1 Choose a station with a Forecast license activated and wet/dry bulb sensor.
2 Click on the Extreme Weather Monitoring icon on the left side of FieldClimate.
3 The default time period is set to 2 days, but options are available for 1 to 30 days. 
4 Use the ? on the far right to provide a description of the Extreme Weather Monitoring operation.
5 Use the Device Settings to set the temperature alert thresholds (SMS and Web) for wet & dry bulb temperature and air temperature. 
6 The Graph includes by default:
• 48h past measured data of air temperature, wet & dry bulb temperature.
• 48h site specific forecast of air temperature and wet bulb temperature updated frequently with the latest data from your station, satellite and radar.
Wet & Dry bulb temperature for frost protection
• The Dry Bulb temperature, usually referred to as “air temperature“
• Wet Bulb temperature is always between the dry bulb and dew point temperature and is the lowest temperature to which air can be cooled by the evaporation of water into the air at a constant pressure. It is always important to remember that plants can be cooled to temperatures lower than the air temperature by radiation or evaporative losses from plant surfaces, particularly during clear nights with low humidity. This is why Wet Bulb temperature is used to predict frost potential.
Sprinklers should be started before wet bulb temperature drops below 0°C (32°F): • set the minimum threshold of wet bulb temperature in FieldClimate at +1°C (34°F) depending on the crop’s different phenological phases and critical damage temperature chosen. If the wet-bulb temperature is below 0°C (32°F), then cold damage can result from the use of the sprinkler system. 
Notifications
• Warning horizontal lines are shown on the chart, once the user has set the thresholds specific to its needs under Settings -> SMS Warnings/Notifications: blue line (Warning SMS) and green line (Notification).
• Arrows: represent the thresholds defined by the user under SMS or notifications pages. - Arrows down = ‘warning at MIN’ or ‘below’ - Arrows up = ‘warning at MAX’ or ‘above’