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Bulletin issued at 17:02 HKT 12/Nov/2017

At 5 p.m. at the Hong Kong Observatory the air temperature was 21 degrees Celsius and the relative humidity 95 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.1. The intensity of UV radiation was low.

The air temperatures at other places were:

King's Park 21 degrees;
Wong Chuk Hang 21 degrees;
Ta Kwu Ling 22 degrees;
Lau Fau Shan 22 degrees;
Tai Po 21 degrees;
Sha Tin 22 degrees;
Tuen Mun 22 degrees;
Sai Kung 21 degrees;
Cheung Chau 21 degrees;
Chek Lap Kok 23 degrees;
Tsing Yi 22 degrees;
Shek Kong 22 degrees;
Tsuen Wan Ho Koon 21 degrees;
Tsuen Wan Shing Mun Valley 21 degrees;
Hong Kong Park 21 degrees;
Shau Kei Wan 21 degrees;
Kowloon City 21 degrees;
Happy Valley 21 degrees;
Wong Tai Sin 21 degrees;
Stanley 21 degrees;
Kwun Tong 21 degrees;
Sham Shui Po 21 degrees;
Kai Tak Runway Park 22 degrees;
Tai Mei Tuk 21 degrees.

Between 3:45 and 4:45 p.m., the rainfall recorded in various regions were:

Islands District 0 to 1 mm;
North District 0 to 1 mm;
Tai Po 0 to 1 mm.

Here is the information on Tropical Depression Haikui at 4 p.m.:
Location: 17.4 degrees north, 112.1 degrees east.


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


Climatological Information for 12 Nov

Regional Weather in Hong Kong

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Bulletin updated at 16:45 HKT 12/Nov/2017

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

The northeast monsoon is affecting the coast of southeastern China. Meanwhile, a broad band of clouds is covering the region. Locally, more than 10 millimetres of rainfall were recorded over many places in the afternoon.

At 4 p.m., Tropical Depression Haikui was centred about 70 kilometres north-northwest of Xisha. It is forecast to move west-southwest at about 12 kilometres per hour across the central part of the South China Sea and further weaken.

Weather forecast for tonight and tomorrow

Cloudy with a few rain patches. Temperatures will range between 22 and 25 degrees tomorrow. Moderate to fresh east to northeasterly winds, occasionally strong offshore at first.

Outlook : Mainly cloudy in the following couple of days. Brighter in the latter part of this week.


(The above forecast period is valid up to 23:59 HKT tomorrow, 13/11/2017; 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 12/Nov/2017

GALE WARNING AREAS: HONG KONG, KWANGTUNG, TAIWAN STRAIT, PRATAS AND PARACEL.

GENERAL SITUATION AT 112100 UTC:
FOR DETAILS ON TROPICAL STORM HAIKUI (1724), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS. AN INTENSE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 120100 UTC:

HONG KONG= E 6-7, OCNL 8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL NE 2 M. TEMP 25-22 C. =
KWANGTUNG= E TO NE 6-7, OCNL 8. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL NE 2-3 M, SE 2-3 M. =
TAIWAN STRAIT= NE 6-7, 8 AT FIRST. RAIN PATCHES. SEA 3-4 M, 6 M AT FIRST. SWELL NE 2-3 M. =
BASHI= E TO NE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS IN W. SEA 3-4 M. SWELL NE 3-4 M. =
PRATAS= E TO NE 6-7, OCNL 8 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M AT FIRST. SWELL NE 3-4 M. =
BALINTANG= E TO NE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS IN W. SEA 3-4 M. SWELL NE 3-4 M. =
SCARBOROUGH= E TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL NE 3-4 M. =
PARACEL= CYCLONIC UP TO 9, E TO SE 7 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 8 M, 4 M LATER. SWELL NE 3-4 M, SE 3 M. =
TONKIN= NE 5-6. RAIN PATCHES. SEA 2-3 M. SWELL NE 2 M. =
DANANG= NE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS LATER. SEA 3-4 M. SWELL NE 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.


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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 12/Nov/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 12 November 2017

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

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

    At 4 p.m., Tropical Depression Haikui with maximum sustained winds of about 45 kilometres per hour near its centre was located at 17.4 degrees north, 112.1 degrees east. It is forecast to move west-southwest at about 12 kilometres per hour across the central part of the South China Sea and further weaken.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 6 to 7.
    Isolated squally showers and thunderstorms.
    Rough seas.

    Nan'ao and Shanwei:
    East to northeast force 6 to 7.
    Scattered squally showers and thunderstorms.
    Rough seas.

    South of Hong Kong and 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 northeasterly winds of force 6. Isolated squally showers and thunderstorms.

