AWIPS images of the MODIS visible and “snow/ice” channels from 13 December 2007 (above; closer view) reveal that much of the southeastern half of Iowa received a significant glazing of ice (0.25 to 1.0 inch) during a freezing drizzle/freezing rain event on 10-11 December. Snow and ice particles are very strong absorbers at the 1.6 µm wavelength of the... Read More
GOES-10 IR imagery with QuikSCAT winds (above) sourced from the CIMSS Tropical Cyclones site showed that the maximum surface winds associated with Subtropical Storm Olga were located well to the north of the center of the circulation early in the day on 11 December 2007. However, ASCAT wind data later in the... Read More
Just as the 2007 Atlantic Tropical Cyclone season started off a bit early (with Subtropical Storm Andrea in early May), it also is ending a bit late with the formation of Subtropical Storm Olga on 10 December 2007. An animation of GOES-10 IR images (above) sourced from the CIMSS Tropical Cyclones site shows the cluster of cold cloud top... Read More
AWIPS images of the GOES-10 10.7 µm IR channel (above) showed a patch of low-level stratus cloud drifting north-northeastward across Iowa, Minnesota, and Wisconsin on 10 December 2007. Note how the tops of the cloud feature appeared warmer (darker gray enhancement) than the adjacent cloud-free (but snow-covered) areas; the term... Read More
