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Bulletin issued at 03:02 HKT 06/Jul/2017

At 3 a.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 95 per cent.

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 4:45 a.m. today. Isolated thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

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

Between 1:45 and 2:45 a.m., lightning was detected within New Territories East, New Territories West, Hong Kong and Kowloon. The rainfall recorded in various regions were:

Sha Tin 2 to 14 mm;
Sai Kung 1 to 13 mm;
Tuen Mun 0 to 12 mm;
Tsuen Wan 0 to 12 mm;
Wong Tai Sin 8 to 10 mm;
Kowloon City 0 to 8 mm;
Tai Po 0 to 7 mm;
Yuen Long 0 to 7 mm;
Kwun Tong 5 to 7 mm;
Kwai Tsing 0 to 3 mm;
Yau Tsim Mong 0 to 1 mm.


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


Climatological Information for 6 Jul

Regional Weather in Hong Kong

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Bulletin updated at 02:45 HKT 06/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. Locally, showers around midnight brought more than 10 millimetres of rainfall to parts of the territory.

Weather forecast for today

Mainly cloudy with occasional showers and a few squally thunderstorms. Temperatures will range between 26 and 30 degrees. Moderate southeasterly winds, fresh at times offshore.

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 today, 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 21:00 HKT 05/Jul/2017

N0 WARNING.

GENERAL SITUATION AT 050900 UTC:
TROUGH 19N 110E 18N 115E 17N 119E QSTNR

MARINE FORECAST FOR 24 HOURS FROM 051300 UTC:

HONG KONG= SE 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. TEMP 26-30 C. =
KWANGTUNG= S TO SE 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. =
TAIWAN STRAIT= S TO SE 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL SE UP TO 2 M. =
BASHI= SE 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. =
PRATAS= SE 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. =
BALINTANG= SE 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY 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. =
PARACEL= S TO SW 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. =
TONKIN= S TO SE 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= S TO SE 4-5. DOWN TO 2000 M IN SCT 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.


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    • 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 06/Jul/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 06 July 2017

    Warnings:
    Strong winds in Hong Kong adjacent waters, 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, occasionally force 6.
    Scattered showers and squally thunderstorms.
    Moderate to rough 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 east-southeast force 4
      Visibility 11 Kilometres

    Shantou Wind east-northeast force 1
      Visibility 30 Kilometres

    Dongsha Wind southeast force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind east-southeast force 4

    Macau Wind east-southeast force 2
      Visibility 17 Kilometres

    Xisha Wind south-southwest force 3
      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 06/JUL/2017
    (Next update at 9:00-9:30 HKT 06/JUL/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A BOARD TROUGH OF LOW PRESSURE IS BRINGING
     UNSETTLED WEATHER TO 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:  110/10
                  TEMPO VRB/15G30 IN TS
       OFFSHORE:  110/15-20                            25-32
   B.   2000 FT:  120/20-25                            22
   C.   5000 FT:  140/20                               19
   D.  10000 FT:  160/20                               12
   E.  18000 FT:  130/15                               MS2
   F.  24000 FT:  090/15                               MS14
   G.  30000 FT:  070/15                               MS29
   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: 17500 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS AND  NEAR HILLS
   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 01:35 HKT on 06 Jul 17

    VHHK SIGMET 8 VALID 051435/051735 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N2054 E11724 - N2030 E11312 - N2142 E11224 - N2236 E11412 - N2342 E11730 - N2100 E11730 TOP FL400 MOV NW 10KT NC= VHHK SIGMET 9 VALID 051735/052135 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N2042 E11718 - N2018 E11436 - N2218 E11324 - N2230 E11342 - N2342 E11730 - N2100 E11730 TOP FL400 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 06/Jul/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.0 C
Minimum Air Temperature                     26.5 C
Grass Minimum Temperature                   26.1 C
Relative Humidity                        77 - 96 Percent
Rainfall                                    27.5 mm 
Total rainfall since 1st January          1274.2 mm
Against an average of                     1152.1 mm

Other Stations                Min                  Max
King's Park                  26.1 C               30.9 C
Wong Chuk Hang               25.8 C               31.0 C
Ta Kwu Ling                  25.4 C               32.5 C
Lau Fau Shan                 24.8 C               32.6 C
Tai Po                       25.1 C               29.7 C
Sha Tin                      25.9 C               31.3 C
Tuen Mun                     26.0 C               32.4 C
Tseung Kwan O                25.1 C               30.2 C
Sai Kung                     25.9 C               30.4 C
Cheung Chau                  24.9 C               29.1 C
Chek Lap Kok                 26.4 C               33.4 C
Tsing Yi                     25.3 C               32.0 C
Shek Kong                    25.2 C               31.9 C
Tsuen Wan Ho Koon            25.0 C               30.9 C
Tsuen Wan Shing Mun Valley   24.9 C               31.7 C
Hong Kong Park               25.1 C               30.2 C
Shau Kei Wan                 25.1 C               29.8 C
Kowloon City                 25.8 C               31.5 C
Happy Valley                 26.1 C               31.5 C
Wong Tai Sin                 26.0 C               31.1 C
Stanley                      25.4 C               29.9 C
Kwun Tong                    26.3 C               30.1 C
Sham Shui Po                 26.0 C               31.8 C
Kai Tak Runway Park          26.0 C               30.5 C
Yuen Long Park               24.7 C               32.4 C
Tai Mei Tuk               25.3 C               31.2 C

Duration of sunshine (King's Park):              5.9 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 9.
 

Yesterday's (05 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                       0.12
Cape D'Aguilar                      0.12
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 05 Jul
     2003copy right image | Important notices | Privacy policy Last revision date: <06 Jul 2017> 

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