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Bulletin issued at 23:02 HKT 13/Sep/2018

At 11 p.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 87 per cent.

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


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


Climatological Information for 13 Sep

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 23:15 HKT 13/Sep/2018

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

Tropical Storm Barijat moved across Leizhou Peninsula and weakened gradually today, and dissipated over inland Guangxi afterwards. Besides, the outer subsiding air of Super Typhoon Mangkhut affected southeastern China. Locally, there were sunny intervals, and a few showers at first. Winds moderated gradually.

At 11 p.m., Super Typhoon Mangkhut was centred about 790 kilometres east of Manila. It is forecast to move west-northwest at about 22 kilometres per hour towards the vicinity of Luzon. The outer subsiding air of Mangkhut is expected to bring generally fine and very hot weather to Guangdong in the next couple of days.

Weather forecast for Hong Kong (Friday, 14 Sep 2018)

Mainly fine apart from isolated showers. Very hot with temperatures ranging between 27 and 33 degrees. Moderate east to northeasterly winds, fresh offshore at first.

Outlook : Very hot on Saturday. Frequent heavy rain and squalls on Sunday and Monday. Seas will be very rough with swells.


(The above forecast period is valid up to 23:59 HKT tomorrow, 14/09/2018; 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 21:00 HKT 13/Sep/2018

GALE WARNING AREAS: TAIWAN STRAIT, BASHI, BALINTANG AND SCARBOROUGH.

GENERAL SITUATION AT 130900 UTC:
SUPER TYPHOON MANGKHUT (1822) 905 HPA 15N 130E WNW 12KT INTST NC.

MARINE FORECAST FOR 24 HOURS FROM 131300 UTC:

HONG KONG= E TO NE 4-5, OCNL 6. ISOLATED SHOWERS. SEA 2-3 M. SWELL E 2 M. TEMP 27-33 C. =
KWANGTUNG= E TO NE 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E 2-3 M. =
TAIWAN STRAIT= NE 5-6, UP TO 8 LATER. ISOL SHOWERS AND TS. SEA 2-3 M, UP TO 6 M LATER. =
BASHI= NE 5-6, UP TO 8 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS LATER. SEA 2-3 M, UP TO 6 M LATER. SWELL E 3-5 M. =
PRATAS= E TO NE 5-6, UP TO 7 LATER. DOWN TO 2000 M IN SCT HEAVY SQUALLY SHOWERS AND TS LATER. SEA 2-3 M, UP TO 4 M LATER. SWELL E 2-3 M. =
BALINTANG= NE 5-6, UP TO 8 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS LATER. SEA 2-3 M, UP TO 6 M LATER. SWELL E 3-5 M. =
SCARBOROUGH= N TO NE 4-5, UP TO 8 LATER. DOWN TO 2000 M IN SCT HEAVY SQUALLY SHOWERS AND TS LATER. SEA 2 M, UP TO 6 M LATER. =
PARACEL= E TO NE 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2 M. SWELL E UP TO 2 M. =
TONKIN= E TO NE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2 M. =
DANANG= E TO NE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 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

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    Bulletin issued at 23:30 HKT 13/Sep/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 13 September 2018

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

    Weather Situation:
    At 11 p.m., Super Typhoon Mangkhut with maximum sustained winds of about 240 kilometres per hour near its centre was located near 15.0 degrees north, 128.3 degrees east. It is forecast to move west-northwest at about 22 kilometres per hour towards the vicinity of Luzon.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to northeast force 4 to 5.
    A few showers.
    Moderate to rough seas.

    Nan'ao and Shanwei:
    East to northeast force 5 to 6.
    Moderate to rough seas.

    South of Hong Kong:
    East to northeast force 5 to 6.
    Isolated squally showers and thunderstorms.
    Moderate to rough seas.

    Shangchuan Dao:
    East to northeast force 4 to 5, occasionally force 6.
    Isolated squally showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    North to northeasterly winds of force 7 to 8, becoming cyclonic winds of force 11 to 12 later. Frequent heavy squally showers and thunderstorms later.

