https://www.nationalgeographic.org/encyclopedia/air-mass/
https://usatoday30.usatoday.com/weather/tg/wamsorce/wamsorce.htm
https://research.utep.edu/Default.aspx?tabid=45023
https://www.phschool.com/atschool/phsciexp/active_art/weather_fronts/
https://www.atmos.illinois.edu/weather/tree/viewer.pl?launch/sfcslp
https://www.atmos.illinois.edu/weather/tree/viewer.pl?launch/irslp
https://www.atmos.illinois.edu/weather/tree/viewer.pl?launch/sfctmp
https://www.wunderground.com/maps/radar/current