The National Weather Service has issued a blizzard warning for a huge swath of the Midwest stretching from Colorado to Wisconsin's Lake Michigan shoreline. The warnings indicate snow accumulations of up to 12 inches, complemented by 25- to 35-mph winds that will occasionally gust to 45 to 50 mph. Snow is visible over the western half of the United States in today's MODIS Aqua rgb image. The National Weather Service National Operational Hydrologic Remote Sensing Center snow water equivalent image (top right image) show up to 10 inches of snow accumulation over these locations.
Air quality in the Great Lakes was Moderate (Code Yellow PM2.5 AQI), as shown in the EPA Airnow animation below. The increase of particle pollution over this region was triggered by a surface high pressure over the region. The high pressure system caused winds to diminish limiting pollutant dispersion. Here in Baltimore, good air quality was experienced. Lidar observations show a cloud capped boundary layer (red counts in lidar image) that extended up to 1.5 km.