Enyedi, Angie (27 August 2010). "What are PoPs?". National Weather Service, Jacksonville, FL. Archived from the original on 10 June 2015. Retrieved 27 November 2018.
"Forecast Terms". National Weather Service, Binghamton, NY Weather Forecast Office. Retrieved 2015-06-07.
web.archive.org
Enyedi, Angie (27 August 2010). "What are PoPs?". National Weather Service, Jacksonville, FL. Archived from the original on 10 June 2015. Retrieved 27 November 2018.