Download - Wind Speed
Wind
Wind Speed
CreditsPg. 3,11 Images harrythecat.comPage 5, 6 Images 1-6, 10, 12: <p><a href="http://www.fg- a.com/animations.htm">Free Gifs and Animations</a></p> Images 7-8: afg.com 9 images.oldhouseweb.com Image11: fpc.dos.state.fl.us
It is hard to believethat the wind that blows
gently enough to refresh you on a warm day
can also blow so ferociously that it destroys
everything in its path.
Wind speedis measured by
an instrument called ananemometer.
www.thunderheadtech.com
wings.avkids.com
Wind speedcan be estimated by using the
Beaufort Scale.
Force 0 Calm 1 1
Force 1 Light air 3 5
Force 2 Light Breeze 7 11
Force 3 Gentle Breeze 11 18
Force 4 Moderate Breeze 19 30
Force 5 Fresh Breeze 24 39
mph kph
Force 6 Strong Breeze 31 50
Force 7 Near Gale 38 61 Force 8 Gale 46 74
Force 9 Strong Gale 54 87
Force 10 Storm 63 102
Force 11 Violent Storm 73 117
Force 12 Hurricane 74 120
Beaufort Scale (continued)
mph kph
++
Wind movesfrom
high pressure areasto
low pressure areas.
H L
Wind blows fasteras the
difference in temperature increases
between two areas of pressure.
96
96 60
75
96 75
96 60
96 - 75 = 21 96 - 60 = 36
The wind blows faster in the second scenario because there is a greater difference in temperature there (36 ) than in the first scenario (21 ).
High Pressure Low Pressure
56
70
67
30 19
45
1624
32
73
H L
a.
b.
c.
d.
e.
For scenarios a-e, calculate the differences in temperature as air moves from high to low pressure systems. Then put blue letters a-e in order from fastest to slowest winds. Use the scrap paper to help you.
a
b
c
d
e
Temp.Difference 70 45 67 32 30
19 73 56 24 16
fast slowTap the starto check your answers.
Highpressure systems
usually bringfair, calm weather.
Lowpressure systems
often bringunpleasant, windy weather.
High winds can be dangerous. Can you match the wind storms below with their descriptions?
Wind that spinsin the shape of a funnel
Powerful wind and rainstorm that starts as atropical depression
Heavy snowstormwith high winds
Blizzard HurricaneTornado
Things to Review:
Learn more at:
Assessment Print-out link
http://www.fi.edu/weatherED/
http://www.weather.com/glossary
Instruments that measure wind speed
What effects wind speed and direction
Typical weather for high and low pressure systems
Three major wind storms
56
70
67
30 19
45
1624
32
73
H L
a.
b.
c.
d.
e.
For scenarios a-e, calculate the differences in temperature as air moves from high to low pressure systems. Then put blue letters a-e in order from fastest to slowest winds. Use the scrap paper to help you.
ab cd e
Temp.Difference
70 45 67 32 30
19 73 56 24 16
fast slow
25
8
17
11
35
Go back.
Move ahead.
High winds can be dangerous. Can you match the wind storms below with their descriptions?
Wind that spinsin the shape of a funnel
Powerful wind and rainstorm that starts as atropical depression
Heavy snowstormwith high winds Blizzard
Hurricane
Tornado
Wri
tten
Assessm
en
t
Name - Date -
What instrument measures wind speed accurately? ________________
Wind blows ________________ as the difference in temperature ________________ between two areas of pressure. [faster/slower, increases/decreases]
Complete the following:
Wind moves from _______ pressure areas to _______ pressure areas. [high/low]
A _______ pressure system is likely to bring unpleasant, windy weather. [high/low]
In which scenario would there be less wind as the temperature changes? ____ [A/B/C]
Low Pressure
43
26
35
High Pressure
53
59
68
A
B
C
Scenario