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Bulletin issued at 00:02 HKT 15/Sep/2016

At midnight at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 64 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.

The air temperatures at other places were:

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

Here is the information on Severe Typhoon Meranti:
Location: 23.8 degrees north, 118.5 degrees east; Maximum sustained wind near its centre: 175 km/h.


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


Climatological Information for 15 Sep

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


Local Weather Forecast
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Bulletin updated at 00:00 HKT 15/Sep/2016

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

The outer subsiding air associated with Tropical Cyclone Meranti affected the coast of Guangdong yesterday. Locally, it was mainly fine. The weather was very hot and dry in the afternoon. Temperatures over the territory generally rose to about 33 degrees. Besides, Meranti weakened from a super typhoon into a severe typhoon last night. It is expected to make landfall in the vicinity of Xiamen in the small hours today. The weather will become brighter gradually over the coast of Guangdong in the next couple of days.

Weather forecast for Hong Kong (Thursday, 15 Sep 2016)

Mainly cloudy. Sunny intervals during the day. There will be a few showers and isolated thunderstorms later. Temperatures will range between 27 and 32 degrees. Moderate to fresh west to northwesterly winds, occasionally strong offshore and on high ground at first.

Outlook : Sunny periods and a few showers in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 15/09/2016; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

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MARINE FORECAST
Traditional Chinese Simplified Chinese

Marine Forecast

Weather Information for the Marine Community

Bulletin issued at 21:00 HKT 14/Sep/2016

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

GENERAL SITUATION AT 140900 UTC:
FOR DETAILS ON SUPER TYPHOON MERANTI (1614), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 141300 UTC:

HONG KONG= W TO NW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SE UP TO 2 M. TEMP 26-31 C. =
KWANGTUNG= W TO NW 5-6, CYCLONIC UP TO 12 IN E. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS IN E. SEA 2-3 M, UP TO 14 M IN E. SWELL E TO NE 3 M, UP TO 7 M IN E. =
TAIWAN STRAIT= CYCLONIC 12, S TO SE 8-9 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 14 M, 6-8 M LATER. SWELL S TO SW 6 M. =
BASHI= S TO SW 10-11, OCNL 12 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 14 M AT FIRST. SWELL E TO NE 5-7 M, S TO SW 5-7 M. =
PRATAS= W TO SW 8-9, OCNL 10 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 10 M AT FIRST. SWELL E TO NE 5 M, SW 5-7 M. =
BALINTANG= S TO SW 6-7, OCNL 8 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M AT FIRST. SWELL E TO NE 5 M, S TO SW 5-7 M. =
SCARBOROUGH= SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2-3 M. =
PARACEL= W TO NW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SW 2 M. =
TONKIN= N TO NW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= W TO NW 4-5. ISOL SHOWERS AND TS. SEA 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 23:30 HKT 14/Sep/2016

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 14 September 2016

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

    Weather Situation:
    Super Typhoon Meranti has weakened into a severe typhoon. At 11 p.m., Meranti with maximum sustained winds of about 175 kilometres per hour near its centre was located at 23.7 degrees north, 118.6 degrees east, it is forecast to move northwest at about 20 kilometres per hour towards the coast of southern Fujian and weaken gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    West to northwest force 5 to 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao:
    Cyclonic force 11 to 12, becoming southwest force 6 to 7 later.
    Frequent heavy squally showers and thunderstorms.
    Phenomenal seas, becoming rough later.

    Shanwei:
    West to northwest force 9 to 10, occasionally force 11.
    Frequent heavy squally showers and thunderstorms.
    High to very high seas.

    South of Hong Kong:
    West to northwest force 5 to 6, occasionally force 7.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Shangchuan Dao:
    West to northwest force 5 to 6.
    Isolated squally showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    West to southwesterly winds of force 4 to 5, force 6 to 7 in east at first. Occasional squally showers and thunderstorms.

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

    Waglan Island Wind north-northwest force 4
      Visibility 19 Kilometres

    Shantou Wind west-northwest force 2
      Visibility 30 Kilometres

    Dongsha Wind west force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind northwest force 5

    Macau Wind north force 2
      Visibility 18 Kilometres

    Xisha Wind west force 2
      Visibility 29 Kilometres

  • Explanation of Seas or Sea Waves
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    • WEATHER FORECAST FOR LOCAL AVIATION
    Traditional Chinese Simplified Chinese

