How do baseball stadiums know when sever weather is approaching the ball park?

How do Baseball Stadiums know when sever weather is approaching the park? And how dose the Stadium Staff know when a tornado warning is issiued? Please let me know thank you.|||At most fields they have a radio or tv. When a chance of rain is issued the know the week ahead from watching the news. When my little brother plays and it starts to sprinkle rain they come on the intercom and usually tells what is going on. Hope this helps :)|||Probably radar from weather.com or some other weather website.|||they look at the weather chanell wow|||TV, Radio, Internet. The same way everyone gets their weather reports.