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Tropical Depression Nine forms in the Gulf of Mexico, and is forecast to intensify to Tropical Storm (or possibly Hurricane) Isaias

By Scott Bachmeier •

1-minute GOES-19 Infrared Window images with plots of GLM Flash Points, from 1601 UTC on 06 October to 0200 UTC on 07 October

1-minute Mesoscale Domain Sector GOES-19 (GOES-East) Infrared Window images (above) showed Tropical Depression Nine as it gradually developed a closed center of circulation in the southwestern Gulf of Mexico by 2100 UTC on 06 October 2026. Plots of GLM Flash Points depicted the lightning activity within the slowly-organizing tropical system. The coldest cloud-top infrared brightness temperatures associated with convective bursts were -85 to -89C.

GOES-19 Visible images with an overlay of contours and streamlines of deep-layer wind shear at 2300 UTC on 06 October

Tropical Depression Nine was embedded within an environment of modest vertical wind shear, as seen in Visible images (above) and Infrared Window images (below).

GOES-19 Infrared Window images with an overlay of contours and streamlines of deep-layer wind shear at 2300 UTC on 06 October

This blog post will be updated as TD9 intensifies into Tropical Storm Isaias and then possibly Hurricane Isaias in the next few days…

Categories: GLM, GOES-19, Lightning, Tropical cyclones