AWIPS images of the  GOES-13 fog/stratus product (above) showed a patch of stratus cloud that developed quickly as it moved northeastward across southern Wisconsin during the pre-dawn hours on 06 January 2009. In advance of this cloud feature, air temperatures were dropping off as clear skies and light winds were promoting strong... Read More

AWIPS images of the GOES-13 fog/stratus product (above) showed a plume of advection fog curling northwestward across southern Oklahoma on 02 January 2009. A relatively moist low-level air mass with dew points in the 40s F was flowing from northeastern Texas into southeastern Oklahoma (where radiational cooling was allowing surface air temperatures... Read More

Even though very cold arctic air had invaded much of the north-central US  (minimum temperatures on the morning of 15 December were -33º F at Havre, Montana and -28º F at Bottineau, North Dakota), the deeper man-made lakes (created by dams) along the Missouri River remained unfrozen on 16 December... Read More

A cold and moist upslope (northeasterly) flow had pushed up against the Front Range of the Rocky Mountains in Colorado during the pre-dawn hours on 20 November 2008 — a comparison of AWIPS images of the MODIS Fog/Stratus product and the topography (above) showed that the western edge of the... Read More