Later in the month, Tropical Cyclone Boloetse took an erratic track across Madagascar, killing six people when it brushed the island's southwest coast.

Intense Tropical Cyclone Carina was the strongest system of the season, attaining peak 10 minute winds of 205 km/h (127 mph) in the open waters of the eastern portion of the basin.

Sprawling Tropical Storm Diwa brought six months' worth of rainfall to the drought-ridden island of Réunion, reaching 2,943 mm (115.9 in) in the mountainous peaks.

[3] At the beginning of September 2005, the ITCZ was active in the northeastern portion of the basin, accompanied by a small circulation and scattered convection.

Early on November 24, the cyclone crossed 90º E and was renamed Alvin; at the time, the system was beginning to weaken due to cooler waters from upwelling and increased wind shear.

By November 25, the increased wind shear had exposed the circulation from the convection, indicative of rapid weakening, and on that day Alvin was downgraded below tropical cyclone status.

[21] The Intertropical Convergence Zone (ITCZ) produced an area of convection northeast of Madagascar on December 29, which had an association circulation.

[3] The rains also caused the Mutamba River to exceed its banks in Inhambane, flooding roads up to a meter (3.3 ft) deep and halting traffic.

On the next day, the circulation emerged westward into the Mozambique Channel, where low wind shear and good outflow allowed for restrengthening.

An eyewall replacement cycle and increased wind shear caused Boloetse to weaken, and on February 4, the cyclone passed within 20 km (12 mi) of southwestern Madagascar.

[3] The storm deluged coastal Mozambique with over 100 mm (3.9 in) of rainfall, causing river levels to increase in Inhambane Province.

The cyclone still maintained much of its intensity during its final approach to southwestern Madagascar, bringing estimated wind gusts of 200 km/h (120 mph) to the coast.

[30] Forecasters initially assessed the structure as akin to a mesoscale convective vortex, which is a small and short-lived system, and there was also uncertainty whether the winds were at the surface.

[3] As a result, there was a disagreement between the MFR, which estimated peak 10 minute winds of 95 km/h (59 mph), and the Meteorological Service of Mauritius, which assessed a much weaker storm.

[3][30][31] Moving southeastward in the flow of the trough, the small storm began weakening on February 20 due to strong northwesterly wind shear, which caused the convection to dwindle over the circulation.

That day, the storm passed just 80 km (50 mi) north of Mauritius, by which time the center was exposed and the intensity had dropped to tropical depression status.

[3] An active phase of the Madden–Julian oscillation increased convection across the northeastern periphery of the basin, and the ITCZ produced a distinct low-pressure area on February 21 to the east of Diego Garcia.

[30] By that time, an eye had developed within the center of increasingly organized convection, and the MFR upgraded Carina to tropical cyclone status on February 26.

[3] Continued favorable conditions, including minimal wind shear and powerful outflow, allowed Carina to intensify further while progressing slowly southwestward.

Late on February 27, the MFR upgraded the storm to an intense tropical cyclone, and the eye reached a diameter of 70 km (43 mi).

[2] Unfavorable conditions – cooler waters and stronger wind shear – caused Carina's structure to rapidly degrade after the peak intensity.

By March 2, the storm weakened below tropical cyclone status, and soon after the circulation became exposed from the convection,[3] prompting the JTWC to discontinue advisories.

Environmental conditions prevented significant convection to regenerate, and the circulation of Carina turned westward across the Indian Ocean without redevelopment.

The broad system had two foci of low pressure; one was located northeast of Madagascar near St. Brandon, and the other was to its south closer to Réunion.

[3] Despite the lack of organization, the Meteorological Service of Mauritius named the system Tropical Storm Diwa on March 3 due to the threat to the Mascarene Islands, as well as the presence of gale-force winds.

[33][3] The formative stages of Diwa brought heavy rainfall, reaching 193 mm (7.6 in) over 48 hours, to St. Brandon, as well as gale-force winds, with gusts to 120 km/h (75 mph).

Gale-force winds affected Réunion for nearly three days, due to the storm's lopsided structure, and gusts peaked at 194 km/h (121 mph) along the coast.

Diwa dropped the equivalent of six months' worth of rainfall, peaking at 2,943 mm (115.9 in) at Grand-Îlet over four days, which approached the record totals set by Cyclone Hyacinthe in 1980, making it the 6th wettest tropical system in history.

A low-pressure area formed on April 1 in the neighboring Australian basin, although the system soon after moved northwestward to cross 90º E. The low meandered for several days, unable to intensify much due to insufficient moisture in the region.

Late on April 13, the MFR upgraded the system to Moderate Tropical Storm Elia, assessing peak 10 minute winds of 75 km/h (47 mph).