    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 14/SEP/2016
    (Next update at 01:30 HKT 15/SEP/2016)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 5 P.M., SUPER TYPHOON MERANTI WAS CENTERED
     NEAR 23.0N 119.5E AND IS FORECAST TO MOVE
     NORTHWEST AT ABOUT 11 KNOTS  TOWARDS THE COAST
     OF FUJIAN.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  330/10-15
       OFFSHORE:  330/15-20 OCNL 25 AT FIRST           31-26
   B.   2000 FT:  340/20 OCNL 25 AT FIRST              23
   C.   5000 FT:  020/20                               19
   D.  10000 FT:  020/25                               12
   E.  18000 FT:  350/25                               MS2
   F.  24000 FT:  360/25                               MS13
   G.  30000 FT:  340/15                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY. LOCALISED HAZE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT SCT 4000 FT
   K. VISIBILITY    : 8 KM.  TEMPO 4000 M IN HAZE
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 13200 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND  NEAR HILLS
   N. SEA STATE     : 2.0-3.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE WEST TO NORTHWESTERLY WINDS. MAINLY
     CLOUDY WITH SUNNY INTERVALS. A FEW SHOWERS AND
     ISOLATED THUNDERSTORMS LATER.=

    ===================================================================
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
    Traditional Chinese Simplified Chinese

    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 22:05 HKT on 14 Sep 16

    VHHK SIGMET 2 VALID 141410/141810 VHHH- VHHK HONG KONG FIR EMBD TS FCST E OF E11630 TOP FL400 STNR NC=

    Please click here for more about the SIGMET

    TROPICAL CYCLONE WARNING Skip to main content
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    Tropical Cyclone Warnings

    Bulletin issued at 23:45 HKT 14/Sep/2016

    Tropical Cyclone Bulletin

    Here is the latest Tropical Cyclone Bulletin issued by the Hong Kong Observatory.

    The Standby Signal, No. 1 is in force.

    This means that a tropical cyclone now centred within about 800 kilometres of Hong Kong may affect us.

    At midnight, Severe Typhoon Meranti was estimated to be about 470 kilometres east-northeast of Hong Kong (near 23.8 degrees north 118.5 degrees east) and is forecast to move northwest at about 20 kilometres per hour towards the coast of southern Fujian and weaken gradually.
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    TROPICAL CYCLONE WARNING FOR SHIPPING
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    Tropical Cyclone Warning for Shipping

    Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
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    Severe Weather Information Centre

    Bulletin issued at 00:30 HKT 15/Sep/2016


    Tropical Cyclone Warning

    Super Typhoon Meranti (1614) has weakened into a Severe Typhoon with central pressure 935 hectopascals. At 141500 UTC, it was centred within 60 nautical miles of two three point seven degrees north (23.7 N) one one eight point six degrees east (118.6 E) and is forecast to move northwest at about 10 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 95 knots.

    Radius of over 33 knot winds 120 nautical miles.
    Radius of over 47 knot winds 90 nautical miles.
    Radius of over 63 knot winds 60 nautical miles.
    Radius of over 2 metre waves 210 nautical miles.

    Forecast position and intensity at 151500 UTC
    Two seven point two degrees north (27.2 N)
    One one six point nine degrees east (116.9 E)
    Maximum winds 35 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 15/Sep/2016 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     32.6 C
Minimum Air Temperature                     26.9 C
Grass Minimum Temperature                   26.2 C
Relative Humidity                        55 - 90 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2217.3 mm
Against an average of                     2076.9 mm

Other Stations                Min                  Max
King's Park                  26.3 C               32.8 C
Wong Chuk Hang               25.5 C               32.5 C
Ta Kwu Ling                  24.7 C               33.3 C
Lau Fau Shan                 26.0 C               31.6 C
Tai Po                       26.0 C               32.7 C
Sha Tin                      24.9 C               33.4 C
Tuen Mun                     25.8 C               32.5 C
Tseung Kwan O                24.7 C               33.7 C
Sai Kung                     25.6 C               32.7 C
Cheung Chau                  25.7 C               31.9 C
Chek Lap Kok                 27.5 C               32.7 C
Tsing Yi                     25.6 C               32.9 C
Shek Kong                    25.1 C               33.9 C
Tsuen Wan Ho Koon            25.2 C               31.6 C
Tsuen Wan Shing Mun Valley   24.8 C               34.0 C
Hong Kong Park               26.0 C               32.8 C
Shau Kei Wan                 26.1 C               33.3 C
Kowloon City                 26.1 C               33.4 C
Happy Valley                 26.1 C               34.6 C
Wong Tai Sin                 25.9 C               34.1 C
Stanley                      25.8 C               32.9 C
Kwun Tong                    26.7 C               33.4 C
Sham Shui Po                 26.0 C               33.5 C
Kai Tak Runway Park          26.7 C               33.7 C
Yuen Long Park               24.9 C               34.0 C

Duration of sunshine (King's Park):              9.7 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.
 

Yesterday's (14 Sep 2016) 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                               0.09
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.13
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 during
the period 1987-2015, 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 14 Sep
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