5-minute CONUS Sector GOES-18 (GOES-West) Visible and Infrared Window images (above) showed the rapid development of a relatively compact thunderstorm east-southeast of Salt Lake City on 18 July 2026. The coldest thunderstorm cloud-top infrared brightness temperature was -48.76 C at 1741 UTC (above) — which represented an altitude just below the Most... Read More

Altocumulus castellanus clouds (ACCAS) unexpectedly developed in southern Wisconsin yesterday morning, producing beautiful cloud features and eventually a severe thunderstorm. ACCAS form due to mid-level instability and manifest in towering billows that can often produce pileus clouds as they burst through a more stable layer.The rooftop cameras of the UW-AOSS building caught... Read More

1-minute Mesoscale Domain Sector GOES-19 (GOES-East) Infrared images (above) included plots of 1-minute GLM Flash Points (which are parallax-corrected to correspond to their surface locations) — and showed an increase in thunderstorm coverage and lightning activity across southeastern Wisconsin late in the day on 15 April 2026.Unfortunately, one lightning-related fatality occurred south of... Read More

While Chicago O’Hare recently retook the crown of the country’s busiest airport in terms of number of flights, Atlanta’s Hartsfield-Jackson International Airport (ATL) continues to have the largest number of passengers. A great number of those ATL passengers were significantly inconvenienced on the evening of 6 March 2026 as a... Read More