Hurumanu - Weather
Weather and Climate Change
Measuring weather.
Wind
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
- Pencil
- Tape
- pin
- cups (4)
- Straws (4)
STEPS
- Put the straws into a cross
- Tape the straws together
- Poke holes into the cups
- Put the straws into 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
- Mount the anemometer in a place that has full access to the wind from all directions.
- 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.
- 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 seconds | 11/3 |
2. | 10 seconds | 11/2 |
3. | 10 seconds | 41/14 |
4. | 10 seconds | 41/14 |
- Can you make a statement connecting the number of spins of your anemometer and the speed of the wind?
CONCLUSION:
Due to the calm wind weather, we had to use our mouth to get the anemometer to move around.
As you can see up in that chart some of them did not last for that long.
After a while, the wind picked up so we could use the wind to get it moving and it worked well you can see in the chart that the natural wind got it moving a lot more.
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