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Bulletin issued at 04:02 HKT 24/Aug/2018

At 4 a.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 88 per cent.

The air temperatures at other places were:

King's Park 26 degrees;
Wong Chuk Hang 25 degrees;
Ta Kwu Ling 24 degrees;
Lau Fau Shan 24 degrees;
Tai Po 25 degrees;
Sha Tin 26 degrees;
Tuen Mun 25 degrees;
Tseung Kwan O 25 degrees;
Sai Kung 25 degrees;
Cheung Chau 25 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 25 degrees;
Shek Kong 25 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 25 degrees;
Hong Kong Park 25 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 26 degrees;
Happy Valley 26 degrees;
Wong Tai Sin 25 degrees;
Stanley 26 degrees;
Kwun Tong 27 degrees;
Sham Shui Po 26 degrees;
Kai Tak Runway Park 27 degrees;
Yuen Long Park 25 degrees;
Tai Mei Tuk 25 degrees.

Here is the information on Tropical Depression at 3 a.m.:
Location: 24.1 degrees north, 120.6 degrees east.


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


Climatological Information for 24 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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

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Bulletin updated at 03:45 HKT 24/Aug/2018

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

Showers are affecting the coast of Guangdong and the northern part of the South China Sea.

At 2 a.m., the tropical depression near Taiwan was centred about 140 kilometres southwest of Taibei. It is forecast to be slow-moving and linger around Taiwan.

Weather forecast for today

Mainly cloudy with occasional showers and a few squally thunderstorms. Temperatures will range between 26 and 31 degrees. Sunny intervals in the afternoon. Light winds.

Outlook : Sunny intervals and a few showers in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 24/08/2018; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

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MARINE FORECAST
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Marine Forecast

Weather Information for the Marine Community

Bulletin issued at 21:00 HKT 23/Aug/2018

GALE WARNING AREAS: BASHI AND BALINTANG.

GENERAL SITUATION AT 230900 UTC:
FOR DETAILS ON THE TROPICAL DEPRESSION NEAR TAIWAN, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 231300 UTC:

HONG KONG= W 4. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. TEMP 26-31 C. =
KWANGTUNG= W TO SW 4-5, OCNL 6 IN E. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 2 M, UP TO 3 M IN E. SWELL SW UP TO 2 M. =
TAIWAN STRAIT= S TO SW 6-7, CYCLONIC 6-7 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 2 M, NE 2 M. =
BASHI= SW 6-7, OCNL 8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL SW 2 M. =
PRATAS= SW 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL SW 2 M. =
BALINTANG= SW 6-7, OCNL 8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL SW 2 M. =
SCARBOROUGH= SW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 2 M. =
PARACEL= SW 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S TO SW 2 M. =
TONKIN= S TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SW 2 M. =
DANANG= SW 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL S TO SW 2 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.


  • Map showing the 10 forecast areas
  • Tidal Information

    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 03:30 HKT 24/Aug/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 24 August 2018

    Warnings:
    Strong winds in Nan'ao.

    Weather Situation:
    Showers and thunderstorms are affecting the south China coastal waters.

    At 3 a.m., the tropical depression near Taiwan with maximum sustained winds of about 55 kilometres per hour near its centre was located near 24.1 degrees north, 120.6 degrees east. It is forecast to be slow-moving and linger around Taiwan.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    West force 4.
    Scattered squally showers and thunderstorms.
    Moderate seas.

    Nan'ao:
    West to southwest force 4 to 5, occasionally force 6.
    Frequent heavy squally showers and thunderstorms.
    Moderate to rough seas.

    Shanwei:
    West to southwest force 4 to 5.
    Scattered heavy squally showers and thunderstorms.
    Moderate seas.

    South of Hong Kong and Shangchuan Dao:
    West to southwest force 4, occasionally force 5.
    Scattered squally showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    West to southwesterly winds of force 4 to 5. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind west force 4
      Visibility 20 Kilometres

