Cyclone Hary

Very Intense Tropical Cyclone Hary was the strongest tropical cyclone in the 2001–02 South-West Indian Ocean cyclone season. Developing on March 5 from the monsoon trough, the storm initially moved generally to the west and gradually intensified. With favorable conditions, Hary quickly intensified on March 7, developing an eye and well-defined outflow. After reaching an initial peak, the cyclone briefly weakened due to an eyewall replacement cycle, by which time the storm turned southwestward toward Madagascar. Hary re-intensified and attained peak winds of on March 10 just offshore eastern Madagascar, which made it the first very intense tropical cyclone since 2000.

After peaking, Hary weakened due to land interaction, and it struck Madagascar southeast of Antalaha. It was turning south over land, and as a result it quickly moved offshore. There were three deaths in the country, one of which from electrocution. There was locally heavy crop damage, and four bridges were destroyed. However, the damage was considered minimal, given the intensity of the storm. After affecting Madagascar, Hary accelerated to the southeast, and the eastern periphery of the circulation moved over Réunion. On the mountain peaks of the island, rainfall reached , although it was much less near the coast. The rainfall caused flooding, killing one person, and 20,000 people were left without power. Hary became extratropical on March 13, although its remnants continued for several days as a powerful mid-latitude storm.

Meteorological history

In early March 2002, tropical activity was minimal in the southern Indian Ocean, limited to an area of convection, or thunderstorms, located southwest of Diego Garcia along the monsoon. On March 4, a broad and elongated low pressure area developed within the system, although moderate wind shear in the region initially prevented significant development. The next day, the circulation became better defined, and after being nearly stationary for a few days, it began moving steadily to the west-southwest, due to a ridge to the southeast. On March 5, Météo-France (MFR) classified the system as a tropical disturbance, and later Tropical Depression 11. At 0000 UTC on March 6, the Joint Typhoon Warning Center (JTWC) initiated advisories on Tropical Cyclone 18S, and six hours later MFR upgraded the system to Moderate Tropical Storm Hary.

After becoming a tropical storm, Hary was located beneath an anticyclone and in an area of minimal wind shear. It turned to a general westward motion, with its convection wrapping into the center and developing into a central dense overcast. A ragged eye formed on March 7, which gradually became more organized. That day, the JTWC upgraded Hary to the equivalent of a minimal hurricane, with 1 minute winds of . By that time, the storm had developed good outflow, and was in the midst of a period of rapid deepening. Early on March 8, MFR upgraded Hary to tropical cyclone status, and the storm became very compact, with gales extending only from the center. While rounding the northwest edge of a ridge, Hary turned to the southwest late on March 8, toward the northeast coast of Madagascar. After reaching 10 minute sustained winds of , Hary weakened slightly due to an eyewall replacement cycle, which resulted in the eye becoming indistinct until it was replaced by a larger outer eyewall. After the new eye formed, the cyclone again intensified, and Hary became a very intense tropical cyclone early on March 10, with peak 10 minute winds of , according to the MF. It was the first very intense tropical cyclone since Cyclone Hudah in 2000, and made Hary the strongest storm of the season. Around that time, the JTWC estimated that Hary attained peak 1 minute winds of .

Around the time of its peak intensity, Hary was located about off the east coast of Madagascar. While approaching the coast, the cyclone was turning toward the south, although its motion was not southerly enough to keep the storm offshore. At around 1200 UTC on March 10, Hary made landfall about southeast of Antalaha, slightly below peak intensity. The eye rapidly weakened before landfall, possibly due to another replacement cycle, and land interaction further deteriorated the storm. By late on March 10, MFR downgraded Hary to tropical cyclone status, with winds of , about east of ÃŽle Sainte-Marie. Subsequently, Hary turned more toward the south-southeast, steered by an approaching trough that increased wind shear. The cyclone stopped weakening, and the eye began redeveloping. Early on March 12, Hary passed about west of the French island of Réunion, when the JTWC estimated its 1-minute winds were about . Later that day, the combination of increasing wind shear and cooler waters weakened the cyclone, resulting in the cloud structure to deteriorate. After the circulation became fully exposed from the convection, MFR estimated Hary became extratropical around 1200 UTC on March 13. The circulation expanded greatly afterward as the storm continued generally to the southeast. The remnants of Hary re-intensified on March 17 while passing about southwest of ÃŽle Amsterdam in the south-central Indian Ocean. It moved south of the 40th parallel south, and continued as a powerful storm in the westerlies.

Impact

Cyclone Hary passed about south of the Agalega Islands on March 7, producing winds of only ; this was due to the cyclone's small size.

On March 9, as Hary intensified to the northeast of Madagascar, officials in Antsiranana Province placed the area under a state of alert. The following day, the storm clipped the eastern portion of the province as a Very Intense Tropical Cyclone, with maximum winds estimated at . While passing near ÃŽle Sainte-Marie, the storm produced a wind gust of , although the storm was weakening and located east of the island at the time. Hary dropped heavy rainfall in eastern Madagascar, and a 24‑hour peak of was reported in Tamatave. Initially, communication difficulties prevented reports of damage from leaving the region. Despite the intensity of the storm, overall damage was minimal, and much less than predicted. Two bridges were destroyed each in Antalaha District and Fenoarivo Atsinanana. Further south in Toamasina, high winds downed telephone lines and cut communications. Hary destroyed a hospital, and along its path it severely damaged food crops. One person died from electrocution, and there were three deaths overall in the country.

Although the center of Cyclone Hary passed well to the west of Réunion, heavy rains associated with the storm caused significant flooding on the island. The cyclone began affecting the island when it was located over Madagascar, after the large circulation spread humid air to the area and produced heavy rainfall through orographic lift. Over a 12‑hour span, fell in La Plaine-des-Palmistes, and the highest rainfall was in Bébourg during the storm's passage. The heaviest rainfall occurred at high altitudes, and along the coast, rainfall reached about in Saint-Philippe. These rains caused the Ravine du Chaudron to swell and flood nearby Saint-Denis. One person drowned after attempting to cross the swollen river. Several roads were washed out across the region, cutting off Cilaos from nearby areas. High winds, peaking at , associated with Hary's passage left approximately 20,000 residences without power. Hary also produced waves during its passage. There was no major damage on Réunion, which was still recovering from the deadly Cyclone Dina two months prior. Rainfall from Hary spread to nearby Mauritius, although effects there were not as severe.

See also

* Tropical cyclones in 2002
* Weather of 2002
*Tropical cyclones in the Mascarene Islands
*Cyclone Gafilo – similarly intense cyclone that struck northeastern Madagascar in 2004
* Cyclone Indlala – struck northeastern Madagascar in 2007

References

External links

Joint Typhoon Warning Center (JTWC)
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Météo France (RSMC La Réunion)






{{Very intense tropical cyclones

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