USGS WaterWatch Web Site
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USGS WaterWatch

Thanks to a network of over 3,000 stream gages monitored by the U.S. Geological Survey, and the WaterWatch web site, we can easily study how rain and snow impact local streams, rivers and estuaries.
NDBC Homepage
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A Treasure Trove of Buoy Data

NOAA's National Data Buoy Center is tasked with operating and maintaining a network of over 250 buoys and shore stations that collect and relay real-time data on atmospheric and ocean conditions.