    Shantou Wind west-southwest force 1
      Visibility 18 Kilometres

    Huangmaozhou Wind south force 3

    Macau Wind south force 2
      Visibility 14 Kilometres

    Xisha Wind southwest force 4
      Visibility 11 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
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  • Visibility Readings in Hong Kong Waters
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 24/AUG/2018
    (Next update at 9:00-9:30 HKT 24/AUG/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     SHOWERS ARE AFFECTING THE COAST OF GUANGDONG AND
     THE NORTHERN PART OF THE SOUTH CHINA SEA.
     AT 11 P.M. LAST NIGHT, THE TROPICAL DEPRESSION
     NEAR TAIWAN WAS CENTRED AT 23.9 DEGREES NORTH,
     120.6 DEGREES EAST AND IS FORECAST TO BE
     SLOW-MOVING AND LINGER AROUND TAIWAN.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  250/5-10
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  270/10-15                            26-32
   B.   2000 FT:  300/10-15                            25
   C.   5000 FT:  320/10                               22
   D.  10000 FT:  330/10                               11
   E.  18000 FT:  040/10                               MS2
   F.  24000 FT:  060/10                               MS11
   G.  30000 FT:  080/10                               MS21
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS AND ISOLATED
      THUNDERSTORMS.  LOCALIZED MIST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1200 FT  SCT 3000 FT  BKN 10000 FT.  TEMPO
      FEW CB 1000 FT  SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 4000 M IN SHOWERS/MIST.  TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 10400 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT WINDS.  SUNNY INTERVALS WITH A FEW SHOWERS
     AND ISOLATED 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 02:32 HKT on 24 Aug 18

    VHHK SIGMET 4 VALID 231440/231840 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N2036 E11712 - N2142 E11336 - N2218 E11330 - N2400 E11730 - N2100 E11730 TOP FL480 STNR NC= VHHK SIGMET 5 VALID 231840/232240 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1742 E11448 - N2212 E11318 - N2354 E11718 - N2400 E11730 - N2100 E11730 TOP FL430 STNR NC=

    Please click here for more about the SIGMET

    Tropical Cyclone Warning
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    Tropical Cyclone Warning

    There is no tropical cyclone warning signal.

    For other tropical cyclone related information, please visit the World Meteorological Organization Web Site - Severe Weather Information Centre.

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    TROPICAL CYCLONE WARNING FOR SHIPPING
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    Tropical Cyclone Warning for Shipping

    Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
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    Severe Weather Information Centre

    Bulletin issued at 03:31 HKT 24/Aug/2018


    Tropical Cyclone Warning

    At 231800 UTC, the tropical depression near Taiwan with central pressure 994 hectopascals was centred within 60 nautical miles of two four point one degrees north (24.1 N) one two zero point five degrees east (120.5 E) and is forecast to be slow moving 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 241800 UTC
    Two five point two degrees north (25.2 N)
    One one nine point eight degrees east (119.8 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 251800 UTC
    Two five point four degrees north (25.4 N)
    One one seven point eight degrees east (117.8 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 261800 UTC
    Dissipated over land.



    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 24/Aug/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     30.9 C
Minimum Air Temperature                     24.6 C
Grass Minimum Temperature                   23.9 C
Relative Humidity                        75 - 96 Percent
Rainfall                                    24.9 mm 
Total rainfall since 1st January          1374.0 mm
Against an average of                     1812.9 mm

Other Stations                Min                  Max
King's Park                  24.1 C               31.0 C
Wong Chuk Hang               24.4 C               31.2 C
Ta Kwu Ling                  23.9 C               33.0 C
Lau Fau Shan                 23.6 C               31.1 C
Tai Po                       24.4 C               32.3 C
Sha Tin                      25.0 C               33.7 C
Tuen Mun                     24.1 C               31.1 C
Tseung Kwan O                23.8 C               32.3 C
Sai Kung                     25.2 C               32.5 C
Cheung Chau                  24.5 C               30.0 C
Chek Lap Kok                 24.7 C               32.3 C
Tsing Yi                     24.2 C               31.4 C
Shek Kong                    23.9 C               33.4 C
Tsuen Wan Ho Koon            23.1 C               30.4 C
Tsuen Wan Shing Mun Valley   24.0 C               31.6 C
Hong Kong Park               24.0 C               31.1 C
Shau Kei Wan                 23.8 C               33.2 C
Kowloon City                 23.6 C               32.6 C
Happy Valley                 24.8 C               33.4 C
Wong Tai Sin                 23.8 C               33.1 C
Stanley                      24.4 C               30.8 C
Kwun Tong                    24.2 C               32.7 C
Sham Shui Po                 24.4 C               32.4 C
Kai Tak Runway Park          24.4 C               32.2 C
Yuen Long Park               23.9 C               32.8 C
Tai Mei Tuk               24.1 C               32.2 C

Duration of sunshine (King's Park):              3.2 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 7.
 

Yesterday's (23 Aug 2018) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 to
0.15 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                           0.10
Tap Mun                             0.10
Kat O                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.11
Kwun Tong                           0.13
Sai Wan Ho                          0.09
King's Park                         0.15
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 23 Aug
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