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Bulletin issued at 10:02 HKT 10/Aug/2017

At 10 a.m. at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 83 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.7. The intensity of UV radiation was low.

Widespread heavy rain may affect Hong Kong in a couple of hours. Members of the public should be on the alert.


Announcement on Localised Heavy Rain: More than 70 millimetres of rainfall were recorded in Tai Po District in the past 1 hour ending at 8:05 a.m. and may cause serious flooding.

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 11:45 a.m. today. A few squally thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

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

Between 8:45 and 9:45 a.m., lightning was detected within New Territories East. The rainfall recorded in various regions were:

Tai Po 0 to 4 mm;
North District 0 to 1 mm.


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


Climatological Information for 10 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 09:45 HKT 10/Aug/2017

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

An active southwesterly airstream is bringing showers and thunderstorms to the coast of Guangdong. Locally, more than 50 millimetres of rainfall were recorded over Kwai Tsing this morning, and rainfall over Tai Po even exceeded 70 millimetres.

Weather forecast for today

Mainly cloudy with showers. Showers will be heavy with a few squally thunderstorms at first. Showers will ease off later. Bright periods in the afternoon. Moderate to fresh southwesterly winds.

Outlook : Showers easing off tomorrow. Mainly fine and very hot over the weekend and early next week.


(The above forecast period is valid up to 23:59 HKT today, 10/08/2017; 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 09:00 HKT 10/Aug/2017

GALE WARNING AREA: TAIWAN STRAIT.

GENERAL SITUATION AT 092100 UTC:
A SOUTHWESTERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 100100 UTC:

HONG KONG= SW 4-5, OCNL 6. DOWN TO 2000 M IN ISOL HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 3 M. TEMP 32-28 C. =
KWANGTUNG= SW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. =
TAIWAN STRAIT= SW 6-7, OCNL 8 IN N. ISOL SHOWERS AND TS. SEA UP TO 6 M. SWELL SW 2 M. =
BASHI= SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. =
PRATAS= SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. =
BALINTANG= SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. =
SCARBOROUGH= SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
PARACEL= S TO SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. =
TONKIN= S TO SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. =
DANANG= S TO SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 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

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    Bulletin issued at 09:30 HKT 10/Aug/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 10 August 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    An active southwesterly airstream is affecting the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Southwest force 4 to 5, occasionally force 6.
    Isolated heavy squally showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao, Shanwei and South of Hong Kong:
    Southwest force 5 to 6.
    Isolated squally showers and thunderstorms.
    Moderate to rough seas.

    Shangchuan Dao:
    South to southwest force 5 to 6.
    Isolated squally showers and thunderstorms.
    Moderate to rough seas.

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

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

    Waglan Island Wind southwest force 4
      Visibility 15 Kilometres

    Shantou Wind south-southwest force 2
      Visibility 30 Kilometres in showers

    Dongsha Wind southwest force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind south-southwest force 4

    Macau Wind south force 2
      Visibility 11 Kilometres

    Xisha Wind south force 3
      Visibility 14 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 09:00 HKT 10/AUG/2017
    (Next update at 17:30 HKT 10/AUG/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB. 
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN ACTIVE SOUTHWESTERLY AIRSTREAM IS AFFECTING
     THE SOUTH CHINA COASTAL AREAS.
     
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  230/10
                  TEMPO VRB/25G35 IN TS
       OFFSHORE:  230/15-20 OCNL 25                    28-33
   B.   2000 FT:  230/20-25 OCNL 30                    24
   C.   5000 FT:  240/20                               21
   D.  10000 FT:  240/20                               13
   E.  18000 FT:  240/15                               MS2
   F.  24000 FT:  230/10                               MS13
   G.  30000 FT:  270/10                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      MAINLY CLOUDY WITH SHOWERS. SHOWERS WILL BE
      HEAVY AT TIMES AT FIRST. A FEW ISOLATED
      THUNDERSTORMS. SUNNY INTERVALS IN THE AFTERNOON.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1200 FT  SCT 2500 FT TEMPO FEW 800 FT SCT
      CB 1200 FT  BKN 4000 FT
   K. VISIBILITY    : 10 KM  TEMPO 3000 M IN SHOWERS  TEMPO 1500 M IN TS
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 10800 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS, OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 2.0-3.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH SOUTHWESTERLY 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 12:20 HKT on 04 Aug 17

    VHHK SIGMET 1 VALID 040020/040420 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1930 E11130 - N2124 E11130 - N2230 E11342 - N2300 E11512 - N2012 E11406 - N1930 E11130 TOP FL420 MOV N 10KT NC= VHHK SIGMET 2 VALID 040420/040820 VHHH- VHHK HONG KONG FIR EMBD TS FCSTWI N2006 E11130 - N2124 E11130 - N2230 E11342 - N2254 E11454 - N2130 E11454 - N2006 E11130 TOP FL420 MOV N 10KT NC= VHHK SIGMET 3 VALID 040420/040820 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2006 E11130 - N2124 E11130 - N2230 E11342 - N2254 E11454 - N2130 E11454 - N2006 E11130 TOP FL420 MOV N 10KT NC=

    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.

    The latest report on Tropical Cyclone Roke broadcast by Miss LEE SHUK MING , Senior Scientific Officer of the Hong Kong Observatory at 6:23 p.m. on 23 Jul 2017.
    Listen Listen

    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 10/Aug/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.0 C
Minimum Air Temperature                     26.3 C
Grass Minimum Temperature                   28.0 C
Relative Humidity                        76 - 91 Percent
Rainfall                                    14.3 mm 
Total rainfall since 1st January          1890.5 mm
Against an average of                     1584.4 mm

Other Stations                Min                  Max
King's Park                  26.3 C               30.9 C
Wong Chuk Hang               27.8 C               30.7 C
Ta Kwu Ling                  26.4 C               33.3 C
Lau Fau Shan                 26.7 C               31.8 C
Tai Po                       27.7 C               32.0 C
Sha Tin                      28.0 C               32.3 C
Tuen Mun                     27.0 C               32.0 C
Tseung Kwan O                27.5 C               29.8 C
Sai Kung                     28.5 C               31.6 C
Cheung Chau                  26.0 C               30.3 C
Chek Lap Kok                 27.2 C               32.4 C
Tsing Yi                     27.7 C               31.3 C
Shek Kong                    27.2 C               33.0 C
Tsuen Wan Ho Koon            26.3 C               30.6 C
Tsuen Wan Shing Mun Valley   27.2 C               31.8 C
Hong Kong Park               26.7 C               30.8 C
Shau Kei Wan                 27.0 C               31.3 C
Kowloon City                 26.2 C               32.3 C
Happy Valley                 28.3 C               31.3 C
Wong Tai Sin                 26.7 C               30.7 C
Stanley                      27.4 C               30.6 C
Kwun Tong                    26.8 C               30.8 C
Sham Shui Po                 27.0 C               31.7 C
Kai Tak Runway Park          26.6 C               31.1 C
Yuen Long Park               27.4 C               32.4 C
Tai Mei Tuk               27.1 C               30.4 C

Duration of sunshine (King's Park):              1.6 H
The mean UV index recorded at King's Park yesterday was 3,
the UV intensity was Moderate.
The maximum UV index for yesterday was 9.
 

Yesterday's (09 Aug 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                               0.08
Yuen Ng Fan                         0.11
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.11
Sai Wan Ho                          0.09
King's Park                         0.14
Tsim Bei Tsui                       0.12
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 09 Aug
     2003copy right image | Important notices | Privacy policy Last revision date: <10 Aug 2017> 

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