EWS-G1 « CIMSS Satellite Blog

Tropical Cyclone Joba makes landfall in Tanzania

April 24th, 2021 | Scott Bachmeier

US Space Force EWS-G1 Infrared (10.7 µm) images [click to play animation | MP4]

US Space Force EWS-G1 Infrared (10.7 µm) images (above) showed Tropical Cyclone Jobo as it moved west-northwestward across the Indian Ocean during the 23-24 April 2021 period, eventually making landfall in Tanzania as a weakening Tropical Depression. Jobo was traversing warm sea surface temperatures during its westward trek.

A sequence of VIIRS Infrared Window (11.45 µm) images from NOAA-20 and Suomi NPP as viewed using RealEarth (below) provided higher-resolution views of the various stages of convection associated with Jobo during the 22-24 April period.

VIIRS Infrared Window (11.45 µm) images from NOAA-20 and Suomi NPP [click to enlarge]

Posted in EWS-G1, NOAA-20, RealEarth, Suomi NPP, Tropical cyclones, VIIRS | No Comments »

Cyclone Habana in the South Indian Ocean

March 10th, 2021 | Scott Bachmeier

US Space Force EWS-G1 Infrared Window (10.7 µm) images [click to play animation | MP4]

US Space Force EWS-G1 Infrared Window (10.7 µm) images (above) displayed the well-defined eye and eyewall structure of Cyclone Habana in the South Indian Ocean on 10 March 2021. This was the second period of Category 4 intensity (ADT | SATCON) during the life cycle of Habana.

Meteosat-8 Infrared images with contours of deep-layer wind shear from the CIMSS Tropical Cyclones site (below) showed that Habana was moving through an environment of relatively low shear.

Meteosat-8 Infrared images, with contours of deep-layer wind shear [click to enlarge]

Meteosat-8 Infrared images with an overlay of 1505 UTC Metop ASCAT winds (below) depicted a fairly uniform distribution of winds within the eyewall region, as Habana developed an annular structure.

Meteosat-8 Infrared images, with a plot of Metop ASCAT winds [click to enlarge]

SSMIS Microwave (85 GHz) images from DMSP-16 at 1139 UTC and DMSP-18 at 2327 UTC are shown below.

DMSP-16 SSMIS Microwave (85 GHz) image at 1139 UTC [click to enlarge]

DMSP-18 SSMIS Microwave (85 GHz) image at 2327 UTC [click to enlarge]

Posted in DMSP, EWS-G1, Metop, Microwave, Satellite winds, Tropical cyclones | No Comments »

Cyclone Nivar makes landfall in India

November 25th, 2020 | Scott Bachmeier

US Space Force EWS-G1 Infrared (10.7 µm) images [click to play animation | MP4]

US Space Force EWS-G1 Infrared (10.7 µm) images (above) showed Category 1 Cyclone Nivar making landfall along the southeastern coast of India on 25 November 2020.

EUMETSAT Meteosat-8 Infrared Window (10.8 µm) images with contours of deep-layer wind shear from the CIMSS Tropical Cyclones site (below) indicated that Nivar was moving through an environment of low shear (and over warm water) — factors favorable for the storm maintaining its intensity.

Meteosat-8 Infrared Window (10.8 µm) images, with contours of deep-layer wind shear [click to enlarge]

Posted in EWS-G1, Meteosat, Satellite winds, Tropical cyclones | No Comments »

Cyclone Gati makes landfall in Somalia

November 22nd, 2020 | Scott Bachmeier

EWS-G1 Visible (0.63 µm) images [click to play animation | MP4]

US Space Force EWS-G1 Visible (0.63 µm) images (above) showed Category 2 Cyclone Gati as it made landfall along the east coast of Somalia on 22 November 2020. The tropical cyclone rapidly intensified (ADT | SATCON) as it moved westward across the North Indian Ocean (through a corridor of low wind shear).

EWS-G1 Infrared Window (10.7 µm) images (below) revealed cloud-top infrared brightness temperatures in the -70 to -80ºC range as the eye was forming after 02 UTC. The eye of Gati opened quickly, but then collapsed and became cloud-filled shortly before landfall. It bears mentioning that in the historical record there are no tropical cyclones of Hurricane intensity making landfall in Somalia.

EWS-G1 Infrared Window (10.7 µm) images [click to play animation | MP4]

A similar loop of #CycloneGati, but from the US Space Force EWS-G1 (Electro-optical #Infrared Weather System Geostationary), infrared window animation: https://t.co/qVrtpn7Yk4 H/T @UWSSEC @UWCIMSS https://t.co/R4ypVZuK2m pic.twitter.com/EBET0EhVHs

— Tim Schmit (@GOESguy) November 23, 2020

EWS-G1 Water Vapor (6.5 µm) images (below) also showed the apparent merger of 2 convective clusters — in addition to their brief Fujiwhara-type rotation — prior to Gati’s intensification and the formation of an eye.