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Ok so I want to make sure that I'm understanding this correctly:

If your dewpoint depression lowers, then there is a smaller difference between the temperature and dewpoint and therefore the air cools.

But I don't really understand how if the air becomes cooler then the relative humidity increases?

Not quite. The Dewpoint is the temperature that the air would have to reach in order to lose its ability to hold any moisture (100% humidity). So, if the dewpoint is the same as the temperature, then that air has 100% reletive humididty. If the dewpoint is much lower then the temperature, then the humididty is low.
I really hope that made sense

i have a question
what does it mean on the rules about water and its states and properties as related to the weather
what shud you study for that?

i just took a met test for regionals yesterday.

we didnt do well, but thats besides the point...

it was a well made test. pretty challenging too. it had everything from hurricanes, air pressure, fronts, air masses, three cell model, surface weather maps, vernal/autumnal equinox, summer/winter solstice, greenhouse gasses and a buch of other stuff...

Can someone please explain upper level lows? I've read about them in several places but I'm still not completely understanding them...

Upper level lows are the same as troughs (height contours bending strongly to the south). It is the upper level extension of a surface low pressure center, which is why troughs are also called upper level lows. Troughs are typically preceded by stormy weather and cold air at the surface.

http://ww2010.atmos.uiuc.edu/(Gh)/guide ... /trgh.rxml

Sorry for all the questions but could you also explain troughs? I understand that they are a depression in the atmosphere but I'm not really making the connection between them and upper level lows....

Sorry, but it seems I'm having a mental block on this one subject.
As stated before, I'm not of full understanding of the difference between SLP and millibars.
On a meteogram, it displays air pressure in SLP. How would I convert that to inches in millibars?

What exactly are we supposed to know or should know for the sunsets, green flash, etc.?