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Bulletin issued at 05:02 HKT 23/Oct/2017

At 5 a.m. at the Hong Kong Observatory the air temperature was 21 degrees Celsius and the relative humidity 66 per cent.

Please be reminded that:

The Fire Danger Warning is Red and the fire risk is extreme.

The air temperatures at other places were:

King's Park 21 degrees;
Wong Chuk Hang 22 degrees;
Ta Kwu Ling 15 degrees;
Lau Fau Shan 18 degrees;
Tai Po 18 degrees;
Sha Tin 21 degrees;
Tuen Mun 20 degrees;
Tseung Kwan O 18 degrees;
Sai Kung 21 degrees;
Cheung Chau 19 degrees;
Chek Lap Kok 21 degrees;
Tsing Yi 22 degrees;
Shek Kong 18 degrees;
Tsuen Wan Ho Koon 18 degrees;
Tsuen Wan Shing Mun Valley 20 degrees;
Hong Kong Park 20 degrees;
Shau Kei Wan 21 degrees;
Kowloon City 20 degrees;
Happy Valley 19 degrees;
Wong Tai Sin 21 degrees;
Stanley 22 degrees;
Kwun Tong 20 degrees;
Sham Shui Po 20 degrees;
Kai Tak Runway Park 22 degrees;
Yuen Long Park 20 degrees;
Tai Mei Tuk 19 degrees.


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


Climatological Information for 23 Oct

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 04:45 HKT 23/Oct/2017

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

A dry northeast monsoon continues to bring fine weather to southern China. Locally, temperatures over the territory generally fell to about 20 degrees this morning.

At 5 a.m., Typhoon Lan was centred about 40 kilometres west of Tokyo. It is forecast to move northeast at about 55 kilometres per hour across Honshu of Japan.

Weather forecast for today

It will be fine. Slightly cooler in the morning. Very dry during the day with a maximum temperature of around 27 degrees. Moderate north to northeasterly winds, fresh at times.

Outlook : Remaining fine and dry in the next few days.


(The above forecast period is valid up to 23:59 HKT today, 23/10/2017; 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 22/Oct/2017

N0 WARNING.

GENERAL SITUATION AT 220900 UTC:
THE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS. SEVERE TYPHOON LAN (1721) 935 HPA 31N 135E NNE 24 KT WKN.

MARINE FORECAST FOR 24 HOURS FROM 221300 UTC:

HONG KONG= N TO NE 4-5. FINE. SEA 2 M. SWELL NE 2 M. TEMP 20-27 C. =
KWANGTUNG= N TO NE 5-6, OCNL 7 IN E. FINE. SEA 2-3 M, UP TO 4 M IN E. SWELL NE 2-3 M. =
TAIWAN STRAIT= N TO NE 6-7. FINE. SEA 3-4 M. SWELL N TO NE 3-5 M. =
BASHI= NE 6-7. FINE. SEA 3-4 M. SWELL N TO NE 3-5 M. =
PRATAS= N TO NE 5-6, OCNL 7. FINE. SEA UP TO 4 M. SWELL NE 3-4 M. =
BALINTANG= NE 6-7. ISOL SHOWERS. SEA 3-4 M. SWELL N TO NE 3-5 M. =
SCARBOROUGH= N 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL N TO NE 3 M. =
PARACEL= N TO NE 5, OCNL 6. ISOL SHOWERS. SEA UP TO 3 M. SWELL NE 2-3 M. =
TONKIN= N TO NE 5, OCNL 6. FINE. SEA UP TO 3 M. SWELL NE 2 M. =
DANANG= N TO NE 5, OCNL 6. ISOL SHOWERS. SEA UP TO 3 M. SWELL NE 2-3 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.


  • 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 23/Oct/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 23 October 2017

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

    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 4 to 5.
    Moderate seas.

    Nan'ao:
    Northeast force 5 to 6, occasionally force 7.
    Moderate to rough seas.

    Shanwei:
    Northeast force 5 to 6.
    Moderate to rough seas.

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

    Outlook for the next 48 hours
    Northeasterly winds of force 5 to 6, occasionally force 7.

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

    Waglan Island Wind north force 4
      Visibility 14 Kilometres

    Shantou Wind northeast force 1
      Visibility 13 Kilometres

    Dongsha Wind north-northeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind northeast force 4

    Macau Wind north force 3
      Visibility 16 Kilometres

    Xisha Wind north-northeast force 2
      Visibility 12 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 23/OCT/2017
    (Next update at 9:00-9:30 HKT 23/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 SOUTH
     CHINA COASTAL AREAS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  020/10
       OFFSHORE:  020/10-15                            20-27
   B.   2000 FT:  040/15, OCNL 20                      19
   C.   5000 FT:  070/15                               14
   D.  10000 FT:  350/15, OCNL 20                      11
   E.  18000 FT:  320/15                               MS2
   F.  24000 FT:  250/10                               MS10
   G.  30000 FT:  270/10                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 4500 FT.
   K. VISIBILITY    : 10 KM
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD OFFSHORE AND NEAR HILLS
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTHEASTERLY WINDS, FRESH AT TIMES.
     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 23/Oct/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     26.3 C
Minimum Air Temperature                     20.2 C
Grass Minimum Temperature                   20.3 C
Relative Humidity                        51 - 70 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2540.9 mm
Against an average of                     2320.7 mm

Other Stations                Min                  Max
King's Park                  19.5 C               26.2 C
Wong Chuk Hang               20.6 C               27.4 C
Ta Kwu Ling                  17.0 C               26.3 C
Lau Fau Shan                 18.3 C               25.6 C
Tai Po                       18.0 C               25.8 C
Sha Tin                      19.7 C               26.6 C
Tuen Mun                     19.5 C               26.9 C
Tseung Kwan O                17.9 C               27.6 C
Sai Kung                     20.2 C               25.3 C
Cheung Chau                  19.1 C               27.5 C
Chek Lap Kok                 20.7 C               26.8 C
Tsing Yi                     18.6 C               26.9 C
Shek Kong                    18.8 C               26.7 C
Tsuen Wan Ho Koon            17.8 C               25.0 C
Tsuen Wan Shing Mun Valley   17.4 C               27.7 C
Hong Kong Park               20.0 C               26.8 C
Shau Kei Wan                 19.7 C               27.3 C
Kowloon City                 19.6 C               26.9 C
Happy Valley                 19.9 C               27.9 C
Wong Tai Sin                 19.6 C               27.9 C
Stanley                      21.0 C               27.0 C
Kwun Tong                    19.7 C               27.4 C
Sham Shui Po                 19.8 C               27.3 C
Kai Tak Runway Park          20.4 C               27.5 C
Yuen Long Park               19.8 C               27.9 C
Tai Mei Tuk               18.6 C               26.0 C

Duration of sunshine (King's Park):              10.4 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):        26.4 C 

Yesterday's (22 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 22 Oct
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