Cloud formation: Bergeron-Findeisen theory (Icing) v.s Coalescence theory (Water droplet)
July 20, 2025
https://youtu.be/6WjU0kwu_ew?si=Kvf5LqleDUzpKo8b Cloud Formation
Cloud Formation
July 20, 2025
https://youtu.be/q87Ekar3emA?si=EN2zl3qUX1OmIcsh Read More https://www.britannica.com/video/process-cloud-formation-factors-surface-air-water/-203821 Cloud formation: Bergeron-Findeisen theory (Icing) v.s Coalescence theory (Water droplet) Cloud formation 夠竟係吸定放latent heat? Clouds 雲
Oktas – reporting the amount of cloud in the sky
July 20, 2025
https://worldweather.wmo.int/oktas.htm Oktas Definition Category 0 Sky clear Fine 1 1/8 of sky covered or less, but not zero Fine 2 2/8 of sky covered Fine 3 3/8 of sky covered Partly Cloudy 4 4/8 of sky covered Partly Cloudy 5 5/8 of sky covered Partly Cloudy 6 6/8 of sky covered Cloudy 7 7/8 of
How Does Autopilot Work? A Pilot Explains What It Can and Can’t Do
July 20, 2025
https://www.wsj.com/video/series/travel-guides/how-does-autopilot-work-a-pilot-explains-what-it-can-and-cant-do/1C1E2CD3-92E3-420F-927B-5A4026A3E412?mod=hp_featst_pos5
點解ATIS 要點Temperature and Dew Point?
July 20, 2025
今日打風溫書…簡接溫故知新~ 下面有個ATIS 實例…有T 28 /DP 26 要推算Cloud Base = T-DP * 400 = (28-26)*400 = 2* 400 = 800 feet AGL 再反推Relative Humidity (RH) = 100 – (T-D) *5 = 100 – (28-26) * 5 = 100 – 10 = 90% 呢兩條Rule of thumb 係work 既~
Calculation of Freezing Height
July 20, 2025
The Bradbury Rule Example: OAT 10 degree C ; DP 7 degree C Calculate Cloud Base T – DP * 400 = (10-7) * 400 = 1200 feet AGL Calculate Freezing layer DP / 1.8 * 1000 = 7/1.8 * 1000 = 3889 feet AGL Freezing height 1200 + 3889 = 5089 feet AGL This
How to find the Dew Point? How to find Relative Humidity (RH)?
July 20, 2025
How to find the Dew Point? RH = 100 – (T-D) x 5 Example: RH 83% ; Temp 12C, then 83 = 100 – (12-D) x 5 (83-100) / (-5)= 12-D D = 12 – (83-100) / (-5) D = 8.6 degree C Rightly, we can interpret the relative humidity (find the RH) from
Dew Point Application – Calculate Cloud Base
July 20, 2025
Degree C Let’s say the temperature is 25°C and the dew point is 15°C. Convergence Rate (CR) = 2.5°C Temperature Dew Point Spread (TDS) = T-DP = 25 – 15 = 10°C TDS ÷ CR = 10 / 2.5 = 4 Multiply by 1000 = 4 * 1000 = 4000 feet Therefore, the estimated cloud
Dew point, Dew Point Spread
July 20, 2025
What’s Dew Point? Dew point, given in degrees, is the temperature at which the air can hold no more moisture. When the temperature of the air is reduced to the dew point, the air is completely saturated and moisture begins to condense out of the air in the form of fog, dew, frost, clouds, rain,
ISA Deviation
July 20, 2025
Example: FL290 ; OAT -47 degree C ISA standard = 15 – (feet /1000) * 2 ISA Deviation = OAT – ISA standard FL 290 : 29,000 feet, so ISA standard @ FL 290 = 15- (29*2) = -43 degree C ISA deviation = -47 – -(43) = ISA-4 degree C https://youtu.be/_oWqu12Dm6M?si=eUYvJoTQD_EOKKl2
Thermodynamics: Radiation, Conduction, Convection & Advection
July 20, 2025
https://youtu.be/0vdxlgRKx1k?si=a80FzWfEp2fsKj2K What’s Solar insolation?
Tropopause
July 20, 2025
What’s Tropopause? https://youtu.be/jTCWSjhhXgc?si=9Zf8eVJgx6TKOXDs Tropopause height and its significance? https://youtu.be/ZfGVHCJSDsw?si=qaqwuN4DSlX6uyiu https://youtu.be/dRI5gYrJmvo?si=NHQo3NtST_5f-9ei More Reference: https://code7700.com/tropopause.htm
