Can anyone explain Wet Bulb vs. Dry Bulb temp in relation to natural and man made snow? ?

To specifically answer your question regarding the difference between dry bulb and wet bulb.

Dry bulb is simply the temperature you would get by placing a thermometer outside and getting the air temperature.

Wet bulb is very different. To obtain this a meteorologist takes a thermometer wrapped in, typically, a water soaked "cloth" (gauze) then slung around in the air until the moisture evaporates off and the temperature drops to it's lowest point due to evaporational cooling from the water evaporating much like off of your skin in the summertime from perspiration. The difference between the dry bulb and wet bulb temperature is actually called the "wet bulb depression". This is commonly used for assessing the potential for the atmosphere to cool to the point that rain may/could change over to snow.

Hope this helps!

Natural Wet Bulb Temperature

The wet and dry bulb thermometer is used to find the dew point and has nothing to do with the freezing point of the water.

I have also a problem to understand "man-made snow." Do you refer to snow canons that are used on the skiing slopes? Although they prefer cold weather, they work too just about the freezing point because the release of pressurized water cools it down by adiabatic effect. This is the same that happens in your fridge where a compressed gas is released through a nozzle.

The difference between the temperature of the wet and dry bulb is called the spread. The less it is, the closer to dew point or 100 percent relative temperature it is.

Natural snow can happen even if the temperature is over freezing point. But if the ground is warm, the snow will not stay.

The interesting thing is that, in order to freeze, water needs to give away energy in form of heat. The opposite is also true; when melting, ice gives heat energy.

You can observe this if you have a thermometer very near the ground in the winter. If the temperature sinks, it will stop at 32 F (0 C) then go down again. The same happens when the air temperature rises from below to above freezing point. The plotted temperature near the ground will show a plateau phase when at 32 F.

I live in Norway and observe that a lot.

Haha, light bulbs.