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Bulletin issued at 09:02 HKT 15/Oct/2017

At 9 a.m. at the Hong Kong Observatory the air temperature was 22 degrees Celsius and the relative humidity 82 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.7. The intensity of UV radiation was low.

Please be reminded that:

The Tropical Cyclone Signal No. 8 has been issued.

The air temperatures at other places were:

King's Park 22 degrees;
Wong Chuk Hang 23 degrees;
Ta Kwu Ling 20 degrees;
Lau Fau Shan 20 degrees;
Tai Po 20 degrees;
Sha Tin 22 degrees;
Tuen Mun 20 degrees;
Tseung Kwan O 21 degrees;
Sai Kung 21 degrees;
Cheung Chau 21 degrees;
Chek Lap Kok 22 degrees;
Tsing Yi 23 degrees;
Shek Kong 20 degrees;
Tsuen Wan Ho Koon 19 degrees;
Tsuen Wan Shing Mun Valley 21 degrees;
Hong Kong Park 22 degrees;
Shau Kei Wan 22 degrees;
Kowloon City 21 degrees;
Happy Valley 23 degrees;
Wong Tai Sin 21 degrees;
Stanley 23 degrees;
Kwun Tong 22 degrees;
Sham Shui Po 22 degrees;
Kai Tak Runway Park 24 degrees;
Yuen Long Park 21 degrees;
Tai Mei Tuk 20 degrees.

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

North District 0 to 4 mm;
Yuen Long 1 to 4 mm;
Tai Po 0 to 2 mm;
Tsuen Wan 0 to 1 mm;
Kwai Tsing 0 to 1 mm;
Islands District 0 to 1 mm;
Sai Kung 0 to 1 mm;
Tuen Mun 0 to 1 mm;
Sha Tin 0 to 1 mm.

Between midnight and 9 a.m. the minimum temperature was 20.4 degrees Celsius at the Hong Kong Observatory.

Here is the information on Typhoon Khanun:
Location: 20.0 degrees north, 114.8 degrees east; Maximum sustained wind near its centre: 140 km/h.


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


Climatological Information for 15 Oct

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Bulletin updated at 08:45 HKT 15/Oct/2017

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

Weather forecast for today

Strong to gale northerly winds, occasionally storm force on parts of high ground. Becoming east to northeasterly winds. Cloudy to overcast with occasional heavy showers and squalls. Seas will be very rough with swells. The maximum temperature will be about 24 degrees.

Outlook : Occasional heavy showers tomorrow. Windy at first. Weather will improve midweek this week.


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

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

GENERAL SITUATION AT 142100 UTC:
FOR DETAILS ON TYPHOON KHANUN (1720), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS. UNDER THE COMBINED EFFECT OF KHANUN AND THE NORTHEAST MONSOON, IT WILL BE WINDY WITH HEAVY SHOWER OVER THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 150100 UTC:

HONG KONG= N TO NE 7-8, BEC E 7-8. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL E TO NE 3 M, SE 3 M. TEMP 24-24 C. =
KWANGTUNG= E TO SE 8-9, BEC CYCLONIC UP TO 12 IN WEST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, BEC 14 M IN WEST. SWELL E TO NE 5 M, SE 5 M. =
TAIWAN STRAIT= NE 7-8, UP TO 9 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS.. SEA 4-6 M, UP TO 8 M AT FIRST. SWELL NE 5 M, SE 3-5 M. =
BASHI= E TO SE 6-7, 8-9 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS.. SEA 3-4 M, 6-8 M AT FIRST. SWELL E TO NE 5 M, SE 3-5 M. =
PRATAS= S TO SE 8-9, UP TO 12 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, UP TO 14 M AT FIRST. SWELL E TO NE 5 M, SE 5 M. =
BALINTANG= E TO SE 6-7, 8-9 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS.. SEA 3-4 M, 6-8 M AT FIRST. SWELL E TO NE 5 M, SE 3-5 M. =
SCARBOROUGH= S 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS.. SEA 3-4 M. SWELL NE 5 M. =
PARACEL= CYCLONIC UP TO 12, BEC W TO NW 8-9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 14 M, BEC 6-8 M. SWELL E TO NE 5 M, SE 5 M. =
TONKIN= N TO NW 6-7, CYCLONIC UP TO 12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS LATER. SEA 3-4 M, UP TO 14 M LATER. SWELL E TO NE 2-3 M. =
DANANG= N TO NW 6-7, UP TO 8 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS LATER. SEA 3-4 M, 6 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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    South China Coastal Waters

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    Bulletin issued at 05:30 HKT 15/Oct/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 15 October 2017

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

    Weather Situation:
    At 5 a.m., Typhoon Khanun with maximum sustained winds of about 130 kilometres per hour near its centre was located at 19.8 degrees north, 115.9 degrees east. It is forecast to move west-northwest at about 25 kilometres per hour across the northern part of the South China Sea. It will move in the general direction of Leizhou Peninsula to Hainan Island. Under the combined effect of Khanun and the northeast monsoon, it will be windy with heavy showers over the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North to northeast force 7 to 8, becoming east force 7 to 8.
    Heavy squally showers and thunderstorms.
    Rough to very rough seas.

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

    Shanwei:
    East to northeast force 8 to 9, becoming southeast up to force 12.
    Frequent heavy squally showers and thunderstorms.
    Very rough to high seas, becoming phenomenal seas.

    South of Hong Kong and Shangchuan Dao:
    North to northwest force 8 to 9, becoming cyclonic up to force 12.
    Frequent heavy squally showers and thunderstorms.
    Very rough to high seas, becoming phenomenal seas.

