Here's a simple barometer any one can make outta a jar and an old glass pop bottle. Just make sure the neck of the pop bottle doesn't reach the bottom of the jar, the size of the jar mouth determines this, btw. Just add some food coloring to the water and there ya go. As can be seen in the enclosed pic, my area is in a high pressure phase as the colored water is over two inches up in the pop bottle. Have fun!!