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Bulletin issued at 21:02 HKT 15/Oct/2017

At 9 p.m. at the Hong Kong Observatory the air temperature was 26 degrees Celsius and the relative humidity 90 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 3 has been issued.

The air temperatures at other places were:

King's Park 27 degrees;
Wong Chuk Hang 27 degrees;
Ta Kwu Ling 22 degrees;
Lau Fau Shan 21 degrees;
Tai Po 26 degrees;
Sha Tin 28 degrees;
Tuen Mun 21 degrees;
Tseung Kwan O 26 degrees;
Sai Kung 27 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 27 degrees;
Tsing Yi 27 degrees;
Shek Kong 23 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 26 degrees;
Hong Kong Park 27 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 26 degrees;
Happy Valley 27 degrees;
Wong Tai Sin 26 degrees;
Stanley 27 degrees;
Kwun Tong 27 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 27 degrees;
Yuen Long Park 22 degrees;
Tai Mei Tuk 25 degrees.

Between 7:45 and 8:45 p.m., the rainfall recorded in various regions were:

Yuen Long 0 to 11 mm;
Tai Po 0 to 10 mm;
North District 0 to 10 mm;
Sha Tin 0 to 3 mm;
Sai Kung 0 to 2 mm;
Islands District 0 to 1 mm;
Tuen Mun 0 to 1 mm;
Tsuen Wan 0 to 1 mm.

Here is the information on Typhoon Khanun:
Location: 20.8 degrees north, 111.6 degrees east; Maximum sustained wind near its centre: 145 km/h.


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


Climatological Information for 15 Oct

Regional Weather in Hong Kong

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Bulletin updated at 20:55 HKT 15/Oct/2017

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

Weather forecast for tonight and tomorrow

Fresh to strong east to northeasterly winds, occasionally gale winds offshore and on high ground at first. Cloudy with squally showers, heavy at times at first. Seas will be rough with swells. Temperatures will range between 23 and 27 degrees.

Outlook : Weather will improve gradually in the following few days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 16/10/2017; 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 15/Oct/2017

HURRICANE WARNING AREAS: KWANGTUNG AND PARACEL.
GALE WARNING AREAS: HONG KONG, TAIWAN STRAIT, PRATAS, TONKIN AND DANANG.

GENERAL SITUATION AT 150900 UTC:
FOR DETAILS ON TYPHOON KHANUN (1720), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 151300 UTC:

HONG KONG= E TO NE 6-7, UP TO 9 AT FIRST. DOWN TO 1000 M IN HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 8 M AT FIRST. SWELL E TO NE 2-3 M. TEMP 23-27 C. =
KWANGTUNG= E TO SE 9-10, CYCLONIC 12 IN W AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 8-10 M, 14 M IN W AT FIRST. SWELL E TO NE 5 M, SE 5 M. =
TAIWAN STRAIT= NE 7, UP TO 8 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 4 M, UP TO 6 M AT FIRST. SWELL SE 3-5 M. =
BASHI= E TO SE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL S TO SW 3-4 M. =
PRATAS= S TO SE 8-9, BEC 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, BEC 3-4 M. SWELL S TO SE 5 M. =
BALINTANG= E TO SE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL S TO SW 3-4 M. =
SCARBOROUGH= S 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NW 3 M. =
PARACEL= NW UP TO 12, 6-7 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 14 M, 3-4 M LATER. SWELL E TO NE 5 M, SE 5 M. =
TONKIN= N TO NW 8-9, BEC CYCLONIC UP TO 9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M. SWELL E TO NE 3-4 M. =
DANANG= N TO NW 7-8, UP TO 9 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, UP TO 8 M LATER. SWELL E TO NE 3-4 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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    Bulletin issued at 21:10 HKT 15/Oct/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:10 p.m. on 15 October 2017

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

    Weather Situation:
    At 9 p.m., Typhoon Khanun with maximum sustained winds of about 145 kilometres per hour near its centre was located at 20.8 degrees north, 111.6 degrees east. It is forecast to move west at about 22 kilometres per hour across the northern part of the South China Sea towards the vicinity of Leizhou Peninsula.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to northeast force 6 to 7, up to force 9 at first.
    Heavy squally showers and thunderstorms.
    Very rough to high seas.

