Met-9 Tropical Airmass, 7 May 2022

Tropical Cyclone couple over Indian Ocean

 

Met-9 Tropical Airmass, 7 May 2022
Met-9 Tropical Airmass, 7 May 2022

Two cyclones developed simultaneously north and south of the equator along the same longitude in the Indian Ocean in May 2022.

Last Updated

29 June 2022

Published on

21 June 2022

Between 6 and 10 May Tropical Cyclone Ansani developed in the Bay of Bengal. In parallel Tropical Cyclone Karim evolved in the south-west part of the Indian Ocean (well off Australia).

Met-9 Tropical Airmass, 7 May 2022
Figure 1: Meteosat-8 Tropical Airmass RGB with ERA5 streamlines overlaid, 7 May 21:00 UTC

Figure 1 shows the situation on 7 May at 21:00UTC when both tropical cyclones were close to their mature stage. The Airmass RGB from Meteosat-8 (with tropical tuning that enhances the towering convection) is overlaid with data from the ERA5 re-analysis, the streamlines at 500hPa on the left image and the divergence at 200hPa on the right side. The streamlines highlight the dominant circulation along the equator and around the tropical cyclones. The divergence field reveals that there was still considerable divergence over the central parts of the tropical cyclones (patches with red to orange contours), sustaining the vertical circulation.

The evolution of the two systems can be followed in the half-hourly sequence of tropically tuned Airmass RGBs between 6 and 10 May.

Figure 2: Meteosat-8 Tropical Airmass RGB, 6 May 12:00 UTC-11 May 00:00 UTC 

After reaching the mature stage, Ansani turned westward and made landfall on the Indian coast. Karim travelled southward and dissolved over open waters in the mid-latitudes.

A similar event occurred with the tropical cyclone couple Fani and Lorna at the end of April 2019.