Hurricane Marie in the East Pacific Ocean1-minute Mesoscale Domain Sector GOES-17 (GOES-West) “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.35 µm) images (above) showed Category 4 Hurricane Marie over the East Pacific Ocean on 02 October 2020. Although there was frequently some high cloud debris covering the eye, hints of low-altitude mesosvortices within the eye could be seen at times. The coldest cloud-top infrared brightness temperatures were in the -85 to -88ºC range.
===== 03 October Update =====
A toggle between time-matched Infrared Window images of the eye and eyewall region of Hurricane Marie from Suomi NPP (SNPP) and GOES-17 (below) highlighted the differences in spatial resolution — 375-m with SNPP VIIRS, vs 2-km (at satellite sub-point) with GOES-17 ABI — and the parallax displacement inherent with GOES-17 imagery at that location (approximately 9 km to the northeast). The coldest cloud-top infrared brightness temperature was -85.4ºC on the SNPP image, compared to -81.8ºC on the GOES-17 image; small-scale features such as the gravity waves propagating radially outward from the eye were seen in the higher resolution SNPP image. Note: the 0929 UTC time stamp on the SNPP image was the time that the ground station antenna began receiving the descending overpass signal – the satellite actually passed over Marie’s location at 0943 UTC.