What exactly is CoCoRaHS?
Simply put, it is a 100% volunteer-based, non-profit network of observers who report 24hr precipitation measurements!  The CoCoRaHS program started in Colorado in 1998, partly in response to a devastating flash flood that hit Fort Collins, CO in 1997.  Utilizing simple, inexpensive observing tools, this program aims to measure and map out precipitation across the nation, providing high quality data for use in climate, natural resource, education and research applications along the way.  Since it's inception, CoCoRaHS has grown to include over 30 states and an average of almost 5,000 daily reports from observers across the United States.

Who can join?
Anyone with internet access!  That is the beauty of this program.  Whether you live in a house in the city, or out in the country, if you've got access to the internet you have the potential to be a CoCoRaHS observer!

How do I join?
Joining the program is easy!  Simply visit the CoCoRaHS home page and click the Join CoCoRaHS link on the left hand side.  It's a pretty self explanatory process from that point on.  You will be asked to provide various pieces of information (such as your address, latitude/longitude and elevation if you know it).  This information will be used to properly map your observation once you start reporting.

After joining, there are three very simple things that are required of you.  The first is getting some training.  You may look at the online training session (provided by CoCoRaHS headquarters), or attend a local in-person training session.  A list of these sessions can be found on the Washington, or Oregon CoCoRaHS home pages.  If you would like to attend a live training session, and do not see one listed, simply contact your local coordinator and request one in your area.  The second requirement is to purchase a standard 4" rain gauge.

The last requirement, and perhaps the most important, is for you to maintain your love and enthusiasm for watching and observing weather!  While CoCoRaHS is obviously scientific in purpose, it is also meant to be fun and informative for those participating!