It then moved inland and merged with a low-pressure system around Toronto on the 20th.

Naming a high-pressure system costs $385, while low-pressure systems, which are more common, go for $256.

However, the continuous rainfall for about 30 hours was perhaps the most significant feature produced by the low-pressure system.

Ohio was on the warm sector of the low-pressure system.

Operating pressure valves are supposed to be closed to protect the low-pressure system.

This threat passed when rain shower moved through the California area because of a low-pressure system off the coast.

The low-pressure system moved slowly toward land, limiting the system's development.

However, it is already a low-pressure system, hence the name "depression".

These developed into high- and low-pressure systems that moved the jet stream far to the north.

The storm was part of a large low-pressure system that crept up from the southern states.