AEN 461G.......NAME:______________________Date:__________

Lab. # 1. Drawing Isopleths, ETC.
There are many lines on weather maps. Lines of equal temperature are "isotherms", lines of equal air pressure are called "isobars", lines of equal height are called "isoheights" to name a few. Regardless of the type of line...the general name is called "isopleths"....lines of equal concentration....and there are some rules to drawing them. After completeing this lab, you should be able to:

- Draw lines of equal concentration.
- Locate regions of relatively high and low values of temperature and air pressure.
- Locate areas of greatest change (ie gradient).

The more contouring you do the better you will be at interpreting weather maps. 
In lab session you will be doing contouring on paper weather maps using a 
pencil.  A few guidelines to remember when doing the lab exercises: 
1) Prepare to contour

A. Search for continuity (time and space) on the weather map
B. Eliminate what appears to be faulty, or incorrect, data
C. Locate regions of high and low values
D. Review data to determine isopleth spacing
2) Drawing the map

A. Use a pencil !!
B. Draw smooth lines
C. Interpolate between given values to correctly place an isopleth
D. Isopleths cannot touch or cross
E. Isopleths cannot branch or fork
F. Be neat and accurate
G. Label the isopleths
3) Review your map

A. Do a gross check of isopleths for accuracy
B. If necessary, trace over pencil with final marker (be neat)
C. Check for proper labeling

To complete this lab, analyze the data fields as instructed, sign and turn in.

More on contours/isopleths




Map 1 , Map 2, Map 3 ,

Click here for all of the general rules of drawing contours.