Many maps use a feature called isolines, lines that connect points that have equal value. For example, contour maps use isolines to connect areas with the same elevation. In meteorology, the study of
weather, isolines are used to represent air pressure and wind speed. This assignment includes isohyets,
which are isolines used to connect areas with similar amounts of rainfall.
There are several simple rules for maps with isolines:
1) Isolines connect points that have the same value.
2) Isolines cannot cross or touch.
3) The numerical distance between lines is called the interval, and on each map, the interval is the
same between all lines.
4) An isoline represents the difference between higher and lower values.
5) Isolines show the amount of change over the distance between them. If the isolines are far apart,
the change is gradual. If the lines are close together, the change is more prominent.
In addition to isolines, meteorologists collect weather data and observe trends and patterns to predict
what will happen in the future. The data meteorologists collect include precipitation, wind speed, and
temperature. These data are also useful in determining what to pack for a vacation!
Step 1: Prepare for the project.
a) Read through the guide before you begin so you know the expectations for this project.
b) If there is anything that is not clear to you, be sure to ask your teacher.
Step 2: Study the weather map, and answer the questions that follow.
a) Look over the weather map located at the end of this document.
b) Answer the questions that follow. Your answers do not need to be full sentences.
Step 3: Examine the weather data for Alexandria, Virginia.
a) Review Data Set A at the end of this document.
b) Answer the questions that follow. Your answers do not need to be full sentences.
Interpreting Weather Maps and Data
Step 4: Examine the weather data for Albany, New York.
a) Review Data Set B at the end of this document.
b) Answer the questions that follow. Your answers do not need to be full sentences.
Step 5: Evaluate your project using this checklist.
 Did you analyze the maps and graphs carefully to answer the questions?
 Did you answer all the questions?
 Did you review your answers?
 Did you write your name on your worksheet?
Step 6: Revise and submit your project.
a) If you were unable to check off all of the requirements on the checklist, go back and make
sure that your project is complete. Save your project before submitting it.
b) Submit your student answer sheet to your teacher or through the virtual classroom.
c) Congratulations! You have completed your project