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

    Waglan Island Wind east-northeast force 3

    Shantou Wind east-southeast force 2
      Visibility 30 Kilometres

    Huangmaozhou Wind east-southeast force 5

    Xisha Wind east force 2
      Visibility 30 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 20:00 HKT 13/SEP/2018
    (Next update at 01:30 HKT 14/SEP/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     TROPICAL DEPRESSION BARIJAT HAS DISSIPATED OVER
     INLAND GUANGXI.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 2000 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  090/10-15
       OFFSHORE:  100/15-20, OCNL 25 AT FIRST          29-27
   B.   2000 FT:  100/15-20, OCNL 25 AT FIRST          23
   C.   5000 FT:  110/20-25                            16
   D.  10000 FT:  100/15                               11
   E.  18000 FT:  120/15                               MS2
   F.  24000 FT:  100/25                               MS13
   G.  30000 FT:  080/20                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY PERIODS WITH ISOLATED SHOWERS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT SCT 5000 FT.
   K. VISIBILITY    : 10 KM. TEMPO 4000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 10600 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND NEAR HILLS
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE EAST TO NORTHEASTERLY WINDS. 
     MAINLY FINE APART FROM ISOLATED SHOWERS.=

    ===================================================================
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.

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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 17:32 HKT on 13 Sep 18

    VHHK SIGMET 2 VALID 130540/130940 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2124 E11636 - N2000 E11600 - N2048 E11130 - N2130 E11130 - N2206 E11254 - N2124 E11636 TOP FL400 MOV WNW 10KT NC= VHHK SIGMET 3 VALID 130940/131340 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1954 E11636 - N1830 E11530 - N2018 E11342 - N1930 E11130 - N2118 E11130 - N2200 E11506 - N1954 E11636 TOP FL400 MOV WNW 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 18:30 HKT 13/Sep/2018


    Tropical Cyclone Warning

    At 130900 UTC, Tropical Depression Barijat (1823) has weakened into an area of low pressure.

    No further warnings on this area of low pressure will be issued by the Hong Kong Observatory unless regeneration takes place.



    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 13/Sep/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.7 C
Minimum Air Temperature                     26.9 C
Grass Minimum Temperature                   25.6 C
Relative Humidity                        73 - 84 Percent
Rainfall                                      Trace 
Total rainfall since 1st January          1673.7 mm
Against an average of                     2038.6 mm

Other Stations                Min                  Max
King's Park                  26.3 C               28.6 C
Wong Chuk Hang               26.2 C               28.8 C
Ta Kwu Ling                  25.8 C               31.9 C
Lau Fau Shan                 25.6 C               30.5 C
Tai Po                       26.3 C               28.9 C
Sha Tin                      25.8 C               29.7 C
Tuen Mun                     26.4 C               30.3 C
Tseung Kwan O                24.9 C               28.3 C
Sai Kung                     25.9 C               28.8 C
Cheung Chau                  25.6 C               28.3 C
Chek Lap Kok                 26.5 C               31.1 C
Tsing Yi                     26.4 C               29.8 C
Shek Kong                    25.9 C               30.0 C
Tsuen Wan Ho Koon            24.9 C               28.2 C
Tsuen Wan Shing Mun Valley   25.8 C               29.5 C
Hong Kong Park               25.6 C               28.1 C
Shau Kei Wan                 25.4 C               29.1 C
Kowloon City                 25.3 C               28.9 C
Happy Valley                 26.5 C               29.2 C
Wong Tai Sin                 25.8 C               28.6 C
Stanley                      26.0 C               28.4 C
Kwun Tong                    25.8 C               28.0 C
Sham Shui Po                 26.0 C               29.6 C
Kai Tak Runway Park          26.8 C               28.8 C
Yuen Long Park               26.1 C               31.8 C
Tai Mei Tuk               25.7 C               29.4 C

Duration of sunshine (King's Park):              1.2 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 8.
 

Yesterday's (12 Sep 2018) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 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                           0.09
Tap Mun                             0.09
Kat O                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.13
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 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 12 Sep
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