CIMSS-NOAA Weekly Report [ Archive ]

CIMSS-NOAA WEEKLY HIGHLIGHTS FOR THE WEEK ENDING JULY 31, 2026

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CIMSS Satellite Blog Updates: The Cooperative Institute for Meteorological Satellite Studies (CIMSS) Satellite Blog was updated with the following posts: "Pacific Hurricane Fausto Continues Westward Trek" (Jul. 24), "Clusters of thunderstorms produce large hail and strong winds across South Dakota" (Jul. 25), "Hurricane Genevieve rapidly intensifies to a Category 5 storm in the East Pacific" (Jul. 26) and "Tornadoes (including the Appleton/Menasha EF3), large hail and damaging winds from northern Wisconsin to the Chicago area" (Jul. 27). (S. Bachmeier, T. Wagner, CIMSS, 608.890.1980)

  (Click image to enlarge)

Figure: GOES-19 Visible image with plots of GLM Flash Points (white dots) at 2000 UTC on July 26, 2026 -- showing low-altitude mesovortices within the eye (and lightning activity within the surrounding eyewall) of Hurricane Genevieve as it was reaching Category 4 intensity over the East Pacific Ocean.

  (Click image to enlarge)

Figure: GOES-19 Visible image (left) and Infrared Window image (right) with plots of tornado reports (T) at 1656 UTC on July 27, 2026 -- showing thunderstorms that produced the EF3-rated tornado that devastated Appleton/Menasha in northeastern Wisconsin, in addition to a tornado in the Chicago area.

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