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Bulletin issued at 01:02 HKT 20/Jul/2018

At 1 a.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 94 per cent.

The air temperatures at other places were:

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

Between 11:45 p.m. and 0:45 a.m., the rainfall recorded in various regions were:

Islands District 0 to 5 mm;
Tai Po 0 to 3 mm;
Kwai Tsing 0 to 2 mm;
Central & Western District 0 to 1 mm;
Eastern District 0 to 1 mm;
Tsuen Wan 0 to 1 mm;
Southern District 0 to 1 mm;
Yuen Long 0 to 1 mm;
Sai Kung 0 to 1 mm;
Wan Chai 0 to 1 mm;
Sha Tin 0 to 1 mm;
Sham Shui Po 0 to 1 mm.


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


Climatological Information for 20 Jul

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 01:10 HKT 20/Jul/2018

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

The easterly airstream affecting the coast of Guangdong moderated gradually yesterday. Meanwhile, a broad trough of low pressure brought showers to the region. Locally, it was mainly cloudy with sunny periods and showers. More than 10 millimetres of rainfall were recorded over the urban areas and Lantau Island, and rainfall of around 40 millimetres or above were recorded over Cheung Chau and Lamma Island. The broad trough of low pressure is expected to bring showers to the northern part of the South China Sea in the next couple of days.

Besides, Tropical Cyclone Ampil intensified from a tropical depression into a tropical storm yesterday morning. At 11 p.m. last night, Ampil was centred about 620 kilometres southeast of Okinawa. It is forecast to move north-northwest at about 18 kilometres per hour towards the vicinity of the Ryukyu Islands.

Weather forecast for Hong Kong

Mainly cloudy with a few showers. Sunny periods during the day. Temperatures will range between 26 and 31 degrees. Moderate easterly winds, fresh offshore.

Outlook : Sunny periods and one or two showers over the weekend. Very hot on Saturday.


(The above forecast period is valid up to 23:59 HKT today, 20/07/2018; 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 19/Jul/2018

N0 WARNING.

GENERAL SITUATION AT 182100 UTC:
AN EASTERLY AIRSTREAM IS GENERALLY AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 191300 UTC:

HONG KONG= E 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. TEMP 27-31 C. =
KWANGTUNG= E TO SE 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 2 M, E 2 M. =
TAIWAN STRAIT= NE 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. =
BASHI= N TO NW 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 2-3 M, E 2 M. =
PRATAS= E TO SE 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 2-3 M. =
BALINTANG= W TO NW 5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 2-3 M, E 2 M. =
SCARBOROUGH= SW 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL SW 2-3 M. =
PARACEL= S TO SW 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL SW 2-3 M. =
TONKIN= S TO SE 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL E 2 M. =
DANANG= S TO SW 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 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.


  • Map showing the 10 forecast areas
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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 23:30 HKT 19/Jul/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 19 July 2018

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    A broad trough of low pressure is bringing unsettled weather to the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 4 to 5, occasionally force 6.
    Isolated showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    East to southeast force 4 to 5, occasionally force 6.
    Isolated showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    Easterly winds of force 4 to 5, becoming west to southwesterly winds of force 4 to 5. Isolated showers and thunderstorms.

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

    Waglan Island Wind east-southeast force 4

    Shantou Wind east-southeast force 2
      Visibility 30 Kilometres

    Dongsha Wind south force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind east-southeast force 5

