![\"GOES-16](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/images\/2021\/04\/210420_goes16_visible_STS_Potira_anim.gif\")
<\/a>GOES-16 \u201cRed\u201d Visible (0.64 \u00b5m)<\/em> images [click to play animation | MP4<\/strong><\/a>]<\/p><\/div>1-minute\u00a0Mesoscale Domain Sector<\/strong><\/a>\u00a0GOES-16\u00a0(GOES-East)<\/em>\u00a0\u201cRed\u201d Visible (0.64 \u00b5m<\/strong><\/a>) images (above)<\/strong><\/em> showed the circulation of Subtropical Storm Potira (warning<\/strong><\/a>\u00a0issued by MARINHA<\/strong><\/a>) off the southeast coast of Brazil on 20 April 2021.<\/p>\n In the corresponding 1-minute GOES-16 \u201cClean\u201d Infrared Window (10.35 \u00b5m<\/strong><\/a>) images (below)<\/strong>,<\/em> intermittent convective overshooting tops exhibited infrared brightness temperatures as cold as -60 to -65\u00baC (shades of orange)<\/em>.<\/p>\n GOES-16 \u201cClean\u201d Infrared Window (10.35 \u00b5m)<\/em> images [click to play animation | MP4<\/strong><\/a>]<\/p><\/div>Combined plots of all GOES-16 Atmospheric Motion Vector types — Visible, Infrared and Water Vapor — and pressure levels at 15-minute intervals (below)<\/strong><\/em> displayed the cloud motions of Potira (credit: Dave Stettner and Chris Velden, CIMSS). The algorithm used to generate these AMVs differs slightly from that used to create operational Derived Motion Winds<\/strong><\/a>: some constraints are relaxed\/removed, and Visible winds are calculated at pressure levels above 700 hPa — all of which results in the display of a higher density of tracked targets and their calculated wind vectors.<\/p>\n Combined plots of all GOES-16 Atmospheric Motion Vector types (Visible, Infrared and Water Vapor) and pressure levels, at 15-minute intervals [click to play animation | MP4<\/strong><\/a>]<\/p><\/div>A sequence of EUMETSAT<\/strong><\/a> Metop ASCAT surface scatterometer winds (source<\/strong><\/a>) is is shown below — the strongest winds were located within the southern sector of the storm, well away from the center of circulation.<\/p>\n Metop ASCAT surface scatterometer winds [click to enlarge]<\/p><\/div>\n ===== 22 April Update =====<\/strong><\/p>\n GOES-16 \u201cRed\u201d Visible (0.64 \u00b5m)<\/em> images [click to play animation | MP4<\/strong><\/a>]<\/p><\/div>1-minute GOES-16 Visible images (above)<\/strong><\/em> showed that the low-level circulation center of Potira remained exposed on 22 April — while GOES-16 Infrared images (below)<\/strong><\/em> indicated that deep convection remained south and west of the storm center.<\/p>\n<\/a><\/a><\/a><\/a>