If isopleth map if lines are close to each other then the change in the variable is
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Isopleths
The following is a list of all the important isopleths encountered in operational meteorology. An isopleth is a line or curve of equal values.
Constant Pressure Surface
Most analysis and model images are shown using a pressure surface. The most common are the 1000 mb, 850 mb, 700 mb, 500 mb, and 300 mb surfaces. Every location on the image has the same pressure, however, heights will vary (thus the contouring of height contours). Below is a listing of pressure surfaces and their approximate height above zero geopotential meters.
Isallobar / Height change contours
A line of equal pressure change. They are used to forecast the propagation of low and high pressure systems. Low pressure tends to develop toward regions of the greatest pressure falls (height falls). Heights and pressures fall due to the evacuation of mass in the upper levels of the atmosphere and the chilling of air within a vertical atmospheric column.
Isobar
A line of constant pressure. Isobars are found ONLY on surface charts. They most commonly connect lines of equal pressure in the units of millibars. High pressure isobars generally occurs with isobars above 1010 mb while low pressure isobars occur with lower than 1010 millibars. Isobars "kink" along fronts and otherwise have a smooth curved trajectory. Isobars represent the pressure at zero geopotential meters. This is done to compensate for elevation changes. Isobars of close proximity represent higher wind speeds than isobars of wide spacing. When isobars are "pack together", this represents an increase in the pressure gradient force and thus stronger winds. The pressure on an analysis chart in Colorado may be near 1028 mb on the chart when in reality the surface pressure is closer to 850 mb. This surface chart has isobars (solid lines).
Isodop
Contour of constant doppler velocity values.
Isodrosotherms
A line of equal dewpoint. They are contoured most often in the low levels of the atmosphere. Isodrosotherms can be used to locate frontal boundaries, regions of moist air or dry air advection, and mesoscale precipitation boundaries. The following image is an example of isodrosotherms (the colored lines). The highest dewpoints are often found bordering the Gulf of Mexico.
Answer:
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