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Bulletin issued at 04:02 HKT 12/May/2018

At 4 a.m. at the Hong Kong Observatory the air temperature was 24 degrees Celsius and the relative humidity 89 per cent.

The air temperatures at other places were:

King's Park 24 degrees;
Wong Chuk Hang 24 degrees;
Ta Kwu Ling 24 degrees;
Lau Fau Shan 23 degrees;
Sha Tin 24 degrees;
Tuen Mun 24 degrees;
Tseung Kwan O 23 degrees;
Sai Kung 24 degrees;
Cheung Chau 23 degrees;
Chek Lap Kok 25 degrees;
Tsing Yi 25 degrees;
Shek Kong 24 degrees;
Tsuen Wan Ho Koon 23 degrees;
Tsuen Wan Shing Mun Valley 24 degrees;
Hong Kong Park 24 degrees;
Shau Kei Wan 23 degrees;
Kowloon City 24 degrees;
Happy Valley 24 degrees;
Wong Tai Sin 24 degrees;
Stanley 24 degrees;
Kwun Tong 24 degrees;
Sham Shui Po 24 degrees;
Kai Tak Runway Park 24 degrees;
Yuen Long Park 24 degrees;
Tai Mei Tuk 23 degrees.


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


Climatological Information for 12 May

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 03:45 HKT 12/May/2018

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

The easterly airstream affecting the coast of Guangdong is moderating gradually.

Weather forecast for today

Mainly cloudy. Sunny intervals during the day. Temperatures will range between 23 and 27 degrees. Moderate east to southeasterly winds.

Outlook : Mainly fine and hot in the following few days.


(The above forecast period is valid up to 23:59 HKT today, 12/05/2018; 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 11/May/2018

N0 WARNING.

GENERAL SITUATION AT 110900 UTC:
AN EASTERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 111300 UTC:

HONG KONG= E TO SE 4-5. CLD. SEA UP TO 2 M. SWELL E UP TO 2 M. TEMP 23-27 C. =
KWANGTUNG= E TO SE 4-5. ISOL SHOWERS. SEA UP TO 2 M. SWELL E 2 M. =
TAIWAN STRAIT= NE 4-5, SW 4-5 LATER. ISOL SHOWERS. SEA UP TO 2 M. SWELL NE 2 M. =
BASHI= E 4-5. ISOL SHOWERS. SEA UP TO 2 M. SWELL E TO NE 2 M. =
PRATAS= E 4-5. ISOL SHOWERS. SEA UP TO 2 M. SWELL E TO NE 2 M. =
BALINTANG= E 4-5, OCNL 6. ISOL SHOWERS. SEA UP TO 3 M. SWELL E TO NE 2 M. =
SCARBOROUGH= E TO NE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL E TO NE 2 M. =
PARACEL= E TO SE 4-5. ISOL SHOWERS. SEA UP TO 2 M. SWELL E TO NE 2 M. =
TONKIN= SE 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. =
DANANG= SE 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL E 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
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    • 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 03:30 HKT 12/May/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 12 May 2018

    Weather Situation:
    An easterly airstream is affecting the south China coastal waters.

    Area forecasts for the next 24 hours

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

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    East to southeast force 4 to 5.
    Moderate seas.

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

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

    Waglan Island Wind east-northeast force 2
      Visibility 11 Kilometres

    Dongsha Wind east force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 4

    Macau Wind southeast force 1
      Visibility 3000 Metres in drizzle

    Xisha Wind east-southeast force 1
      Visibility 26 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 01:30 HKT 12/MAY/2018
    (Next update at 9:00-9:30 HKT 12/MAY/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN EASTERLY AIRSTREAM IS AFFECTING 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
       OFFSHORE:  110/10-15                            24-29
   B.   2000 FT:  120/10-15
                  170/10 LATER                         19
   C.   5000 FT:  200/10                               17
   D.  10000 FT:  240/10                               10
   E.  18000 FT:  220/10                               MS2
   F.  24000 FT:  220/10                               MS14
   G.  30000 FT:  240/15                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      3800-4200 FT
   I. WEATHER       : 
      MAINLY CLOUDY WITH ISOLATED SHOWERS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1000 FT  SCT 2000 FT
   K. VISIBILITY    : 9 KM.  TEMPO 4000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 10000 FT
   M. TURBULENCE    : MOD OFFSHORE AND  NEAR HILLS
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 24 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE EAST TO SOUTHEASTERLY WINDS.  MAINLY
     CLOUDY WITH SUNNY INTERVALS.=

    ===================================================================
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 08:29 HKT on 11 May 18

    VHHK SIGMET 1 VALID 110030/110430 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2042 E11330 - N2006 E11130 - N2130 E11130 - N2218 E11324 - N2042 E11330 TOP FL350 MOV NE 15KT 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 12/May/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     25.3 C
Minimum Air Temperature                     22.3 C
Grass Minimum Temperature                   22.3 C
Relative Humidity                        79 - 95 Percent
Rainfall                                     1.0 mm 
Total rainfall since 1st January           170.7 mm
Against an average of                      449.5 mm

Other Stations                Min                  Max
King's Park                  21.8 C               25.5 C
Wong Chuk Hang               22.5 C               26.7 C
Ta Kwu Ling                  22.3 C               28.0 C
Lau Fau Shan                 21.8 C               29.5 C
Sha Tin                      22.3 C               25.5 C
Tuen Mun                     23.0 C               26.9 C
Tseung Kwan O                21.6 C               24.1 C
Sai Kung                     22.4 C               24.1 C
Cheung Chau                  22.6 C               25.1 C
Chek Lap Kok                 23.3 C               28.8 C
Tsing Yi                     23.2 C               26.4 C
Shek Kong                    23.0 C               29.8 C
Tsuen Wan Ho Koon            21.7 C               26.6 C
Tsuen Wan Shing Mun Valley   22.7 C               25.8 C
Hong Kong Park               22.1 C               25.7 C
Shau Kei Wan                 21.7 C               23.6 C
Kowloon City                 22.0 C               24.9 C
Happy Valley                 22.7 C               25.7 C
Wong Tai Sin                 22.2 C               26.4 C
Stanley                      22.3 C               24.4 C
Kwun Tong                    21.8 C               24.5 C
Sham Shui Po                 23.0 C               27.2 C
Kai Tak Runway Park          22.6 C               24.3 C
Yuen Long Park               22.8 C               29.7 C
Tai Mei Tuk               21.9 C               24.5 C

Duration of sunshine (King's Park):              0.2 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.
Sea surface temperature (Waglan Island):        24.2 C 

Yesterday's (11 May 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                         0.11
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.09
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.13

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 11 May
     2003copy right image | Important notices | Privacy policy Last revision date: <12 May 2018> 

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