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Bulletin issued at 21:02 HKT 12/Oct/2017

At 9 p.m. at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 69 per cent.

The air temperatures at other places were:

King's Park 29 degrees;
Wong Chuk Hang 29 degrees;
Ta Kwu Ling 29 degrees;
Lau Fau Shan 29 degrees;
Tai Po 29 degrees;
Sha Tin 30 degrees;
Tuen Mun 29 degrees;
Tseung Kwan O 27 degrees;
Sai Kung 29 degrees;
Cheung Chau 28 degrees;
Chek Lap Kok 30 degrees;
Tsing Yi 30 degrees;
Shek Kong 29 degrees;
Tsuen Wan Ho Koon 28 degrees;
Tsuen Wan Shing Mun Valley 29 degrees;
Hong Kong Park 29 degrees;
Shau Kei Wan 28 degrees;
Kowloon City 29 degrees;
Happy Valley 29 degrees;
Wong Tai Sin 29 degrees;
Stanley 28 degrees;
Kwun Tong 28 degrees;
Sham Shui Po 29 degrees;
Kai Tak Runway Park 30 degrees;
Yuen Long Park 30 degrees;
Tai Mei Tuk 28 degrees.

Here is the information on Tropical Depression at 8 p.m.:
Location: 18.1 degrees north, 123.6 degrees east.


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 20:45 HKT 12/Oct/2017

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

The northeast monsoon affecting inland Guangdong is extending southwards gradually and is expected to reach the coastal areas overnight.

At 8 p.m., the tropical depression near Luzon was centred about 480 kilometres northeast of Manila. It is forecast to move west at about 22 kilometres per hour across the vicinity of Luzon, enter the South China Sea and intensify gradually.

Weather forecast for tonight and tomorrow

Cloudy periods with one or two light rain patches overnight. Mainly fine and dry during the day tomorrow. Temperatures will range between 26 and 31 degrees. Moderate to fresh north to northeasterly winds, occasionally strong offshore tomorrow.

Outlook : Some rain later on Saturday. Weather deteriorating with heavy rain and squalls in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 13/10/2017; 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 21:00 HKT 12/Oct/2017

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

GENERAL SITUATION AT 120900 UTC:
FOR DETAILS ON TROPICAL DEPRESSION NEAR LUZON, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS. UNDER THE COMBINED EFFECT OF THE NORTHEAST MONSOON AND THE TROPICAL CYCLONE, IT WILL BE WINDY WITH HEAVY RAIN OVER THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 121300 UTC:

HONG KONG= N 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO NE 2-3 M. TEMP 26-31 C. =
KWANGTUNG= N TO NE 7-8, UP TO 9 IN E. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, UP TO 8 M IN E. SWELL E TO NE 3-5 M. =
TAIWAN STRAIT= N TO NE 9. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 8 M. SWELL NE 3-4 M. =
BASHI= NE 7-8, OCNL 9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 8 M. SWELL E TO NE 3-5 M. =
PRATAS= NE 7-8, OCNL 9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 8 M. SWELL E TO NE 3-5 M. =
BALINTANG= NE 7-8, OCNL 9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 8 M. SWELL E TO NE 3-5 M. =
SCARBOROUGH= CYCLONIC 7-8, OCNL 9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 8 M. SWELL NE 3-5 M. =
PARACEL= N TO NE 6-7, OCNL 8. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL NE 3 M. =
TONKIN= N TO NE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
DANANG= N TO NE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2-3 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 19:55 HKT 12/Oct/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:55 p.m. on 12 October 2017

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

    Weather Situation:
    At 8 p.m., the tropical depression near Luzon with maximum sustained winds of about 55 kilometres per hour near its centre was located near 18.1 degrees north, 123.6 degrees east. It is forecast to move west at about 22 kilometres per hour across the vicinity of Luzon, enter the South China Sea and intensify gradually. Under the combined effect of the northeast monsoon and the tropical cyclone, it will be windy with heavy rain over the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North force 6 to 7.
    Isolated squally showers and thunderstorms.
    Rough seas.

    Nan'ao:
    North to northeast force 8 to 9.
    Occasional heavy squally showers and thunderstorms.
    Very rough to high seas.

    Shanwei and South of Hong Kong:
    North to northeast force 7 to 8.
    Scattered heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Shangchuan Dao:
    North to northeast force 6 to 7, occasionally force 8.
    Isolated squally showers and thunderstorms.
    Rough to very rough seas.

    Outlook for the next 48 hours
    North to northeasterly winds of force 8 to 9, becoming cyclonic winds of force 10 in west later. Occasional heavy squally showers and thunderstorms.

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

    Waglan Island Wind east-northeast force 3
      Visibility 13 Kilometres

    Shantou Wind east 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 3
      Visibility 22 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 17:30 HKT 12/OCT/2017
    (Next update at 01:30 HKT 13/OCT/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 4 P.M., THE TROPICAL DEPRESSION TO THE EAST
     OF THE PHILIPPINES WAS LOCATED NEAR 17.9 DEGREES
     NORTH, 124.5 DEGREES EAST. IT IS FORECAST TO
     MOVE WEST AT ABOUT 12 KNOTS TOWARDS LUZON AND
     INTENSIFY GRADUALLY. BESIDES, THE NORTHEAST
     MONSOON AFFECTING INLAND GUANGDONG IS EXTENDING
     SOUTHWARDS GRADUALLY AND IS EXPECTED TO REACH
     THE COASTAL AREAS OVERNIGHT.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  010/15
       OFFSHORE:  020/20-25                            32-25
   B.   2000 FT:  010/20-25                            21
   C.   5000 FT:  040/20                               18
   D.  10000 FT:  040/15                               11
   E.  18000 FT:  070/10                               MS3
   F.  24000 FT:  100/10                               MS13
   G.  30000 FT:  110/10                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY PERIODS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT SCT 4500 FT
   K. VISIBILITY    : 9 KM.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11400 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTH TO NORTHEASTERLY WINDS,
     OCCASIONALLY STRONG OFFSHORE. MAINLY FINE DURING
     THE DAY.=

    ===================================================================
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 21:30 HKT 12/Oct/2017


    Tropical Cyclone Warning

    The tropical depression near Luzon has intensified into a Tropical Storm with central pressure 994 hectopascals and was named as Khanun (1720). At 121200 UTC, it was centred within 60 nautical miles of one eight point one degrees north (18.1 N) one two three point five degrees east (123.5 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 35 knots.

    Radius of over 33 knot winds 30 nautical miles.
    Radius of over 2 metre waves 90 nautical miles.

    Forecast position and intensity at 131200 UTC
    One six point nine degrees north (16.9 N)
    One one eight point five degrees east (118.5 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 141200 UTC
    One seven point seven degrees north (17.7 N)
    One one five point eight degrees east (115.8 E)
    Maximum winds 55 knots.

    Forecast position and intensity at 151200 UTC
    One eight point eight degrees north (18.8 N)
    One one one point six degrees east (111.6 E)
    Maximum winds 65 knots.

    Forecast position and intensity at 161200 UTC
    One eight point five degrees north (18.5 N)
    One zero seven point seven degrees east (107.7 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 171200 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/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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