Isobaric Charts

• First, recall that the tropospheric depth is proportional to the mean tropospheric temperature:

• As shown to the right -->> the 500 mb surface will be located at higher levels further south and at lower levels further north

• Hence, on an isobaric chart (e.g., 500mb) we plot isopleths of the height of the surface.

• Let's look at an example.....