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Bulletin issued at 02:02 HKT 14/Sep/2017

At 2 a.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 75 per cent.

Please be reminded that:

The Very Hot Weather Warning is now in force. Very hot weather might cause adverse health effects. Members of the public should take care to avoid heatstroke.

The air temperatures at other places were:

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

Between 0:45 and 1:45 a.m., the rainfall recorded in various regions were:

Yuen Long 0 to 2 mm.

Here is the information on Severe Tropical Storm Doksuri at 2 a.m.:
Location: 15.7 degrees north, 113.8 degrees east.


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


Climatological Information for 14 Sep

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 01:45 HKT 14/Sep/2017

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

A strong northeast monsoon is affecting the south China coastal areas.

At 2 a.m., Severe Tropical Storm Doksuri was centred about 200 kilometres southeast of Xisha. It is forecast to move west-northwest at about 20 kilometres per hour in the general direction of the vicinity of southern Hainan Island and Vietnam and intensify gradually. Meanwhile, Severe Typhoon Talim was centred about 830 kilometres southwest of Kagoshima. It is forecast to move north-northwest at about 14 kilometres per hour across the East China Sea and intensify gradually.

Weather forecast for today

Mainly cloudy with isolated showers. The minimum temperature will be about 28 degrees. Very hot with sunny periods during the day. The maximum temperature will be around 33 degrees. Moderate to fresh east to northeasterly winds, occasionally strong offshore.

Outlook : A few showers on Friday. Mainly fine over the weekend and early next week.


(The above forecast period is valid up to 23:59 HKT today, 14/09/2017; 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 13/Sep/2017

HURRICANE WARNING AREAS: PARACEL AND DANANG.
GALE WARNING AREAS: TAIWAN STRAIT, SCARBOROUGH AND TONKIN.

GENERAL SITUATION AT 130900 UTC:
FOR DETAILS ON TROPICAL STORM DOKSURI (1719), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 131300 UTC:

HONG KONG= E TO NE 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL E TO NE UP TO 2 M. TEMP 28-33 C. =
KWANGTUNG= E TO NE 5-6, OCNL 7. ISOL SHOWERS AND TS. SEA UP TO 4 M. SWELL E TO NE 2 M. =
TAIWAN STRAIT= NE 6-7, UP TO 8 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL NE 2-3 M. =
BASHI= S TO SW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO NE 3 M. =
PRATAS= E TO NE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO NE 2-3 M. =
BALINTANG= S TO SW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO NE 3 M. =
SCARBOROUGH= S TO SE 7-8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL E TO NE 3-5 M. =
PARACEL= CYCLONIC 7-8, UP TO 12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, UP TO 14 M LATER. SWELL E TO NE 3-5 M. =
TONKIN= N TO NE 5-6, 7-8 LATER. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M, 4-6 M LATER. SWELL E TO NE UP TO 2 M. =
DANANG= N TO NE 6-7, UP TO 12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 14 M LATER. SWELL E TO NE 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.


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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 23:30 HKT 13/Sep/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 13 September 2017

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

    Weather Situation:
    A strong northeast monsoon is affecting the south China coastal waters.

    At 11 p.m., Severe Tropical Storm Doksuri with maximum sustained winds of about 90 kilometres per hour near its centre was located at 15.7 degrees north, 114.4 degrees east, it is forecast to move west-northwest at about 20 kilometres per hour in the general direction of the vicinity of southern Hainan Island and Vietnam and intensify gradually. Meanwhile, Severe Typhoon Talim with maximum sustained winds of about 155 kilometres per hour near its centre was located at 25.8 degrees north, 125.3 degrees east, it is forecast to move north-northwest at about 14 kilometres per hour across the East China Sea and intensify gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to northeast force 5 to 6.
    Isolated showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao, Shanwei and South of Hong Kong:
    East to northeast force 5 to 6, occasionally force 7.
    Isolated showers and thunderstorms.
    Moderate to rough seas.

    Shangchuan Dao:
    East to northeast force 6 to 7, occasionally force 8.
    Scattered squally showers and thunderstorms.
    Rough to very rough seas.

    Outlook for the next 48 hours
    East to southeasterly winds of force 7 to 8. Squally showers and thunderstorms.