    Nan'ao:
    East to southeast force 7, up to force 8 at first.
    Heavy squally showers and thunderstorms.
    Very rough to high seas.

    Shanwei:
    East to southeast force 8 to 9.
    Frequent heavy squally showers and thunderstorms.
    High to very high seas.

    South of Hong Kong:
    Southeast up to force 11, becoming force 9 to 10.
    Frequent heavy squally showers and thunderstorms.
    Phenomenal seas, becoming very high.

    Shangchuan Dao:
    Cyclonic force 12, becoming southeast force 9 to 10.
    Frequent heavy squally showers and thunderstorms.
    Phenomenal seas, becoming very high.

    Outlook for the next 48 hours
    East to northeasterly winds of force 6 to 7. Heavy squally showers and thunderstorms.

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

    Waglan Island Wind east-southeast force 5
      Visibility 7 Kilometres

    Shantou Wind northeast force 1
      Visibility 5000 Metres in showers

    Dongsha Wind south-southeast force 4
      Visibility 10 Kilometres

    Macau Wind northeast force 4
      Visibility 9 Kilometres in showers

    Xisha Wind west force 2
      Visibility 13 Kilometres

  • Explanation of Seas or Sea Waves
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  • Descriptive Terms of Wind Speeds
  • Visibility Readings in Hong Kong Waters
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 19:00 HKT 15/OCT/2017
    (Next update at 01:30 HKT 16/OCT/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     SEV TURB AND SEV GUSTS.  GALE FORCE WINDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     SEVERE TYPHOON KHANUN HAS WEAKENED INTO A
     TYPHOON. AT 7 P.M., KHANUN WAS CENTRED ABOUT 290
     KILOMETRES SOUTHWEST OF HONG KONG (NEAR 20.7
     DEGREES NORTH 112.0 DEGREES EAST) AND IS
     FORECAST TO MOVE WEST AT ABOUT 12 KNOTS ACROSS
     THE NORTHERN PART OF THE SOUTH CHINA SEA IN THE
     GENERAL DIRECTION OF LEIZHOU PENINSULA TO HAINAN
     ISLAND.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1900 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  080/25-30, OCNL 35
                  BEC 110/20-25
       OFFSHORE:  090/30-35, OCNL 40
                  BEC 120/25                           27-23
   B.   2000 FT:  090/40-50
                  BEC 090/30-40                        20
   C.   5000 FT:  090/55-65
                  BEC 100/30-40                        20
   D.  10000 FT:  100/40-55                            11
   E.  18000 FT:  100/40-55                            MS3
   F.  24000 FT:  120/40-50                            MS11
   G.  30000 FT:  120/30-40                            MS24
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      900-1300 FT, 3000-3600 FT
   I. WEATHER       : 
      CLOUDY  WITH HEAVY SQUALLY SHOWERS
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 2500 FT BKN 5000 FT
   K. VISIBILITY    : 8 KM. TEMPO 2000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11200 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 4.0-6.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EASTERLIES. CLOUDY WITH
     SQUALLY SHOWERS, HEAVY AT TIMES AT FIRST.=

    ===================================================================
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 21:35 HKT on 15 Oct 17

    VHHK SIGMET 6 VALID 151025/151500 VHHH- VHHK HONG KONG FIR TC KHANUN PSN N2036 E11242 CB OBS AT 0900Z WI 210NM OF TC CENTRE TOP FL520 NC FCST AT 1500Z TC CENTRE PSN N2036 E11130= VHHK SIGMET 8 VALID 151335/151500 VHHH- VHHK HONG KONG FIR TC KHANUN PSN N2042 E11142 CB OBS AT 1200Z WI 210NM OF TC CENTRE TOP FL450 WKN FCST AT 1500Z TC CENTRE PSN N2048 E11130=

    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 20:45 HKT 15/Oct/2017

    Tropical Cyclone Warning Bulletin

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

    The Strong Wind Signal, No. 3 is in force.

    This means that winds with mean speeds of 41 to 62 kilometres per hour are expected.

