Upper-air DiFax archive
Storm Research and Consulting maintains an archive of upper-air charts from the National Weather Service. These black-and-white charts were originally broadcast over DIFAX and distributed to the NWS Forecast Offices across the United States. The NWS terminated production of these charts in early 2017. Similar charts are still available from the Environment Canada.
NCEP and Environment Canada DiFax archive at Storm Research
Additional sources of DiFax charts
Updated: September 2019