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Cyclone Nivar makes landfall in India

By Scott Bachmeier •

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... Read More

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 [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]

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

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Shear vortices over the East Pacific Ocean

By Scott Bachmeier •

 GOES-17 (GOES-West) Upper-level Water Vapor (6.2 µm) and Air Mass Red-Green-Blue (RGB) images (above) displayed a series of shear vortices migrating southward over the East Pacific Ocean (off the cost of the Pacific Northwest) on 24 November 2020. The ribbon of brighter orange to red hues on the RGB images highlight regions of dry, ozone-rich air where the tropopause... Read More

 

GOES-17 Upper-level Water Vapor (6.2 µm) and Air Mass RGB images [click to play animation | <strong>MP4</strong>]

GOES-17 Upper-level Water Vapor (6.2 µm) and Air Mass RGB images [click to play animation | MP4]

GOES-17 (GOES-West) Upper-level Water Vapor (6.2 µm) and Air Mass Red-Green-Blue (RGB) images (above) displayed a series of shear vortices migrating southward over the East Pacific Ocean (off the cost of the Pacific Northwest) on 24 November 2020. The ribbon of brighter orange to red hues on the RGB images highlight regions of dry, ozone-rich air where the tropopause was at a significantly lower altitude compared to adjacent areas.

GOES-17 Water Vapor images with isotachs of NAM40 model maximum wind speed (below) showed that these vortices were forming within a very tight gradient in wind velocity (which existed just to the left of a southward-moving polar jet streak) — so speed shear was a mechanism playing a role.

GOES-17 Upper-level Water Vapor (6.2 µm) images, with isotachs of NAM40 model maximum wind speed [click to enlarge]

GOES-17 Upper-level Water Vapor (6.2 µm) images, with isotachs of NAM40 model maximum wind speed [click to enlarge]

GOES-17 Air Mass RGB images with and without contours of NAM40 model PV1.5 pressure (below) indicated that the dynamic tropopause descended to the 500-600 hPa level in the vicinity of the most well defined shear vortices. Occasionally aircraft encounter turbulence near these types of vortices — but in this case, there were no pilot reports of turbulence in those areas.

GOES-17 Air Mass RGB images, with and without contours of NAM40 model PV1.5 pressure [click to play animation | MP4]

GOES-17 Air Mass RGB images, with and without contours of NAM40 model PV1.5 pressure [click to play animation | MP4]

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Medicane makes landfall in Tunisia

By Scott Bachmeier •

EUMETSAT Meteosat-11 High Resolution Visible (0.8 µm) images (above) showed a westward-moving medicane which developed a fairly distinct eye shortly before making landfall along the eastern coast of Tunisia on 22 November 2020.A Suomi NPP VIIRS True Color Red-Green-Blue (RGB) image displayed using RealEarth (below) provided a higher-resolution view of... Read More

EUMETSAT Meteosat-11 High Resolution Visible (0.8 µm) images [click to play animation | MP4]

EUMETSAT Meteosat-11 High Resolution Visible (0.8 µm) images [click to play animation | MP4]

EUMETSAT Meteosat-11 High Resolution Visible (0.8 µm) images (above) showed a westward-moving medicane which developed a fairly distinct eye shortly before making landfall along the eastern coast of Tunisia on 22 November 2020.

A Suomi NPP VIIRS True Color Red-Green-Blue (RGB) image displayed using RealEarth (below) provided a higher-resolution view of the medicane’s eye and convective banding at 1152 UTC.

Suomi NPP VIIRS True Color RGB image valid at 1152 UTC [click to enlarge]

Suomi NPP VIIRS True Color RGB image valid at 1152 UTC [click to enlarge]

A plot of surface observations for Monastir’s Habib Bourguiba International Airport DTMB (below) showed that winds gusted to 43 knots as the system made landfall.

Plot of surface observations for Monastir's Habib Bourguiba International Airport [click to enlarge]

Plot of surface observations for Monastir’s Habib Bourguiba International Airport [click to enlarge]

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Cyclone Gati makes landfall in Somalia

By Scott Bachmeier •

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... Read More

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

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]

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


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.

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