Supercell thunderstorms developed along and ahead of an advancing cold frontal boundary and moved rapidly eastward across parts of northern and central Wisconsin on 10 April 2011. These severe storms produced  widespread damaging winds, large hail (up to 3.0 inches in diameter), and a significant number tornadoes (see: NWS La Crosse | NWS Green Bay | NWS Milwaukee | SPC Storm Reports).... Read More

A McIDAS false-color Red/Green/Blue (RGB) image (created using MODIS Bands 07/02/01) showed numerous “burn scars” (red-enhanced features) that remained from recent fire activity across eastern Kansas and eastern Oklahoma on 05 April 2011 (above). Previous blog posts displayed imagery of the fires as... Read More

Water vapor imagery from Monday 4 April 2011 over the Gulf of Alaska shows the development of what appears to be Kelvin-Helmholtz instability, an instability that occurs in regions of strong shear. In this case, the shear zone occurs within a gradient of moisture along the edge of a polar... Read More