Category: Meteorology


Ref AIP VHHH Part 1 GEN – GEN 3.5 METEOROLOGICAL SERVICES 3  Meteorological Observations and Reports 3.1 Weather Observers are on duty H24 at the AMO and I-AMO to make routine meteorological observations and to issue reports at half-hourly intervals. Reports of routine observations are issued as local routine report for dissemination at the aerodrome and as METAR for dissemination Read More

一次搞懂香港,澳洲, 美國的Cloud base / Cloud ceiling

話說上堂老師教Cloud Base 同 Cloud Ceiling 既分別 METAR / TAF 報既cloud 都係AGL? 同埋提我地一個好重要既Concept: METAR 同 TAF 報既Cloud information 都是AGL! 到底邊到有講…都真係搵左幾耐!   Hong Kong AIP HONG KONG – GEN 1.7 DIFFERENCES FROM ICAO STANDARDS, RECOMMENDED PRACTICES AND PROCEDURES “Cloud ceiling” in relation to an aerodrome means the vertical distance from the elevation of the aerodrome to the Read More

What is global circulation?

Knowledge from this clip: Global Circullation is one of the drivers for climate and phenomenon: Jet Steam Previling wind Engergy (heat) from sun reachs the earth by radiation Earth itself is an irregularly shaped ellipsoid Energy is much more concentrated near the equator Earth is tilted, sun light cannot reach the poles at all time In Read More


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Monsoon 合集: 一次了解多個地方既季候風

Monsoon: a seasonal prevailing wind in the region. Monsoons are large-scale wind systems caused by differences in the temperatures of land and sea over the seasons. HONG KONG 香港 Also Reference:Strong Monsoon Signal|Hong Kong Observatory(HKO)|Details of Warnings Key knowledge from this clip: Winter in Hong Kong : North to East (North-East) monsoon Summer in Hong Read More

What’s El Niño and La Niña? 厄爾尼諾? 拉尼娜? 聖嬰?

生字 learn from these videos: Extreme natural events Bush fire 山火 Heat waves Drought 乾旱 Floods Cyclones coral bleaching (珊瑚白化)   Reference:El Niño Southern Oscillation (ENSO)   Swing (shifts/ changes) between phases El Nino Neutral La Nina Notes: can divided into more phases, but in general, there are three “status”. Knowledge from this clip: Effect Read More

How are tornadoes formed?

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Landfall to Hong Kong East or West? 東登 v.s 西登?

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What’s Tropical Cyclone (Typhoon)?

Tropical cyclones is one of the natural hazard for aviation. How do we call them depending on the region. According to WMO (World Meteorological Organization): [Ref Tropical cyclone (] A tropical cyclone is a rapidly rotating storm that begins over tropical oceans, and they can vary in speed, size, and intensity. Tropical cyclones are the Read More

What’s Foehn effect 焚風效應?

Ref Foehn effect – Met Office The foehn effect describes the change from wet and cold conditions one side of a mountain, to warmer and drier conditions on the other (leeward) side.     Read More

What’s Lee side?

Ref Windward and leeward – Wikipedia The term “windward” has roots in both Low German and Old English. The word “lee“, which means a place without wind. Windward is upwind from the point of reference, i.e., towards the direction from which the wind is coming; Leeward is downwind from the point of reference, i.e., along the direction towards Read More

How the air pressure work in our environment?

By change, I stumble upon a series of televsion show, which use animation to explain Meteorology in a easy way. Great! Read More

Cloud Base v.s Cloud Ceiling

A cloud base refers to the lowest visible part of the clouds over the station. A cloud ceiling refers to the distance between the ground or water and the base of the lowest layer of clouds, which must form a cloud cover that blankets more than half of the sky below 20,000 feet.   Read More – Read More

Temperature Inversion 逆溫層

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What’s Sea Breeze and Land Breeze?

NWS JetStream – The Sea Breeze ( The sea breeze circulation is composed of two opposing flows; one at the surface (called the sea breeze) and one aloft (which is a return flow). These two flows are a result of the difference in air density between the land and sea caused by the sun’s heating. The sun Read More

Summer Solstice v.s Winter Solstice (夏至 v.s 冬至); Tropic of Cancer v.s Tropic of Capricorn

Tropic of Cancer v.s Tropic of Capricorn   夏至   冬至   (2:22)   Read More

Sunrise, Sunset and Rainbow, Northern lights (aurora borealis)

Why sunsets organge? Ans: Scattering effect!   How are rainbows formed? – Met Office How Are Rainbows Formed? | Royal Meteorological Society (   Northern lights – Met Office Read More

Clear Air Turbulence (CAT)

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What’s Doppler Radar?

  Dual-polarization Doppler weather radar at Tate’s Cairn Read More

What’s Virga?

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