May 27th, 2021 | Scott Bachmeier
GOES-17 (GOES-West) “Red” Visible (0.64 um) images (above) showed the development of a subtropical storm in the South Pacific Ocean (just northeast of New Zealand) on 27 May 2021. Surface analyses from the New Zealand Met Service are available here.
GOES-17 “Clean” Infrared Window (10.3 um) images (below) highlighted the curved band of cold-topped convection wrapping into the deepening storm.
In a NOAA-20 Infrared Window (11.45 um) image viewed using RealEarth (below) showed a higher resolution view of the band of cold clouds wrapping into the system at 1206UTC.
With ample illumination from the Moon — in the Waning Gibbous phase, at 98% of Full — a Suomi NPP VIIRS Day/Night Band (0.7 um) image (below) provided a good “visible image at night”.
A Suomi NPP ATMS Microwave (183.3 GHz) image (above) portrayed a spiral band wrapping into the core of the system at 1256 UTC, while a cross section of Suomi NPP ATMS Brightness Temperature anomaly (below) depicted the deep warm core character of the subtropical cyclone.