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Bulletin issued at 10:02 HKT 12/May/2017

At 10 a.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 77 per cent.
During the past hour the mean UV Index recorded at King's Park was 5. The intensity of UV radiation was moderate.

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 29 degrees;
Tai Po 28 degrees;
Sha Tin 29 degrees;
Tuen Mun 30 degrees;
Tseung Kwan O 30 degrees;
Sai Kung 29 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 28 degrees;
Shek Kong 29 degrees;
Tsuen Wan Ho Koon 27 degrees;
Tsuen Wan Shing Mun Valley 29 degrees;
Hong Kong Park 30 degrees;
Shau Kei Wan 30 degrees;
Kowloon City 31 degrees;
Happy Valley 30 degrees;
Wong Tai Sin 30 degrees;
Stanley 28 degrees;
Kwun Tong 29 degrees;
Sham Shui Po 30 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 30 degrees;
Tai Mei Tuk 30 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


Local Weather Forecast
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Bulletin updated at 09:45 HKT 12/May/2017

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

Showers and thunderstorms associated with a trough of low pressure are affecting inland Guangdong.

Weather forecast for today

Mainly cloudy with a few showers and isolated thunderstorms. Visibility relatively low at first. Hot with sunny intervals during the day. Light winds.

Outlook : A few showers tomorrow. Sunny intervals on Sunday. Occasional heavy showers on Monday and Tuesday.


(The above forecast period is valid up to 23:59 HKT today, 12/05/2017; 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 09:00 HKT 12/May/2017

N0 WARNING.

GENERAL SITUATION AT 112100 UTC:
TROUGH 21N 108E 23N 112E 25N 115E 28N 119E S 10KT.

MARINE FORECAST FOR 24 HOURS FROM 120100 UTC:

HONG KONG= E TO SE 3-4, BEC SW 3-4. ISOL SHOWERS AND TS. DOWN TO 2000 M IN MIST PATCHES AT FIRST. TEMP 31-25 C. =
KWANGTUNG= E TO SE 4, BEC SW 4. ISOL SHOWERS AND TS. DOWN TO 2000 M IN MIST PATCHES AT FIRST. =
TAIWAN STRAIT= SW 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL SE UP TO 2 M. =
BASHI= SE 4-5, OCNL 6, W TO SW 4-5 LATER. ISOL SHOWERS. SEA UP TO 3 M. SWELL SE UP TO 2 M. =
PRATAS= SE 4-5, BEC W TO SW 4-5. ISOL SHOWERS. SEA UP TO 2 M. SWELL SE UP TO 2 M. =
BALINTANG= SE 4-5, OCNL 6, W TO SW 4-5 LATER. ISOL SHOWERS. SEA UP TO 3 M. SWELL SE UP TO 2 M. =
SCARBOROUGH= E TO NE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
PARACEL= SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
TONKIN= SE 4, OCNL 5. ISOL SHOWERS AND TS. DOWN TO 2000 M IN MIST PATCHES AT NIGHT. SEA UP TO 2 M. =
DANANG= SE 4, OCNL 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 09:30 HKT 12/May/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 12 May 2017

    Weather Situation:
    A southeasterly airstream is affecting the coastal waters of Guangdong.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Southeast force 3 to 4, becoming southwest force 3 to 4.
    Visibility relatively low in some areas at first, isolated showers and thunderstorms.
    Slight to moderate seas.

    Nan'ao, Shanwei and South of Hong Kong:
    Southeast force 4, becoming southwest force 4.
    Isolated showers and thunderstorms.
    Moderate seas.

    Shangchuan Dao:
    Southeast force 4, becoming south to southwest force 4.
    Isolated showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    South to southwesterly winds of force 4 to 5, becoming south to southeasterly winds of force 4 to 5 later. Isolated showers and thunderstorms.

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

    Waglan Island Wind west force 3
      Visibility 11 Kilometres

    Shantou Wind southeast force 1
      Visibility 12 Kilometres

    Dongsha Wind south-southeast force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind west force 1

    Macau Wind west force 1
      Visibility 10 Kilometres

    Xisha Wind east force 2
      Visibility 24 Kilometres

  • Explanation of Seas or Sea Waves
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  • 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 09:00 HKT 12/MAY/2017
    (Next update at 17:30 HKT 12/MAY/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN AREA OF RAIN AND THUNDERSTORMS ASSOCIATED
     WITH A TROUGH OF LOW PRESSURE IS AFFECTING
     INLAND GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  VRB/5
                  TEMPO VRB/15G25 IN TS                27-31
   B.   2000 FT:  270/10-15                            23
   C.   5000 FT:  270/15                               19
   D.  10000 FT:  250/20                               11
   E.  18000 FT:  250/35                               MS6
   F.  24000 FT:  270/40                               MS15
   G.  30000 FT:  280/40                               MS29
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS AND ISOLATED
      THUNDERSTORMS.  SUNNY INTERVALS DURING THE DAY.
      LOCALIZED HAZE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 FT.  TEMPO FEW CB 1000 FT
      SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 4000 M IN SHOWERS/HAZE.
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 15500 FT      10 DEG. C LEVEL(S) : 10400 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS.
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT TO MODERATE SOUTH TO SOUTHWESTERLY WINDS.
     MAINLY CLOUDY WITH A FEW SHOWERS AND
     THUNDERSTORMS.=

    ===================================================================
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 14:10 HKT on 10 May 17

    VHHK SIGMET 1 VALID 100215/100615 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1918 E11142 - N1930 E11130 - N2124 E11130 - N2200 E11242 - N1930 E11400 - N1918 E11142 TOP FL400 STNR NC= VHHK SIGMET 3 VALID 100615/101015 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1824 E11230 - N1930 E11130 - N2124 E11130 - N2142 E11206 - N1924 E11424 - N1824 E11230 TOP FL400 STNR 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 12/May/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.6 C
Minimum Air Temperature                     25.7 C
Grass Minimum Temperature                   24.9 C
Relative Humidity                        65 - 91 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January           198.8 mm
Against an average of                      449.5 mm

Other Stations                Min                  Max
King's Park                  25.3 C               30.6 C
Wong Chuk Hang               24.0 C               29.1 C
Ta Kwu Ling                  24.6 C               31.8 C
Lau Fau Shan                 23.8 C               30.6 C
Tai Po                       24.8 C               29.7 C
Sha Tin                      24.9 C               30.4 C
Tuen Mun                     24.6 C               31.9 C
Tseung Kwan O                25.0 C               30.3 C
Sai Kung                     25.2 C               30.1 C
Cheung Chau                  24.7 C               28.7 C
Chek Lap Kok                 25.9 C               31.4 C
Tsing Yi                     24.7 C               30.7 C
Shek Kong                    23.2 C               31.3 C
Tsuen Wan Ho Koon            23.3 C               29.9 C
Tsuen Wan Shing Mun Valley   24.0 C               30.6 C
Hong Kong Park               25.1 C               30.7 C
Shau Kei Wan                 24.9 C               28.9 C
Kowloon City                 25.1 C               30.5 C
Happy Valley                 25.0 C               31.5 C
Wong Tai Sin                 25.3 C               30.5 C
Stanley                      25.3 C               29.5 C
Kwun Tong                    25.4 C               30.5 C
Sham Shui Po                 25.5 C               31.6 C
Kai Tak Runway Park          25.7 C               28.1 C
Yuen Long Park               23.4 C               32.3 C
Tai Mei Tuk               24.7 C               30.8 C

Duration of sunshine (King's Park):              6.4 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 11.
 

Yesterday's (11 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                         0.12
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                        0.14

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 11 May
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