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Automatic Regional Weather Forecast in Hong Kong & Pearl River Delta Region

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Weather Information for South China Coastal Waters

Bulletin issued at 06:02 HKT 11/Aug/2018

At 6 a.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 94 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.
The Thunderstorm Warning has been issued. It will remain effective until 7:30 a.m. today. Occasional squally thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 27 degrees;
Wong Chuk Hang 27 degrees;
Ta Kwu Ling 26 degrees;
Lau Fau Shan 25 degrees;
Tai Po 27 degrees;
Sha Tin 27 degrees;
Tuen Mun 26 degrees;
Tseung Kwan O 26 degrees;
Sai Kung 28 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 27 degrees;
Tsing Yi 27 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 26 degrees;
Shau Kei Wan 28 degrees;
Kowloon City 27 degrees;
Happy Valley 28 degrees;
Wong Tai Sin 27 degrees;
Stanley 27 degrees;
Kwun Tong 27 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 28 degrees;
Yuen Long Park 26 degrees;
Tai Mei Tuk 26 degrees.

Between 4:45 and 5:45 a.m., lightning was detected within Lantau and New Territories West. The rainfall recorded in various regions were:

Islands District 0 to 19 mm;
North District 0 to 10 mm;
Tai Po 0 to 9 mm;
Tsuen Wan 0 to 5 mm;
Tuen Mun 0 to 3 mm;
Southern District 0 to 1 mm;
Yuen Long 0 to 1 mm.

Here is the information on Tropical Depression:
Location: 20.8 degrees north, 111.7 degrees east; Maximum sustained wind near its centre: 55 km/h.


Note: The data above is provisional. Only limited data validation has been carried out.


Climatological Information for 11 Aug


Local Weather Forecast
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Automatic Regional Weather Forecast in Hong Kong & Pearl River Delta Region

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Bulletin updated at 05:45 HKT 11/Aug/2018

Here is the latest weather bulletin issued by the Hong Kong Observatory.

Weather forecast for today

Cloudy with occasional squally showers and thunderstorms. The maximum temperature will be about 30 degrees. Moderate to fresh east to southeasterly winds, occasionally strong offshore and on high ground.

Outlook : There will be occasional squally showers and thunderstorms in the next couple of days.


(The above forecast period is valid up to 23:59 HKT today, 11/08/2018; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)



MARINE FORECAST
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Marine Forecast

Weather Information for the Marine Community

Bulletin issued at 21:00 HKT 10/Aug/2018

N0 WARNING.

GENERAL SITUATION AT 100900 UTC:
FOR DETAILS ON TROPICAL DEPRESSION OVER THE NORTHERN PART OF THE SOUTH CHINA SEA, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 101300 UTC:

HONG KONG= E TO SE 5-6. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S 2 M. TEMP 26-30 C. =
KWANGTUNG= CYCLONIC 6-7. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL S TO SW 2-3 M. =
TAIWAN STRAIT= S 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL S 2 M. =
BASHI= W TO SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2-3 M. =
PRATAS= S TO SW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 2-3 M. =
BALINTANG= W TO SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2-3 M. =
SCARBOROUGH= SW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 2-3 M. =
PARACEL= SW 6-7. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL S TO SW 2-3 M. =
TONKIN= W TO NW 5-6. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M. =
DANANG= W TO SW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL S 2-3 M. =
NNNN
Abbreviations:
KT, VRB, SLW, FRQ - knot, variable, slow, frequent STNR, QSTNR, C - stationary, quasi-stationary, degrees celsius WKN, INTSF, INTST, NC - weaken, intensify, intensity, no change LGT, ISOL, SCT, OCNL - light, isolated, scattered, occasional CLD, DZ, TS - cloudy, drizzle, thunderstorm

The date and time are specified by a 6-digit number DDHHMM. DD stands for the day of month, HH represents the hour while MM indicates the minute in UTC.



SOUTH CHINA COASTAL WATERS
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South China Coastal Waters

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Bulletin issued at 05:30 HKT 11/Aug/2018

Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 11 August 2018

Warnings:
Strong winds in all areas.

Weather Situation:
At 5 a.m., the tropical depression over the northern part of the South China Sea with maximum sustained winds of about 55 kilometres per hour near its centre was located near 20.8 degrees north, 111.6 degrees east. It is forecast to move northeast or north-northeast slowly, lingering around the seas off the coast of western Guangdong.

Area forecasts for the next 24 hours

Hong Kong Adjacent Waters:
East to southeast force 5 to 6.
Occasional heavy squally showers and thunderstorms.
Rough seas.

Nan'ao and Shanwei:
South force 5 to 6.
Scattered squally showers and thunderstorms.
Moderate to rough seas.

South of Hong Kong:
South force 6 to 7.
Occasional heavy squally showers and thunderstorms.
Rough seas.

Shangchuan Dao:
Cyclonic force 6 to 7.
Frequent heavy squally showers and thunderstorms.
Rough seas.

