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Bulletin issued at 01:02 HKT 20/Oct/2017

At 1 a.m. at the Hong Kong Observatory the air temperature was 23 degrees Celsius and the relative humidity 75 per cent.

The air temperatures at other places were:

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


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


Climatological Information for 20 Oct

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Bulletin updated at 00:45 HKT 20/Oct/2017

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

The northeast monsoon affected the coast of Guangdong yesterday. Locally, it was mainly cloudy in the morning and at night. It was dry with sunny periods during the day. Under the influence of a dry northeast monsoon, fine weather will persist over southern China in the next few days.

At 11 p.m. last night, Typhoon Lan was centred about 1010 kilometres south-southeast of Okinawa. It is forecast to move north at about 14 kilometres per hour across the seas east of the Philippines and intensify progressively.

Weather forecast for Hong Kong

Cloudy periods at first. Mainly fine and dry during the day. Temperatures will range between 23 and 29 degrees. Moderate north to northeasterly winds, fresh at times.

Outlook : Remaining fine and dry in the following few days. Slightly cooler with relatively large temperature difference between day and night early next week.


(The above forecast period is valid up to 23:59 HKT today, 20/10/2017; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

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SOUTH CHINA COASTAL WATERS
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Bulletin issued at 23:30 HKT 19/Oct/2017

Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 19 October 2017

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

Weather Situation:
The northeast monsoon is affecting the south China coastal waters.

At 11 p.m., Typhoon Lan with maximum sustained winds of about 140 kilometres per hour near its centre was located near 17.3 degrees north, 130.0 degrees east. It is forecast to move north at about 14 kilometres per hour across the seas east of the Philippines and intensify progressively.

Area forecasts for the next 24 hours

Hong Kong Adjacent Waters:
North to northeast force 5 to 6.
Moderate to rough seas.

Nan'ao:
North to northeast force 6 to 7, occasionally force 8.
Rough to very rough seas.

Shanwei, South of Hong Kong and Shangchuan Dao:
North to northeast force 5 to 6, occasionally force 7.
Moderate to rough seas.

Outlook for the next 48 hours
North to northeasterly winds of force 6 to 7, up to force 8 in east at first.

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

Waglan Island Wind north force 5
  Visibility 24 Kilometres

Shantou Wind east-northeast force 1
  Visibility 30 Kilometres

Dongsha Wind northeast force 5
  Visibility 10 Kilometres

Huangmaozhou Wind north force 4

Macau Wind north force 4
  Visibility 21 Kilometres

Xisha Wind northeast force 3
  Visibility 14 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
  • Descriptive Terms of Wind Speeds
  • Visibility Readings in Hong Kong Waters
  • Map showing forecast areas
  • Tidal Information

    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 20/OCT/2017
    (Next update at 9:00-9:30 HKT 20/OCT/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE NORTHEAST MONSOON IS AFFECTING THE COAST OF GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  020/5-10
       OFFSHORE:  020/15-20                            21-29
   B.   2000 FT:  020/15-20                            19
   C.   5000 FT:  040/10                               15
   D.  10000 FT:  360/10                               13
   E.  18000 FT:  340/10                               MS1
   F.  24000 FT:  240/5                                MS12
   G.  30000 FT:  220/15                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      2100-2500 FT.
   I. WEATHER       : 
      MAINLY FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT.
   K. VISIBILITY    : 10 KM.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 12200 FT
   M. TURBULENCE    : MOD OFFSHORE AND  NEAR HILLS.
   N. SEA STATE     : 1.5-2.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTH TO NORTHEASTERLY WINDS.
     MAINLY FINE.=

    ===================================================================
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

    There is no tropical cyclone warning for shipping*.




    *Tropical cyclone warnings for shipping are issued by the Hong Kong Observatory for tropical cyclones located within the area bounded by 105E and 125E , 10N and 30N.




    For other tropical cyclone related information, please visit the World Meteorological Organization Web Site - Severe Weather Information Centre.

    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 20/Oct/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     27.9 C
Minimum Air Temperature                     23.4 C
Grass Minimum Temperature                   23.3 C
Relative Humidity                        62 - 76 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2540.9 mm
Against an average of                     2310.5 mm

Other Stations                Min                  Max
King's Park                  22.8 C               27.7 C
Wong Chuk Hang               23.8 C               29.6 C
Ta Kwu Ling                  21.8 C               27.3 C
Lau Fau Shan                 22.0 C               26.6 C
Tai Po                       22.1 C               27.1 C
Sha Tin                      23.0 C               28.0 C
Tuen Mun                     23.0 C               27.0 C
Tseung Kwan O                21.9 C               27.8 C
Sai Kung                     23.0 C               26.9 C
Cheung Chau                  22.0 C               27.4 C
Chek Lap Kok                 23.8 C               27.9 C
Tsing Yi                     22.2 C               29.2 C
Shek Kong                    22.2 C               27.7 C
Tsuen Wan Ho Koon            21.4 C               26.6 C
Tsuen Wan Shing Mun Valley   21.0 C               28.9 C
Hong Kong Park               23.8 C               28.3 C
Shau Kei Wan                 22.8 C               28.9 C
Kowloon City                 22.4 C               28.2 C
Happy Valley                 23.8 C               29.6 C
Wong Tai Sin                 22.7 C               28.1 C
Stanley                      23.5 C               28.8 C
Kwun Tong                    22.8 C               28.5 C
Sham Shui Po                 23.2 C               28.3 C
Kai Tak Runway Park          23.7 C               28.2 C
Yuen Long Park               23.3 C               28.3 C
Tai Mei Tuk               21.8 C               26.5 C

Duration of sunshine (King's Park):              5.0 H
The mean UV index recorded at King's Park yesterday was 3,
the UV intensity was Moderate.
The maximum UV index for yesterday was 7.
Sea surface temperature (Waglan Island):        27.1 C 

Yesterday's (19 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                           0.11
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 19 Oct
     2003copy right image | Important notices | Privacy policy Last revision date: <20 Oct 2017> 

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