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Bulletin issued at 16:02 HKT 12/Sep/2017

At 4 p.m. at the Hong Kong Observatory the air temperature was 31 degrees Celsius and the relative humidity 74 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.6. The intensity of UV radiation was low.

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 5:45 p.m. today. Isolated thunderstorms are expected to occur over Hong Kong.
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 32 degrees;
Lau Fau Shan 27 degrees;
Tai Po 32 degrees;
Sha Tin 34 degrees;
Tuen Mun 27 degrees;
Tseung Kwan O 33 degrees;
Sai Kung 33 degrees;
Cheung Chau 30 degrees;
Chek Lap Kok 30 degrees;
Tsing Yi 31 degrees;
Shek Kong 28 degrees;
Tsuen Wan Ho Koon 30 degrees;
Tsuen Wan Shing Mun Valley 31 degrees;
Hong Kong Park 31 degrees;
Shau Kei Wan 33 degrees;
Kowloon City 31 degrees;
Happy Valley 32 degrees;
Wong Tai Sin 32 degrees;
Stanley 34 degrees;
Kwun Tong 32 degrees;
Sham Shui Po 30 degrees;
Kai Tak Runway Park 31 degrees;
Yuen Long Park 28 degrees;
Tai Mei Tuk 33 degrees.

Between 2:45 and 3:45 p.m., lightning was detected over all regions. The rainfall recorded in various regions were:

Tuen Mun 0 to 38 mm;
Yuen Long 0 to 12 mm;
Islands District 0 to 10 mm;
North District 0 to 5 mm;
Sham Shui Po 0 to 2 mm.

Here is the information on Tropical Depression at 4 p.m.:
Location: 14.6 degrees north, 120.6 degrees east.


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


Climatological Information for 12 Sep

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Bulletin updated at 16:15 HKT 12/Sep/2017

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

Thundery showers triggered by high temperatures are affecting Guangdong.

At 4 p.m., the tropical depression near the Philippines was centred about 40 kilometres west-northwest of Manila. It is forecast to move west or west-northwest at about 18 kilometres per hour entering the South China Sea and intensifying gradually. Meanwhile, Typhoon Talim was centred about 750 kilometres east-southeast of Taibei. It is forecast to intensify gradually and move northwest or west-northwest at about 22 kilometres per hour towards of the East China Sea.

Weather forecast for tonight and tomorrow

Hazy. A few showers and isolated thunderstorms at first. Temperatures will range between 27 and 32 degrees. Temperatures over the New Territories will be a couple of degrees higher than that over the urban areas. Sunny intervals during the day. Light winds, becoming moderate to fresh east to northeasterlies.

Outlook : Very hot with sunny periods on Thursday. There will be squally showers in the latter part of this week.


(The above forecast period is valid up to 23:59 HKT tomorrow, 13/09/2017; 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 09:00 HKT 12/Sep/2017

GALE WARNING AREA: BASHI.

GENERAL SITUATION AT 112100 UTC:
LOW 1002 HPA 15N 122E WNW 10 KT INTSF.

MARINE FORECAST FOR 24 HOURS FROM 120100 UTC:

HONG KONG= S 4, BEC E TO NE 5. ISOL SHOWERS AND TS. SEA UP TO 2 M. TEMP 32-27 C. =
KWANGTUNG= S 4, BEC E TO NE 5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
TAIWAN STRAIT= NE 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. =
BASHI= E TO NE 6-7, 8 IN E LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M, 6 M IN E LATER. SWELL E TO NE 3-5 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 M. =
BALINTANG= E TO NE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO NE 3-5 M. =
SCARBOROUGH= N TO NE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
PARACEL= NE 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL E TO NE 2 M. =
TONKIN= S 4, BEC NE 5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= NE 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.


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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/Sep/2017

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

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    At 4 p.m., the tropical depression over the Philippines with maximum sustained winds of about 45 kilometres per hour near its centre was located at 14.6 degrees north, 120.6 degrees east. It is forecast to move west or west-northwest at about 18 kilometres per hour entering the South China Sea and intensifying gradually. Meanwhile, Typhoon Talim with maximum sustained winds of about 140 kilometres per hour near its centre was located at 22.3 degrees north, 128.2 degrees east. It is forecast to intensify gradually and move northwest or west-northwest at about 22 kilometres per hour towards of the East China Sea.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to northeast force 4 to 5, occasionally force 6.
    Hazy and a few showers. Isolated thunderstorms at first.
    Moderate to rough seas.

