Never ever stay parked just because they are forecasting rain. I have seen days here it was 80% chance rain and it didn't rain a drop until late afternoon. If you stay home every time rain is in the forecast, you will lose money! Work until it rains and then make the call. Remember, 50% chance of rain means 50% of the coverage area. That means 50% of your coverage area may NOT get rain. Think glass half full!