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Bulletin issued at 03:02 HKT 30/Apr/2017

At 3 a.m. at the Hong Kong Observatory the air temperature was 22 degrees Celsius and the relative humidity 82 per cent.

The air temperatures at other places were:

King's Park 21 degrees;
Wong Chuk Hang 19 degrees;
Ta Kwu Ling 18 degrees;
Lau Fau Shan 20 degrees;
Tai Po 20 degrees;
Sha Tin 19 degrees;
Tuen Mun 21 degrees;
Tseung Kwan O 19 degrees;
Sai Kung 19 degrees;
Cheung Chau 21 degrees;
Chek Lap Kok 22 degrees;
Tsing Yi 20 degrees;
Shek Kong 18 degrees;
Tsuen Wan Ho Koon 19 degrees;
Tsuen Wan Shing Mun Valley 18 degrees;
Hong Kong Park 20 degrees;
Shau Kei Wan 20 degrees;
Kowloon City 21 degrees;
Happy Valley 19 degrees;
Wong Tai Sin 20 degrees;
Stanley 20 degrees;
Kwun Tong 21 degrees;
Sham Shui Po 20 degrees;
Kai Tak Runway Park 21 degrees;
Yuen Long Park 19 degrees;
Tai Mei Tuk 21 degrees.


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


Climatological Information for 30 Apr

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


Local Weather Forecast
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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 02:45 HKT 30/Apr/2017

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

A relatively dry easterly airstream is bringing fine weather to southern China.

Weather forecast for today

Mainly fine. Dry during the day. Temperatures will range between 22 and 28 degrees. Moderate east to southeasterly winds.

Outlook : Warm with sunny periods in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 30/04/2017; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

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MARINE FORECAST
Traditional Chinese Simplified Chinese

Marine Forecast

Weather Information for the Marine Community

Bulletin issued at 21:00 HKT 29/Apr/2017

N0 WARNING.

GENERAL SITUATION AT 290900 UTC:
AN EASTERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 291300 UTC:

HONG KONG= E TO SE 4. FINE. TEMP 22-28 C. =
KWANGTUNG= E TO SE 4, OCNL 5. FINE. SEA UP TO 2 M. =
TAIWAN STRAIT= E TO NE 4, OCNL 5. FINE. SEA UP TO 2 M. =
BASHI= E 4-5. FINE. SEA UP TO 2 M. SWELL NE UP TO 2 M. =
PRATAS= E 4-5. FINE. SEA UP TO 2 M. SWELL NE UP TO 2 M. =
BALINTANG= E 4-5, OCNL 6 AT FIRST. ISOL SHOWERS AND TS. SEA 2 M, UP TO 3 M AT FIRST. SWELL NE UP TO 2 M. =
SCARBOROUGH= E TO NE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL NE UP TO 2 M. =
PARACEL= E TO SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL NE UP TO 2 M. =
TONKIN= E TO SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= E TO SE 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

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

    Bulletin issued at 03:30 HKT 30/Apr/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 30 April 2017

    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.
    Moderate seas.

    Nan'ao and Shanwei:
    East force 4, occasionally force 5.
    Moderate seas.

    South of Hong Kong and Shangchuan Dao:
    East to southeast force 4, occasionally force 5.
    Moderate seas.

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

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

    Waglan Island Wind variable force 1
      Visibility 9 Kilometres

    Shantou Wind calm
      Visibility 5000 Metres in mist

    Dongsha Wind east-northeast force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind southeast force 2

    Macau Wind south force 1
      Visibility 10 Kilometres

    Xisha Wind east-northeast force 1
      Visibility 29 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
  • Tidal Information

