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Bulletin issued at 12:02 HKT 14/Sep/2018

At noon at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 71 per cent.
During the past hour the mean UV Index recorded at King's Park was 6. The intensity of UV radiation was high.

According to the present forecast track, Super Typhoon Mangkhut will move across the northern part of Luzon into the South China Sea on Saturday. Its track and wind strength near the centre may change under the influence of the terrain of Luzon, but it may maintain the strength of a super typhoon after entering the South China Sea. Despite the uncertainties in the subsequent track of Mangkhut and its distance from Hong Kong, Mangkhut's extensive circulation will pose a threat to the coast of Guangdong. As there will be swells in Hong Kong waters on Saturday, members of the public should stay away from the shoreline and not to engage in water sports. Weather in Hong Kong will deteriorate significantly on Sunday. Winds will strengthen abruptly with frequent heavy rain and squalls. Seas will be very rough with swells. Heavy rain and storm surge may cause flooding and backflow of seawater in low-lying coastal areas. Mangkhut will depart from Hong Kong on Monday. Local winds will moderate gradually later but there will still be squally heavy showers. Members of the public should complete all precautionary measures as soon as possible.

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 31 degrees;
Wong Chuk Hang 32 degrees;
Ta Kwu Ling 31 degrees;
Lau Fau Shan 30 degrees;
Tai Po 29 degrees;
Sha Tin 31 degrees;
Tuen Mun 31 degrees;
Tseung Kwan O 31 degrees;
Sai Kung 30 degrees;
Cheung Chau 28 degrees;
Chek Lap Kok 30 degrees;
Tsing Yi 31 degrees;
Shek Kong 32 degrees;
Tsuen Wan Ho Koon 30 degrees;
Tsuen Wan Shing Mun Valley 31 degrees;
Hong Kong Park 31 degrees;
Shau Kei Wan 31 degrees;
Kowloon City 32 degrees;
Happy Valley 32 degrees;
Wong Tai Sin 31 degrees;
Stanley 30 degrees;
Kwun Tong 31 degrees;
Sham Shui Po 32 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 31 degrees;
Tai Mei Tuk 31 degrees.

No rainfall was recorded at the Hong Kong Observatory between midnight last night and midday today.


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 11:45 HKT 14/Sep/2018

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

The outer subsiding air of Super Typhoon Mangkhut is bringing very hot weather to Guangdong.

At noon, Mangkhut was centred about 570 kilometres east-northeast of Manila. It is forecast to move west-northwest at about 25 kilometres per hour towards the vicinity of Luzon.

Weather forecast for this afternoon and tonight

Mainly fine and very hot apart from isolated showers. Moderate northeasterly winds.

Outlook : Winds will strengthen gradually tomorrow. There will be swells. Weather will be adverse with very rough seas on Sunday. There will still be squally heavy showers on Monday. Winds will weaken gradually later.


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

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

GENERAL SITUATION AT 132100 UTC:
SUPER TYPHOON MANGKHUT (1822) 905 HPA 16N 128E WNW 14KT INTST NC.

MARINE FORECAST FOR 24 HOURS FROM 140100 UTC:

HONG KONG= E TO NE 4-5, OCNL 6. ISOLATED SHOWERS. SEA UP TO 3 M. SWELL E 2 M. TEMP 33-27 C. =
KWANGTUNG= E TO NE 5-6, UP TO 8 IN E LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 6 M IN E LATER. SWELL E 2-3 M. =
TAIWAN STRAIT= NE 6-7, OCNL 8. ISOL SHOWERS AND TS. SEA UP TO 6 M. SWELL E 3 M IN S. =
BASHI= E TO NE 6-7, UP TO 9 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS LATER. SEA 3-4 M, UP TO 8 M LATER. SWELL E 5-7 M. =
PRATAS= E TO NE 5-6, UP TO 8 LATER. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS LATER. SEA 2-3 M, UP TO 6 M LATER. SWELL E 3-5 M. =
BALINTANG= E TO NE 7-8, UP TO 12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS LATER. SEA 4-6 M, UP TO 14 M LATER. SWELL E 5-7 M. =
SCARBOROUGH= N TO NE 7-8, UP TO 12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS LATER. SEA 4-6 M, UP TO 14 M LATER. SWELL NE 3 M. =
PARACEL= N TO NE 4-5, UP TO 7 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2 M, UP TO 4 M LATER. SWELL E 2-3 M. =
TONKIN= N TO NE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2 M. =
DANANG= N TO NE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2 M. SWELL E 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.


