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Bulletin issued at 18:02 HKT 10/Jul/2018

At 6 p.m. at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 70 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.8. The intensity of UV radiation was low.

The air temperatures at other places were:

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


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


Climatological Information for 10 Jul

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 17:45 HKT 10/Jul/2018

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

The subsiding air in the outer circulation of Super Typhoon Maria is bringing generally fine weather to Guangdong.

At 4 p.m., Super Typhoon Maria was centred about 350 kilometres east of Taibei. It is forecast to move west-northwest at about 30 kilometres per hour skirting the northern part of Taiwan and towards the vicinity of Fujian and Zhejiang.

Weather forecast for tonight and tomorrow

Mainly fine. The minimum temperature will be about 28 degrees tomorrow. Very hot with some haze during the day. The maximum temperature will be around 33 degrees in the urban areas, and a couple of degrees higher in the New Territories. Moderate easterly winds. Light winds tomorrow.

Outlook : Sunny periods on Thursday. Squally showers in the following few days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 11/07/2018; 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/Jul/2018

HURRICANE WARNING AREA: TAIWAN STRAIT.
GALE WARNING AREAS: BASHI AND BALINTANG.

GENERAL SITUATION AT 092100 UTC:
AN EASTERLY AIRSTREAM IS GENERALLY AFFECTING THE FORECAST AREAS. SUPER TYPHOON MARIA (1808) 925 HPA 24N 128E WNW 16KT INTST NC.

MARINE FORECAST FOR 24 HOURS FROM 100100 UTC:

HONG KONG= E TO NE 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. TEMP 32-28 C. =
KWANGTUNG= E TO NE 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL S UP TO 2 M. =
TAIWAN STRAIT= NE 7-8, SW 11-12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, 12-14 M LATER. SWELL NE UP TO 3-5 M. =
BASHI= N 6-7, W TO SW 8-9 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M, 6-8 M LATER. SWELL E TO NE 3-5 M. =
PRATAS= E TO SE 5-6, SW 5-6 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E 2 M. =
BALINTANG= NE 6-7, W TO SW 7-8 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M LATER. SWELL E TO NE 3-5 M. =
SCARBOROUGH= S TO SW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2 M, NE 2-3 M. =
PARACEL= S TO SE 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 2 M. =
TONKIN= E TO NE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= W TO NW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 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
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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 16:30 HKT 10/Jul/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 10 July 2018

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

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

    At 4 p.m., Super Typhoon Maria with maximum sustained winds of about 195 kilometres per hour near its centre was located near 24.9 degrees north, 125.0 degrees east. It is forecast to move west-northwest at about 30 kilometres per hour skirting the northern part of Taiwan and towards the vicinity of Fujian and Zhejiang.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to northeast force 4 to 5, becoming southeast force 3 to 4 later.
    Isolated showers, some haze later.
    Slight to moderate seas.

    Nan'ao:
    East to northeast force 6 to 7, becoming southwest force 8 later.
    Isolated squally showers and thunderstorms.
    Rough seas, becoming very rough later.

    Shanwei:
    East to northeast force 6 to 7, becoming southwest force 6 to 7 later.
    Isolated showers and thunderstorms.
    Rough seas.

    South of Hong Kong and Shangchuan Dao:
    East force 5 to 6, becoming southeast force 4 to 5 later.
    Isolated showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    South to southeasterly winds of force 6 to 7. Isolated squally showers and thunderstorms.

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

    Waglan Island Wind east force 3
      Visibility 33 Kilometres

    Shantou Wind east-southeast force 2
      Visibility 30 Kilometres

    Dongsha Wind east-northeast force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 5

    Macau Wind east force 2
      Visibility 21 Kilometres

    Xisha Wind southwest force 3
      Visibility 27 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 10/JUL/2018
    (Next update at 01:30 HKT 11/JUL/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A BROAD AREA OF LOW PRESSURE 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:  080/5-10
       OFFSHORE:  090/15, OCNL 20 AT FIRST             31-28
   B.   2000 FT:  110/10-15                            25
   C.   5000 FT:  070/15                               20
   D.  10000 FT:  090/15                               12
   E.  18000 FT:  080/15                               MS2
   F.  24000 FT:  090/20                               MS12
   G.  30000 FT:  090/20                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT.
   K. VISIBILITY    : 10 KM.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11200 FT
   M. TURBULENCE    : MOD OFFSHORE.
   N. SEA STATE     : 1.0-2.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT WINDS.  MAINLY FINE.  SOME HAZE DURING THE
     DAY.=

