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Bulletin issued at 21:02 HKT 18/May/2018

At 9 p.m. at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 77 per cent.

Please be reminded that:

The Very Hot Weather Warning is now in force. Very hot weather might cause adverse health effects. Members of the public should take care to avoid heatstroke.

The air temperatures at other places were:

King's Park 29 degrees;
Wong Chuk Hang 28 degrees;
Ta Kwu Ling 29 degrees;
Lau Fau Shan 28 degrees;
Tai Po 29 degrees;
Sha Tin 29 degrees;
Tuen Mun 29 degrees;
Tseung Kwan O 28 degrees;
Sai Kung 29 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 29 degrees;
Tsing Yi 28 degrees;
Shek Kong 29 degrees;
Tsuen Wan Ho Koon 28 degrees;
Tsuen Wan Shing Mun Valley 29 degrees;
Hong Kong Park 29 degrees;
Shau Kei Wan 28 degrees;
Kowloon City 29 degrees;
Happy Valley 29 degrees;
Wong Tai Sin 29 degrees;
Stanley 28 degrees;
Kwun Tong 29 degrees;
Sham Shui Po 29 degrees;
Kai Tak Runway Park 28 degrees;
Yuen Long Park 29 degrees;
Tai Mei Tuk 29 degrees.


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


Climatological Information for 18 May

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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UV Index Forecast |  Weather Information for South China Coastal Waters

Bulletin updated at 20:45 HKT 18/May/2018

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

An anticyclone aloft is bringing generally fine weather to the coast of southeastern China.

Weather forecast for tonight and tomorrow

Fine. The minimum temperature will be about 28 degrees tomorrow. Very hot during the day with a maximum temperature of around 33 degrees. Light to moderate southerly winds.

Outlook : Fine in the following couple of days and very hot during the day.


(The above forecast period is valid up to 23:59 HKT tomorrow, 19/05/2018; 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 18/May/2018

N0 WARNING.

GENERAL SITUATION AT 180900 UTC:
A SOUTHERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 181300 UTC:

HONG KONG= S 4-5. FINE. SEA UP TO 2 M. TEMP 28-33 C. =
KWANGTUNG= S TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
TAIWAN STRAIT= S TO SW 4-5, OCNL 6. FINE. SEA UP TO 3 M. SWELL S UP TO 2 M. =
BASHI= S TO SW 4-5, OCNL 6. FINE. SEA UP TO 3 M. SWELL S UP TO 2 M. =
PRATAS= S TO SW 4-5. FINE. SEA UP TO 2 M. SWELL S UP TO 2 M. =
BALINTANG= S 4-5. FINE. SEA UP TO 2 M. SWELL S UP TO 2 M. =
SCARBOROUGH= S TO SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL S UP TO 2 M. =
PARACEL= S 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
TONKIN= S 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. =
DANANG= S 4-5. ISOL SHOWERS AND TS. SEA UP TO 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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    9-day Weather Forecast | UV Index Forecast | Weather Information for Fishermen

    Bulletin issued at 19:30 HKT 18/May/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 18 May 2018

    Weather Situation:
    A southerly airstream is affecting the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South force 4 to 5.
    Moderate seas.

    Nan'ao and Shanwei:
    South to southwest force 4 to 5.
    Moderate seas.

    South of Hong Kong:
    South force 4 to 5.
    Moderate seas.

    Shangchuan Dao:
    South force 4 to 5.
    Isolated showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    South to southwesterly winds of force 4 to 5.

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

    Waglan Island Wind south-southwest force 4
      Visibility 29 Kilometres

    Shantou Wind south force 2
      Visibility 30 Kilometres

    Huangmaozhou Wind south-southwest force 3

    Macau Wind south force 3
      Visibility 25 Kilometres

    Xisha Wind south force 2
      Visibility 30 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
  • Descriptive Terms of Wind Speeds
  • Visibility Readings in Hong Kong Waters
  • Map showing forecast areas
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 18/MAY/2018
    (Next update at 01:30 HKT 19/MAY/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A SOUTHERLY AIRSTREAM IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  200/5-10                             32-27
   B.   2000 FT:  220/10-15                            24
   C.   5000 FT:  240/10-15                            21
   D.  10000 FT:  220/10                               12
   E.  18000 FT:  180/10                               MS4
   F.  24000 FT:  280/10                               MS16
   G.  30000 FT:  350/10                               MS29
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE.  ISOLATED SHOWERS AT FIRST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT.
   K. VISIBILITY    : 10 KM.  TEMPO 4000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 16000 FT      10 DEG. C LEVEL(S) : 11200 FT
   M. TURBULENCE    : NIL
   N. SEA STATE     : 0.5-1.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT TO MODERATE SOUTHERLY WINDS.  MAINLY FINE.=

    ===================================================================
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 10:55 HKT on 17 May 18

    VHHK SIGMET 1 VALID 170300/170700 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2000 E11554 - N1936 E11618 - N1800 E11506 - N1948 E11506 - N2012 E11530 - N2000 E11554 TOP FL400 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

    There is no tropical cyclone warning for shipping*.




    *Tropical cyclone warnings for shipping are issued by the Hong Kong Observatory for tropical cyclones located within the area bounded by 105E and 125E , 10N and 30N.




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

    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 18/May/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     33.1 C
Minimum Air Temperature                     27.4 C
Grass Minimum Temperature                   25.0 C
Relative Humidity                        60 - 83 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January           170.7 mm
Against an average of                      482.1 mm

Other Stations                Min                  Max
King's Park                  26.6 C               32.5 C
Wong Chuk Hang               26.5 C               30.2 C
Ta Kwu Ling                  23.3 C               34.2 C
Lau Fau Shan                 25.6 C               33.6 C
Tai Po                       25.8 C               33.9 C
Sha Tin                      25.4 C               32.8 C
Tuen Mun                     25.3 C               33.4 C
Tseung Kwan O                24.6 C               32.9 C
Sai Kung                     25.4 C               33.6 C
Cheung Chau                  25.4 C               33.3 C
Chek Lap Kok                 27.5 C               34.0 C
Tsing Yi                     26.4 C               32.1 C
Shek Kong                    25.8 C               34.1 C
Tsuen Wan Ho Koon            25.5 C               31.3 C
Tsuen Wan Shing Mun Valley   26.6 C               31.3 C
Hong Kong Park               27.0 C               31.7 C
Shau Kei Wan                 26.4 C               31.6 C
Kowloon City                 26.4 C               33.5 C
Happy Valley                 27.1 C               31.6 C
Wong Tai Sin                 26.8 C               32.7 C
Stanley                      26.8 C               31.1 C
Kwun Tong                    26.4 C               32.6 C
Sham Shui Po                 26.5 C               31.4 C
Kai Tak Runway Park          26.6 C               32.2 C
Yuen Long Park               25.0 C               33.5 C
Tai Mei Tuk               25.2 C               34.4 C

Duration of sunshine (King's Park):              9.5 H
The mean UV index recorded at King's Park yesterday was 5,
the UV intensity was Moderate.
The maximum UV index for yesterday was 11.
Sea surface temperature (Waglan Island):        25.9 C 

Yesterday's (17 May 2018) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 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                           0.08
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                           0.11
Sai Wan Ho                          0.08
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 17 May
     2003copy right image | Important notices | Privacy policy Last revision date: <18 May 2018> 

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