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Bulletin issued at 21:02 HKT 24/May/2017

At 9 p.m. at the Hong Kong Observatory the air temperature was 25 degrees Celsius and the relative humidity 92 per cent.

The air temperatures at other places were:

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


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


Climatological Information for 24 May

Regional Weather in Hong Kong

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Bulletin updated at 20:45 HKT 24/May/2017

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

Showers associated with a trough of low pressure are moving towards the northern part of the South China Sea gradually.

Weather forecast for tonight and tomorrow

Mainly cloudy with a few showers. Visibility relatively low in some areas at first. Temperatures will range between 23 and 27 degrees. Moderate north to northeasterly winds.

Outlook : Becoming fine in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 25/05/2017; 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 24/May/2017

N0 WARNING.

GENERAL SITUATION AT 240900 UTC:
TROUGH 19N 110E 22N 117E 26N 124E S SLOWLY

MARINE FORECAST FOR 24 HOURS FROM 241300 UTC:

HONG KONG= N TO NE 4-5. A FEW SHOWERS. DOWN TO 4000 M IN MIST PATCHES AT FIRST. SEA UP TO 2 M. TEMP 23-27 C. =
KWANGTUNG= N TO NE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
TAIWAN STRAIT= NE 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. =
BASHI= W TO NW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
PRATAS= S TO SW 4-5, BEC NE 5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
BALINTANG= W TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
SCARBOROUGH= SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
PARACEL= S TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
TONKIN= NE 5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. =
DANANG= N 5, S 4 AT FIRST. 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 19:30 HKT 24/May/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 24 May 2017

    Weather Situation:
    The thundery showers associated with a trough of low pressure is moving towards the northern part of the South China Sea gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North to northeast force 4 to 5.
    A few showers. Visibility relatively low in some areas at first.
    Moderate seas.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    North to northeast force 4 to 5.
    Isolated showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    East to northeasterly winds of force 5 to 6. Isolated showers and thunderstorms.

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

    Waglan Island Wind northwest force 3
      Visibility 5000 Metres

    Shantou Wind west force 2
      Visibility 21 Kilometres in showers

    Dongsha Wind west force 1
      Visibility 10 Kilometres

    Huangmaozhou Wind northwest force 4

    Macau Wind north-northwest force 2
      Visibility 1400 Metres in mist

    Xisha Wind south force 2
      Visibility 25 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 24/MAY/2017
    (Next update at 01:30 HKT 25/MAY/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE THUNDERY SHOWERS ASSOCIATED WITH A TROUGH OF
     LOW PRESSURE IS MOVING TOWARDS THE NORTHERN PART
     OF THE SOUTH CHINA SEA GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  340/10
       OFFSHORE:  340/10-15                            25-23
   B.   2000 FT:  360/15-20                            21
   C.   5000 FT:  240/10                               18
   D.  10000 FT:  290/15                               11
   E.  18000 FT:  300/20                               MS4
   F.  24000 FT:  280/20                               MS13
   G.  30000 FT:  270/25                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS.  LOCALISED
      MIST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 500 FT  SCT 2000 FT
   K. VISIBILITY    : 7 KM. TEMPO 2500 M IN SHOWERS/MIST.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 10200 FT
   M. TURBULENCE    : MOD NEAR HILLS
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTH TO NORTHEASTERLY WINDS. MAINLY
     CLOUDY WITH A FEW SHOWERS.=

    ===================================================================
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 21:10 HKT on 24 May 17

    VHHK SIGMET 4 VALID 241310/241710 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2042 E11300 - N2048 E11500 - N1954 E11454 - N1954 E11254 - N2042 E11300 TOP FL380 MOV E 05KT 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 24/May/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.5 C
Minimum Air Temperature                     24.6 C
Grass Minimum Temperature                   24.8 C
Relative Humidity                        85 - 99 Percent
Rainfall                                     4.1 mm 
Total rainfall since 1st January           260.2 mm
Against an average of                      547.1 mm

Other Stations                Min                  Max
King's Park                  24.4 C               29.6 C
Wong Chuk Hang               24.5 C               28.9 C
Ta Kwu Ling                  24.1 C               30.7 C
Lau Fau Shan                 23.9 C               30.9 C
Tai Po                       23.9 C               27.6 C
Sha Tin                      24.5 C               29.9 C
Tuen Mun                     24.7 C               30.9 C
Tseung Kwan O                24.3 C               27.7 C
Sai Kung                     24.6 C               28.0 C
Cheung Chau                  24.6 C               28.7 C
Chek Lap Kok                 24.9 C               32.0 C
Tsing Yi                     24.7 C               30.6 C
Shek Kong                    24.6 C               32.6 C
Tsuen Wan Ho Koon            23.9 C               30.1 C
Tsuen Wan Shing Mun Valley   24.5 C               30.4 C
Hong Kong Park               24.3 C               27.9 C
Shau Kei Wan                 24.3 C               27.2 C
Kowloon City                 24.2 C               29.5 C
Happy Valley                 25.0 C               30.2 C
Wong Tai Sin                 24.4 C               29.5 C
Stanley                      24.9 C               28.8 C
Kwun Tong                    24.7 C               29.6 C
Sham Shui Po                 24.7 C               31.0 C
Kai Tak Runway Park          25.2 C               28.1 C
Yuen Long Park               24.4 C               30.7 C
Tai Mei Tuk               23.9 C               28.7 C

Duration of sunshine (King's Park):              4.8 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.
Sea surface temperature (Waglan Island):        25.4 C 

Yesterday's (23 May 2017) 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                               0.09
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                        0.14

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 23 May
     2003copy right image | Important notices | Privacy policy Last revision date: <24 May 2017> 

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