When hazardous weather conditions might threaten operations, Weather Master™ Software users can take advantage of the Alarm Notifications feature. Upper and/or lower alarms can be set on any or all measured and calculated parameters. Notification options include audible, e-mail, and relay control to activate equipment such as pumps, fans or lights. The optional Relay Controller connects to the computer with a USB cable. When an alarm condition is met, the selected relay will close momentarily and a popup window will be displayed on the computer. The Relay Controller activates a secondary latch relay with a user selectable timer to control the equipment. WeatherMaster Software can be used with all weather stations from Columbia Weather Systems.