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Accu weather.com: Precipitation Maps
A comprehensive site of precipitation maps for the entire U.S., regions of the U.S., individual states, and areas around the world. Includes maps showing predicted precipitation, actual precipitation, and accumulated precipitation. It...
National Weather Service
National Weather Service:climate Prediction Center: Daily Precipitation Analysis
Find real-time daily precipitation analysis for the United States, Mexico, and South America as well as accumulated precipitation maps for the past 30 or 90 days.