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Bulletin issued at 18:02 HKT 24/Oct/2017

At 6 p.m. at the Hong Kong Observatory the air temperature was 25 degrees Celsius and the relative humidity 63 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.1. The intensity of UV radiation was low.

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


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


Climatological Information for 24 Oct

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Automatic Regional Weather Forecast in Hong Kong & Pearl River Delta Region

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Bulletin updated at 17:45 HKT 24/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, the relative humidity over most parts of the territory stayed at 50 per cent or below in the afternoon.

Weather forecast for tonight and tomorrow

Fine and dry. The minimum temperature tomorrow morning will be about 22 degrees in the urban areas, and a couple of degrees lower in the New Territories. The maximum temperature will be around 27 degrees during the day. Moderate to fresh east to northeasterly winds.

Outlook : Fine and dry in the following few days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 25/10/2017; 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 24/Oct/2017

GALE WARNING AREA: TAIWAN STRAIT.

GENERAL SITUATION AT 232100 UTC:
THE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 240100 UTC:

HONG KONG= E TO NE 5-6. FINE. SEA 2-3 M. SWELL NE UP TO 2 M. TEMP 28-22 C. =
KWANGTUNG= NE 6-7. FINE. SEA 3-4 M. SWELL NE 2 M. =
TAIWAN STRAIT= NE 7-8. FINE. SEA 4-6 M. SWELL N TO NE 3 M. =
BASHI= NE 6-7. FINE. SEA 3-4 M. SWELL NE 2-3 M. =
PRATAS= NE 6-7. FINE. SEA 3-4 M. SWELL NE 2-3 M. =
BALINTANG= NE 6-7. FINE. SEA 3-4 M. SWELL NE 2-3 M. =
SCARBOROUGH= NE 5-6, OCNL 7. ISOL SHOWERS. SEA UP TO 4 M. SWELL NE 2-3 M. =
PARACEL= NE 5-6. ISOL SHOWERS. SEA 2-3 M. SWELL NE 2 M. =
TONKIN= NE 5-6. FINE. SEA 2-3 M. SWELL NE UP TO 2 M. =
DANANG= NE 5-6. ISOL SHOWERS. SEA 2-3 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 16:30 HKT 24/Oct/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 24 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:
    East to northeast force 5 to 6.
    Moderate to rough seas.

    Nan'ao:
    Northeast force 6 to 7.
    Rough seas.

    Shanwei and South of Hong Kong:
    Northeast force 5 to 6, occasionally force 7.
    Moderate to rough seas.

    Shangchuan Dao:
    Northeast force 5 to 6.
    Moderate to rough seas.

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

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

    Waglan Island Wind east force 3
      Visibility 11 Kilometres

    Shantou Wind northeast force 2
      Visibility 21 Kilometres

    Dongsha Wind northeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 5

    Macau Wind northeast force 1
      Visibility 11 Kilometres

    Xisha Wind east-northeast force 4
      Visibility 10 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 17:30 HKT 24/OCT/2017
    (Next update at 01:30 HKT 25/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 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  060/5-10
       OFFSHORE:  080/10-15, OCNL 20                   27-22
   B.   2000 FT:  080/10-15, OCNL 20                   19
   C.   5000 FT:  060/15                               13
   D.  10000 FT:  340/10                               9
   E.  18000 FT:  300/10                               MS1
   F.  24000 FT:  280/15                               MS11
   G.  30000 FT:  300/10                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 4000 FT.
   K. VISIBILITY    : 8 KM.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 8800 FT
   M. TURBULENCE    : MOD OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 1.5-2.5 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE EAST TO NORTHEASTERLY WINDS, OCCASIONALLY FRESH 
     OFFSHORE. 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 24/Oct/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     27.7 C
Minimum Air Temperature                     20.8 C
Grass Minimum Temperature                   19.8 C
Relative Humidity                        51 - 69 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2540.9 mm
Against an average of                     2322.3 mm

Other Stations                Min                  Max
King's Park                  20.3 C               27.3 C
Wong Chuk Hang               21.2 C               28.2 C
Ta Kwu Ling                  14.7 C               27.8 C
Lau Fau Shan                 17.7 C               27.1 C
Sha Tin                      18.9 C               27.4 C
Tuen Mun                     19.6 C               27.9 C
Tseung Kwan O                17.5 C               28.4 C
Sai Kung                     20.4 C               26.2 C
Cheung Chau                  18.9 C               27.5 C
Chek Lap Kok                 20.0 C               27.5 C
Tsing Yi                     21.0 C               28.3 C
Shek Kong                    17.2 C               27.7 C
Tsuen Wan Ho Koon            17.8 C               25.8 C
Tsuen Wan Shing Mun Valley   18.8 C               28.2 C
Hong Kong Park               19.8 C               26.7 C
Shau Kei Wan                 20.6 C               27.0 C
Kowloon City                 19.7 C               27.5 C
Happy Valley                 18.9 C               28.9 C
Wong Tai Sin                 20.3 C               28.5 C
Stanley                      21.5 C               27.3 C
Kwun Tong                    19.8 C               27.1 C
Sham Shui Po                 19.9 C               28.3 C
Kai Tak Runway Park          20.8 C               27.1 C
Yuen Long Park               19.8 C               28.8 C
Tai Mei Tuk               18.6 C               26.8 C

Duration of sunshine (King's Park):              7.4 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):        26.2 C 

Yesterday's (23 Oct 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 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                           0.08
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                        0.15

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 23 Oct
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