    Outlook for the next 48 hours
    Easterly winds of force 6 to 7, west to southwesterly winds up to force 10 in west at first. Heavy squally showers and thunderstorms.

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

    Waglan Island Wind north force 8
      Visibility 9 Kilometres

    Shantou Wind north-northwest force 1
      Visibility 17 Kilometres

    Dongsha Wind east force 6
      Visibility 9 Kilometres in rain

    Macau Wind north force 4
      Visibility 23 Kilometres

    Xisha Wind northwest force 4
      Visibility 11 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
  • 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 01:30 HKT 15/OCT/2017
    (Next update at 9:00-9:30 HKT 15/OCT/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     SEV TURB AND SEV GUSTS.  STORM FORCE WINDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     SEVERE TROPICAL STORM KHANUN HAS INTENSIFIED INTO A TYPHOON.
     AT MIDNIGHT, KHANUN WAS LOCATED NEAR 19.1
     DEGREES NORTH, 117.3 DEGREES EAST. IT IS
     FORECAST TO MOVE NORTHWEST OR WEST-NORTHWEST 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 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  360/20-25G35
                  060/30G40 LATER
       OFFSHORE:  360/25-30 OCNL 35G45
                  060/35G45 LATER                      23-20
   B.   2000 FT:  010/45, 60 LATER                     17
   C.   5000 FT:  070/45, 60 LATER                     19
   D.  10000 FT:  080/40, 60 LATER                     12
   E.  18000 FT:  080/30-40                            MS2
   F.  24000 FT:  090/25                               MS12
   G.  30000 FT:  090/25                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      1800-2100 FT
   I. WEATHER       : 
      CLOUDY TO OVERCAST WITH HEAVY SQUALLY SHOWERS
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT  SCT 4000 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) : 12000 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 4.0-6.0 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     GALE FORCE EAST TO NORTHEASTERLY WINDS,  CLOUDY
     TO OVERCAST WITH HEAVY SQUALLY SHOWERS.=

    ===================================================================
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 07:30 HKT on 15 Oct 17

    VHHK SIGMET 13 VALID 142000/150200 VHHH- VHHK HONG KONG FIR TC KHANUN PSN N1942 E11612 CB OBS AT 2000Z WI 210NM OF TC CENTRE TOP FL500 NC FCST AT 0200Z TC CENTRE PSN N2000 E11512= VHHK SIGMET 16 VALID 142330/150300 VHHH- VHHK HONG KONG FIR TC KHANUN PSN N1948 E11542 CB OBS AT 2100Z WI 210NM OF TC CENTRE TOP FL500 NC FCST AT 0300Z TC CENTRE PSN N2000 E11424=

    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 08:45 HKT 15/Oct/2017

    Tropical Cyclone Warning Bulletin

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

    The No. 8 Northeast Gale or Storm Signal was issued at 8:40 a.m.

    This means that winds with mean speeds of 63 kilometres per hour or more are expected from the northeast quarter.

    At 9 a.m., Typhoon Khanun was centred about 260 kilometres south-southeast of Hong Kong (near 20.0 degrees north 114.8 degrees east) and is forecast to move west-northwest at about 25 kilometres per hour across the northern part of the South China Sea in the general direction of Leizhou Peninsula to Hainan Island.

    Local winds were strengthening with gales over offshore waters and occasional storm force winds on parts of high ground. Khanun is forecast to pass about 200 kilometres southwest of Hong Kong in the afternoon. The Gale or Storm Signal No. 8 is expected to remain in force for most of the time during the day.

    Northerlies are now affecting Hong Kong and will gradually change to east to northeasterlies. Areas which were previously sheltered may become exposed. Members of the public should stay on the alert.

    Tides are currently running more than 0.5 metres above normal. A high tide will occur tonight and cause flooding in some low-lying areas.

    Outer rainbands of Khanun are bringing occasional heavy showers and squalls to Hong Kong. Seas will also be very rough with swells. Members of the public are advised to stay away from the shoreline and not to engage in water sports.

    In the past hour, the maximum sustained winds recorded at Tate's Cairn, Waglan Island and Cheung Chau were 98, 81 and 60 kilometres per hour with maximum gusts 114, 95 and 99 kilometres per hour respectively.

    (Precautionary Announcements with No. 8 Signal)

    1. Complete all precautions in your home. Lock all windows and doors, fit bars into position and insert reinforced shutters and gates if they are available. Adhesive tape fixed to large window-panes in exposed positions will reduce damage by broken glass. Storm water drains should be cleared of leaves and rubbish.

    2. Do not stand near windows on the exposed side of your home. Move all furniture and valuables away from these areas. Make sure you have a safe place to shelter, should windows be broken.

    3. Owners of neon signs are reminded that they should now arrange for the electricity supply to their signs to be cut off.

    4. Please listen to radio or watch TV for the latest weather information broadcast. You can also browse the Hong Kong Observatory's web site for the information.
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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 09:30 HKT 15/Oct/2017


    Tropical Cyclone Warning

    At 150000 UTC, Typhoon Khanun (1720) with central pressure 955 hectopascals was centred within 60 nautical miles of two zero point zero degrees north (20.0 N) one one four point nine degrees east (114.9 E) and is forecast to move west-northwest at about 14 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 80 knots.

    Radius of over 33 knot winds 180 nautical miles over northern semicircle, 120 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 300 nautical miles over northern semicircle, 270 nautical miles elsewhere.

    Forecast position and intensity at 160000 UTC
    Two zero point five degrees north (20.5 N)
    One zero nine point nine degrees east (109.9 E)
    Maximum winds 55 knots.

    Forecast position and intensity at 170000 UTC
    One eight point five degrees north (18.5 N)
    One zero eight point zero degrees east (108.0 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 180000 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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