Outlook for the next 48 hours
South to southwesterly winds of force 7 to 8, becoming force 5 to 6 later. Occasional squally showers and thunderstorms.

Latest reports from south China coastal weather stations
--------------------------------------------------------

Waglan Island Wind east-southeast force 4
  Visibility 14 Kilometres

Shantou Wind east-northeast force 1
  Visibility 30 Kilometres

Huangmaozhou Wind south force 7

Macau Wind east force 3
  Visibility 7 Kilometres

Xisha Wind southwest force 5
  Visibility 10 Kilometres


WEATHER FORECAST FOR LOCAL AVIATION
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Weather Forecast for Local Aviation

Bulletin issued at 01:30 HKT 11/AUG/2018
(Next update at 9:00-9:30 HKT 11/AUG/2018)
I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
     CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 11 P.M. LAST NIGHT, THE TROPICAL DEPRESSION
     OVER THE NORTHERN PART OF THE SOUTH CHINA SEA
     WAS LOCATED NEAR 20.4 DEGREES NORTH, 111.4
     DEGREES EAST. IT IS FORECAST TO MOVE NORTHEAST
     OR NORTH-NORTHEAST SLOWLY, LINGERING AROUND THE
     SEAS OFF THE COAST OF WESTERN GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  120/15-20
                  TEMPO VRB/25G35 IN TS
       OFFSHORE:  140/20-25, OCNL 30                   26-29
   B.   2000 FT:  150/20-25, OCNL 30G40                23
   C.   5000 FT:  160/20-25                            19
   D.  10000 FT:  160/25                               12
   E.  18000 FT:  150/15                               MS3
   F.  24000 FT:  200/15                               MS12
   G.  30000 FT:  150/5-10                             MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH ISOLATED SQUALLY SHOWERS AND
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 800 FT  SCT 2000 FT  BKN 5000 FT. TEMPO FEW
      CB 700 FT  SCT 1500 FT  BKN 4000 FT.
   K. VISIBILITY    : 9 KM.  TEMPO 3000 M IN SHOWERS.  TEMPO 1500 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11400 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     FRESH TO OCCASIONALLY STRONG SOUTHEASTERLY
     WINDS, STRONG OFFSHORE AND ON HIGH GROUND.
     CLOUDY WITH ISOLATED SQUALLY SHOWERS AND
     THUNDERSTORMS.=
===================================================================
Note: The forecast could be updated before the next issue time 
whenever there is newly expected occurrence or non-occurrence 
of significant weather as described below which may be hazardous 
to aircraft within 100-km radius of Hong Kong:

(a) Change of the tropical cyclone category
(b) Strong, Gale, Storm, and Hurricane force winds
(c) Thunderstorm/CBs
(d) Severe gusts
(e) Severe turbulence
(f) Significant low stratus
(g) Fog or thick haze/sandstorm/duststorm 
    causing significant reduction of visibility
(h) Volcanic ash
(i) Radioactive cloud
===================================================================
Aviation Weather Observation and Forecast Information for Hong Kong International Airport
To know more about clouds, please see Commonly observed clouds in Hong Kong.


sigmet
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Significant Weather Information (SIGMET)

The Airport Meteorological Office is responsible for monitoring hazardous weather and phenomena in the atmosphere that may affect the safety of aircraft operations within a designated airspace over the northern part of the South China Sea. Weather forecasters at the Airport Meteorological Office issues SIGMET information when hazardous weather and phenomena in the atmosphere such as thunderstorms, tropical cyclones, turbulence, icing occur or are expected to occur in the airspace.

The latest significant weather information
issued by the Hong Kong Observatory at 04:50 HKT on 11 Aug 18

VHHK SIGMET 5 VALID 101650/102050 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2224 E11642 - N1836 E11218 - N1930 E11130 - N2124 E11130 - N2242 E11424 - N2224 E11642 TOP FL430 STNR NC= VHHK SIGMET 6 VALID 102050/110050 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2136 E11606 - N1800 E11248 - N1930 E11130 - N2124 E11130 - N2242 E11424 - N2136 E11606 TOP FL450 STNR NC=

Please click here for more about the SIGMET


TROPICAL CYCLONE WARNING Skip to main content
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Tropical Cyclone Warnings

Bulletin issued at 05:45 HKT 11/Aug/2018

Tropical Cyclone Warning Bulletin

Here is the latest Tropical Cyclone Warning Bulletin issued by the Hong Kong Observatory.

The Standby Signal, No. 1 is in force.

This means that a tropical cyclone now centred within about 800 kilometres of Hong Kong may affect us.

At 6 a.m., the tropical depression over the northern part of the South China Sea was estimated to be about 310 kilometres west-southwest of Hong Kong (near 20.8 degrees north 111.7 degrees east) and is forecast to move northeast or north-northeast slowly, lingering around the seas off the coast of western Guangdong.