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

    Waglan Island Wind east-northeast force 5
      Visibility 6 Kilometres

    Shantou Wind northeast force 2
      Visibility 24 Kilometres

    Dongsha Wind east-northeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 7

    Macau Wind east force 2
      Visibility 1500 Metres in showers

    Xisha Wind west force 2
      Visibility 17 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 12/NOV/2017
    (Next update at 01:30 HKT 13/NOV/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE NORTHEAST MONSOON IS AFFECTING THE SOUTH
     CHINA COASTAL WATERS.
     AT 4 P.M., TROPICAL DEPRESSION HAIKUI WAS
     LOCATED AT 17.4 DEGREES NORTH, 112.1 DEGREES
     EAST. IT IS FORECAST TO MOVE WEST-SOUTHWEST AT
     ABOUT 6 KNOTS ACROSS THE CENTRAL PART OF THE
     SOUTH CHINA SEA AND FURTHER WEAKEN.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  080/10-15
       OFFSHORE:  070/20-25, OCNL 30                   23-22
   B.   2000 FT:  080/20-25                            19
   C.   5000 FT:  090/10-15                            16
   D.  10000 FT:  210/10                               9
   E.  18000 FT:  270/15                               MS6
   F.  24000 FT:  260/30                               MS15
   G.  30000 FT:  250/35                               MS30
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      3000-3700FT.
   I. WEATHER       : 
      CLOUDY WITH A FEW RAIN PATCHES. LOCALIZED MIST
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 600 FT SCT 2000 FT BKN 5000 FT
   K. VISIBILITY    : 8 KM. TEMPO 4000 M IN RAIN OR MIST.
   L. 0 DEG. C LEVEL: 15500 FT      10 DEG. C LEVEL(S) : 9400 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 3.0-4.5 M     SEA TEMPERATURE    : 24 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE EASTERLY WINDS, FRESH OFFSHORE. CLOUDY
     WITH A FEW RAIN PATCHES.=

    ===================================================================
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 17:00 HKT on 12 Nov 17

    VHHK SIGMET 2 VALID 120500/120900 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1642 E11400 - N1854 E11200 - N2130 E11600 - N2206 E11730 - N2100 E11730 TOP FL420 MOV W 05KT NC= VHHK SIGMET 3 VALID 120900/121300 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1642 E11400 - N1906 E11154 - N1942 E11318 - N2230 E11730 - N2100 E11730 TOP FL420 MOV W 05KT WKN=

    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 15:30 HKT 12/Nov/2017


    Tropical Cyclone Warning

    At 120600 UTC, Tropical Depression Haikui (1724) with central pressure 1000 hectopascals was centred within 60 nautical miles of one seven point five degrees north (17.5 N) one one two point two degrees east (112.2 E) and is forecast to move west-southwest at about 6 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 25 knots.

    Radius of over 2 metre waves 60 nautical miles.

    Forecast position and intensity at 130600 UTC
    Dissipated over sea.



    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 12/Nov/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     26.5 C
Minimum Air Temperature                     23.4 C
Grass Minimum Temperature                   22.8 C
Relative Humidity                        71 - 82 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2541.5 mm
Against an average of                     2349.5 mm

Other Stations                Min                  Max
King's Park                  22.8 C               27.4 C
Wong Chuk Hang               23.5 C               27.5 C
Ta Kwu Ling                  21.0 C               29.1 C
Tai Po                       22.2 C               26.3 C
Sha Tin                      22.5 C               27.6 C
Tuen Mun                     22.5 C               28.1 C
Tseung Kwan O                22.3 C               27.2 C
Sai Kung                     23.2 C               26.6 C
Cheung Chau                  22.7 C               27.6 C
Chek Lap Kok                 24.1 C               29.4 C
Tsing Yi                     23.7 C               27.7 C
Shek Kong                    21.8 C               28.3 C
Tsuen Wan Ho Koon            21.6 C               26.3 C
Tsuen Wan Shing Mun Valley   22.0 C               27.9 C
Hong Kong Park               23.3 C               26.4 C
Shau Kei Wan                 22.7 C               26.1 C
Kowloon City                 22.7 C               27.5 C
Happy Valley                 23.3 C               27.7 C
Wong Tai Sin                 22.7 C               28.2 C
Stanley                      22.9 C               26.8 C
Kwun Tong                    22.5 C               26.4 C
Sham Shui Po                 23.7 C               27.7 C
Kai Tak Runway Park          23.6 C               26.7 C
Tai Mei Tuk               22.4 C               28.3 C

Duration of sunshine (King's Park):              1.5 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 4.
Sea surface temperature (Waglan Island):        24.5 C 

Yesterday's (11 Nov 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 to
0.15 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                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.09
King's Park                         0.15
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 11 Nov
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