In addition to looking at 500mb winds and dewpoints, meteorologists can also look at the height in the atmosphere at which the air pressure is exactly 500mb to track expected monsoon behavior. This usually occurs around 18,000 ft MSL, but that level varies depending on several factors - mainly what the average temperature is below 500mb. This is a very quick and convenient monitoring tool since at a glance it will tell us where the subtropical high is and how strong or weak it is. The higher the 500mb height, the stronger the monsoon high, and the hotter it is likely to be underneath. These charts can also be used to track disturbances rotating around the subtropical high, or if a disturbance is going to nudge the subtropical high into a different location. If a disturbance is detected at both 300mb and 500mb, it is likely a strong one and will be of particular concern.