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Bulletin issued at 17:06 HKT 05/Jul/2017

At 5 p.m. at the Hong Kong Observatory the air temperature was 29 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.

Gusts reaching 80 kilometres per hour or above may continue to affect Hong Kong.

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 7:00 p.m. today. Isolated squally thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 29 degrees;
Wong Chuk Hang 27 degrees;
Ta Kwu Ling 30 degrees;
Lau Fau Shan 30 degrees;
Tai Po 29 degrees;
Sha Tin 30 degrees;
Tuen Mun 27 degrees;
Tseung Kwan O 28 degrees;
Sai Kung 29 degrees;
Cheung Chau 25 degrees;
Chek Lap Kok 27 degrees;
Tsing Yi 28 degrees;
Shek Kong 30 degrees;
Tsuen Wan Ho Koon 29 degrees;
Tsuen Wan Shing Mun Valley 30 degrees;
Hong Kong Park 25 degrees;
Shau Kei Wan 26 degrees;
Kowloon City 29 degrees;
Happy Valley 26 degrees;
Wong Tai Sin 29 degrees;
Stanley 26 degrees;
Kwun Tong 28 degrees;
Sham Shui Po 30 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 30 degrees;
Tai Mei Tuk 28 degrees.

Between 3:45 and 4:45 p.m., lightning was detected within Lantau. The rainfall recorded in various regions were:

Islands District 2 to 16 mm;
Southern District 5 to 14 mm;
Central & Western District 4 to 10 mm;
Tsuen Wan 0 to 5 mm;
Tuen Mun 0 to 5 mm;
Wan Chai 0 to 5 mm;
Sai Kung 0 to 2 mm;
Yuen Long 0 to 1 mm.


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


Climatological Information for 5 Jul

Regional Weather in Hong Kong

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Bulletin updated at 16:45 HKT 05/Jul/2017

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

A broad trough of low pressure is bringing showers and thunderstorms to the northern part of the South China Sea and the coast of Guangdong.

Weather forecast for tonight and tomorrow

Mainly cloudy with a few showers and squally thunderstorms. More showers tomorrow. Temperatures will range between 26 and 30 degrees. Moderate east to southeasterly winds.

Outlook : There will be showers and thunderstorms in the following couple of days. Showers will ease off with sunny periods on Sunday.


(The above forecast period is valid up to 23:59 HKT tomorrow, 06/07/2017; 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 09:00 HKT 05/Jul/2017

N0 WARNING.

GENERAL SITUATION AT 042100 UTC:
A SOUTHERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 050100 UTC:

HONG KONG= SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. TEMP 31-26 C. =
KWANGTUNG= SE 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. =
TAIWAN STRAIT= SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL SE UP TO 2 M. =
BASHI= SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
PRATAS= SE 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. =
BALINTANG= SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
SCARBOROUGH= SE 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. =
PARACEL= S TO SW 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. =
TONKIN= S TO SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= S TO SE 4-5. DOWN TO 4000 M IN ISOL SQUALLY 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
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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    9-day Weather Forecast | UV Index Forecast | Weather Information for Fishermen

    Bulletin issued at 16:30 HKT 05/Jul/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 05 July 2017

    Warnings:
    Strong winds in Nan'ao, Shanwei and south of Hong Kong.

    Weather Situation:
    A board trough of low pressure is bringing unsettled weather to the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Southeast force 4 to 5.
    Scattered showers and squally thunderstorms.
    Moderate seas.

    Nan'ao, Shanwei and South of Hong Kong:
    Southeast force 4 to 5, occasionally force 6.
    Scattered showers and squally thunderstorms.
    Moderate to rough seas.

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

    Outlook for the next 48 hours
    South to southeasterly winds of force 4 to 5. Scattered showers and squally thunderstorms.

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

    Waglan Island Wind southeast force 3
      Visibility 14 Kilometres

    Shantou Wind east force 2
      Visibility 30 Kilometres

    Dongsha Wind southeast force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 5

    Macau Wind east force 3
      Visibility 28 Kilometres

    Xisha Wind west-southwest 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 17:30 HKT 05/JUL/2017
    (Next update at 17:30 HKT 05/JUL/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 :
     A SOUTHERLY AIRSTREAM IS BRINGING UNSETTLED
     WEATHER TO THE SOUTH CHINA COASTAL AREAS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  120/10
                  TEMPO VRB/15G30 IN TS
       OFFSHORE:  120/15-20                            29-26
   B.   2000 FT:  130/15-20, OCNL 25                   22
   C.   5000 FT:  140/20                               19
   D.  10000 FT:  150/20                               12
   E.  18000 FT:  130/15                               MS2
   F.  24000 FT:  120/10                               MS13
   G.  30000 FT:  070/10                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS AND SQUALLY
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 FT.  
      TEMPO FEW CB 1000 FT  SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 10 KM.  TEMPO 3000 M IN SHOWERS.  
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11200 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTHEASTERLY WINDS.  MAINLY CLOUDY
     WITH OCCASIONAL SHOWERS AND A FEW SQUALLY
     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 14:35 HKT on 05 Jul 17

    VHHK SIGMET 3 VALID 050535/050930 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2118 E11230 - N2100 E11500 - N2000 E11600 - N1900 E11500 - N1900 E11300 - N2118 E11230 TOP FL450 MOV NW 10KT NC= VHHK SIGMET 5 VALID 050635/051035 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1930 E11130 - N2130 E11130 - N2212 E11330 - N2100 E11530 - N1930 E11530 - N1830 E11224 - N1930 E11130 TOP FL450 MOV NW 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.

    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 05/Jul/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.6 C
Minimum Air Temperature                     25.3 C
Grass Minimum Temperature                   25.1 C
Relative Humidity                        84 - 97 Percent
Rainfall                                    32.3 mm 
Total rainfall since 1st January          1246.7 mm
Against an average of                     1143.9 mm

Other Stations                Min                  Max
King's Park                  24.9 C               29.5 C
Wong Chuk Hang               25.0 C               30.3 C
Ta Kwu Ling                  24.6 C               30.2 C
Lau Fau Shan                 24.6 C               29.8 C
Tai Po                       25.0 C               27.5 C
Sha Tin                      25.7 C               29.9 C
Tuen Mun                     25.1 C               29.4 C
Tseung Kwan O                24.6 C               29.5 C
Sai Kung                     24.7 C               29.5 C
Cheung Chau                  24.2 C               27.0 C
Chek Lap Kok                 25.5 C               31.6 C
Tsing Yi                     25.2 C               30.9 C
Shek Kong                    25.1 C               30.6 C
Tsuen Wan Ho Koon            24.2 C               27.8 C
Tsuen Wan Shing Mun Valley   24.7 C               29.7 C
Hong Kong Park               24.7 C               30.6 C
Shau Kei Wan                 23.5 C               29.4 C
Kowloon City                 24.9 C               30.0 C
Happy Valley                 25.4 C               31.5 C
Wong Tai Sin                 24.7 C               30.4 C
Stanley                      24.7 C               29.9 C
Kwun Tong                    24.6 C               29.7 C
Sham Shui Po                 24.8 C               30.9 C
Kai Tak Runway Park          25.1 C               29.4 C
Yuen Long Park               24.5 C               30.9 C
Tai Mei Tuk               24.6 C               29.1 C

Duration of sunshine (King's Park):              2.3 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 11.
 

Yesterday's (04 Jul 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                         0.11
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                       0.13
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 04 Jul
     2003copy right image | Important notices | Privacy policy Last revision date: <05 Jul 2017> 

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