Wind - Measuring weather

Weather and Climate Change 

Extreme weather

Measuring weather.

Wind

Beaufort Wind Scale

Beaufort Force	Wind Speed (KPH)	Spins	Indicators	Terms Used in NWS Forecasts
0	0-2	0	Calm; smoke rises vertically.	Calm
1	2-5	10	Shown by the direction of wind smoke drift, but not by wind vanes.	Light
2	6-12	40	The wind felt on face, leaves rustle; ordinary vanes moved by wind.	Light
3	13-20	80	Leaves and small twigs in constant motion; wind extends light flag.	Gentle
4	21-29	130	Raises dust and lose paper; small branches are moved.	Moderate
5	30-39	190	Small trees in leaf begin to sway; crested wavelets form on inland waters.	Fresh
6	40-50	250	Large branches in motion; whistling heard in telephone wires; umbrellas used with difficulty.	Strong
7	51-61	320	Whole trees in motion; inconvenience felt walking against the wind.	Strong
8	62-74	390	Breaks twigs off trees; generally impedes progress.	Gale
9	75-87	470	Slight structural damage.	Gale
10	88-101	550	Seldom experienced inland; trees uprooted; considerable structural damage occurs.	Whole gale
11	102-116	640	Very rarely experienced inland; accompanied by widespread damage.	Whole gale
12	117 or more	730+	Very rarely experienced; accompanied by widespread damage.	Hurricane

Wind speed - Making an anemometer.

MATERIALS

1. x4 cups 
2. x4 straws  
3. tape  
4. pin  
5. pencil  

STEPS

1.  Get your materials
2.  Put one whole in each side of all your cups. 
3. After that put the straws threw the holes that you made.
4. And then put the pins threw the straws and also make a cross then put the pin in threw the straws into the pencil.
5. And finally your done and now you can record you times and see how much km per hour you get.

Group size: 3

You will need:

Anemometer (above) 

Roles:

• Timekeeper
• Counter
• Recorder
• Anemometer Manager
• Wind generator

FINDINGS

• Record how many times it spins using the table below.

You will need to create the wind yourself by blowing. Get 4 different wind speeds by blowing.

You will need to time them and count the number of spins.

	Time Interval	Number of Spins
1.	10 seconds	All 10
2.	10	S 29
3.	10	M 19
4.	10	C 41

• Can you make a statement connecting the number of spins of your anemometer and the speed of the wind? 
• The one done under the heat pump got 29 spins which is 6-7 km per hour which isn't very fast but can blow dust around. But then when it was really windy and stormy it had 41 spins which is 12 km per hour which is faster then under the heat pump.

CONCLUSION:

That when it is windy it is stronger wind then usual because the wind is much stronger then standing under the heat pump. But the weakest was when we blew it and it only did 10 spins in ten seconds because my breath was running out when I blew it with my mouth and I was also getting a bit light headed.