→Subscribe for new videos every day! https://www.yout→“partly cloudy” and “mostly sunny,” you’re not alone. Established by the National Weather Service (NWS) according to a loose set of rules, the criteria used to describe different elements of your forecast can be pretty vague. Want the text version?: http://www.todayifoundout.com/index.php/2015/06/determines-party-cloudy-mostly-sunny-weather-terms/ Sources: http://www.weather.gov/media/pah/ServiceGuide/A-forecast.pdf http://www.dtic.mil/dtic/tr/fulltext/u2/a226892.pdf http://www.nws.noaa.gov/om/winter/windchill.shtml http://forecast.weather.gov/glossary.php?word=SUSTAINED%20WIND https://www.osha.gov/SLTC/heatillness/heat_index/pdfs/all_in_one.pdf http://www.srh.noaa.gov/ama/?n=heatindex