    ===================================================================
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 11:48 HKT on 10 Jul 18

    VHHK SIGMET 1 VALID 100350/100750 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1742 E11448 - N1642 E11400 - N1930 E11130 - N1948 E11130 - N1948 E11212 - N1742 E11448 TOP FL450 MOV W 07KT NC= VHHK SIGMET 5 VALID 092350/100350 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1736 E11442 - N1642 E11400 - N1848 E11206 - N1900 E11324 - N1736 E11442 TOP FL400 STNR 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

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    Bulletin issued at 18:30 HKT 10/Jul/2018


    Tropical Cyclone Warning

    Super Typhoon Maria (1808) has entered the area of responsibility of the Hong Kong Observatory.

    At 100900 UTC, Super Typhoon Maria (1808) with central pressure 950 hectopascals was centred within 30 nautical miles of two five point zero degrees north (25.0 N) one two four point eight degrees east (124.8 E) and is forecast to move west-northwest at about 16 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 100 knots.

    Radius of over 33 knot winds 240 nautical miles.
    Radius of over 47 knot winds 120 nautical miles.
    Radius of over 63 knot winds 60 nautical miles.
    Radius of over 2 metre waves 300 nautical miles.

    Forecast position and intensity at 110900 UTC
    Two seven point zero degrees north (27.0 N)
    One one seven point five degrees east (117.5 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 112100 UTC
    Dissipated over land.



    The Hong Kong Observatory's tropical cyclone warnings for shipping are issued about one and a half hours after the time of observation. They incorporate additional information derived from surface and upper-air data and may therefore be slightly different from the real-time satellite or radar-based positions given in the hourly bulletins for public.

    While the forecast positions and track indicate the most likely future path of the tropical cyclone, they may deviate from the actual path taken by the storm.

    Tropical Cyclone Track
    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/Jul/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.8 C
Minimum Air Temperature                     25.9 C
Grass Minimum Temperature                   25.9 C
Relative Humidity                        70 - 93 Percent
Rainfall                                    11.3 mm 
Total rainfall since 1st January           696.2 mm
Against an average of                     1191.9 mm

Other Stations                Min                  Max
King's Park                  25.4 C               30.8 C
Wong Chuk Hang               25.8 C               31.4 C
Ta Kwu Ling                  25.8 C               31.9 C
Lau Fau Shan                 25.1 C               31.9 C
Tai Po                       25.5 C               30.1 C
Sha Tin                      26.5 C               31.6 C
Tuen Mun                     26.3 C               32.7 C
Tseung Kwan O                24.7 C               31.4 C
Sai Kung                     25.6 C               30.3 C
Cheung Chau                  24.1 C               30.3 C
Chek Lap Kok                 27.6 C               33.8 C
Tsing Yi                     26.1 C               32.0 C
Shek Kong                    26.7 C               31.8 C
Tsuen Wan Ho Koon            25.1 C               30.3 C
Tsuen Wan Shing Mun Valley   26.0 C               30.6 C
Hong Kong Park               24.5 C               30.5 C
Shau Kei Wan                 24.3 C               29.8 C
Kowloon City                 25.2 C               31.4 C
Happy Valley                 25.4 C               31.9 C
Wong Tai Sin                 25.8 C               30.8 C
Stanley                      25.0 C               31.2 C
Kwun Tong                    25.5 C               30.6 C
Sham Shui Po                 26.0 C               32.3 C
Kai Tak Runway Park          25.1 C               30.4 C
Yuen Long Park               26.7 C               32.8 C
Tai Mei Tuk               25.3 C               31.3 C

Duration of sunshine (King's Park):              7.0 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 12.
 

Yesterday's (09 Jul 2018) 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                             0.08
Kat O                               0.10
Yuen Ng Fan                         0.11
Tai Mei Tuk                         0.11
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.08
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 in the
past, the hourly mean ambient gamma radiation dose rate may
vary between 0.06 and 0.3 microsievert per hour. (1
microsievert = 0.000001 sievert = 0.001 millisievert)

    2. Temporal variations are generally caused by changes in
meteorological conditions such as rainfall, wind and
barometric pressure.

    3. Spatial variations are generally caused by differences in
the radioactive content of local rock and soil.

    4. The data displayed is provisional. Only limited data
validation has been carried out.
    Climatological Information for 09 Jul
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