There are a ton of places on the web that offer weather data for public consumption, but not all of them allow us, a private company, to freely use and re-distribute their data/maps/images/etc.
Here is a list of the weather vendors that we work with, have made agreements to use and redistribute data, and how to properly cite them in posts:
CIPS Analogs – Courtesy: CIPS Analogs at Saint Louis University
CIRA – Courtesy: RAMMB / CIRA
College of DuPage – Courtesy: College of DuPage Meteorology
Meteomatics – No citation needed at this time
Penn State – Courtesy: psu.edu
Pivotal Weather – Courtesy: Pivotal Weather
PolarWx.com – Courtesy: PolarWx.com
QuadWeather – Courtesy: QuadWeather
StormVista Weather Models – Courtesy: StormVista
Tropical Tidbits – Courtesy: Tropical Tidbits
TwisterData.com – Courtesy: TwisterData
UCAR – Courtesy: UCAR
Unidata – No citation needed at this time
University of Wisconsin – Courtesy: CIMMS & University of Wisconsin
WeatherNerds – Courtesy: WeatherNerds
Any and all governmental outlets, NWS, SPC, CPC, etc are also free to use. Simply cite them as the root URL. So, for example, weather.gov, spc.noaa.gov, cpc.ncep.noaa.gov.