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

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

    Outlook for the next 48 hours
    East to northeasterly winds of force 7 to 8. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind south-southeast force 1
      Visibility 15 Kilometres

    Shantou Wind east-southeast force 2
      Visibility 22 Kilometres

    Dongsha Wind north force 3
      Visibility 10 Kilometres

    Macau Wind north-northeast force 3
      Visibility 8 Kilometres

    Xisha Wind north-northwest force 3
      Visibility 30 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 11:45 HKT 12/SEP/2017
    (Next update at 17:30 HKT 12/SEP/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     UNDER THE INFLUENCE OF THE ANTICYCLONE ALOFT, IT
     IS GENERALLY FINE OVER SOUTHEASTERN CHINA.
     BESIDES, THE AREA OF LOW PRESSURE NEAR THE
     PHILIPPINES HAS INTENSIFIED INTO A TROPICAL
     DEPRESSION. AT NOON, THE TROPICAL DEPRESSION
     WAS CENTRED AT 14.2 DEGREES NORTH, 120.8 DEGREES
     EAST. IT IS FORECAST TO MOVE WEST OR
     WEST-NORTHWEST AT ABOUT 10 KNOTS ACROSS LUZON,
     ENTERING THE SOUTH CHINA SEA AND INTENSIFY
     GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1200 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  360/5-10
                  TEMPO VRB/15G25 IN TS                31-35
   B.   2000 FT:  020/10-15                            25
   C.   5000 FT:  060/10                               19
   D.  10000 FT:  060/10                               13
   E.  18000 FT:  100/10                               MS1
   F.  24000 FT:  150/15                               MS12
   G.  30000 FT:  140/25                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE WITH SOME HAZE. 
      A FEW SHOWERS AND ISOLATED THUNDERSTORMS LATER.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT SCT 2500 FT.  
      TEMPO FEW CB 1000 FT  SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 8 KM. TEMPO 4000 M IN SHOWERS/HAZE. 
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS. 
                      MOD NEAR HILLS.
   N. SEA STATE     : 0.5-1.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT NORTHERLY WINDS, BECOMING MODERATE TO
     FRESH EAST TO NORTHEASTERLY WINDS. MAINLY CLOUDY
     WITH A FEW SHOWERS AND ISOLATED 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 15:26 HKT on 09 Sep 17

    VHHK SIGMET 2 VALID 090717/091115 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF LINE N2036 E11430 - N2036 E11130 AND W OF E11430 TOP FL350 MOV NE 10KT NC= VHHK SIGMET 4 VALID 090726/091115 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF N2030 W OF E11430 TOP FL350 MOV NE 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 15:49 HKT 12/Sep/2017


    Tropical Cyclone Warning

    At 120600 UTC, Tropical Depression over the Philippines with central pressure 1000 hectopascals was centred within 90 nautical miles of one four point five degrees north (14.5 N) one two zero point seven degrees east (120.7 E) and is forecast to move west or west-northwest at about 10 knots for the next 24 hours.

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

    Radius of over 2 metre waves 180 nautical miles.

    Forecast position and intensity at 130600 UTC
    One five point eight degrees north (15.8 N)
    One one seven point one degrees east (117.1 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 140600 UTC
    One six point nine degrees north (16.9 N)
    One one three point eight degrees east (113.8 E)
    Maximum winds 55 knots.

    Forecast position and intensity at 150600 UTC
    One eight point two degrees north (18.2 N)
    One one zero point five degrees east (110.5 E)
    Maximum winds 65 knots.

    Forecast position and intensity at 160600 UTC
    Two zero point zero degrees north (20.0 N)
    One zero six point four degrees east (106.4 E)
    Maximum winds 60 knots.

    Forecast position and intensity at 170600 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 12/Sep/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     32.4 C
Minimum Air Temperature                     27.6 C
Grass Minimum Temperature                   26.7 C
Relative Humidity                        61 - 88 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2348.1 mm
Against an average of                     2031.2 mm

Other Stations                Min                  Max
King's Park                  27.3 C               32.5 C
Wong Chuk Hang               26.1 C               32.1 C
Ta Kwu Ling                  24.7 C               34.7 C
Lau Fau Shan                 26.1 C               32.4 C
Tai Po                       25.7 C               32.8 C
Sha Tin                      26.1 C               33.9 C
Tuen Mun                     26.1 C               33.4 C
Tseung Kwan O                25.9 C               32.9 C
Sai Kung                     26.7 C               32.3 C
Cheung Chau                  26.6 C               34.4 C
Chek Lap Kok                 27.0 C               33.5 C
Tsing Yi                     26.0 C               32.4 C
Shek Kong                    25.5 C               34.6 C
Tsuen Wan Ho Koon            24.9 C               31.5 C
Tsuen Wan Shing Mun Valley   25.3 C               33.3 C
Hong Kong Park               26.5 C               32.6 C
Shau Kei Wan                 27.0 C               32.3 C
Kowloon City                 27.2 C               34.1 C
Happy Valley                 26.4 C               33.8 C
Wong Tai Sin                 26.1 C               33.5 C
Stanley                      26.7 C               32.8 C
Kwun Tong                    27.4 C               32.6 C
Sham Shui Po                 27.2 C               33.4 C
Kai Tak Runway Park          27.4 C               32.9 C
Yuen Long Park               26.1 C               35.1 C
Tai Mei Tuk               26.2 C               34.2 C

Duration of sunshine (King's Park):              10.8 H
The mean UV index recorded at King's Park yesterday was 5,
the UV intensity was Moderate.
The maximum UV index for yesterday was 10.
Sea surface temperature (Waglan Island):        27.5 C 

Yesterday's (11 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                             0.08
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                          0.08
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.12
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 Sep
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