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

<P>Lab. # 1. Drawing Isopleths, ETC.

<br>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:


<P>- Draw lines of equal concentration.
<br>- Locate regions of relatively high and low values of temperature and air pressure.
<br>- Locate areas of greatest change (ie gradient).
<pre><B>GENERAL RULES OF CONTOURING:
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</B>
</PRE>

<!--
<P>Rules for drawing lines of equal value:

<p><font color=blue>1. Always draw an isopleth so that values greater than the value being drawn
are consistently on one side of the isopleth and lower values are on the other side.

<p>2. When positioning isopleths, assume a steady change between neighboring stations.
Ex. a temperature isopleth of 60 degrees would be drawn between 59 and 62 about one-third
the way from 59.

<p>3. Adjacent isopleths tend to look alike. Ex. The isopleth for air pressure are called
isobars and will generally parallel the curves of its neighbors because horizontal changes in air 
pressure from place to place are usually gradual.

<p>4. Continue drawing an isopleth until it reaches the boundary of the plotted data
or "closes" to form a loop by making its way to its starting point.

<p>5. Isopleths NEVER stop or end within a data field, and they never fork, touch or
cross one another.

<p>6. Isopleths cannot be skipped if their values fall within the range of values reported
on the map. Isopleths must always appear in sequence; for example, there must always be
a 60 degree isopleth between the 50 degree isopleth and 70 degree isopleth.

<br>7. Smooth!

<br>8. Always label all isopleths.</font>
-->
<P><font color=red>To complete this lab, analyze the data fields as instructed, sign and turn in.</font>


<P><a href="http://faculty.icc.edu/easc111lab/labs/labe/pre_labe.htm">More on contours/isopleths</a>
<P><a href="https://www.youtube.com/watch?v=qtwgHYPtPmI">A</a>
<P><a href="https://www.youtube.com/watch?v=XtWlAwSAPNE">B</a>
<P><a href="https://www.youtube.com/watch?v=jw-0pfOG8TM">C</a>
<P><a href="/aen599/isopleth1.jpg">Map 1</a>

<a href="/aen599/isopleth2.jpg">,</a>



<a href="/aen599/isopleth3.jpg">Map 2</a>,

<a href="/aen599/Isotherms.png">Map 3</a>
<a href="/aen599/isopleth4.jpg">,</a>
<br>


<a href="/aen599/isopleth6.jpg">.</a>


<P>Click <a href="http://wwwagwx.ca.uky.edu/aen599/contouring.shtml#GENERAL RULES OF">here </a> for
all of the general rules of drawing contours.

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<a href="/aen599/isopleth_rules1.jpg">Rules for drawing Isobars--1</a>
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<a href="/aen599/isopleth_rules.jpg">Rules for drawing Isobars--2</a>
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