CSWR Staff (2006). "Doppler On Wheels". CSWR.org. Center for Severe Weather Research (CSWR). Archived from the original on February 5, 2007. Retrieved December 29, 2006.
CRH-NOAA Staff (October 2, 2005). "Hallam Nebraska Tornado". CRH.NOAA.gov. Omaha, NE: CRH-NOAA Weather Forecast Office. Archived from the original on October 4, 2006. Retrieved September 8, 2006.
National Center for Atmospheric Research (2008). "Hail". University Corporation for Atmospheric Research. Archived from the original on May 27, 2010. Retrieved July 18, 2009.
National Center for Atmospheric Research (2008). "Hail". University Corporation for Atmospheric Research. Archived from the original on May 27, 2010. Retrieved July 18, 2009.
CSWR Staff (2006). "Doppler On Wheels". CSWR.org. Center for Severe Weather Research (CSWR). Archived from the original on February 5, 2007. Retrieved December 29, 2006.
CRH-NOAA Staff (October 2, 2005). "Hallam Nebraska Tornado". CRH.NOAA.gov. Omaha, NE: CRH-NOAA Weather Forecast Office. Archived from the original on October 4, 2006. Retrieved September 8, 2006.
UCAR Staff (August 1, 2008). "Tornadoes". UCAR.edu. Archived from the original on October 12, 2009. Retrieved August 3, 2009.