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Bulletin issued at 13:21 HKT 07/Jul/2017

At 1 p.m. at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 81 per cent.
During the past hour the mean UV Index recorded at King's Park was 4. The intensity of UV radiation was moderate.

Please be reminded that:

The Thunderstorm Warning was issued at 1:20 p.m. It will remain effective until 2:30 p.m. today. Isolated squally thunderstorms are expected to occur over Lantau and New Territories West.

The air temperatures at other places were:

King's Park 29 degrees;
Wong Chuk Hang 28 degrees;
Ta Kwu Ling 30 degrees;
Lau Fau Shan 28 degrees;
Tai Po 29 degrees;
Sha Tin 29 degrees;
Tuen Mun 30 degrees;
Tseung Kwan O 31 degrees;
Sai Kung 31 degrees;
Cheung Chau 25 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 27 degrees;
Shek Kong 30 degrees;
Tsuen Wan Ho Koon 26 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 28 degrees;
Shau Kei Wan 30 degrees;
Kowloon City 28 degrees;
Happy Valley 29 degrees;
Wong Tai Sin 30 degrees;
Stanley 27 degrees;
Kwun Tong 30 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 31 degrees;
Yuen Long Park 31 degrees;
Tai Mei Tuk 29 degrees.

Between 11:45 a.m. and 12:45 p.m., the rainfall recorded in various regions were:

Islands District 0 to 6 mm;
Central & Western District 0 to 6 mm;
Kwai Tsing 0 to 2 mm;
Tsuen Wan 0 to 1 mm;
Sha Tin 0 to 1 mm;
Sham Shui Po 0 to 1 mm.


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


Climatological Information for 7 Jul

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Bulletin updated at 12:45 HKT 07/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 this afternoon and tonight

Mainly cloudy with showers and isolated squally thunderstorms. Moderate south to southwesterly winds, fresh at times offshore.

Outlook : Showers and thunderstorms tomorrow. Showers will ease off gradually with sunny periods in following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 07/07/2017; 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 12:40 HKT 07/Jul/2017

N0 WARNING.

GENERAL SITUATION AT 062100 UTC:
TROUGH 20N 107E 20N 112E 20N 117E QSTNR.

MARINE FORECAST FOR 24 HOURS FROM 070440 UTC:

HONG KONG= S TO SW 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. TEMP 29-27 C. =
KWANGTUNG= S 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. =
TAIWAN STRAIT= S 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S UP TO 2 M. =
BASHI= SE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S UP TO 2 M. =
PRATAS= S 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. =
BALINTANG= SE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S UP TO 2 M. =
SCARBOROUGH= S 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
PARACEL= S 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. =
TONKIN= S 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. =
DANANG= S 5-6. DOWN TO 2000 M IN SCT SQUALLY 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
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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 12:30 HKT 07/Jul/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 p.m. on 07 July 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    A broad 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:
    South to southwest force 4 to 5, occasionally force 6.
    Scattered showers and squally thunderstorms.
    Moderate to rough seas.

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

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

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

    Waglan Island Wind south-southwest force 3
      Visibility 18 Kilometres

    Shantou Wind south-southeast force 1
      Visibility 22 Kilometres in showers

    Dongsha Wind southwest force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind south force 5

    Macau Wind south-southeast force 1
      Visibility 35 Kilometres

    Xisha Wind south-southwest force 4
      Visibility 16 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 09:30 HKT 07/JUL/2017
    (Next update at 17:30 HKT 07/JUL/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A BROAD TROUGH OF LOW PRESSURE IS BRINGING
     UNSETTLED WEATHER TO 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:  170/10
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  180/15-20, OCNL 25                   27-30
   B.   2000 FT:  160/20-25                            24
   C.   5000 FT:  160/20                               19
   D.  10000 FT:  180/20                               11
   E.  18000 FT:  160/15                               MS3
   F.  24000 FT:  130/15                               MS13
   G.  30000 FT:  090/10                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH SHOWERS AND A FEW ISOLATED
      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) : 11800 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 SOUTHERLY WINDS.  CLOUDY WITH
     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 12:22 HKT on 07 Jul 17

    VHHK SIGMET 1 VALID 070220/070620 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2106 E11224 - N2200 E11430 - N1836 E11454 - N1742 E11330 - N2106 E11224 TOP FL450 MOV N 10KT NC= VHHK SIGMET 2 VALID 070422/070820 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2142 E11206 - N2230 E11342 - N2242 E11424 - N1930 E11548 - N1806 E11418 - N1942 E11206 - N2142 E11206 TOP FL450 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.

    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 07/Jul/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.7 C
Minimum Air Temperature                     25.8 C
Grass Minimum Temperature                   26.2 C
Relative Humidity                        87 - 97 Percent
Rainfall                                    16.3 mm 
Total rainfall since 1st January          1290.5 mm
Against an average of                     1166.1 mm

Other Stations                Min                  Max
King's Park                  25.6 C               29.1 C
Wong Chuk Hang               26.1 C               30.1 C
Ta Kwu Ling                  25.9 C               30.1 C
Lau Fau Shan                 25.1 C               28.8 C
Tai Po                       25.2 C               28.5 C
Sha Tin                      26.6 C               30.7 C
Tuen Mun                     26.0 C               30.1 C
Tseung Kwan O                25.7 C               29.7 C
Sai Kung                     25.8 C               29.9 C
Cheung Chau                  25.1 C               28.7 C
Chek Lap Kok                 26.8 C               31.5 C
Tsing Yi                     25.9 C               30.4 C
Shek Kong                    25.7 C               30.8 C
Tsuen Wan Ho Koon            24.9 C               27.5 C
Tsuen Wan Shing Mun Valley   25.6 C               29.8 C
Hong Kong Park               25.6 C               29.6 C
Shau Kei Wan                 25.4 C               29.8 C
Kowloon City                 25.5 C               29.5 C
Happy Valley                 26.7 C               31.0 C
Wong Tai Sin                 25.5 C               29.8 C
Stanley                      25.6 C               30.5 C
Kwun Tong                    25.9 C               29.6 C
Sham Shui Po                 26.3 C               30.1 C
Kai Tak Runway Park          26.4 C               29.7 C
Yuen Long Park               25.5 C               29.9 C
Tai Mei Tuk               25.2 C               29.3 C

Duration of sunshine (King's Park):              1.0 H
The mean UV index recorded at King's Park yesterday was 2,
the UV intensity was Low.
The maximum UV index for yesterday was 5.
 

Yesterday's (06 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 06 Jul
     2003copy right image | Important notices | Privacy policy Last revision date: <07 Jul 2017> 

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