Pressure, winds, and general circulation

Forces and winds - from U. of Illinois Online Meteorology Guide
Current U.S. weather map
Animation of western hemisphere weather satellite
Animation of U.S. weather satellite

Moisture and precipitation

Clouds and precipitation (online guide from Univ. of Illinois)
Northeast radar loop (from Intellicast)
Animation of local. doppler radar
Intellicast national radar loop

UCAR real-time weather data
        with surface maps including presure and winds, temperature, and this
        Map of 24-hour accumulated precipitation for the continental U.S. (lately stuck on Feb. 13, though)

    UNISYS 24-hour precipitation
Satellite images from the Naval Research Lab
        water-vapor images - full-disk satellite pictures (can also be animated)
        3-hour rain accumulations for continental U.S. and many other areas of the globe (can be animated)
        cloud-top images of continental U.S. (can be animated; you can watch storm clouds pop up)
        tropical images - you can focus on the Atlantic or the Pacific and trace migrating cloud patterns
Satellite climate research: real-time satellite images including water vapor, rainfall, etc.
UNISYS pages:
UNISYS U.S. radar loop
UNISYS enhanced infrared loop (highlights high cloud tops)
UNISYS composite satellite/doppler radar loop
UNISYS water vapor loop
UNISYS contour plots (includes dewpoint, moisture convergence)
UNISYS upper-air contour plots (includes precipitable water, lifted index stability plots)
University of Illinois surface weather products (including dew point and pressure maps)
University of Illinois satellite weather images (virtually all can be animated)
The cloud boutique (descriptions and illustrations of cloud types from Plymouth State College)
Water Vapor in the Climate System. A Special Report.
NOAA Satellite Climate page
Pan-American Climate Studies
(includes satellite rainfall, cloud liquid water and water vapor estimates)
Tropical Atlantic satellite (Weather Channel - includes other world satellites)
GOES satellite weekly animations (includes southern U.S., Mexico and tropics)
Archive of satellite climate products (includes daily global rainfall)
Monthly rainfall images from NOAA
Animation of the monthly long-term mean rainfall (also NOAA)
 On the formation of ice crystals
        Snow crystal gallery


Interesting images and animations

Convection over Nebraska and Kansas - watch the clouds grow!
Severe convection over Ohio and Pennsylvania
CIMSS GOES gallery - miscellaneous interesting images
SSEC galleries