CM1 Homepage


New version of CM1:

25 August 2017: An updated version of CM1 (cm1r19.3) has been released. Download the code here.

Using CM1 on cheyenne:

16 March 2017: To use CM1 on Cheyenne (the new supercomputer at NCAR), follow the same instructions as using CM1 on NCAR's Yellowstone. An additional flag ("-ffreestanding") needs to be added to the "CPP" setting in the Makefile. Here is the recommended Makefile settings for CM1 using the intel fortran compiler on cheyenne:

#  multiple processors, distributed memory (MPI), Intel compiler 
#      (eg, NCAR's yellowstone and cheyenne)
FC   = mpif90
OPTS = -I../include -O3 -xHost -ip -assume byterecl -fp-model precise -ftz
CPP  = cpp -C -P -traditional -Wno-invalid-pp-token -ffreestanding
DM   = -DMPI

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: cm1r19.3, available since 25 August 2017)


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: 4 August 2017

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: 25 August 2017