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

    Waglan Island Wind east-northeast force 6
      Visibility 9 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 20 Kilometres

    Dongsha Wind northeast force 4
      Visibility 10 Kilometres

    Macau Wind east force 4
      Visibility 15 Kilometres

    Xisha Wind north-northeast force 4
      Visibility 6 Kilometres in showers

  • 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 14/SEP/2017
    (Next update at 9:00-9:30 HKT 14/SEP/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 NORTHEAST MONSOON IS AFFECTING THE SOUTH CHINA
     COASTAL AREAS.
     AT 11 P.M. LAST NIGHT, SEVERE TROPICAL STORM
     DOKSURI WAS CENTRED NEAR 15.6 DEGREES NORTH,
     114.3 DEGREES EAST. IT IS FORECAST TO MOVE
     WEST-NORTHWEST AT ABOUT 10 KNOTS IN THE GENERAL
     DIRECTION OF THE VICINITY OF SOUTHERN HAINAN
     ISLAND AND VIETNAM AND INTENSIFY GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  080/10-15
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  080/20-25                            28-34
   B.   2000 FT:  080/20-25                            23
   C.   5000 FT:  090/25                               19
   D.  10000 FT:  080/15                               11
   E.  18000 FT:  090/15                               MS3
   F.  24000 FT:  090/15                               MS13
   G.  30000 FT:  090/10                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH ISOLATED SHOWERS AND
      THUNDERSTORMS. SUNNY PERIODS DURING THE DAY.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT SCT 3500 FT. TEMPO FEW CB 1000 FT
      SCT 1500 FT BKN 5000 FT
   K. VISIBILITY    : 8 KM.  TEMPO 4000 M IN SHOWERS. TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11000 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 2.0-3.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EAST TO NORTHEASTERLY WINDS,
     OCCASIONALLY STRONG OFFSHORE. SUNNY PERIODS WITH
     ISOLATED SHOWERS AND 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 23:25 HKT on 13 Sep 17

    VHHK SIGMET 3 VALID 131130/131530 VHHH- VHHK HONG KONG FIR EMBD TS FCST S OF LINE N1848 E11206 - N1824 E11524 TOP FL420 MOV W 10KT NC= VHHK SIGMET 4 VALID 131530/131930 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1954 E11636 - N1642 E11400 - N1918 E11142 - N2030 E11600 - N1954 E11636 TOP FL420 MOV W 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

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    Bulletin issued at 00:30 HKT 14/Sep/2017


    Tropical Cyclone Warning

    At 131500 UTC, Severe Tropical Storm Doksuri (1719) with central pressure 984 hectopascals was centred within 90 nautical miles of one five point six degrees north (15.6 N) one one four point three degrees east (114.3 E) and is forecast to move west-northwest at about 10 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 50 knots.

    Radius of over 33 knot winds 150 nautical miles.
    Radius of over 47 knot winds 30 nautical miles.
    Radius of over 2 metre waves 240 nautical miles.

    Forecast position and intensity at 141500 UTC
    One seven point zero degrees north (17.0 N)
    One one zero point three degrees east (110.3 E)
    Maximum winds 75 knots.

    Forecast position and intensity at 151500 UTC
    One eight point two degrees north (18.2 N)
    One zero five point five degrees east (105.5 E)
    Maximum winds 65 knots.

    Forecast position and intensity at 161500 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 14/Sep/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     34.0 C
Minimum Air Temperature                     28.3 C
Grass Minimum Temperature                   26.6 C
Relative Humidity                        56 - 82 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2348.7 mm
Against an average of                     2055.1 mm

Other Stations                Min                  Max
King's Park                  27.9 C               33.0 C
Wong Chuk Hang               28.6 C               33.3 C
Ta Kwu Ling                  25.7 C               33.6 C
Lau Fau Shan                 26.0 C               33.8 C
Tai Po                       26.6 C               31.7 C
Sha Tin                      27.8 C               33.3 C
Tuen Mun                     26.4 C               33.4 C
Tseung Kwan O                27.5 C               34.0 C
Sai Kung                     28.2 C               31.9 C
Cheung Chau                  27.3 C               33.7 C
Chek Lap Kok                 28.8 C               35.0 C
Shek Kong                    26.6 C               33.6 C
Tsuen Wan Ho Koon            26.1 C               32.4 C
Tsuen Wan Shing Mun Valley   27.1 C               32.3 C
Hong Kong Park               27.7 C               32.6 C
Shau Kei Wan                 27.7 C               32.7 C
Kowloon City                 27.7 C               33.0 C
Happy Valley                 28.2 C               34.1 C
Wong Tai Sin                 27.0 C               33.9 C
Stanley                      28.3 C               33.3 C
Kwun Tong                    27.7 C               32.2 C
Sham Shui Po                 27.8 C               33.6 C
Kai Tak Runway Park          28.7 C               32.6 C
Yuen Long Park               27.2 C               34.0 C
Tai Mei Tuk               26.8 C               32.4 C

Duration of sunshine (King's Park):              8.6 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.
Sea surface temperature (Waglan Island):        29.0 C 

Yesterday's (13 Sep 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                       0.13
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 13 Sep
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