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Bulletin issued at 04:02 HKT 20/Jul/2017

At 4 a.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 89 per cent.

The air temperatures at other places were:

King's Park 27 degrees;
Wong Chuk Hang 27 degrees;
Ta Kwu Ling 26 degrees;
Lau Fau Shan 26 degrees;
Tai Po 27 degrees;
Sha Tin 27 degrees;
Tuen Mun 26 degrees;
Tseung Kwan O 27 degrees;
Sai Kung 27 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 27 degrees;
Shek Kong 28 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 27 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 28 degrees;
Yuen Long Park 25 degrees;
Tai Mei Tuk 26 degrees.


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


Climatological Information for 20 Jul

Regional Weather in Hong Kong

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Bulletin updated at 03:45 HKT 20/Jul/2017

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

The subtropical ridge is bringing generally fine weather to southeastern China. Meanwhile, showers are affecting the coast of Guangdong and the northern part of the South China Sea.

Weather forecast for today

Mainly cloudy with a few showers. The minimum temperature will be about 27 degrees. Hot with sunny periods during the day. The maximum temperature will be around 32 degrees. Moderate east to southeasterly winds.

Outlook : Hot with sunny periods on Friday. Showery over the weekend.


(The above forecast period is valid up to 23:59 HKT today, 20/07/2017; 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 19/Jul/2017

N0 WARNING.

GENERAL SITUATION AT 190900 UTC:
A SOUTHEASTERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 191300 UTC:

HONG KONG= E TO SE 4-5. A FEW SHOWERS. SEA UP TO 2 M. TEMP 27-32 C. =
KWANGTUNG= E TO SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
TAIWAN STRAIT= S TO SW 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
BASHI= E TO SE 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. =
PRATAS= E TO SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
BALINTANG= E TO SE 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. =
SCARBOROUGH= S TO SE 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S UP TO 2 M. =
PARACEL= S TO SE 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S UP TO 2 M. =
TONKIN= S TO SE 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. =
DANANG= S TO SE 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S 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 20/Jul/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 20 July 2017

    Weather Situation:
    A southeasterly 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.
    A few showers.
    Moderate seas.

    Nan'ao:
    East to southeast force 4 to 5.
    Moderate seas.

    Shanwei and South of Hong Kong:
    East to southeast force 4 to 5.
    Isolated showers and thunderstorms.
    Moderate seas.

    Shangchuan Dao:
    Southeast force 4 to 5.
    Scattered squally showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    East to southeasterly winds of force 4 to 5, up to force 6 later. Scattered squally showers and thunderstorms later.

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

    Waglan Island Wind east-northeast force 4
      Visibility 27 Kilometres

    Shantou Wind northwest force 1
      Visibility 7 Kilometres

    Dongsha Wind north force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind east-northeast force 4

    Macau Wind east force 2
      Visibility 15 Kilometres

    Xisha Wind southeast force 2
      Visibility 30 Kilometres

  • Explanation of Seas or Sea Waves
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 20/JUL/2017
    (Next update at 9:00-9:30 HKT 20/JUL/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A SOUTHEASTERLY 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:  100/10-15                            27-32
   B.   2000 FT:  150/15                               22
   C.   5000 FT:  150/15                               19
   D.  10000 FT:  160/20                               12
   E.  18000 FT:  160/10                               MS4
   F.  24000 FT:  100/10                               MS14
   G.  30000 FT:  360/10                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 FT.
   K. VISIBILITY    : 10 KM.  TEMPO 4000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 11800 FT
   M. TURBULENCE    : MOD NEAR HILLS.
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE EAST TO SOUTHEASTERLY WINDS. SUNNY
     PERIODS AND 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 17:10 HKT on 19 Jul 17

    VHHK SIGMET 2 VALID 190510/190910 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1936 E11130 - N2124 E11130 - N2230 E11342 - N2324 E11642 - N2148 E11606 - N1936 E11324 - N1936 E11130 TOP FL450 MOV N 10KT NC= VHHK SIGMET 3 VALID 190910/191310 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2036 E11130 - N2124 E11130 - N2230 E11342 - N2324 E11636 - N2200 E11636 - N2030 E11300 - N2036 E11130 TOP FL400 MOV N 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 20/Jul/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     30.8 C
Minimum Air Temperature                     24.5 C
Grass Minimum Temperature                   27.3 C
Relative Humidity                        76 - 98 Percent
Rainfall                                    12.6 mm 
Total rainfall since 1st January          1704.5 mm
Against an average of                     1327.3 mm

Other Stations                Min                  Max
King's Park                  24.3 C               31.2 C
Wong Chuk Hang               24.5 C               31.6 C
Ta Kwu Ling                  24.5 C               31.9 C
Lau Fau Shan                 24.1 C               31.4 C
Tai Po                       24.2 C               29.9 C
Sha Tin                      24.6 C               31.4 C
Tuen Mun                     24.4 C               31.5 C
Tseung Kwan O                24.1 C               30.5 C
Sai Kung                     24.4 C               30.4 C
Cheung Chau                  24.0 C               28.9 C
Chek Lap Kok                 25.3 C               32.1 C
Tsing Yi                     24.5 C               32.8 C
Shek Kong                    24.3 C               32.7 C
Tsuen Wan Ho Koon            23.8 C               28.9 C
Tsuen Wan Shing Mun Valley   24.0 C               31.7 C
Hong Kong Park               24.3 C               32.1 C
Shau Kei Wan                 23.8 C               30.2 C
Kowloon City                 24.2 C               31.7 C
Happy Valley                 24.5 C               32.5 C
Wong Tai Sin                 24.2 C               31.1 C
Stanley                      24.2 C               30.5 C
Kwun Tong                    24.4 C               30.7 C
Sham Shui Po                 24.4 C               32.2 C
Kai Tak Runway Park          24.5 C               30.8 C
Yuen Long Park               24.2 C               32.4 C
Tai Mei Tuk               24.4 C               31.1 C

Duration of sunshine (King's Park):              7.1 H
The mean UV index recorded at King's Park yesterday was 5,
the UV intensity was Moderate.
The maximum UV index for yesterday was 13.
 

Yesterday's (19 Jul 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.07 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                           0.07
Tap Mun                             0.08
Kat O                               0.08
Yuen Ng Fan                         0.11
Tai Mei Tuk                         0.11
Sha Tau Kok                         0.10
Kwun Tong                           0.11
Sai Wan Ho                          0.09
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.12
Chek Lap Kok                        0.13

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 19 Jul
     2003copy right image | Important notices | Privacy policy Last revision date: <20 Jul 2017> 

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