Department of Earth Science |Northeastern Illinois University

INTRODUCTION TO EARTH SCIENCE
ESCI 121

Section 06
Fall 2009

Daily Objectives #27 (December 10, 2009)                                                                                                         Dr. Sanders

By the end of today's class, you should be able to do the following:

WEATHER, CONTINUED

w   Review:  Explain the meaning of air pressure / barometric pressure

w   Review:  Tell what makes the wind blow, and how winds are named (e.g. "west wind", "north wind", and so on).

w   Review:  Describe the rotation and vertical motion of winds about a high pressure center and a low pressure center.

w   Review:  Tell what kind of weather generally accompanies highs and lows.

w   Revisit:  Using a slip of paper with a circle to represent a HIGH or a LOW, draw arrows on the circles to indicate direction of the rotation.  Trace the circles on tracing paper, and place the tracing paper over weather maps to illustrate rotation of the HIGH and LOW systems.

Describe how the winds change in Chicago under the following situations:

A HIGH approaches Chicago, passes directly over it, and then moves on.
A LOW approaches Chicago, passes directly over it, and then moves on.
   
  A HIGH passes to the north of Chicago.
A LOW passes to the north of Chicago.
 
       A HIGH passes to the south of Chicago.
    A LOW passes to the south of Chicago.

w   Given a weather observation, what can you reasonably conclude?  See the attached worksheet! 

w
  Putting together all the data trends we have observed, particularly regarding air masses, fronts, highs,  lows, and winds, forecast the weather. 

w   Practice forecasting using today's weather map from the Chicago Tribune.

Department of Earth Science | Northeastern Illinois University

Copyright 2009 Laura L. Sanders.  Last updated December 10, 2009.