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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 14/Sep/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 p.m. on 14 September 2018

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

    Weather Situation:
    At noon, Super Typhoon Mangkhut with maximum sustained winds of about 240 kilometres per hour near its centre was located near 16.3 degrees north, 126.0 degrees east. It is forecast to move west-northwest at about 25 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, up to force 6 later.
    A few showers.
    Moderate seas, becoming rough later.

    Nan'ao and Shanwei:
    East to northeast force 5 to 6, up to force 8 later.
    Moderate to rough seas, becoming very rough later.

    South of Hong Kong:
    East to northeast force 5 to 6, up to force 7 later.
    Moderate to rough seas.

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

    Outlook for the next 48 hours
    Northeasterly winds of force 8 to 9, becoming cyclonic winds of force 12. Frequent heavy squally showers and thunderstorms later.

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

    Waglan Island Wind northeast force 2
      Visibility 20 Kilometres

    Shantou Wind east-southeast force 1
      Visibility 30 Kilometres

    Huangmaozhou Wind east force 3

    Xisha Wind north force 2
      Visibility 30 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 12:30 HKT 14/SEP/2018
    (Next update at 17:30 HKT 14/SEP/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE OUTER SUBSIDING AIR OF SUPER TYPHOON
     MANGKHUT IS AFFECTING SOUTHEASTERN CHINA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1300 TO 2300 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  080/10
       OFFSHORE:  080/10-15                            33-28
   B.   2000 FT:  080/10-15                            23
   C.   5000 FT:  060/20                               19
   D.  10000 FT:  080/15                               11
   E.  18000 FT:  070/20                               MS2
   F.  24000 FT:  060/20                               MS13
   G.  30000 FT:  080/25                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE APART FROM ISOLATED SHOWERS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT.
   K. VISIBILITY    : 10 KM. TEMPO 4000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 10400, 11000, 11800 FT
   M. TURBULENCE    : NIL
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTHEASTERLY WINDS, FRESH OFFSHORE.
     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 14/Sep/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     30.3 C
Minimum Air Temperature                     26.3 C
Grass Minimum Temperature                   26.1 C
Relative Humidity                        74 - 92 Percent
Rainfall                                     2.5 mm 
Total rainfall since 1st January          1676.2 mm
Against an average of                     2055.1 mm

Other Stations                Min                  Max
King's Park                  26.1 C               30.1 C
Wong Chuk Hang               26.2 C               30.1 C
Ta Kwu Ling                  25.7 C               31.3 C
Lau Fau Shan                 25.3 C               30.5 C
Tai Po                       25.7 C               29.1 C
Sha Tin                      25.9 C               30.5 C
Tuen Mun                     26.3 C               31.3 C
Tseung Kwan O                25.8 C               29.6 C
Sai Kung                     26.4 C               28.8 C
Cheung Chau                  25.3 C               29.0 C
Chek Lap Kok                 26.2 C               32.2 C
Tsing Yi                     26.4 C               30.4 C
Shek Kong                    26.1 C               31.1 C
Tsuen Wan Ho Koon            25.1 C               29.7 C
Tsuen Wan Shing Mun Valley   26.1 C               30.1 C
Hong Kong Park               25.7 C               29.0 C
Shau Kei Wan                 25.3 C               28.2 C
Kowloon City                 25.6 C               30.6 C
Happy Valley                 26.6 C               30.5 C
Wong Tai Sin                 26.1 C               30.0 C
Stanley                      25.7 C               29.3 C
Kwun Tong                    25.7 C               29.6 C
Sham Shui Po                 26.2 C               31.0 C
Kai Tak Runway Park          26.1 C               29.3 C
Yuen Long Park               26.4 C               31.4 C
Tai Mei Tuk               25.9 C               29.2 C

Duration of sunshine (King's Park):              5.5 H
The mean UV index recorded at King's Park yesterday was 3,
the UV intensity was Moderate.
The maximum UV index for yesterday was 8.
Sea surface temperature (Waglan Island):        26.8 C 

Yesterday's (13 Sep 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                           0.09
Tap Mun                             0.08
Kat O                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.11
Sha Tau Kok                         0.10
Kwun Tong                           0.12
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 13 Sep
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