If tomorrow's temperature is higher than 30°C, turn on water tank pump to water the garden
When you're using this Applet, it's best to set a time everyday when the WeMo will just turn off. This way you can be sure your garden is getting just enough water when it's going to need it. This is best used with water pumps that can be set to "on" so when WeMo is activated, the pump automatically starts. Ideally disable this rule if your tank is empty (not necessary if you are running this on a hard line water system).