    Macau Wind east-southeast force 3
      Visibility 23 Kilometres

    Xisha Wind southwest force 3
      Visibility 10 Kilometres

  • Explanation of Seas or Sea Waves
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 20/JUL/2018
    (Next update at 9:00-9:30 HKT 20/JUL/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN EASTERLY AIRSTREAM IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS. MEANWHILE, A BROAD TROUGH
     OF LOW PRESSURE IS BRINGING UNSETTLED WEATHER TO
     THE SOUTH CHINA COASTAL AREAS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  100/10
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  090/15                               26-33
   B.   2000 FT:  100/20                               22
   C.   5000 FT:  100/20                               19
   D.  10000 FT:  100/20                               12
   E.  18000 FT:  110/20                               MS1
   F.  24000 FT:  090/20                               MS12
   G.  30000 FT:  050/10                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH ISOLATED SQUALLY SHOWERS AND
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT  SCT 3000 FT. TEMPO FEW CB 1000 FT
      SCT 2500 FT BKN 5000 FT
   K. VISIBILITY    : 10 KM. TEMPO 4000 M IN SHOWERS. TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 12000 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE EASTERLY WINDS. 
     SUNNY PERIODS WITH ISOLATED 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.

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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 21:50 HKT on 19 Jul 18

    VHHK SIGMET 3 VALID 190955/191355 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1848 E11454 - N1724 E11324 - N1824 E11230 - N1912 E11148 - N1948 E11442 - N1848 E11454 TOP FL450 STNR NC= VHHK SIGMET 4 VALID 191355/191755 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1906 E11554 - N1642 E11400 - N1842 E11212 - N1930 E11306 - N1942 E11500 - N1906 E11554 TOP FL450 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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    Bulletin issued at 06:30 HKT 19/Jul/2018


    Tropical Cyclone Warning

    At 182100 UTC, Tropical Storm Son-Tinh (1809) with central pressure 994 hectopascals was centred within 60 nautical miles of one nine point two degrees north (19.2 N) one zero four point seven degrees east (104.7 E) and is forecast to move west-northwest at about 8 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 35 knots.

    Radius of over 33 knot winds 30 nautical miles.
    Radius of over 2 metre waves 120 nautical miles.

    No further warnings on this Tropical Storm will be issued by the Hong Kong Observatory unless it re-enters the Hong Kong area of responsibility.



    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 20/Jul/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     29.7 C
Minimum Air Temperature                     26.6 C
Grass Minimum Temperature                   25.9 C
Relative Humidity                        80 - 94 Percent
Rainfall                                    17.3 mm 
Total rainfall since 1st January           927.2 mm
Against an average of                     1327.3 mm

Other Stations                Min                  Max
King's Park                  26.3 C               30.0 C
Wong Chuk Hang               26.2 C               29.6 C
Ta Kwu Ling                  26.2 C               32.5 C
Lau Fau Shan                 25.9 C               31.6 C
Tai Po                       27.0 C               30.3 C
Sha Tin                      27.2 C               31.7 C
Tuen Mun                     25.9 C               31.6 C
Tseung Kwan O                26.6 C               29.5 C
Sai Kung                     27.1 C               30.1 C
Cheung Chau                  24.7 C               28.7 C
Chek Lap Kok                 26.7 C               31.8 C
Tsing Yi                     26.8 C               31.3 C
Shek Kong                    26.8 C               31.8 C
Tsuen Wan Ho Koon            25.3 C               30.2 C
Tsuen Wan Shing Mun Valley   26.5 C               31.0 C
Hong Kong Park               25.4 C               29.4 C
Shau Kei Wan                 25.4 C               29.8 C
Kowloon City                 25.9 C               30.2 C
Happy Valley                 26.7 C               29.5 C
Wong Tai Sin                 26.2 C               29.8 C
Stanley                      25.8 C               29.0 C
Kwun Tong                    26.5 C               29.6 C
Sham Shui Po                 26.5 C               31.0 C
Kai Tak Runway Park          26.5 C               29.5 C
Yuen Long Park               27.3 C               32.6 C
Tai Mei Tuk               26.2 C               31.1 C

Duration of sunshine (King's Park):              2.3 H
The mean UV index recorded at King's Park yesterday was 3,
the UV intensity was Moderate.
The maximum UV index for yesterday was 7.
 

Yesterday's (19 Jul 2018) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 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                           0.08
Tap Mun                             0.08
Kat O                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.11
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.08
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 19 Jul
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