Alert: Two Cyclones Observed in the Indian Ocean

A pair of tropical cyclones, one on each side of the equator, is putting on a show for satellites passing over the Indian Ocean.

Twin Cyclones in the Indian Ocean

On May 8, 2022, theĀ Visible Infrared Imaging Radiometer SuiteĀ (VIIRS) onĀ NOAA-20Ā captured this natural-color image of the storms at 12:55 p.m. local time (07:55 Universal Time).

The twin cyclones were spinning at roughly the same distance from the equator, butĀ in opposite directions. A cycloneā€™s winds spin counterclockwise in the Northern Hemisphere but clockwise in the Southern Hemisphere due to theĀ Coriolis effectā€”a force driven by Earthā€™s rotation that deflects prevailing winds in one direction in the Northern Hemisphere and the opposite direction in the Southern Hemisphere.

In the northern Indian Ocean, Tropical Cyclone Asani advanced west-northwest on May 8 and had maximum sustained winds of 100-110 kilometers (60-70 miles) per hour as it moved across the Bay of Bengal.

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Forecasters for the Indian Meteorological Department (IMD) expect Asani to weaken as it approaches southern India andĀ curves northeast, keeping the storm offshore along the Andhra Pradesh-Odisha coast in the coming days. IMD has called for the suspension of all fishing operations in the most affected areas.Ā Heavy rainsĀ pose the biggest threat on land.

South of the equator, Tropical Cyclone Karim is roaming open seas west of Australia. With winds peaking at the equivalent of a category 1 hurricane, theĀ U.S. Joint Typhoon Warning Center expectsĀ Karim to weaken quickly as it encounters high levels of wind shear in the coming days. The storm does not pose a threat to major population centers, though it could affect theĀ Cocos Islands, a chain of coral islands with a population of 600.

An eastward moving tropical disturbance called theĀ Madden-Julian OscillationĀ helped fuel the twin storms by promoting convection and strong westerly winds, according toĀ reporting from The Weather Channel.

NASA Earth Observatory image by Lauren Dauphin, using VIIRS data from NASA EOSDIS LANCEGIBS/Worldview, and the Joint Polar Satellite System (JPSS). Story by Adam Voiland.

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