¥Weather maps at upper levels are analyzed on isobaric (constant pressure) surfaces.
¥ (Isobaric surfaces are used for mathematical reasons
that are too complex to explain in this course!)
¥Isobaric maps provide the same information as constant height maps, such as:
¥Low
heights on isobaric surfaces correspond to low pressures on constant height
surfaces!
¥Cold
temps on isobaric surfaces correspond to cold temperatures on constant height surfaces!