    • WEATHER FORECAST FOR LOCAL AVIATION
    Traditional Chinese Simplified Chinese

    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 30/APR/2017
    (Next update at 9:00-9:30 HKT 30/APR/2017)
    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:  140/5-10                             20-26
   B.   2000 FT:  160/10                               18
   C.   5000 FT:  340/10                               14
   D.  10000 FT:  290/20                               10
   E.  18000 FT:  280/40                               MS4
   F.  24000 FT:  270/40                               MS16
   G.  30000 FT:  270/50                               MS31
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT.
   K. VISIBILITY    : 9 KM.
   L. 0 DEG. C LEVEL: 15000 FT      10 DEG. C LEVEL(S) : 10000 FT
   M. TURBULENCE    : NIL
   N. SEA STATE     : 0.5-1.0 M     SEA TEMPERATURE    : 22 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTHEASTERLY 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 16:45 HKT on 27 Apr 17

    VHHK SIGMET 2 VALID 270445/270845 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1936 E11618 - N1936 E11154 - N2200 E11600 - N2200 E11730 - N2100 E11730 TOP FL380 MOV E 10KT NC= VHHK SIGMET 4 VALID 270845/271245 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2000 E11642 - N1836 E11536 - N1836 E11218 - N2000 E11254 - N2000 E11642 TOP FL380 MOV E 10KT WKN=

    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 30/Apr/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     27.3 C
Minimum Air Temperature                     19.9 C
Grass Minimum Temperature                   19.2 C
Relative Humidity                        61 - 88 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January           134.5 mm
Against an average of                      330.3 mm

Other Stations                Min                  Max
King's Park                  18.7 C               27.2 C
Wong Chuk Hang               16.7 C               24.3 C
Ta Kwu Ling                  15.3 C               27.8 C
Lau Fau Shan                 17.6 C               26.3 C
Tai Po                       17.3 C               26.0 C
Sha Tin                      16.4 C               26.9 C
Tuen Mun                     17.9 C               27.4 C
Tseung Kwan O                16.8 C               26.8 C
Sai Kung                     17.7 C               26.2 C
Cheung Chau                  18.6 C               24.9 C
Chek Lap Kok                 19.3 C               27.4 C
Tsing Yi                     18.0 C               26.1 C
Shek Kong                    16.5 C               28.2 C
Tsuen Wan Ho Koon            16.7 C               25.4 C
Tsuen Wan Shing Mun Valley   16.6 C               27.0 C
Hong Kong Park               18.6 C               27.5 C
Shau Kei Wan                 18.9 C               24.4 C
Kowloon City                 18.8 C               25.7 C
Happy Valley                 17.3 C               27.0 C
Wong Tai Sin                 17.6 C               26.2 C
Stanley                      18.5 C               25.1 C
Kwun Tong                    19.0 C               26.5 C
Sham Shui Po                 18.7 C               26.9 C
Kai Tak Runway Park          19.8 C               24.4 C
Yuen Long Park               16.7 C               28.6 C
Tai Mei Tuk               18.0 C               27.3 C

Duration of sunshine (King's Park):              9.9 H
The mean UV index recorded at King's Park yesterday was 4,
the UV intensity was Moderate.
The maximum UV index for yesterday was 9.
 

Yesterday's (29 Apr 2017) 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                           0.12
Sai Wan Ho                          0.09
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.15

Note

      

    1. From readings taken at various locations in Hong Kong during
the period 1987-2016, the background ambient gamma radiation
levels may vary between 0.06 and 0.30 microsievert per hour.

    2. The extent of health effects to a person as a result of
exposure to radiation is expressed by a physical quantity
called equivalent dose, in unit of sievert.  Protective
action may be required if there is an increase in the
ambient gamma dose rate above background such that the total
additional dose is expected to exceed 5000 microsieverts in
a relatively short period of time. For example, a dose of
5000 microsieverts may be reached when the ambient gamma
dose rate is 1000 microsieverts per hour (several thousand
times above background) and lasts for 5 hours.

    3. The readings of ambient gamma radiation level from
instrument are expressed in unit of gray, which is
numerically equal to the gamma dose expressed in sievert.
    Climatological Information for 29 Apr
     2003copy right image | Important notices | Privacy policy Last revision date: <30 Apr 2017> 

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