The barometer doesn’t seem to be working correctly. I had both Weather Watcher and Weather Watcher Live running. Weather Watcher showed it as being 29.71 and fair while Weather Watcher Live showed it as 29.76 and rain.
I think Weather Watcher was accurate because it wasn’t raining, hadn’t rained in several days, and the only precipitation in the forecast was for the chance of light snow the next day.
The barometer is more-or-less used to show short-term weather predictions – rather than the current conditions. Check out the following link for details:
http://www.ehow.com/about_4605088_what-does-barometer-measure.html