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Bulletin issued at 13:02 HKT 14/Oct/2017

At 1 p.m. at the Hong Kong Observatory the air temperature was 25 degrees Celsius and the relative humidity 66 per cent.
During the past hour the mean UV Index recorded at King's Park was 3. The intensity of UV radiation was moderate.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.
The Fire Danger Warning is Yellow and the fire risk is high.

The air temperatures at other places were:

King's Park 25 degrees;
Wong Chuk Hang 27 degrees;
Ta Kwu Ling 25 degrees;
Lau Fau Shan 24 degrees;
Tai Po 24 degrees;
Sha Tin 25 degrees;
Tuen Mun 25 degrees;
Tseung Kwan O 25 degrees;
Sai Kung 25 degrees;
Cheung Chau 25 degrees;
Chek Lap Kok 26 degrees;
Tsing Yi 25 degrees;
Shek Kong 25 degrees;
Tsuen Wan Ho Koon 24 degrees;
Tsuen Wan Shing Mun Valley 25 degrees;
Hong Kong Park 25 degrees;
Shau Kei Wan 25 degrees;
Kowloon City 25 degrees;
Happy Valley 27 degrees;
Wong Tai Sin 26 degrees;
Stanley 26 degrees;
Kwun Tong 25 degrees;
Sham Shui Po 25 degrees;
Kai Tak Runway Park 26 degrees;
Yuen Long Park 25 degrees;
Tai Mei Tuk 25 degrees.

Here is the information on Severe Tropical Storm Khanun:
Location: 17.5 degrees north, 118.1 degrees east; Maximum sustained wind near its centre: 105 km/h.


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


Climatological Information for 14 Oct

Regional Weather in Hong Kong

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Hong Kong Climatology


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

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

Weather forecast for this afternoon and tonight

Mainly cloudy. It will be dry at first. A few rain patches tonight. Fresh north to northeasterly winds, occasionally strong offshore and on high ground. Winds will strengthen later. There will be swells.

Outlook : Windy with heavy squally showers in the next couple of days. Weather will improve midweek next week.


(The above forecast period is valid up to 23:59 HKT today, 14/10/2017; 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 14/Oct/2017

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

GENERAL SITUATION AT 132100 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 RAIN OVER THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 140100 UTC:

HONG KONG= N TO NE 6-7, OCNL 8 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS LATER. SEA 3-4 M, UP TO 6 M LATER. SWELL E TO NE 2-3 M, SE UP TO 2 M. TEMP 29-23 C. =
KWANGTUNG= N TO NE 7-8, 9 IN E. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, 8 M IN E. SWELL E TO NE 3-5 M, SE 3 M. =
TAIWAN STRAIT= N TO NE 9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 8 M. SWELL NE 5 M, SE 3 M. =
BASHI= E TO NE 7-8, OCNL 9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 8 M. SWELL NE 5 M, SE 3-5 M. =
PRATAS= N TO NE 8-9, CYCLONIC 10-11 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, 10-12 M LATER. SWELL NE 5 M, SE 3-5 M. =
BALINTANG= E TO NE 7-8, OCNL 9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 8 M. SWELL NE 5 M, SE 3-5 M. =
SCARBOROUGH= CYCLONIC 10-11, S 10-11 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 10-12 M. SWELL NE 5 M. =
PARACEL= N TO NE 7-8, CYCLONIC 10-11 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, 10-12 M LATER. SWELL NE 5 M. =
TONKIN= N TO NE 6-7, NW 6-7 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2-3 M. =
DANANG= N TO NE 6-7, NW 6-7 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL 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.


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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 14/Oct/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 p.m. on 14 October 2017

    Warnings:
    Gale force winds in all areas.

    Weather Situation:
    At noon, Severe Tropical Storm Khanun with maximum sustained winds of about 105 kilometres per hour near its centre was located at 17.4 degrees north, 118.2 degrees east. It is forecast to move northwest at about 15 kilometres per hour across the South China Sea and intensify. It will move in the general direction of Hainan Island to Leizhou Peninsula. Under the combined effect of Khanun and the northeast monsoon, 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 to northeast force 6 to 7, occasionally force 8 later.
    Squally showers and thunderstorms later.
    Rough to very rough seas.

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

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

    Outlook for the next 48 hours
    Northeasterly winds of force 9 to 10, cyclonic winds up to force 12 in west at first. Heavy squally showers and thunderstorms.

