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Bulletin issued at 09:02 HKT 20/May/2018

At 9 a.m. at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 73 per cent.
During the past hour the mean UV Index recorded at King's Park was 3. The intensity of UV radiation was moderate.

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 30 degrees;
Wong Chuk Hang 29 degrees;
Ta Kwu Ling 30 degrees;
Lau Fau Shan 29 degrees;
Tai Po 31 degrees;
Sha Tin 31 degrees;
Tuen Mun 31 degrees;
Tseung Kwan O 30 degrees;
Sai Kung 32 degrees;
Cheung Chau 29 degrees;
Chek Lap Kok 31 degrees;
Tsing Yi 30 degrees;
Shek Kong 31 degrees;
Tsuen Wan Ho Koon 28 degrees;
Tsuen Wan Shing Mun Valley 30 degrees;
Hong Kong Park 29 degrees;
Shau Kei Wan 30 degrees;
Kowloon City 30 degrees;
Happy Valley 31 degrees;
Wong Tai Sin 30 degrees;
Stanley 29 degrees;
Kwun Tong 30 degrees;
Sham Shui Po 30 degrees;
Kai Tak Runway Park 31 degrees;
Yuen Long Park 31 degrees;
Tai Mei Tuk 32 degrees.

Between midnight and 9 a.m. the minimum temperature was 27.8 degrees Celsius at the Hong Kong Observatory.


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


Climatological Information for 20 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

Current Weather | Regional Temperature Forecast in HK |  9-day Weather Forecast
UV Index Forecast |  Weather Information for South China Coastal Waters

Bulletin updated at 08:45 HKT 20/May/2018

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

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

Weather forecast for today

It will be fine. Very hot during the day with a maximum temperature of about 33 degrees in the urban areas, and a couple of degrees higher in the New Territories. Light to moderate southwesterly winds.

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


(The above forecast period is valid up to 23:59 HKT today, 20/05/2018; 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 09:00 HKT 20/May/2018

N0 WARNING.

GENERAL SITUATION AT 192100 UTC:
A SOUTHERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 200100 UTC:

HONG KONG= S TO SW 4. FINE. TEMP 33-28 C. =
KWANGTUNG= S 4-5. FINE. SEA UP TO 2 M. =
TAIWAN STRAIT= S 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
BASHI= SE 4-5. FINE. SEA UP TO 2 M. =
PRATAS= S 4-5. FINE. SEA UP TO 2 M. =
BALINTANG= SE 4-5. FINE. SEA UP TO 2 M. =
SCARBOROUGH= S TO SE 4-5. ISOL SHOWERS AND TS. SEA 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. SEA UP TO 3 M. =
DANANG= S 4-5. ISOL SHOWERS. 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

    Current Weather | Local Weather Forecast | Regional Temperature Forecast in HK
    9-day Weather Forecast | UV Index Forecast | Weather Information for Fishermen

    Bulletin issued at 09:30 HKT 20/May/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 20 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 to southwest force 4.
    Moderate seas.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    South force 4 to 5.
    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 southwest force 3

    Shantou Wind south force 2
      Visibility 21 Kilometres

    Huangmaozhou Wind west-southwest force 2

    Macau Wind south force 2
      Visibility 26 Kilometres

    Xisha Wind east force 2
      Visibility 30 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 09:30 HKT 20/MAY/2018
    (Next update at 12:30 HKT 20/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 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  200/5-10                             29-35
   B.   2000 FT:  210/10-15                            24
   C.   5000 FT:  220/10                               21
   D.  10000 FT:  180/10                               13
   E.  18000 FT:  120/10                               MS4
   F.  24000 FT:  070/10                               MS14
   G.  30000 FT:  090/15                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT.
   K. VISIBILITY    : 10 KM.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 11200 FT
   M. TURBULENCE    : NIL.
   N. SEA STATE     : 0.5-1.0 M     SEA TEMPERATURE    : 26 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT TO MODERATE SOUTH TO SOUTHWESTERLY WINDS.
     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 20/May/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     33.4 C
Minimum Air Temperature                     27.8 C
Grass Minimum Temperature                   26.4 C
Relative Humidity                        52 - 88 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January           170.7 mm
Against an average of                      498.9 mm

Other Stations                Min                  Max
King's Park                  27.2 C               33.2 C
Wong Chuk Hang               27.2 C               31.9 C
Ta Kwu Ling                  24.7 C               35.4 C
Lau Fau Shan                 26.9 C               33.0 C
Tai Po                       26.3 C               36.5 C
Sha Tin                      26.8 C               33.9 C
Tuen Mun                     26.9 C               34.9 C
Tseung Kwan O                26.1 C               34.8 C
Sai Kung                     26.8 C               34.6 C
Cheung Chau                  26.2 C               34.2 C
Chek Lap Kok                 28.0 C               35.3 C
Tsing Yi                     26.8 C               32.4 C
Shek Kong                    26.3 C               35.4 C
Tsuen Wan Ho Koon            24.9 C               32.7 C
Tsuen Wan Shing Mun Valley   26.5 C               32.5 C
Hong Kong Park               27.7 C               32.8 C
Shau Kei Wan                 27.3 C               34.0 C
Kowloon City                 27.3 C               34.4 C
Happy Valley                 27.8 C               34.0 C
Wong Tai Sin                 27.4 C               33.8 C
Stanley                      26.9 C               30.9 C
Kwun Tong                    27.7 C               33.8 C
Sham Shui Po                 27.0 C               31.9 C
Kai Tak Runway Park          27.6 C               33.7 C
Yuen Long Park               26.2 C               35.3 C
Tai Mei Tuk               26.5 C               35.8 C

Duration of sunshine (King's Park):              11.3 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):        26.3 C 

Yesterday's (19 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                           0.09
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                           0.10
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 19 May
     2003copy right image | Important notices | Privacy policy Last revision date: <20 May 2018> 

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