Hurumanu: 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.  4 Cups 
2.   Pin
3.   4 straws
4.   Tape
5.   Pencil with an eraser on the top.

STEPS

1.   Take your straws, bind two together to make a longer straw, do that twice.
2.  When binded for extra security tape the binded part.
3.  Lay them perpendicular to each other to form a cross.
4. Bind the elongated straws together in a cross position.
5. Pin the where the two centers meet into the pencil.
6. Create small insitions in the cups and stick them into the straws in the same direction, either the opening facing right or left.

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 timekeeper 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.

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 sec	8
2.	10 sec	9
3.	10 sec	7
4.	10 sec	11

	Time Interval	Number of Spins
1.	1 min	48 spins
2.	1 min	54 spins
3.	1 min	42spins
4.	1 min	66 spins

• Can you make a statement connecting the number of spins of your anemometer and the speed of the wind? Mark one cup so when it spins you can count it for one minute. You can also blow the anemometer or turn on the electric fan so It spins easily also don't make your fan spins fast your anemometer will also break.

CONCLUSION:  

Every number of Beaufort can reach by the wind. Every Beaufort can cost climate change too.