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Bulletin issued at 01:02 HKT 17/Oct/2017

At 1 a.m. at the Hong Kong Observatory the air temperature was 25 degrees Celsius and the relative humidity 97 per cent.

Please be reminded that:

The Strong Monsoon Signal has been issued.

The air temperatures at other places were:

King's Park 25 degrees;
Wong Chuk Hang 26 degrees;
Ta Kwu Ling 22 degrees;
Lau Fau Shan 22 degrees;
Tai Po 23 degrees;
Sha Tin 23 degrees;
Tuen Mun 22 degrees;
Tseung Kwan O 24 degrees;
Sai Kung 24 degrees;
Cheung Chau 25 degrees;
Chek Lap Kok 23 degrees;
Tsing Yi 25 degrees;
Shek Kong 22 degrees;
Tsuen Wan Ho Koon 24 degrees;
Tsuen Wan Shing Mun Valley 24 degrees;
Hong Kong Park 25 degrees;
Shau Kei Wan 24 degrees;
Kowloon City 24 degrees;
Happy Valley 25 degrees;
Wong Tai Sin 25 degrees;
Stanley 25 degrees;
Kwun Tong 24 degrees;
Sham Shui Po 24 degrees;
Kai Tak Runway Park 25 degrees;
Yuen Long Park 23 degrees;
Tai Mei Tuk 23 degrees.

Between 11:45 p.m. and 0:45 a.m., the rainfall recorded in various regions were:

Tai Po 5 to 18 mm;
Sai Kung 7 to 15 mm;
Sha Tin 7 to 13 mm;
North District 3 to 13 mm;
Kwun Tong 8 to 12 mm;
Wong Tai Sin 8 to 11 mm;
Wan Chai 5 to 10 mm;
Islands District 0 to 8 mm;
Yuen Long 0 to 8 mm;
Eastern District 5 to 8 mm;
Kwai Tsing 3 to 7 mm;
Southern District 2 to 7 mm;
Tsuen Wan 1 to 7 mm;
Kowloon City 5 to 7 mm;
Sham Shui Po 5 to 6 mm;
Yau Tsim Mong 4 to 6 mm;
Tuen Mun 0 to 4 mm;
Central & Western District 2 to 4 mm.


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


Climatological Information for 17 Oct

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Bulletin updated at 00:45 HKT 17/Oct/2017

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

A strong easterly airstream affected the coast of eastern Guangdong yesterday. Locally, it was mainly cloudy with sunny intervals and occasional showers. More than 20 millimetres of rainfall were recorded over many places. A dry continental airstream will bring fine weather to southern China in the middle and latter parts of this week. Tropical Cyclone Khanun weakened from a typhoon into an area of low pressure progressively yesterday.

Besides, the area of low pressure over the seas east of the Philippines intensified into a tropical storm gradually yesterday and was named Lan. At 11 p.m. last night, Lan was centred about 410 kilometres west-northwest of Yap. It is forecast to move west-northwest at about 10 kilometres per hour across the seas east of the Philippines and intensify progressively.

Weather forecast for Hong Kong

Mainly cloudy. A few showers at first. Sunny intervals during the day. Temperatures will range between 24 and 28 degrees. Fresh east to northeasterly winds, strong offshore at first.

Outlook : Becoming fine and dry in the following few days.


(The above forecast period is valid up to 23:59 HKT today, 17/10/2017; 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 16/Oct/2017

GALE WARNING AREAS: TAIWAN STRAIT, TONKIN AND DANANG.

GENERAL SITUATION AT 160900 UTC:
AN EASTERLY AIRSTREAM IS GENERALLY AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 161300 UTC:

HONG KONG= E TO NE 6-7. OCNL SHOWERS. SEA UP TO 4 M. SWELL NE UP TO 2 M. TEMP 24-28 C. =
KWANGTUNG= E TO NE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS AT FIRST. SEA UP TO 4 M. SWELL NE 2-3 M. =
TAIWAN STRAIT= NE 7, OCNL 8. ISOL SHOWERS AND TS. SEA UP TO 6 M. SWELL SW 2-3 M. =
BASHI= E TO NE 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL SW 2-3 M. =
PRATAS= E TO NE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2-3 M. =
BALINTANG= E TO NE 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL SW 2-3 M. =
SCARBOROUGH= E TO NE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 2-3 M. =
PARACEL= E TO NE 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 3-5 M. =
TONKIN= N TO NW 7, OCNL 8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 3 M. =
DANANG= N TO NW 7, OCNL 8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 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 23:30 HKT 16/Oct/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 16 October 2017

    Warnings:
    Strong winds in all areas.