    At 9 p.m., Typhoon Khanun was estimated to be about 310 kilometres west-southwest of Hong Kong (near 20.8 degrees north 111.6 degrees east) and is forecast to move west at about 22 kilometres per hour across the northern part of the South China Sea towards the vicinity of Leizhou Peninsula.

    With Khanun continuing to depart from Hong Kong, winds over Hong Kong will weaken further. The Observatory will consider issuing the Standby Signal No. 1 in a couple of hours.

    In the past hour, the maximum sustained winds recorded at Cheung Chau Beach were 56 kilometres per hour with maximum gusts 75 kilometres per hour.

    (Precautionary Announcements with No. 3 Signal)

    1. You should not relax taking precautions as strong winds are still blowing and unsecured objects may be blown down. On no account should you touch electric cables that have been blown loose.

    2. It is not yet safe for small craft and fishing vessels to leave typhoon shelters.

    3. Listen to radio, watch TV or browse the Hong Kong Observatory's web site for information on the tropical cyclone.
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    TROPICAL CYCLONE WARNING FOR SHIPPING
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    Tropical Cyclone Warning for Shipping

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    Severe Weather Information Centre

    Bulletin issued at 21:30 HKT 15/Oct/2017


    Tropical Cyclone Warning

    At 151200 UTC, Typhoon Khanun (1720) with central pressure 960 hectopascals was centred within 60 nautical miles of two zero point seven degrees north (20.7 N) one one one point seven degrees east (111.7 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 75 knots.

    Radius of over 33 knot winds 120 nautical miles over northern semicircle, 90 nautical miles elsewhere.
    Radius of over 47 knot winds 60 nautical miles.
    Radius of over 63 knot winds 30 nautical miles.
    Radius of over 2 metre waves 270 nautical miles over northern semicircle, 240 nautical miles elsewhere.

    Forecast position and intensity at 161200 UTC
    One nine point five degrees north (19.5 N)
    One zero eight point four degrees east (108.4 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 171200 UTC
    Dissipated over sea.



    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/Oct/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     25.6 C
Minimum Air Temperature                     21.9 C
Grass Minimum Temperature                   22.5 C
Relative Humidity                        63 - 82 Percent
Rainfall                                     0.4 mm 
Total rainfall since 1st January          2461.8 mm
Against an average of                     2292.4 mm

Other Stations                Min                  Max
King's Park                  21.5 C               25.3 C
Wong Chuk Hang               21.9 C               27.5 C
Ta Kwu Ling                  20.5 C               24.6 C
Lau Fau Shan                 22.0 C               24.9 C
Tai Po                       20.5 C               24.4 C
Sha Tin                      21.8 C               25.6 C
Tuen Mun                     22.4 C               26.4 C
Tseung Kwan O                21.6 C               26.4 C
Sai Kung                     21.5 C               25.2 C
Cheung Chau                  20.8 C               26.5 C
Chek Lap Kok                 22.9 C               27.0 C
Tsing Yi                     22.6 C               26.1 C
Shek Kong                    20.9 C               24.9 C
Tsuen Wan Ho Koon            19.9 C               25.1 C
Tsuen Wan Shing Mun Valley   21.4 C               26.3 C
Hong Kong Park               21.5 C               25.7 C
Shau Kei Wan                 21.6 C               25.9 C
Kowloon City                 20.8 C               25.4 C
Happy Valley                 22.0 C               27.8 C
Wong Tai Sin                 21.0 C               26.1 C
Stanley                      21.5 C               26.6 C
Kwun Tong                    21.2 C               25.7 C
Sham Shui Po                 21.2 C               25.8 C
Kai Tak Runway Park          21.8 C               25.9 C
Yuen Long Park               22.4 C               25.9 C
Tai Mei Tuk               19.8 C               25.0 C

Duration of sunshine (King's Park):              0 H
The mean UV index recorded at King's Park yesterday was 1,
the UV intensity was Low.
The maximum UV index for yesterday was 4.
Sea surface temperature (Waglan Island):        28.4 C 

Yesterday's (14 Oct 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 to
0.15 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                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.09
King's Park                         0.15
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.15

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 14 Oct
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