Last revision date: <11 Aug 2018> 

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Last revision date: <11 Aug 2018> 

TROPICAL CYCLONE WARNING FOR SHIPPING
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Tropical Cyclone Warning for Shipping

Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
Current Weather |  Local Weather Forecast |  9-day Weather Forecast
South China Coastal Waters |  Marine Forecast
Severe Weather Information Centre

Bulletin issued at 06:30 HKT 11/Aug/2018


Tropical Cyclone Warning

At 102100 UTC, the tropical depression over the northern part of South China Sea with central pressure 994 hectopascals was centred within 90 nautical miles of two zero point eight degrees north (20.8 N) one one one point six degrees east (111.6 E) and is forecast to move northeast or north-northeast slowly for the next 24 hours.

Maximum winds near the centre are estimated to be 30 knots.

Radius of over 2 metre waves 120 nautical miles.

Forecast position and intensity at 112100 UTC
Two one point one degrees north (21.1 N)
One one two point zero degrees east (112.0 E)
Maximum winds 30 knots.

Forecast position and intensity at 122100 UTC
Two one point two degrees north (21.2 N)
One one one point eight degrees east (111.8 E)
Maximum winds 35 knots.

Forecast position and intensity at 132100 UTC
Two one point one degrees north (21.1 N)
One one zero point two degrees east (110.2 E)
Maximum winds 30 knots.

Forecast position and intensity at 142100 UTC
Two zero point three degrees north (20.3 N)
One zero seven point six degrees east (107.6 E)
Maximum winds 25 knots.

Forecast position and intensity at 152100 UTC
One nine point seven degrees north (19.7 N)
One zero six point two degrees east (106.2 E)
Maximum winds 25 knots.




The Hong Kong Observatory's tropical cyclone warnings for shipping are issued about one and a half hours after the time of observation. They incorporate additional information derived from surface and upper-air data and may therefore be slightly different from the real-time satellite or radar-based positions given in the hourly bulletins for public.

While the forecast positions and track indicate the most likely future path of the tropical cyclone, they may deviate from the actual path taken by the storm.

Tropical Cyclone Track

YESTERDAY'S WEATHER AND RADIATION LEVEL Skip to main content
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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 11/Aug/2018
HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:
------------------------------------------------------

Hong Kong Observatory
Maximum Air Temperature                     29.5 C
Minimum Air Temperature                     26.0 C
Grass Minimum Temperature                   25.7 C
Relative Humidity                        79 - 97 Percent
Rainfall                                    47.9 mm 
Total rainfall since 1st January          1037.6 mm
Against an average of                     1603.7 mm

Other Stations                Min                  Max
King's Park                  25.5 C               29.1 C
Wong Chuk Hang               25.2 C               29.0 C
Ta Kwu Ling                  25.5 C               30.9 C
Lau Fau Shan                 24.8 C               29.2 C
Tai Po                       25.7 C               29.2 C
Sha Tin                      25.7 C               30.0 C
Tuen Mun                     25.0 C               29.4 C
Tseung Kwan O                24.9 C               29.1 C
Sai Kung                     25.6 C               29.5 C
Cheung Chau                  24.8 C               28.5 C
Chek Lap Kok                 25.6 C               30.5 C
Tsing Yi                     25.5 C               30.5 C
Tsuen Wan Ho Koon            24.5 C               27.6 C
Tsuen Wan Shing Mun Valley   25.0 C               29.1 C
Hong Kong Park               24.9 C               29.0 C
Shau Kei Wan                 24.3 C               28.7 C
Kowloon City                 25.2 C               29.2 C
Happy Valley                 25.7 C               30.1 C
Wong Tai Sin                 25.5 C               29.6 C
Stanley                      25.1 C               28.9 C
Kwun Tong                    25.1 C               29.2 C
Sham Shui Po                 25.6 C               30.1 C
Kai Tak Runway Park          25.3 C               29.4 C
Yuen Long Park               25.3 C               30.2 C
Tai Mei Tuk               25.1 C               30.1 C

Duration of sunshine (King's Park):              0.6 H
The mean UV index recorded at King's Park yesterday was 2,
the UV intensity was Low.
The maximum UV index for yesterday was 6.
 

Yesterday's (10 Aug 2018) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 to
0.14 microsievert per hour.  These are within the normal
range of fluctuation of the background radiation level in
Hong Kong (see Note). The average dose rates measured at the
radiation monitoring stations over various parts of the
territory were as follows :

Station                     Yesterday's average
                            (microsievert/hour)
Ping Chau                           0.09
Tap Mun                             0.09
Kat O                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.13
Sai Wan Ho                          0.09
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.14

Note
  1. From readings taken at various locations in Hong Kong in the past, the hourly mean ambient gamma radiation dose rate may vary between 0.06 and 0.3 microsievert per hour. (1 microsievert = 0.000001 sievert = 0.001 millisievert)
  2. Temporal variations are generally caused by changes in meteorological conditions such as rainfall, wind and barometric pressure.
  3. Spatial variations are generally caused by differences in the radioactive content of local rock and soil.
  4. The data displayed is provisional. Only limited data validation has been carried out.
Climatological Information for 10 Aug
Last revision date: <11 Aug 2018> 

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