In late January into early February, the ITCZ produced areas of convection around the northern tip of Madagascar. One such convective system spawned a low-pressure area between Tromelin island and

1239:. An approaching cold front turned the cyclone to the southeast, bringing the storm over cooler waters and causing weakening due to increased wind shear. On February 16, Josie became 873:

Toward the end of December, the ITCZ produced a widespread area of convection to the northeast of Madagascar. A circulation developed on January 2 about 150 km (93 mi) of

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Late in its duration, Daniella passed within 55 km (34 mi) of Mauritius, producing wind gusts of 154 km/h (96 mph) and about 300 mm (12 in) of rainfall.

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that day, both the MFR and JTWC estimated peak winds; the former agency estimated 10–minute winds of 185 km/h (115 mph), making Daniella the most intense tropical cyclone

346:, beginning with Antoinette. In addition to the named storms in the year, the list included Maryse, Nelda, Ocline, Phyllis, Rolina, Sheryl, Thelma, Venyda, Wiltina, and Yolette. 1789:

Christopher W Landsea; Hurricane Research Division (April 26, 2004). "Subject: D4) What does "maximum sustained wind" mean? How does it relate to gusts in tropical cyclones?".

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of at least 120 km/h (75 mph); of these, three strengthened further into intense tropical cyclones, with Daniella and Helinda tied for strongest storm of the season.

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was the longest on record, with both an unusually early start and unusually late ending. Most activity was from November through February. According to the

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On January 3, the BoM and the JTWC ceased issuing advisories on Tropical Cyclone Phil in the Australian region, which previously moved over

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formed on October 28 within the Australian region, which initially failed to develop much due to persistent wind shear. The Australian

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Responding to Climate Change in Mozambique: Theme 2: Coastal planning and adaptation to mitigate climate change impacts

2228: 542: 444:, and began turning more to the west-southwest. That day, Antoinette strengthened to a peak intensity of just below 3238: 3384: 3122:

The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data

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The International Best Track Archive for Climate Stewardship (IBTrACS): Unifying tropical cyclone best track data

3327: 3322: 2304: 1556: 1552: 429: 432:(ITCZ) was active over the northeast portion of the basin and into the adjacent Australian region, spawning a 256:

also warned on storms in the region, which identified five other tropical storms. Five of the storms attained

3339: 3334: 2933: 2845: 2678: 1717: 1566: 1562: 244:, there were 21 tropical disturbances, 14 of which intensified into tropical depressions. There were 12 448:, or with 10–minute winds just below 120 km/h (75 mph). Around that time, the storm developed an 327: 253: 30: 2654: 3362: 3357: 2118:

FAO/WFP mission to assess the impact of crop damage by locusts on the food supply situation in Madagascar

1576: 1572: 1795:. National Oceanic and Atmospheric Administration's Atlantic Oceanographic and Meteorological Laboratory 1403:

early on March 2. Lisette turned to the west-northwest, dissipating over Zimbabwe on March 3.

452:, but that quickly dissipated. Antoinette began weakening steadily on October 20 due to increasing 2203: 707: 3269: 3265: 711: 3141: 3116: