It's an inexorable process. A new day starts with the rising of the sun. The heat starts to beat down on your boat. The air molecules in the radar dome start to get excited as the temperature increases inside the dome. The air increases in volume. Slowly the higher pressure air starts to escape the dome until the temperature peaks. The sun is now setting, and the temperature inside the dome starts to cool. The pressure inside the dome drops correspondingly. Moist air from the outside now gets pulled into the dome. As the temperature continues to cool, the moisture inside the dome starts to condense on everything inside the dome.
