- Hail Storms
 - Pictures of, and information about, hailstones and the damage they cause. - Heavy Rainfall
- 24-hour rainfall maximums by U.S. state.
- Precipitation
- Hail, rain, freezing rain, sleet, and snow.
- Rain: A Valuable Resource
- Introduction to the water cycle and the nature and importance of rain from the USGS Water Science for Schools resource.
- Surface Observed Global Land Precipitation Variations
- Monthly and annual anomaly precipitation analyses (relative to the 1951-1979 period), in millimeters.
- Tropical Rainfall Measuring Mission (TRMM)@
- Understanding Water in the Atmosphere
- Introduction to humidity, clouds, fog, rain, snow, and ice from USA Today Weather.
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