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Bulletin issued at 10:02 HKT 13/May/2017

At 10 a.m. at the Hong Kong Observatory the air temperature was 26 degrees Celsius and the relative humidity 79 per cent.
During the past hour the mean UV Index recorded at King's Park was 1. The intensity of UV radiation was low.

The air temperatures at other places were:

King's Park 26 degrees;
Wong Chuk Hang 27 degrees;
Ta Kwu Ling 26 degrees;
Lau Fau Shan 26 degrees;
Tai Po 26 degrees;
Sha Tin 27 degrees;
Tuen Mun 26 degrees;
Tseung Kwan O 26 degrees;
Sai Kung 27 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 27 degrees;
Tsing Yi 27 degrees;
Shek Kong 27 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 26 degrees;
Hong Kong Park 26 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 27 degrees;
Happy Valley 27 degrees;
Wong Tai Sin 27 degrees;
Stanley 27 degrees;
Kwun Tong 27 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 27 degrees;
Yuen Long Park 27 degrees;
Tai Mei Tuk 27 degrees.


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


Climatological Information for 13 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 13/May/2017

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

A trough of low pressure is bringing showers to the coastal areas of Guangdong.

Weather forecast for today

Mainly cloudy with a few showers and isolated thunderstorms. Light to moderate southwesterly winds.

Outlook : Sunny intervals and one or two showers tomorrow. Heavy showers on Monday and at first on Tuesday.


(The above forecast period is valid up to 23:59 HKT today, 13/05/2017; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

Information on Tropical Cyclones

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MARINE FORECAST
Traditional Chinese Simplified Chinese

Marine Forecast

Weather Information for the Marine Community

Bulletin issued at 09:00 HKT 13/May/2017

N0 WARNING.

GENERAL SITUATION AT 122100 UTC:
TROUGH 18N 107E 22N 116E 26N 125E QSTNR.

MARINE FORECAST FOR 24 HOURS FROM 130100 UTC:

HONG KONG= SW 3-4. ISOL SHOWERS AND TS. TEMP 29-25 C. =
KWANGTUNG= S TO SW 4. ISOL SHOWERS AND TS. =
TAIWAN STRAIT= SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
BASHI= SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
PRATAS= SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
BALINTANG= SW 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
SCARBOROUGH= E TO NE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
PARACEL= S TO SE 4, OCNL 5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
TONKIN= E TO SE 4-5. ISOL SHOWERS AND SQUALLY TS. SEA UP TO 2 M. =
DANANG= E TO SE 4-5. ISOL SHOWERS AND SQUALLY 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 13/May/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 13 May 2017

    Weather Situation:
    The unsettled weather associated with a trough of low pressure is affecting the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Southwest force 3 to 4.
    Isolated showers and thunderstorms.
    Slight to moderate seas.

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

    Shangchuan Dao:
    South to southwest force 4.
    Isolated showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    Southeasterly winds of force 4 to 5, becoming northwesterly winds of up to force 6 later. Isolated showers and thunderstorms.

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

    Waglan Island Wind northwest force 2
      Visibility 19 Kilometres

    Shantou Wind west-southwest force 2
      Visibility 25 Kilometres

    Dongsha Wind west-northwest force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind west-northwest force 2

    Macau Wind northwest force 1
      Visibility 12 Kilometres

    Xisha Wind east-southeast force 1
      Visibility 30 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 09:00 HKT 13/MAY/2017
    (Next update at 17:30 HKT 13/MAY/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A TROUGH OF LOW PRESSURE IS BRINGING SHOWERS TO
     THE COASTAL AREAS OF GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  VRB/5-10
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  240/10                               26-29
   B.   2000 FT:  250/10-15                            23
   C.   5000 FT:  250/15                               18
   D.  10000 FT:  260/25                               9
   E.  18000 FT:  260/30                               MS6
   F.  24000 FT:  260/40                               MS16
   G.  30000 FT:  260/50                               MS30
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS AND ISOLATED
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT  SCT 4000 FT.  TEMPO FEW CB 1000 FT
      SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 9 KM.  TEMPO 4000 M IN SHOWERS.
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 15000 FT      10 DEG. C LEVEL(S) : 9600 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 SOUTHERLY 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 06:15 HKT on 13 May 17

    VHHK SIGMET 1 VALID 121820/122220 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1948 E11130 - N2124 E11130 - N2206 E11254 - N2012 E11300 - N1948 E11130 TOP FL400 MOV NE 05KT NC= VHHK SIGMET 2 VALID 122220/130220 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1942 E11130 - N2124 E11130 - N2206 E11254 - N2012 E11254 - N1942 E11130 TOP FL400 MOV ENE 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 13/May/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     30.7 C
Minimum Air Temperature                     26.0 C
Grass Minimum Temperature                   25.1 C
Relative Humidity                        61 - 91 Percent
Rainfall                                      TRACE 
Total rainfall since 1st January           198.8 mm
Against an average of                      453.7 mm

Other Stations                Min                  Max
King's Park                  25.6 C               30.7 C
Wong Chuk Hang               25.0 C               29.2 C
Ta Kwu Ling                  24.3 C               31.8 C
Lau Fau Shan                 25.3 C               30.2 C
Tai Po                       25.2 C               30.9 C
Sha Tin                      25.6 C               31.4 C
Tuen Mun                     25.0 C               31.8 C
Tseung Kwan O                24.7 C               32.7 C
Sai Kung                     25.8 C               30.6 C
Cheung Chau                  25.0 C               30.1 C
Chek Lap Kok                 26.5 C               31.2 C
Tsing Yi                     25.5 C               30.7 C
Shek Kong                    24.7 C               31.7 C
Tsuen Wan Ho Koon            24.3 C               29.6 C
Tsuen Wan Shing Mun Valley   24.9 C               30.7 C
Hong Kong Park               25.6 C               32.2 C
Shau Kei Wan                 25.0 C               32.2 C
Kowloon City                 25.4 C               32.4 C
Happy Valley                 25.7 C               32.9 C
Wong Tai Sin                 25.7 C               32.2 C
Stanley                      25.4 C               29.1 C
Kwun Tong                    25.9 C               31.9 C
Sham Shui Po                 26.1 C               31.5 C
Kai Tak Runway Park          25.6 C               31.8 C
Yuen Long Park               25.2 C               31.9 C
Tai Mei Tuk               25.4 C               31.6 C

Duration of sunshine (King's Park):              5.6 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 10.
 

Yesterday's (12 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                             0.09
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 12 May
     2003copy right image | Important notices | Privacy policy Last revision date: <13 May 2017> 

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