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Bulletin issued at 05:02 HKT 15/Oct/2017

At 5 a.m. at the Hong Kong Observatory the air temperature was 21 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 21 degrees;
Wong Chuk Hang 21 degrees;
Ta Kwu Ling 20 degrees;
Lau Fau Shan 21 degrees;
Tai Po 20 degrees;
Sha Tin 21 degrees;
Tuen Mun 21 degrees;
Tseung Kwan O 20 degrees;
Sai Kung 21 degrees;
Cheung Chau 20 degrees;
Chek Lap Kok 21 degrees;
Tsing Yi 22 degrees;
Shek Kong 20 degrees;
Tsuen Wan Ho Koon 19 degrees;
Tsuen Wan Shing Mun Valley 20 degrees;
Hong Kong Park 20 degrees;
Shau Kei Wan 21 degrees;
Kowloon City 20 degrees;
Happy Valley 21 degrees;
Wong Tai Sin 20 degrees;
Stanley 21 degrees;
Kwun Tong 21 degrees;
Sham Shui Po 20 degrees;
Kai Tak Runway Park 22 degrees;
Yuen Long Park 21 degrees;
Tai Mei Tuk 20 degrees.

Between 3:45 and 4:45 a.m., the rainfall recorded in various regions were:

Tai Po 0 to 3 mm;
Sai Kung 0 to 3 mm;
Sha Tin 0 to 3 mm;
Islands District 0 to 2 mm;
North District 0 to 2 mm;
Tsuen Wan 0 to 2 mm;
Yuen Long 0 to 2 mm;
Sham Shui Po 0 to 2 mm;
Wong Tai Sin 1 mm;
Southern District 1 mm;
Central & Western District 0 to 1 mm;
Kwai Tsing 1 mm;
Eastern District 1 mm;
Yau Tsim Mong 1 mm;
Tuen Mun 0 to 1 mm;
Kowloon City 1 mm;
Wan Chai 1 mm;
Kwun Tong 1 mm.

Here is the information on Typhoon Khanun:
Location: 19.8 degrees north, 115.9 degrees east; Maximum sustained wind near its centre: 130 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 04:45 HKT 15/Oct/2017

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

Weather forecast for today

Strong northerly winds, occasionally gales offshore and on high ground. Winds will strengthen significantly during the day and gradually become east to northeasterlies. Cloudy to overcast with occasional heavy showers and squalls. Seas will be 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 21:00 HKT 14/Oct/2017

HURRICANE WARNING AREAS: PRATAS AND PARACEL.
STORM WARNING AREA: KWANGTUNG.
GALE WARNING AREAS: HONG KONG, TAIWAN STRAIT, BASHI, BALINTANG AND SCARBOROUGH.

GENERAL SITUATION AT 140900 UTC:
FOR DETAILS ON SEVERE TROPICAL STORM 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 141300 UTC:

HONG KONG= N TO NE 6-7, OCNL 8. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL E TO NE 2-3 M, SE 2 M. TEMP 22-25 C. =
KWANGTUNG= N TO NE 8-9, N TO NW 10-11 IN WEST LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, 10-12 M IN WEST LATER. SWELL E TO NE 3-5 M, SE 3-4 M. =
TAIWAN STRAIT= NE 8-9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M. SWELL NE 5 M, SE 3 M. =
BASHI= E TO SE 6-7, 8-9 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, 6-8 M AT FIRST. SWELL E TO NE 5 M, SE 3-5 M. =
PRATAS= CYCLONIC UP TO 12, SE 9-10 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 14 M, 8-10 M LATER. SWELL E TO NE 5 M, SE 3-5 M. =
BALINTANG= E TO SE 6-7, 8-9 AT FIRST. DOWN TO 500 M IN FRQ HEAVY 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, 8-9 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, 6-8 M AT FIRST. SWELL NE 5 M. =
PARACEL= N TO NW 8-9, CYCLONIC UP TO 12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, UP TO 14 M LATER. SWELL E TO NE 5 M, SE 3-5 M. =
TONKIN= N TO NW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS.. SEA 3-4 M. SWELL E TO NE 2-3 M. =
DANANG= N TO NW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS.. SEA 3-4 M. SWELL E TO NE 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.


  • 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 04:00 HKT on 15 Oct 17

    VHHK SIGMET 10 VALID 141715/142115 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1642 E11400 - N1836 E11218 - N1924 E11212 - N2236 E11436 - N2318 E11730 - N2100 E11730 TOP FL450 MOV WNW 10KT NC= VHHK SIGMET 11 VALID 142000/150200 VHHH- VHHK HONG KONG FIR TC KHANUN PSN N1942 E11624 CB OBS AT 2000Z WI 210NM OF TC CENTRE TOP FL500 NC FCST AT 0200Z TC CENTRE PSN N2000 E11524= 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=

    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 04:45 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 5 a.m., Typhoon Khanun was estimated to be about 330 kilometres south-southeast of Hong Kong (near 19.8 degrees north 115.9 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.

    In the past few hours, Khanun continued to edge closer to the coast of Guangdong and showed signs of further intensification. According to the present forecast track, Khanun will pass about 200 kilometres southwest of Hong Kong in the late afternoon. Local winds will strengthen significantly during the day. The Observatory will issue higher signal this morning.

    Under the influence of the outer rainbands of Khanun, there will be occasional heavy showers and squalls today. There will also be flooding in low-lying areas. 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 85, 67 and 57 kilometres per hour respectively.

    (Precautionary Announcements with No. 3 Signal)

    1. You are advised not to delay in taking all precautions to protect your home or property. Make sure now that all loose objects are secure. Porch furniture, flower pots and other objects likely to be blown away should be taken indoors. Check again and make sure all windows and doors can be securely locked.

    2. Since seas are rough and there are swells, you are advised to stay away from the shoreline and not to engage in water sports.

    3. People should avoid walking or working in areas exposed to gales and squalls. Drivers using highways and flyovers should be alert to violent gusts.

    4. Storm water drains should be cleared of leaves and rubbish, this applies particularly to dwellers in low-lying areas.

    5. 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 03:30 HKT 15/Oct/2017


    Tropical Cyclone Warning

    At 141800 UTC, Typhoon Khanun (1720) with central pressure 965 hectopascals was centred within 60 nautical miles of one nine point five degrees north (19.5 N) one one six point seven degrees east (116.7 E) and is forecast to move northwest or west-northwest at about 14 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 70 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 151800 UTC
    Two zero point seven degrees north (20.7 N)
    One one one point two degrees east (111.2 E)
    Maximum winds 85 knots.

    Forecast position and intensity at 161800 UTC
    One eight point seven degrees north (18.7 N)
    One zero eight point zero degrees east (108.0 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 171800 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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