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Bulletin issued at 15:02 HKT 12/Oct/2017

At 3 p.m. at the Hong Kong Observatory the air temperature was 33 degrees Celsius and the relative humidity 60 per cent.
During the past hour the mean UV Index recorded at King's Park was 4. The intensity of UV radiation was moderate.

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 32 degrees;
Wong Chuk Hang 32 degrees;
Ta Kwu Ling 33 degrees;
Lau Fau Shan 32 degrees;
Tai Po 32 degrees;
Sha Tin 33 degrees;
Tuen Mun 33 degrees;
Tseung Kwan O 33 degrees;
Sai Kung 31 degrees;
Cheung Chau 30 degrees;
Chek Lap Kok 34 degrees;
Tsing Yi 33 degrees;
Shek Kong 33 degrees;
Tsuen Wan Ho Koon 32 degrees;
Tsuen Wan Shing Mun Valley 32 degrees;
Hong Kong Park 32 degrees;
Shau Kei Wan 30 degrees;
Kowloon City 33 degrees;
Happy Valley 33 degrees;
Wong Tai Sin 33 degrees;
Stanley 32 degrees;
Kwun Tong 31 degrees;
Sham Shui Po 35 degrees;
Kai Tak Runway Park 31 degrees;
Yuen Long Park 33 degrees;
Tai Mei Tuk 31 degrees.


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


Climatological Information for 12 Oct

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 14:45 HKT 12/Oct/2017

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

An anticyclone aloft is bringing generally fine weather to southern China. Meanwhile, the northeast monsoon affecting the northern part of Guangdong is extending southwards.

At noon, the tropical depression to the east of the Philippines was centred about 580 kilometres northeast of Manila. It is forecast to move west at about 22 kilometres per hour towards Luzon and intensify gradually.

Weather forecast for this afternoon and tonight

Mainly fine. Very hot and dry in the afternoon. Becoming cloudy with one or two rain patches tonight. Moderate northeasterly winds, freshening tonight.

Outlook : Cooler morning in the next couple of days. Weather deteriorating with heavy rain and squalls on Sunday and Monday.


(The above forecast period is valid up to 23:59 HKT today, 12/10/2017; 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/Oct/2017

GALE WARNING AREAS: KWANGTUNG AND TAIWAN STRAIT.

GENERAL SITUATION AT 112100 UTC:
A NORTHEAST MONSOON IS EXPECTED TO AFFECT THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 120100 UTC:

HONG KONG= E TO NE 4-5, OCNL 6. DOWN TO 4000 M IN SOME HAZE LATER. ONE OR TWO RAIN PATCHES AT NIGHT. SEA UP TO 2 M. SWELL E TO NE 2 M. TEMP 32-25 C. =
KWANGTUNG= E TO NE 6-7, UP TO 8 IN E. ISOL SHOWERS AND TS. SEA 3-4 M, UP TO 6 M IN E. SWELL E TO NE 2-3 M. =
TAIWAN STRAIT= NE 7-8. ISOL SHOWERS. SEA 4-6 M. SWELL NE 3-4 M. =
BASHI= E 6-7. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO NE 3-4 M. =
PRATAS= E 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO NE 3-4 M. =
BALINTANG= E 6-7. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO NE 3-4 M. =
SCARBOROUGH= E TO NE 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 2-3 M. =
PARACEL= E TO NE 5-6, OCNL 7. ISOL SHOWERS AND TS. SEA UP TO 4 M. SWELL E TO NE 2-3 M. =
TONKIN= E TO NE 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL E TO NE UP TO 2 M. =
DANANG= E TO NE 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL E TO NE 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 12/Oct/2017

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

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

    Weather Situation:
    The northeast monsoon will affect the south China coastal waters gradually. At noon, the tropical depression to the east of the Philippines with maximum sustained winds of about 45 kilometres per hour near its centre was located at 17.5 degrees north, 125.4 degrees east. It is forecast to move west at about 22 kilometres per hour towards Luzon and intensify gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to northeast force 4 to 5, occasionally force 6.
    One or two rain patches.
    Moderate to rough seas.

    Nan'ao:
    East to northeast force 6 to 7, occasionally force 8.
    Rough to very rough seas.