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

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to northeast force 6 to 7.
    A few showers at first.
    Rough seas.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    East to northeast force 6 to 7.
    Isolated squally showers and thunderstorms at first.
    Rough seas.

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

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

    Waglan Island Wind northeast force 5
      Visibility 12 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 30 Kilometres

    Macau Wind north force 3
      Visibility 2200 Metres in rain

    Xisha Wind west force 2
      Visibility 26 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 17/OCT/2017
    (Next update at 9:00-9:30 HKT 17/OCT/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A STRONG EASTERLY AIRSTREAM IS AFFECTING THE
     SOUTH CHINA COASTAL AREAS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  040/10-15, OCNL 20
       OFFSHORE:  080/15-20, OCNL 25                   23-29
   B.   2000 FT:  080/20-25, OCNL 30                   22
   C.   5000 FT:  120/25                               18
   D.  10000 FT:  130/25                               10
   E.  18000 FT:  130/25                               0
   F.  24000 FT:  130/25                               MS8
   G.  30000 FT:  160/20                               MS23
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 2500 FT
   K. VISIBILITY    : 9 KM. TEMPO 3000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 18000 FT    10 DEG. C LEVEL(S) : 10200, 11000, 11600 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 2.5-3.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTHEASTERLY WINDS. SUNNY
     INTERVALS.=

    ===================================================================
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 15:30 HKT 16/Oct/2017


    Tropical Cyclone Warning

    Tropical Depression Khanun (1720) has weakened into an area of low pressure with central pressure 1002 hectopascals. At 160600 UTC, it was centred within 60 nautical miles of two zero point one degrees north (20.1 N) one zero nine point three degrees east (109.3 E).

    Maximum winds near the centre are estimated to be 20 knots.

    No further warnings on this area of low pressure will be issued by the Hong Kong Observatory unless re-intensification takes place.



    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 17/Oct/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     27.5 C
Minimum Air Temperature                     25.6 C
Grass Minimum Temperature                   24.9 C
Relative Humidity                        85 - 97 Percent
Rainfall                                    17.1 mm 
Total rainfall since 1st January          2499.6 mm
Against an average of                     2304.2 mm

Other Stations                Min                  Max
King's Park                  25.6 C               28.8 C
Wong Chuk Hang               25.6 C               29.6 C
Ta Kwu Ling                  21.8 C               27.7 C
Lau Fau Shan                 21.8 C               26.5 C
Tai Po                       23.6 C               28.7 C
Sha Tin                      24.0 C               29.0 C
Tuen Mun                     23.5 C               29.8 C
Tseung Kwan O                24.3 C               28.1 C
Sai Kung                     24.3 C               28.7 C
Cheung Chau                  24.7 C               28.9 C
Chek Lap Kok                 24.0 C               30.4 C
Tsing Yi                     25.9 C               29.3 C
Shek Kong                    22.7 C               29.4 C
Tsuen Wan Ho Koon            24.5 C               27.3 C
Tsuen Wan Shing Mun Valley   24.8 C               29.8 C
Hong Kong Park               24.5 C               29.0 C
Shau Kei Wan                 24.1 C               28.2 C
Kowloon City                 24.6 C               29.5 C
Happy Valley                 25.1 C               29.7 C
Wong Tai Sin                 24.9 C               28.3 C
Stanley                      25.2 C               29.5 C
Kwun Tong                    24.4 C               28.8 C
Sham Shui Po                 24.6 C               30.1 C
Kai Tak Runway Park          25.4 C               28.9 C
Yuen Long Park               22.4 C               29.6 C
Tai Mei Tuk               23.4 C               27.1 C

Duration of sunshine (King's Park):              1.5 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):        27.9 C 

Yesterday's (16 Oct 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 to
0.14 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                         0.14
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 16 Oct
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