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Bulletin issued at 10:02 HKT 16/Oct/2017

At 10 a.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 94 per cent.
During the past hour the mean UV Index recorded at King's Park was 3. The intensity of UV radiation was moderate.

The air temperatures at other places were:

King's Park 28 degrees;
Wong Chuk Hang 29 degrees;
Ta Kwu Ling 24 degrees;
Lau Fau Shan 25 degrees;
Tai Po 29 degrees;
Sha Tin 29 degrees;
Tuen Mun 28 degrees;
Tseung Kwan O 28 degrees;
Sai Kung 28 degrees;
Cheung Chau 29 degrees;
Chek Lap Kok 29 degrees;
Tsing Yi 29 degrees;
Shek Kong 28 degrees;
Tsuen Wan Ho Koon 27 degrees;
Tsuen Wan Shing Mun Valley 29 degrees;
Hong Kong Park 28 degrees;
Shau Kei Wan 28 degrees;
Kowloon City 29 degrees;
Happy Valley 29 degrees;
Wong Tai Sin 28 degrees;
Stanley 29 degrees;
Kwun Tong 28 degrees;
Sham Shui Po 30 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 28 degrees;
Tai Mei Tuk 26 degrees.

Between 8:45 and 9:45 a.m., the rainfall recorded in various regions were:

Islands District 0 to 13 mm;
North District 0 to 5 mm;
Tai Po 0 to 3 mm;
Tuen Mun 0 to 1 mm;
Yuen Long 0 to 1 mm.

Here is the information on Tropical Storm Khanun at 10 a.m.:
Location: 20.1 degrees north, 109.7 degrees east.


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


Climatological Information for 16 Oct

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 09:45 HKT 16/Oct/2017

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

Showers are affecting the south China coast.

At 10 a.m., Tropical Storm Khanun was centred about 70 kilometres west of Haikou. It is forecast to move west-southwest at about 15 kilometres per hour across Beibu Wan and weaken. Tropical Depression Lan has intensified into a tropical storm. At 10 a.m., Lan was centred about 250 kilometres west-northwest of Yap. It is forecast to move northwest at about 15 kilometres per hour across the seas east of the Philippines and intensify gradually.

Weather forecast for today

Mainly cloudy with occasional showers. Sunny intervals. Fresh easterly winds, occasionally strong offshore and on high ground at first. There will be swells at first.

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


(The above forecast period is valid up to 23:59 HKT today, 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 09:00 HKT 16/Oct/2017

GALE WARNING AREAS: TAIWAN STRAIT, TONKIN AND DANANG.

GENERAL SITUATION AT 152100 UTC:
FOR DETAILS ON SEVERE TROPICAL STORM KHANUN (1720), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 160100 UTC:

HONG KONG= E UP TO 7, NE UP TO 7 LATER. DOWN TO 2000 M IN OCNL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 2 M. TEMP 28-23 C. =
KWANGTUNG= E TO SE UP TO 7, NE UP TO 7 LATER. DOWN TO 1000 M IN HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 3 M. =
TAIWAN STRAIT= NE 7, UP TO 8 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 4 M, UP TO 6 M LATER. SWELL SW 3 M. =
BASHI= E TO SE 6-7, NE UP TO 7 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 3 M. =
PRATAS= E TO SE 6-7, NE UP TO 7 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 3 M. =
BALINTANG= E TO SE 6-7, NE UP TO 7 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 3 M. =
SCARBOROUGH= S 6, NE 6-7 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NW 2-3 M. =
PARACEL= SE 5-6, OCNL 7, NW UP TO 7 LATER. DOWN TO 1000 M IN HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 3-5 M. =
TONKIN= CYCLONIC UP TO 9, NE 7 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 8 M, 4 M LATER. SWELL NE 3-5 M. =
DANANG= NW UP TO 8, 6-7 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M, 3-4 M LATER. SWELL NE 3-5 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 09:30 HKT 16/Oct/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 16 October 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    An easterly airstream is affecting the south China coastal waters.

    At 9 a.m., Tropical Storm Khanun with maximum sustained winds of about 85 kilometres per hour near its centre was located at 20.2 degrees north, 109.8 degrees east. It is forecast to move west-southwest at about 15 kilometres per hour across Beibu Wan and weaken.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East up to force 7, becoming northeast up to force 7 later.
    Occasional squally showers and thunderstorms.
    Rough seas.

    Nan'ao and Shanwei:
    East to southeast up to force 7, becoming northeast up to force 7 later.
    Heavy squally showers and thunderstorms.
    Rough to very rough seas.

    South of Hong Kong and Shangchuan Dao:
    East to southeast up to force 7, becoming northeast up to force 7 later.
    Squally showers and thunderstorms.
    Rough to very rough seas.

