![](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2022\/02\/220202_220203_ewsG1_infrared_Batsirai_anim.gif\")
<\/a>EWS-G1 Infrared Window (10.7 \u00b5m) images [click to play animated GIF | MP4<\/strong><\/a>]<\/p><\/div>US Space Force EWS-G1 (formerly GOES-13) Infrared Window (10.7 \u00b5m) images (above)<\/strong><\/em> showed Cyclone Batsirai in the South Indian Ocean — just north of the island nations of Mauritius and R\u00e9union — during the time period it was classified as a Category 4 intensity storm (00 UTC on 02 February to 15 UTC on 03 February 2022). Note that the small-diameter eye became notably larger by the end of the animation.<\/p>\n A DMSP-17 SSMIS Microwave (85 GHz) image from the CIMSS Tropical Cyclones<\/strong><\/a> site (below)<\/strong><\/em> displayed evidence that Batsirai had recently completed an eyewall replacement cycle (ERC), with the faint signature of the original small-diameter eye surrounded by the new large-diameter eye. This ERC process — seen in a 48-hour MIMIC-TC animation<\/strong><\/a> — initiated Batsirai’s gradual\u00a0 decline in intensity.<\/p>\n DMSP-17 SSMIS Microwave (85 GHz) image [click to enlarge]<\/p><\/div>EWS-G1 Visible (0.63 \u00b5m) images (below)<\/strong><\/em> showed that the small eye was initially cloud-filled, but eventually cleared during the day on 02 February — to reveal the possible existence of eye mesovortices (although such features are difficult to diagnose using 30-minute images) .<\/p>\n<\/a>