CHARM to join CoCoRaHS!
What is the CoCoRaHS network?
CoCoRaHS is an acronym for the Community Collaborative Rain, Hail and Snow Network. CoCoRaHS is a
unique, non-profit, community-based network of volunteers of all ages and backgrounds who work together
to measure and map precipitation. The goals of the program are:
The network originated with the Colorado Climate Center at Colorado State University in 1998 thanks in
part to the Fort Collins flood a year prior. In the years since, CoCoRaHS has expanded rapidly with over
3,500 observers in eighteen states. CoCoRaHS is used by a wide variety of organizations and individuals.
The National Weather Service, other meteorologists, hydrologists, emergency managers, city utilities
(water supply, water convervation, storm water), insurance adjusters, USDA, engineers, mosquito control,
ranchers and farmers, outdoor and recreation interests, teachers, students, and neighbors in the
community are just some examples of those who visit their web site and use their data.
- To provide accurate high-quality precipitation data to observers, decision makers and other
end-users on a timely basis.
- To act as an umbrella for one-stop precipitation information nationwide. Their ambition is to
increase the density of precipitation data available throughout the country by encouraging volunteer
weather observing, as well as by collaborating with existing precipitation networks.
- To increase community awareness about our weather by inspiring and encouraging citizens to
participate in meteorological science and have fun doing so.
- To provide enrichment activities in water and weather resources for teachers, educators and the
community at large; thus, building a collective awareness of our climate and developing citizens' skills
in scientific data collection.
Download the CoCoRaHS brochure as a PDF
What are the advantages of CHARM joining CoCoRaHS?
(Your) CHARM measurements will become part of a growing national volunteer precipitation network. You
will receive CoCoRaHS information and communications and have full access to their database and
visualization tools. You will only have to enter your data in one place - the CHARM website - to be part
of both networks. CoCoRaHS data is automatically reported to the NWS via the MADIS data stream, which
means your data is used by your local weather office. The network also supports the reporting and
archiving of asynoptic (irregular and more frequent reporting) precipitation events which the NWS can
use for flash flood or hazardous weather warnings.
Why participate in both networks?
We want to preserve the CHARM database and constituents while making our valuable measurements available
to the larger community.
How will this affect current CHARM participants?
This should be transparent to current users. You will continue to report CHARM measurements as you
currently do. However, the CHARM data entry and corresponding database will be changed to accept
additional input to support the CoCoRaHS network.
What additional data can be entered?
CoCoRaHS supports snow and hail reports as well. The CHARM data entry procedures will allow for
asynoptic (irregular and more frequent reporting of) observations.
What is the impact on new CHARM participants?
CHARM will continue to support new users in Limestone and Madison Counties, and the northern portion
of Morgan and the northwest portion of Marshall County. New CHARM participants in these regions will
receive a standard rain gauge consistent with both CHARM and CoCoRaHS standards.
BACK to CHARM Home
Technical Contact: Dr. Gary J. Jedlovec (firstname.lastname@example.org)
Responsible Official: Dr. James L. Smoot (email@example.com)
Page Curator: Kevin M. McGrath (firstname.lastname@example.org)
Last Updated: August 16, 2007