** GOES-16 data posted on this page are preliminary, non-operational data and are undergoing testing **GOES-!6 Visible (0.64 µm) images (above) revealed the presence of a well-defined lake breeze boundary on 14 June 2017, which extended well inland from Lake Superior across northeastern Minnesota and northwestern Wisconsin. This shallow pool of lake-cooled air... Read More

A large Mesoscale Convective System (MCS) developed and intensified over western South Dakota during the nighttime hours of 10 June – 11 June 2017, evolving into a bow echo that spread a swath of hail and strong winds from central/eastern South Dakota across Minnesota and into Wisconsin and Michigan (SPC storm reports: 10 June... Read More

A well-defined train of wind shear vortices was revealed on GOES-16 Water Vapor images — Upper-level (6.2 µm), Mid-level (6.9 µm) and Lower-level (7.3 µm) — propagating westward over the Great Lakes on 07 June 2017 (above).A larger-scale view using Mid-level 6.9 µm images (below) showed additional (and larger) vortices which were moving eastward over... Read More