Have you ever looked at a weather map and thought, "I see a lot of H's and L's, but what do those actually mean?" Let's look at what pressure systems mean for our forecast. WHAS11 News Weather Page: https://www.whas11.com/weather Follow WHAS 11 on Social: Facebook: / whas11 Twitter: / whas11 Instagram: / whas11 Subscribe to WHAS 11 for exclusive content: http://www.youtube.com/c/WHAS11News?s... Visit Site: https://www.whas11.com/