Satellites: NOAA-15 and NOAA-17, part of NOAA's 850km-high (530 mile-high) Polar Orbiting satellites

The jet stream brings winter to the southeast
These two images were taken 90 minutes apart by NOAA-16.
They show the path of the jet stream as it undulates north and south in its eastern progression.
In the rightmost image, the stream has dipped down through the Great Lakes region all the way down to the mid-Atlantic states, bringing with it a midday cooling of the area.
Throughout the day (Friday, Jan. 21) temperatures fell from their "morning highs."
The path of the snow that hit the upper eastern part of the US may be seen clearly.
Click on the images below for a higher-resolution (>100k) version.