You’ll want to start setting this up fairly soon. Sell each client a preset schedule with a preproduced commercial that will run only under certain weather conditions. Good prospects include travel agents, and stores that sell snow-blowers, snow tires, 4WD vehicles, snowmobiles, wood stoves, kerosene heaters. The selling point is that the advertiser can be on the air immediately when snow or bad weather hits. Make sure it’s clear the conditions under which the schedule will go into effect, or agree on telephone authorization. Your sales people will need to stay on top of this, making sure the client gets on the air whenever appropriate.