They Watch for what noboby wants to see A sunny day turns gray as dark clouds build in the west. The air becomes still and feels heavy. The gray turns to a deep slate blue color and the winds pick up.
Leaves spin through the air.
You turn on the radio. Sure enough - a tornado watch has been posted. You go on about your business, occasionally stealing a glance to the west as the dark clouds bear down. Nah, there won't be a tornado, you say to yourself. If there is, somebody will see it.