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

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

    Waglan Island Wind east force 4
      Visibility 10 Kilometres

    Shantou Wind northeast force 2
      Visibility 9 Kilometres in showers

    Dongsha Wind east-southeast force 2
      Visibility 10 Kilometres

    Macau Wind southeast force 2
      Visibility 11 Kilometres

    Xisha Wind south-southeast force 1
      Visibility 30 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 09:30 HKT 16/OCT/2017
    (Next update at 17:30 HKT 16/OCT/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     KHANUN HAS WEAKEN INTO A TROPICAL STORM. AT 9
     A.M, KHANUN WAS LOCATED AT 20.2 DEGREES NORTH
     109.8 DEGREES EAST AND IS FORECAST TO MOVE
     WEST-SOUTHWEST AT ABOUT 8 KNOTS ACROSS BEIBU WAN
     AND WEAKEN.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  110/15-20
       OFFSHORE:  120/25-30                            27-30
   B.   2000 FT:  120/30                               23
   C.   5000 FT:  110/30                               18
   D.  10000 FT:  150/30                               11
   E.  18000 FT:  150/25                               0
   F.  24000 FT:  150/35                               MS8
   G.  30000 FT:  140/35                               MS21
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      MAINLY CLOUDY  WITH OCCASIONAL SHOWERS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1400 FT  SCT 2200 FT
   K. VISIBILITY    : 10 KM. TEMPO 4000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 18000 FT      10 DEG. C LEVEL(S) : 10600 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 26 DEG
IV.  FURTHER OUTLOOK: 
     FRESH EASTERLIES TO NORTHEASTERLIES. STRONG
     OFFSHORE AND ON HIGH GROUND AT FIRST. CLOUDY
     WITH A FEW 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 02:56 HKT on 16 Oct 17

    VHHK SIGMET 10 VALID 151500/151900 VHHH- VHHK HONG KONG FIR SEV TURB FCST W OF E115 FL340/400 STNR NC= VHHK SIGMET 11 VALID 151900/152300 VHHH- VHHK HONG KONG FIR SEV TURB FCST W OF E115 FL340/400 STNR 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 09:30 HKT 16/Oct/2017


    Tropical Cyclone Warning

    Severe Tropical Storm Khanun (1720) has weakened into a Tropical Storm with central pressure 994 hectopascals. At 160000 UTC, it was centred within 60 nautical miles of two zero point one degrees north (20.1 N) one zero nine point nine degrees east (109.9 E) and is forecast to move west-southwest at about 8 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 170000 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 16/Oct/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     26.9 C
Minimum Air Temperature                     20.4 C
Grass Minimum Temperature                   21.6 C
Relative Humidity                        78 - 97 Percent
Rainfall                                    20.7 mm 
Total rainfall since 1st January          2482.5 mm
Against an average of                     2300.6 mm

Other Stations                Min                  Max
King's Park                  20.4 C               26.9 C
Wong Chuk Hang               21.0 C               27.8 C
Ta Kwu Ling                  19.5 C               23.1 C
Lau Fau Shan                 19.7 C               22.4 C
Tai Po                       19.2 C               26.8 C
Sha Tin                      20.6 C               28.0 C
Tuen Mun                     19.9 C               24.2 C
Tseung Kwan O                20.1 C               26.9 C
Sai Kung                     20.4 C               27.7 C
Cheung Chau                  19.5 C               26.4 C
Chek Lap Kok                 20.7 C               28.3 C
Tsing Yi                     21.1 C               27.8 C
Shek Kong                    19.9 C               27.5 C
Tsuen Wan Ho Koon            18.8 C               25.4 C
Tsuen Wan Shing Mun Valley   19.9 C               27.1 C
Hong Kong Park               20.2 C               27.2 C
Shau Kei Wan                 20.7 C               27.3 C
Kowloon City                 19.8 C               26.8 C
Happy Valley                 21.2 C               27.8 C
Wong Tai Sin                 20.0 C               26.4 C
Stanley                      21.3 C               27.4 C
Kwun Tong                    21.1 C               27.1 C
Sham Shui Po                 20.2 C               27.3 C
Kai Tak Runway Park          21.4 C               27.9 C
Yuen Long Park               20.5 C               23.0 C
Tai Mei Tuk               19.2 C               26.4 C

Duration of sunshine (King's Park):              0.3 H
The mean UV index recorded at King's Park yesterday was 2,
the UV intensity was Low.
The maximum UV index for yesterday was 5.
Sea surface temperature (Waglan Island):        28.2 C 

Yesterday's (15 Oct 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 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                           0.09
Tap Mun                             0.09
Kat O                               0.10
Yuen Ng Fan                         0.13
Tai Mei Tuk                         0.13
Sha Tau Kok                         0.11
Kwun Tong                           0.12
Sai Wan Ho                          0.10
King's Park                         0.15
Tsim Bei Tsui                       0.14
Cape D'Aguilar                      0.14
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 15 Oct
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