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Bulletin issued at 05:02 HKT 18/Oct/2017

At 5 a.m. at the Hong Kong Observatory the air temperature was 25 degrees Celsius and the relative humidity 83 per cent.

The air temperatures at other places were:

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


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


Climatological Information for 18 Oct

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 04:45 HKT 18/Oct/2017

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

The northeast monsoon is affecting the coast of Guangdong.

At 5 a.m., Severe Tropical Storm Lan was centred about 630 kilometres west-northwest of Yap. It is forecast to move north at about 16 kilometres per hour across the seas east of the Philippines and intensify progressively.

Weather forecast for today

Mainly cloudy. There will be one or two rain patches at first. Sunny periods during the day with a maximum temperature of about 28 degrees. Moderate to fresh north to northeasterly winds.

Outlook : Fine and dry in the next few days. Temperature difference between day and night will be relatively large.


(The above forecast period is valid up to 23:59 HKT today, 18/10/2017; 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 17/Oct/2017

GALE WARNING AREA: TAIWAN STRAIT.

GENERAL SITUATION AT 170900 UTC:
THE NORTHEAST MONSOON IS GENERALLY AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 171300 UTC:

HONG KONG= NE 5-6, UP TO 7 AT FIRST. A FEW SHOWERS AT FIRST. SEA 2-3 M, UP TO 4 M AT FIRST. SWELL NE UP TO 2 M. TEMP 24-28 C. =
KWANGTUNG= NE 6-7. ISOL SHOWERS. SEA 3-4 M. SWELL NE 2 M. =
TAIWAN STRAIT= NE 7-8. ISOL SHOWERS. SEA 4-6 M. SWELL NE 2-3 M. =
BASHI= NE 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL NE 2-3 M. =
PRATAS= NE 6-7. ISOL SHOWERS. SEA 3-4 M. SWELL NE 2 M. =
BALINTANG= NE 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL NE 2-3 M. =
SCARBOROUGH= NE 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 2-3 M. =
PARACEL= NE 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 2 M. =
TONKIN= N TO NE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
DANANG= NE 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 2 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
  • Tidal Information

    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

    Current Weather | Local Weather Forecast | Regional Temperature Forecast in HK
    9-day Weather Forecast | UV Index Forecast | Weather Information for Fishermen

    Bulletin issued at 05:30 HKT 18/Oct/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 18 October 2017

    Warnings:
    Strong winds in all areas.

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

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North to northeast force 5 to 6.
    A few showers at first.
    Moderate to rough seas.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    Northeast force 6 to 7.
    Rough seas.

    Outlook for the next 48 hours
    North to northeasterly winds of force 5 to 6, occasionally force 7. Isolated showers and thunderstorms.

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

    Waglan Island Wind north force 4
      Visibility 12 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 30 Kilometres

    Dongsha Wind northeast force 5
      Visibility 10 Kilometres

    Macau Wind north-northeast force 4
      Visibility 9 Kilometres

    Xisha Wind east-northeast force 2
      Visibility 15 Kilometres

  • Explanation of Seas or Sea Waves
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  • Map showing forecast areas
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 18/OCT/2017
    (Next update at 9:00-9:30 HKT 18/OCT/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE NORTHEAST MONSOON IS AFFECTING THE SOUTH
     CHINA COASTAL WATERS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  010/10-15
       OFFSHORE:  030/15-20, 25 AT FIRST               24-29
   B.   2000 FT:  060/15-20                            20
   C.   5000 FT:  080/15-20                            17
   D.  10000 FT:  090/15                               11
   E.  18000 FT:  120/15                               MS3
   F.  24000 FT:  120/25                               MS12
   G.  30000 FT:  080/20                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      MAINLY CLOUDY WITH ONE OR TWO RAIN PATCHES AT
      FIRST. SUNNY PERIODS DURING THE DAY.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT  SCT 3500 FT.
   K. VISIBILITY    : 10 KM. TEMPO 4500M IN RAIN
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 10600 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 2.0-3.0 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTH TO NORTHEASTERLY WINDS, FRESH
     OFFSHORE. SUNNY PERIODS.=

    ===================================================================
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 18/Oct/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     27.6 C
Minimum Air Temperature                     24.7 C
Grass Minimum Temperature                   24.2 C
Relative Humidity                        80 - 98 Percent
Rainfall                                    41.3 mm 
Total rainfall since 1st January          2540.9 mm
Against an average of                     2306.7 mm

Other Stations                Min                  Max
King's Park                  24.5 C               27.8 C
Wong Chuk Hang               25.2 C               28.9 C
Ta Kwu Ling                  20.9 C               26.9 C
Lau Fau Shan                 21.1 C               28.6 C
Tai Po                       21.5 C               26.6 C
Sha Tin                      23.1 C               27.3 C
Tuen Mun                     21.4 C               27.4 C
Tseung Kwan O                23.3 C               27.6 C
Sai Kung                     23.4 C               27.6 C
Cheung Chau                  24.2 C               26.9 C
Chek Lap Kok                 22.6 C               29.1 C
Tsing Yi                     24.2 C               29.0 C
Shek Kong                    21.3 C               27.4 C
Tsuen Wan Ho Koon            23.3 C               27.3 C
Tsuen Wan Shing Mun Valley   23.7 C               28.6 C
Hong Kong Park               24.4 C               28.7 C
Shau Kei Wan                 23.9 C               26.9 C
Kowloon City                 24.0 C               27.6 C
Happy Valley                 24.8 C               28.5 C
Wong Tai Sin                 24.0 C               27.9 C
Stanley                      24.8 C               27.9 C
Kwun Tong                    23.9 C               27.5 C
Sham Shui Po                 23.4 C               28.0 C
Kai Tak Runway Park          24.9 C               27.9 C
Yuen Long Park               21.9 C               28.2 C
Tai Mei Tuk               23.0 C               28.1 C

Duration of sunshine (King's Park):              0.6 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 6.
Sea surface temperature (Waglan Island):        27.7 C 

Yesterday's (17 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 17 Oct
     2003copy right image | Important notices | Privacy policy Last revision date: <18 Oct 2017> 

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