page_title: Cyclone Viyaru
section_title: Weather history
hierarchical_section_title: Cyclone Viyaru / Weather history
caption_attribution_description: English: Track map of Cyclone Viyaru of the 2013 North Indian Ocean cyclone season. The points show the location of the storm at 6-hour intervals. The colour represents the storm's maximum sustained wind speeds as classified in the Saffir–Simpson scale (see below), and the shape of the data points represent the nature of the storm, according to the legend below. Saffir–Simpson scale Tropical depression≤38 mph≤62 km/h Category 3111–129 mph178–208 km/h Tropical storm39–73 mph63–118 km/h Category 4130–156 mph209–251 km/h Category 174–95 mph119–153 km/h Category 5≥157 mph≥252 km/h Category 296–110 mph154–177 km/h Unknown Storm type Tropical cyclone Subtropical cyclone Extratropical cyclone / Remnant low / Tropical disturbance / Monsoon depression
context_page_description: Cyclonic Storm Viyaru, formerly known as Cyclonic Storm Mahasen, was an active tropical cyclone. It passed over the Bay of Bengal. It threatened Myanmar and Bangladesh. Its origin was a low pressure area in the Bay of Bengal. The low pressure area was created in the first week of May. Viyaru slowly developed. It became a depression on May 10 by almost remaining still. Gradually it gained speed on May 11 and became a cyclonic storm. It was the first storm of the season. At first the system's ultimate direction was not clear, but moved closer to eastern India. On May 14, the circulation of Viyaru turned northeastward.
  Myanmar recommended a large evacuation in order to be prepared for the storm; however, for this reason people wanted to escape by boat. As a result, they made boats overcrowded, and one or more boats capsized. This killed at least eight people. The storm had extensive cloud mass, which brought unsettled weather to Sri Lanka, Thailand, and southeastern India. Severe storms in India and Sri Lanka killed 15 people and caused major damage. One person was killed in Thailand.
  The name Mahasen caused some argument from nationalists and officials in Sri Lanka.
context_section_description: An area of convection first appeared on May 4. It slowly moved eastwards and organized into a low pressure area on May 8. A pulse in the Madden–Julian oscillation, together with a convective Kelvin wave allowed the system to develop. These oscillations also caused Tropical Storm Jamala to form. The JTWC later issued a Tropical Cyclone Formation Alert (TCFA) on May 10, after the system became more organized. The IMD upgraded it to a well-marked low pressure area. Later the same day, JTWC issued the first warning for the storm. JTWC designed it 01B, followed by the IMD upgrading the storm into a depression, and later into a deep depression.
caption: Storm path
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