How do you get notifications or setup alerts for when the market crashes or has a large drop like it did last week? I don't really know until after the fact and buying the dip (if I have the money) would be very beneficial

The only broker I havd is Charles Schwab, so I was just wondering how you guys get alerts when they are suddenly huge drops in the market. I never know when its happening in real time. Being able to know when there is a large dip will alllw me to do a decent sized lump sum if I have the money avaliable to invest.