idea

Take observations twice a day in a weather diary to observe changes^[8].

• Temperature
• Clouds
• Wind
• Humidity (approx % and rain)

  Wind

Surface wind is observed on the following aspects:

• Wind direction is reported by where the wind is coming from.
  • Direction can be found with compass^[2], using a map as a reference, or using the sun^[3].
  • Methods to find what way the wind is falling: drop grass or leaves, and see what direction the wind takes them. In urban area, building can cause swirls, so use tall objects in open areas to make observations.
• Wind force is evaluated using the beaufort scale^[4].

Winds aloft (high winds) can have a different direction^[5]. They can be observed looking at clouds. Sometimes the shape of the clouds can also indicate the direction of the wind.

Temperature

Temperature perception is impacted by moisture and wind^[5]. It's best to use controlled environment shielded from the wind to guess the air temperature. Temperature can be guessed by uncovering hands and forearm, and perceiving temperature over a few minutes. An exercise to develop that perception is to make a prediction of the temperature and compare to a thermometer.

Humidity

A technique similar as using a hygrometer can be used to guess humidity. Moist one arm (e.g. lick it!), and not the other, then windmill them around. Note the difference in sensation of cooling between both arms. Do that away from wind.

Clouds

Look not only for clouds but also to the coverage^[8]. When coverage is low, other observations are required.

![[Pasted image 20240615174248.png]]

See Cloud taxonomy

Pressure

When pressure moves to low, this means a storm is coming. Some people can feel pressure: headache or arthritis acting up when a storm is coming

links

Physical processes in weather systems

references

[1]: Weather diary template:
202406110353-weather--Printable_Weather_Diary_Week_1.pdf 202406110354-weather--Printable_Weather_Diary_Weeks_2-4.pdf

[2]: 202406120231-weather--WEATH_V1_1_Weather_Observations_Wind_direction_rc_sl.txtBe careful when using a compass, that the true north is not the magnetic north. On phones, same issue applies.

[3]: Sun rises east and sets west at the summer solstice. During boreal (north) summer, it raises north of due east. During winter, it raises south of east.

![[Pasted image 20240611193445.png]]

[4]: Beaufort scale:

![[Pasted image 20240611193930.png]]

[5]: 202406120237-WEATH_V1_2_Weather_Observations_Temperature_humidity_wrap_rc_sl.txt

[6]: Sling psychrometer is an instrument that has two thermometer, one with moist fabric and one without. It is slinged vigorously around a lever, the moisture evaporates from the fabric and cools the second thermometer. The lower the humidity, the more cooling, and the larger the difference in temperature. Using a table can then tell humidity.

![[Pasted image 20240611194704.png]] [7]: 202406120251-weather--WEATH_V1_3_Weather_Observations_Wrap_rc_sl.txt

[8]: 202406160026-weather--WEATH_V1_3_Weather_Observations_Wrap_rc_sl.txt

![[Pasted image 20240615173121.png]]

Cloud in a bottle

Clouds are hyper-saturated air, with droplets suspended on small particles.