Cyclone Viyaru

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Cyclonic Storm Viyaru
Cyclonic storm (IMD scale)
Tropical storm (SSHWS)
Cyclonic Storm Viyaru over the Bay of Bengal on May 13
FormedMay 10, 2013
DissipatedMay 17, 2013
Highest winds3-minute sustained: 85 km/h (50 mph)
1-minute sustained: 95 km/h (60 mph)
Lowest pressure990 hPa (mbar); 29.23 inHg
FatalitiesAt least 24 total
Areas affectedSri Lanka, Southeastern India, Thailand, Myanmar, Bangladesh
Part of the 2013 North Indian Ocean cyclone season

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. They claimed that the name Mahasen comes from a Sinhala king. He brought prosperity to the island. So naming a destructive force of nature after him would be improper. Sri Lankan authorities instead have not given the storm a name.[1]

Cyclone Viyaru struck Southern Bangladesh on 16 May 2013. The speed of the wind was about 100 kph.[2]

Weather history[change | change source]

Storm path

An area of convection first appeared on May 4. It slowly moved eastwards and organized into a low pressure area on May 8.[source?] 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.[3] 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.[source?] Later the same day, JTWC issued the first warning for the storm. JTWC designed it 01B,[4] followed by the IMD upgrading the storm into a depression,[5] and later into a deep depression.[6]

Recent storm information[change | change source]

As of 0830 IST (0300 UTC), 16 May 2013, Cyclonic Storm Mahasen was located near latitude 21°N and longitude 90°E, about 240 km (150 mi) south-southeast of Kolkata and 240 km (150 mi) southwest of Chittagong. The storm is forecast to maintain power. It is moving northeastwards. It is expected to cross the Bangladesh coast close to Chittagong by evening of 16 May. Sustained maximum surface wind speed is estimated at 85 km/h (53 mph), gusting to 100 km/h (62 mph). Estimated minimum central pressure is at 988 mbar. Dvorak intensity of the storm is at T2.5.

Reference[change | change source]

  1. "SL unhappy with cyclone name 'Mahasen'". Colombo, Sri Lanka: Nagaland Post. May 14, 2013. Retrieved May 13, 2013.[permanent dead link]
  2. Cyclone Mahasen Struck Bangladesh
  3. Jeff Masters (May 10, 2013). "Double Trouble: twin tropical cyclones spin up in the Indian Ocean". Weather Underground. Archived from the original on May 16, 2013. Retrieved May 15, 2013.
  4. Joint Typhoon Warning Center (May 10, 2013). "Tropical Cyclone 01B (One) Warning Nr 001". United States Navy. Retrieved May 10, 2013.[permanent dead link]
  5. India Meteorological Department (May 10, 2013). "Tropical Weather Out For North Indian Ocean Issued At 1200 UTC Of 10 May, 2013". India Meteorological Department. Retrieved 10 May 2013.[permanent dead link]
  6. India Meteorological Department (May 10, 2013). "Special Tropical Weather Outlook - Issued at 1500 UTC, 10 May 2013". India Meteorological Department. Retrieved May 10, 2013.[permanent dead link]

Other websites[change | change source]

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