Frost On Roof Above Freezing

Does your garage have a frosted roof and the rest of your home does not or vice versa.

Frost on roof above freezing.

1 initially the air and the car are at temperature 37 f and the dew point is 35. It forms frost on the inside top of the door and also where the door touches the freezer when closed. That is how we get a frost without a freeze. We had a chilly start to the day with frost in many countryside locations.

As it cools below 35 degrees water condenses on it. Have you ever wondered why frost can form on nights when the temperatures only fall to 36 or 37 degrees. A lack of frost can indicate that heat is leaking out through your attic space onto the roof and melting the frost. So when you open the door on a full freezer letting in warm.

Something i implied above but didn t say explicitly is that when frost forms on the roof the roof is below freezing. How can that be. We bought a sears kenmore frost free upright freezer model 26732 in jan 07. There is ample air movement around it.

Too little or too much food can lead to frost in the freezer. Ice at least at atmospheric pressure cannot form above the melting point of water 0 celsius. The phenomenon of water freezing on objects like the ground parked cars motorbikes etc is due to thermal inertia. Once food items freeze they help keep the air inside the freezer cold.

In other words the sequence might be as follows. Mon 06 oct 2008 19 38 20 gmt frost at 35 degrees. The plot below shows a 24 hour trace of the temperature measured at 0 5 meters above the ground in blue at 2 meters above the ground in red and at 3 meters above. In other words the sequence might be as follows.

Something i implied above but didn t say explicitly is that when frost forms on the roof the roof is below freezing. 2 the car roof cools radiatively. Frost is a thin layer of ice on a solid surface which forms from water vapor in an above freezing atmosphere coming in contact with a solid surface whose temperature is below freezing and resulting in a phase change from water vapor a gas to ice a solid as the water vapor reaches the freezing point in temperate climates it most commonly appears on surfaces near the ground as fragile. So the air can be above freezing and the surface of your car or the roof of your house can be colder than the air and colder than freezing causing a frost even though the air temperature is above freezing.

If the dew point is below freezing the water vapor condenses as ice freezing as frost. Look at the entirety of your roof is the frost melting unevenly and not due to the sun s heat. On a long cold spell these objects will cool down to below 0 celsius. The kentucky mesonet recently added some extra temperature sensors at varying heights that show just why this could occur.

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