Science Hurumanu

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 direction of wind smoke drift, but not by wind vanes.	Light
2	6-12	40	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 loose 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. Straws (x4) 
2.   Pencil
3. Pin  
4.   Cups (x4)
5.   Tape 

STEPS

1.   getting into groups
2.   get materials
3.   Make the straws into a x shape
4.   Put a pin through the middle of the x shape 
5.   Connect the pin in the pencil and put tape on top of the pin in the middle.
6.   Put a hole in the cups
7.   Put the straws through the cups

Once you have made an anemometer we are going to record the wind speed.

Group size: 5

You will need:

Anemometer (above) 

Roles:

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

1. Mount the anemometer in a place that has full access to the wind from all directions.
2. When the time keeper says "Go", the counter in each group will count how many times the marked cup passes them in one minute and write it down.
3. If possible, repeat the above step four (4) times and record the average number of spins on the chart.

• 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.	10s	1 1/3
2.	10s	1 1/2
3.	10s	4 1/4
4.	10s	4 1/4

• Can you make a statement connecting the number of spins of your anemometer and the speed of the wind? 
• 
  

CONCLUSION:

For the 2 first try they were slower then what they were when we done them outside I think it is because once we got them going by breathing in to the cups the wind carried them on. Once we did it outside it went around 4 and 1/4 in 10 seconds.I think if i was holding the anemometer and blowing in it at the same time it would have gone around a few more times inside. If i was holding it while outside it would have gone round more.