Latest Message

(2021/01/16 11:30 HKT)

The "Astronomical, Geographic and Meteorological Events of 2020" election has concluded. Thank you for your support. A total of 141 votes were received this year, and the top three events are listed below:

• Rank #1: Tropical cyclone Higos impacted the Pearl River Estuary, leading to the issuance of the #9 and #10 Signal in Hong Kong and Macau, respectively (111 votes; 78.72%)
• Rank #2: The minimum temperature of 8.1 degrees on 31/12 amid a cold surge was the lowest in the year (89 votes; 63.12%)
• Rank #3: Tropical cyclone Nangka crossed the South China Sea, leading to the #8 Signal again in Hong Kong (86 votes; 60.99%)

Warning(s) in Force [Details] [Def]

Earthquake Info

+M 6.4 - 29 km WSW of Pocito, Argentina

Weather Details around Hong Kong [Details] [HKO link]

Tropical Cyclone Information [Details] [HKO link]

Real-time Weather Photos [Details] [HKO link]

The following photo shows the real-time view of Victoria Harbour, as viewed from Central towards the east.

Astronomical / Tidal Information [Details] [HKO link]

Info for 19/01/2021 (Tuesday):

Astro. Info				Tide
Sunrise	:	07:05		00:20	2.00 m
Sunset	:	18:03		07:28	0.81 m
Moonrise	:	11:14		15:16	1.57 m
Moonset	:	23:37		19:02	1.34 m

Jan 21, 05:02 HKT: First Quarter

Jan 21, 21:11 HKT: Moon Apogee: 404400 km

Jan 24, 09:59 HKT: Mercury Elongation: 18.6° E

Jan 24, 10:26 HKT: Saturn Conjunction

Jan 25, 05:47 HKT: Moon Ascending Node

Jan 26, 23:39 HKT: Moon North Dec.: 24.9° N

Weather at a Glance [Details] [HKO link]

Data as of 17:00 on 19/1/2021

• In Brief
• Detailed

16.5 C	56 %	1018.8 hPa
All measurements taken at Hong Kong Observatory

HKO	Temp.:	16.5 C
	RH.:	56 %
	Apparent Temp.:	16.5 C
	Dew Point:	7.7 C
	Temp. of today:	17.4 / 12.6 C (Range 4.8 C)
	Mean SLP.:	1018.8 hPa
King's Park	Wind:	12 km/h (E)
	UV:	0.5 (Low)
	Rain:	0.0 mm (past 15 min)

Upper-Level Weather Information [Details]

Data as of 08:00 HKT on 19/1/2021 - Level of instability:

Delta P Values

At 2021/01/19 14 HKT: [Explanation] [Values for the past 10 days]

Delta p(972) = -0.5
Delta p(S) = 8.5 (strong E wind at Waglan)

3-day Weather Forecast [Click for 9-day] [HKO link]

Data as of 16:30 HKT 19/Jan/2021

General Situation: An easterly airstream will affect the south China coast in the next couple of days. Meanwhile, a band of clouds will bring rainy weather to southern China. Under the influence of the northeast monsoon, the weather will be generally fine over Guangdong during the weekend and early next week. It will be cool in the morning and at night.

Date	20/1 (Wed)	21/1(Thu)	22/1(Fri)
Weather	Mainly cloudy. One or two light rain patches in the morning and at night.	Mainly cloudy with one or two rain patches.	Mainly cloudy. Sunny intervals during the day. One or two rain patches in the morning and at night.
Wind	E force 4 to 5, occasionally force 6 offshore at first.	E to NE force 4 to 5.	NE force 4.
Temp.	15 - 19 °C	17 - 20 °C	18 - 22 °C
R.H.	65 - 90 %	75 - 95 %	70 - 90 %

Extended Temperature Outlook [HKO link]

Maximum temperature:

Minimum temperature:

Weather Conditions in South China Sea [Details] [HKO link]

Satellite / Radar Images [Details]

Radar: 256 km range	Radar: 128 km range	Radar: 64 km range	Satellite: IR imagery*

* The Satellite imagery above is taken by Himawari-8 operated by the Japan Meteorological Agency (JMA).

Aviation Weather Observation Report [HKO link]

Data as of 17:00 HKT on 19 Jan 21

Original code: METAR VHHH 190900Z VRB02KT 9999 FEW035 SCT045 17/06 Q1018 BECMG 10010KT=

Wind	Visibility	Weather	Cloud Amount	Cloud Base	Temperature	Dew Point	Pressure (QNH)
2 knots direction variable	10 km or above	No significant weather	1 to 2 oktas 3 to 4 oktas	3500 feet 4500 feet	17 oC	6 oC	1018 hPa

Next Two Hours Change	Wind	Weather
Becoming	10 knots from 100 degrees (E)	No significant weather

Meteorological Calculation

A. Conversion between units Please select unit --------- Temperature --------- C     Celsius F     Fahrenheit K     Kelvin R     Rankine --------- Length --------- km     Kilometre mi     Statute Mile NM     Nautical Mile --     Degree of Latitude m     Metre ft     Foot --------- Speed --------- km/h     Kilometre per Hour m/s     Metre per Second mph     Statute Mile per Hour kt     Knot (Nautical Mile per Hour) --------- Direction --------- Degree(s) => Direction --------- Pressure --------- hPa/mb     Hectopascal/Millibar inHg     Inch of Mercury atm     Atmosphere mmHg     Torr

B. Calculation of distance between places on Earth Place 1:     Lat :   Long : Place 2:     Lat :   Long :

Current Partner Sites [Details]

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