 | This article needs additional citations for verification. (November 2018) |
| Tropical cyclones in 2015 | |
|---|---|
 Year summary map | |
| Year boundaries | |
| First system | 05U |
| Formed | January 2, 2015 |
| Last system | Ula |
| Dissipated | January 12, 2016 |
| Strongest system | |
| Name | Patricia |
| Lowest pressure | 872 mbar (hPa); 25.75 inHg |
| Longest lasting system | |
| Name | Kilo |
| Duration | 21 days |
| Year statistics | |
| Total systems | 138 |
| Named systems | 92 |
| Total fatalities | 996 total |
| Total damage | $18.804 billion (2015 USD) |
During 2015, tropical cyclones formed in seven major bodies of water, commonly known as tropical cyclone basins. Tropical cyclones will be assigned names by various weather agencies if they attain maximum sustained winds of 35 knots (65 km/h; 40 mph). During the year, one hundred thirty-four systems have formed and ninety-two were named. The most intense storm of the year was Hurricane Patricia, with maximum 1-minute sustained wind speeds of 345 km/h (215 mph) and a minimum pressure of 872 hPa (25.75 inHg). The deadliest tropical cyclone was Cyclone Komen, which caused 280 fatalities in Southeast India and Bangladesh, while the costliest was Typhoon Mujigae, which caused an estimated $4.25 billion USD in damage after striking China. Forty Category 3 tropical cyclones formed, including nine Category 5 tropical cyclones in the year. The accumulated cyclone energy (ACE) index for the 2015 (seven basins combined), as calculated by Colorado State University (CSU) was 1047 units.
The most active basin in the year was the Eastern Pacific which documented 26 named systems, was its basin's most active since 1992, despite only amounting to 25 named systems in the Western Pacific. Conversely, both the North Atlantic hurricane and North Indian Ocean cyclone seasons experienced a below average season numbering 11 and 4, respectively. Activity across the southern hemisphere's three basins–South-West Indian, Australian, and South Pacific–was spread evenly, with each region recording seven named storms apiece. That hemisphere's strongest tropical cyclone was Cyclone Pam, which bottomed out with a barometric pressure of 896 mbar (hPa; 26.46 inHg) in the South-Pacific Ocean.
Tropical cyclones are primarily monitored by a group of ten warning centers, which have been designated as a Regional Specialized Meteorological Centre (RSMC) or a Tropical Cyclone Warning Center (TCWC) by the World Meteorological Organization. These are the United States National Hurricane Center (NHC) and Central Pacific Hurricane Center, the Japan Meteorological Agency (JMA), the Indian Meteorological Department (IMD), Météo-France (MFR), Indonesia's Badan Meteorologi, Klimatologi, dan Geofisika, the Australian Bureau of Meteorology (BOM), Papua New Guinea's National Weather Service, the Fiji Meteorological Service (FMS) as well as New Zealand's MetService. Other notable warning centers include the Philippine Atmospheric, Geophysical, and Astronomical Services Administration (PAGASA), the United States Joint Typhoon Warning Center (JTWC), and the Brazilian Navy Hydrographic Center (BNHC).