CD-ROMs tend to be relatively expensive, but can hold as much as 600 megabytes of data.  Prices may be outdated, so be sure to inquire from the provider for current prices.  Prices for some discs are not known.  Some discs are provided with driving software.  Most of the software is for IBM-PC or compatible systems, but some is available for the Macintosh, and, increasingly, for Unix systems.

Some of these listings are not for CD-ROMs, but are for floppies or
tapes.  These are listed here, rather than in the section on data available on other media, because they have been prepared as a package.  For non-prepackaged data requests, see the data centers listed in the FAQ section Meteorology FAQ Part 3/7: Sources of research data.

Commercial sources are flagged as such.  Inclusion of a commercial
source in this listing does not imply endorsement.