Last month someone named Jeremy Cothran from the University of South Carolina posted some interesting data at the Google Earth Community. He works with the Carolinas Coastal Ocean Observing and Prediction System (Caro-COOPS), and they have made available a large collection of sensor data for sea and weather conditions. Their focus is with the Southeast US, but they have added sensor data for both North and South America and Hawaii. Jeremy said the data is updated hourly and includes both placemarks with the data in the descriptions, and some image overlays for sea surface temperature and other satellite/radar data (mostly low resolution though). You can download this network link which automatically updates once per hour.
Not only are there a lot of data placemarks, but if you click on a placemark and look at the weather data you will see links for the data. If you click on the data you are taken to web sites which provide historical statistics and graphs. See this for example which shows wind gusts for the last several hours at a buoy off the coast of the Carolinas. This application is yet another example of growing sensor nets for science which Nature Magazine’s Senior Editor Declan Butler has written about. Via OgleEarth.