Hands-On, Minds-On Meteorology
| Programming | Operation
The Wind Vector Diagram program allows the user to look at how the
balance of forces change the lowest 1km of the atmosphere. Forces are
represented on a vector diagram.
click for whole shot
The primary objective of the Wind Vector Diagram program to give the
student a visual interpretation of how friction influences wind direction
No outstanding theory. When a slider is moved or a button is pressed,
functions that calculated the forces are initiated.
- Geostrophic wind = 25 m/s to the east.
- Surface wind = 10 m/s also to the east
- Pressure Gradient Force = constant at the value opposite the Coriolis
Force when there is no friction.
- Friction always in the direction opposite of real wind (not truly
the case -- see Bluestein: Synoptic Dynamic Meteorology in Midlatitudes
Volume 1: Principles of Kinematics and Dynamics.)
(Pressure gradient force's magnitude is constant, as is Geostrophic
Running the Program
- Click the link for Wind Vector.
- Change altitude above earth's surface with slider bar.
- Change surface friction with slider bar.
- Adjust hemisphere with the radio buttons for "Hemisphere": "north"
- Vectors are defined on the graphic:
- orange = pressure gradient force
- blue = Coriolis force
- red = friction force
- white = Total wind (resultant wind)
- open white arrow = geostrophic wind
Department of Atmospheric Sciences
University of Illinois at Urbana Champaign
Created by Dan Bramer: Last Modified 07/27/2004
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