GPM's ground validation campaign called OLYMPEX is in full swing! (See my earlier blog post for more background about the campaign.)
You can visit the OLYMPEX website to see daily precipitation data, like this image below:
If you go to the website itself, you can click on any of the points to get more detailed information about that station, see the latest satellite and coastal radar images, and read science summaries. For a quicker overview, here are two videos about the campaign.
One produced by NASA:
And one produced by the Weather Channel: