With the barometer on the rise it means better weather is coming usually within 24 hours. The barometer measures air pressure and lighter air equals lighter pressure and good weather
The cause for the barometer to rise is the approach of a high pressure system. This will usually indicate that the weather will be clearing and there will be a lack of rain.
If there is a rise in barometric pressure this simply means there is an increase in air pressure. An increase usually signals us that the weather is clear or clearing.