Latest Message

(2023/09/26 21:20 HKT)

The review reports for tropical cyclones SAOLA and HAIKUI, which affected Hong Kong earlier this month, are now available here.

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

+Click to view very hot places

Tropical Cyclone Information [Details] [HKO link]

- Tropical Storm KOINU bulletin #2 (2023/09/30, 22:15 HKT)

Weather Details around Hong Kong [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 01/10/2023 (Sunday):

Astro. Info				Tide
Sunrise	:	06:14		03:59	0.78 m
Sunset	:	18:11		10:44	2.23 m
Moonrise	:	19:33		16:13	1.01 m
Moonset	:	07:51		22:51	2.30 m

Oct 01, 00:49 HKT: Moon Ascending Node

Oct 02, 11:16 HKT: Moon-Jupiter: 3.5° S

Oct 06, 04:31 HKT: Moon North Dec.: 28.3° N

Oct 06, 21:48 HKT: Last Quarter

Weather at a Glance [Details] [HKO link]

Data as of 13:40 on 1/10/2023

• In Brief
• Detailed

33.5 C	61 %	1009.2 hPa
All measurements taken at Hong Kong Observatory

HKO	Temp.:	33.5 C
	RH.:	61 %
	Apparent Temp.:	41.2 C (DANGER)
	Dew Point:	24.9 C
	Temp. of today:	33.7 / 28.0 C (Range 5.7 C)
	Mean SLP.:	1009.2 hPa
King's Park	Wind:	5 km/h (E)
	UV:	N/A
	Rain:	0.0 mm (past 15 min)

Upper-Level Weather Information [Details]

Data as of 08:00 HKT on 1/10/2023 - Level of instability:

Delta P Values

At 2023/10/01 11 HKT: [Explanation] [Values for the past 10 days]

Delta p(972) = 3.2
Delta p(S) = 6.3

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

Data as of 11:30 HKT 01/Oct/2023

General Situation: The northeast monsoon will affect the coast of Guangdong tomorrow. An anticyclone aloft will bring mainly fine weather to southern China in the next couple of days, but showers and thunderstorms triggered by high temperatures will affect the region. Meanwhile, Tropical Cyclone Koinu will move towards the vicinity of the Luzon Strait to the southern part of Taiwan and intensify gradually. It may then enter the northeastern part of the South China Sea. The weather will be windier with showers over the coast of Guangdong in the latter part of this week. Besides, another surge of the northeast monsoon will reach southern China in the middle and latter parts of this week. Under the influence of the northeast monsoon, there are uncertainties in Koinu’s subsequent movement and intensity.

Date	2/10 (Mon)	3/10(Tue)	4/10(Wed)
Weather	Sunny periods and one or two showers.	Mainly fine. Very hot during the day. Isolated showers later.	Sunny periods and a few showers. Very hot during the day.
Wind	E force 4 to 5, occasionally force 6 offshore.	E force 2 to 3, force 4 at first.	Light winds force 2, N to NW force 3 to 4 later.
Temp.	28 - 32 °C	28 - 33 °C	28 - 34 °C
R.H.	65 - 90 %	60 - 85 %	55 - 85 %

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 13:30 HKT on 01 Oct 23

Original code: METAR VHHH 010530Z 22009KT 9999 FEW018 SCT035 33/25 Q1009 NOSIG=

Wind	Visibility	Weather	Cloud Amount	Cloud Base	Temperature	Dew Point	Pressure (QNH)
9 knots from 220 degrees (SW)	10 km or above	No significant weather	1 to 2 oktas 3 to 4 oktas	1800 feet 3500 feet	33 oC	25 oC	1009 hPa

Next Two Hours Change

No Significant Change

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 :

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