2015 North Indian Ocean cyclone season

The 2015 North Indian Ocean cyclone season is an ongoing event in the annual cycle of tropical cyclone formation. The North Indian Ocean cyclone season has no official bounds, but cyclones tend to form between April and December, with the peak from May to November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean.

The scope of this article is limited to the Indian Ocean in the Northern Hemisphere, east of the Horn of Africa and west of the Malay Peninsula. There are two main seas in the North Indian Ocean — the Arabian Sea to the west of the Indian subcontinent, abbreviated ARB by the India Meteorological Department (IMD); and the Bay of Bengal to the east, abbreviated BOB by the IMD.

The official Regional Specialized Meteorological Center in this basin is the India Meteorological Department (IMD), while the Joint Typhoon Warning Center releases unofficial advisories. On average, four to six storms form in this basin every season.[1]

Cyclone Storm Ashobaa
Under the influence of an ongoing onset of a southwest monsoon, a low pressure area formed on June 6. It slowly consolidated, prompting the Joint Typhoon Warning Center (JTWC) to issue a Tropical cyclone formation alert (TCFA) on June 6.[2] The following day, the India Meteorological Department (IMD) issued its first advisory for the system, designating it ARB 01. Later the same day, the JTWC reported the storm had reached tropical cyclone intensity, and on June 8, the IMD upgraded the storm to a cyclonic storm, assigning it the name Ashobaa. The storm continued to track northwestwards for a while, before turning westwards and weakening due to moderate to high wind shear and land interaction.

Due to most of the moisture being drawn into the storm, the onset of the southwest monsoon over the Indian subcontinent was stalled.[3] Torrential rains fell across much of eastern Oman, with Masirah Island receiving 225 mm (8.9 in) of rain in one day and more than 250 mm (9.8 in) overall.[4][5] Significant flooding prompted dozens of evacuations while strong winds caused power outages.[6] Waterlogging was reported in Kalba and Fujairah, in the United Arab Emirates, due to disturbed weather attributed to Ashobaa.

Cyclone Storm Komen
Tropical Cyclone Komen threatened Bangladesh and Myanmar, regions already reeling from floods and mudslides that had killed 27 people.