    Shanwei:
    East to northeast force 5 to 6, occasionally force 7.
    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 6 to 7, force 8 to 9 later. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind northeast force 4
      Visibility 19 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 30 Kilometres

    Dongsha Wind northeast force 5
      Visibility 10 Kilometres

    Macau Wind north force 3
      Visibility 11 Kilometres

    Xisha Wind northeast force 2
      Visibility 14 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 11:30 HKT 12/OCT/2017
    (Next update at 17:30 HKT 12/OCT/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     UNDER THE INFLUENCE OF AN ANTICYCLONE ALOFT, THE
     WEATHER IS GENERALLY FINE OVER SOUTHERN CHINA.
     THE AREA OF LOW PRESSURE TO THE EAST OF THE
     PHILIPPINES HAS INTENSIFIED INTO A TROPICAL
     DEPRESSION.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1130 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  030/10-15
       OFFSHORE:  030/15-20                            32-35
   B.   2000 FT:  030/15-20                            25
   C.   5000 FT:  040/20                               18
   D.  10000 FT:  040/20                               12
   E.  18000 FT:  080/15                               MS3
   F.  24000 FT:  100/15                               MS13
   G.  30000 FT:  090/10                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE WITH ONE OR TWO ISOLATED SHOWERS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT
   K. VISIBILITY    : 10 KM. TEMPO 4000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11400 FT
   M. TURBULENCE    : MOD
   N. SEA STATE     : 2.0-3.0 M     SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTH TO NORTHEASTERLY WINDS, FRESH
     OFFSHORE. MAINLY CLOUDY WITH ONE OR TWO 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 15:00 HKT on 12 Oct 17

    VHHK SIGMET 1 VALID 120300/120700 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1830 E11530 - N1900 E11500 - N2100 E11524 - N2142 E11730 - N2100 E11730 TOP FL400 MOV WSW 05KT WKN= VHHK SIGMET 2 VALID 120700/121100 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1730 E11442 - N1942 E11400 - N2100 E11618 - N2100 E11730 TOP FL420 MOV WSW 05KT 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 15:30 HKT 12/Oct/2017


    Tropical Cyclone Warning

    The tropical depression to the east of the Philippines has entered the area of responsibility of the Hong Kong Observatory.

    At 120600 UTC, the tropical depression to the east of the Philippines with central pressure 1000 hectopascals was centred within 90 nautical miles of one seven point eight degrees north (17.8 N) one two four point seven degrees east (124.7 E) and is forecast to move west at about 12 knots for the next 24 hours.

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

    Radius of over 2 metre waves 90 nautical miles.

    Forecast position and intensity at 130600 UTC
    One seven point six degrees north (17.6 N)
    One one nine point four degrees east (119.4 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 140600 UTC
    One seven point four degrees north (17.4 N)
    One one six point six degrees east (116.6 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 150600 UTC
    One eight point seven degrees north (18.7 N)
    One one two point seven degrees east (112.7 E)
    Maximum winds 65 knots.

    Forecast position and intensity at 160600 UTC
    One eight point eight degrees north (18.8 N)
    One zero eight point four degrees east (108.4 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 170600 UTC
    One nine point zero degrees north (19.0 N)
    One zero seven point zero degrees east (107.0 E)
    Maximum winds 30 knots.



    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/Oct/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     32.5 C
Minimum Air Temperature                     28.3 C
Grass Minimum Temperature                   26.7 C
Relative Humidity                        60 - 81 Percent
Rainfall                                     0.2 mm 
Total rainfall since 1st January          2461.4 mm
Against an average of                     2279.9 mm

Other Stations                Min                  Max
King's Park                  27.4 C               32.0 C
Wong Chuk Hang               28.8 C               32.5 C
Ta Kwu Ling                  26.7 C               33.7 C
Lau Fau Shan                 27.5 C               34.3 C
Tai Po                       28.3 C               31.7 C
Sha Tin                      28.7 C               32.9 C
Tuen Mun                     27.8 C               32.8 C
Tseung Kwan O                27.5 C               32.9 C
Sai Kung                     28.6 C               30.9 C
Cheung Chau                  27.5 C               32.1 C
Chek Lap Kok                 28.7 C               35.0 C
Tsing Yi                     27.9 C               33.2 C
Shek Kong                    28.4 C               33.4 C
Tsuen Wan Ho Koon            26.5 C               31.9 C
Tsuen Wan Shing Mun Valley   27.4 C               33.3 C
Hong Kong Park               27.9 C               30.8 C
Shau Kei Wan                 28.1 C               31.1 C
Kowloon City                 28.0 C               32.8 C
Happy Valley                 28.8 C               33.3 C
Wong Tai Sin                 28.1 C               32.9 C
Stanley                      28.3 C               31.1 C
Kwun Tong                    28.0 C               31.7 C
Sham Shui Po                 28.2 C               33.8 C
Kai Tak Runway Park          28.9 C               31.5 C
Yuen Long Park               29.0 C               34.4 C
Tai Mei Tuk               27.5 C               32.3 C

Duration of sunshine (King's Park):              10.4 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.
Sea surface temperature (Waglan Island):        29.3 C 

Yesterday's (11 Oct 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                         0.12
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                      0.13
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 Oct
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