NOAA
Noaa: National Weather Service: Jetstream: The Upper Air
Online school for weather provides a complete guide to the "upper air". Here you can learn all about the earth's atmosphere above 5000 feet and the different types of weather conditions that come from this upper atmosphere. A review quiz...
NOAA
Noaa: National Weather Service: Remote Sensing
The National Weather Service presents this site on remote sensing. Learn about Doppler radar, the Automated Surface Observing System (ASOS), and radiosondes. Review questions included.
CK-12 Foundation
Ck 12: Earth Science: Collecting Weather Data
[Free Registration/Login may be required to access all resource tools.] Describes the various instruments that scientists use to measure weather conditions, including advanced tools like satellites and radar.