CM1 Homepage


7 October 2015: A new version of CM1 (cm1r18.3) was released. (See the "Code" section below.)

What is CM1?

In scientific terms: CM1 is a three-dimensional, non-hydrostatic, non-linear, time-dependent numerical model designed for idealized studies of atmospheric phenomena.

In non-scientific terms: CM1 is a computer program used for atmospheric research. It is designed for studies of relatively small-scale processes in the Earth's atmosphere, such as thunderstorms.

For more information, please read these answers to frequently asked questions about CM1.


Download the code here. (Most recent version: cm1r18.3, available since 7 October 2015)


About CM1:

Helpful Information for New Users of CM1:

Other Information about CM1:

Testing and evaluation of CM1

Here are reports on some basic tests of the accuracy and capability of CM1. (Note: all of these tests have been completed, but I haven't had time to write up the results. I plan to have all of these posted online in the near future.)

Research Results

Peer-reviewed articles that use CM1: (Please contact George Bryan if you have something to add to this list.) Last updated: August 2016

Some recent conference papers that use CM1:

Honors and awards

(Please contact George Bryan if you have something to add to this list.)


Send comments and/or questions about this page to:

George H. Bryan
National Center for Atmospheric Research
3090 Center Green Drive
Boulder, CO 80301, USA
email: gbryan at ucar dot edu

Last updated: 7 October 2015