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

    Waglan Island Wind north force 6
      Visibility 24 Kilometres

    Shantou Wind northeast force 2
      Visibility 24 Kilometres

    Dongsha Wind north-northeast force 6
      Visibility 9 Kilometres in rain

    Macau Wind north force 3
      Visibility 15 Kilometres

    Xisha Wind north force 3
      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 12:00 HKT 14/OCT/2017
    (Next update at 17:30 HKT 14/OCT/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS, SEV TURB AND SEV GUSTS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT NOON., SEVERE TROPICAL STORM KHANUN WAS
     LOCATED NEAR 17.4 DEGREES NORTH, 118.2 DEGREES
     EAST. IT IS FORECAST TO MOVE NORTHWEST  AT ABOUT
     8 KNOTS ACROSS THE SOUTH CHINA SEA AND
     INTENSIFY. IT WILL MOVE IN THE GENERAL DIRECTION
     OF HAINAN ISLAND TO LEIZHOU PENINSULA. UNDER THE
     COMBINED EFFECT OF KHANUN AND THE NORTHEAST
     MONSOON, IT WILL BE WINDY OVER THE SOUTH CHINA
     COASTAL WATERS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1200 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  010/15-20
       OFFSHORE:  010/25-30                            26-30
   B.   2000 FT:  010/30G40                            21
   C.   5000 FT:  050/30-35                            16
   D.  10000 FT:  040/25-30                            13
   E.  18000 FT:  060/25-30                            0
   F.  24000 FT:  060/30                               MS11
   G.  30000 FT:  060/15                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      1800-2100 FT
   I. WEATHER       : 
      MAINLY CLOUDY.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT  SCT 4500 FT.
   K. VISIBILITY    : 8 KM.
   L. 0 DEG. C LEVEL: 18000 FT      10 DEG. C LEVEL(S) : 12000 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     FRESH TO STRONG NORTHEASTERLY WINDS,
     OCCASIONALLY GALE FORCE WINDS OFFSHORE AND ON
     HIGH GROUND. 
     CLOUDY WITH A FEW 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 13:12 HKT on 14 Oct 17

    VHHK SIGMET 4 VALID 140425/140825 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI SE OF LINE N1800 E11254 - N2142 E11730 TOP FL450 MOV WNW 08KT NC= VHHK SIGMET 5 VALID 140515/140915 VHHH- VHHK HONG KONG FIR EMBD TS FCST SE OF LINE N1800 E11254 - N2142 E11730 TOP FL450 MOV WNW 08KT NC=

    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 12:45 HKT 14/Oct/2017

    Tropical Cyclone Warning Bulletin

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

    The Standby Signal, No. 1 is in force.

    This means that a tropical cyclone now centred within about 800 kilometres of Hong Kong may affect us.

    At 1 p.m., Severe Tropical Storm Khanun was estimated to be about 670 kilometres southeast of Hong Kong (near 17.5 degrees north 118.1 degrees east) and is forecast to move northwest at about 15 kilometres per hour across the South China Sea and intensify. It will move in the general direction of Hainan Island to Leizhou Peninsula.
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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 12:30 HKT 14/Oct/2017


    Tropical Cyclone Warning

    At 140300 UTC, Severe Tropical Storm Khanun (1720) with central pressure 980 hectopascals was centred within 60 nautical miles of one seven point three degrees north (17.3 N) one one eight point three degrees east (118.3 E) and is forecast to move northwest at about 8 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 55 knots.

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

    Forecast position and intensity at 150300 UTC
    One nine point three degrees north (19.3 N)
    One one four point four degrees east (114.4 E)
    Maximum winds 65 knots.

    Forecast position and intensity at 160300 UTC
    Two zero point zero degrees north (20.0 N)
    One zero nine point eight degrees east (109.8 E)
    Maximum winds 60 knots.

    Forecast position and intensity at 170300 UTC
    One nine point zero degrees north (19.0 N)
    One zero six point nine degrees east (106.9 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 180300 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 14/Oct/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     30.6 C
Minimum Air Temperature                     24.5 C
Grass Minimum Temperature                   24.4 C
Relative Humidity                        53 - 73 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2461.4 mm
Against an average of                     2286.4 mm

Other Stations                Min                  Max
King's Park                  23.9 C               29.9 C
Wong Chuk Hang               25.0 C               31.4 C
Ta Kwu Ling                  22.7 C               30.0 C
Lau Fau Shan                 23.0 C               28.9 C
Tai Po                       23.2 C               29.4 C
Sha Tin                      23.4 C               30.3 C
Tuen Mun                     23.9 C               30.3 C
Tseung Kwan O                23.1 C               31.6 C
Sai Kung                     24.1 C               28.6 C
Cheung Chau                  23.4 C               31.2 C
Chek Lap Kok                 24.5 C               30.9 C
Tsing Yi                     23.9 C               30.7 C
Shek Kong                    23.2 C               30.3 C
Tsuen Wan Ho Koon            22.2 C               28.8 C
Tsuen Wan Shing Mun Valley   22.4 C               31.1 C
Hong Kong Park               24.9 C               30.0 C
Shau Kei Wan                 24.3 C               31.5 C
Kowloon City                 23.7 C               30.0 C
Happy Valley                 24.9 C               32.4 C
Wong Tai Sin                 23.4 C               31.1 C
Stanley                      24.7 C               32.4 C
Kwun Tong                    23.4 C               30.8 C
Sham Shui Po                 24.2 C               31.4 C
Kai Tak Runway Park          24.0 C               30.7 C
Yuen Long Park               24.4 C               31.2 C
Tai Mei Tuk               23.0 C               29.2 C

Duration of sunshine (King's Park):              10.7 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):        28.8 C 

Yesterday's (13 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                           0.11
Sai Wan Ho                          0.09
King's Park                         0.15
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 13 Oct
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