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Bulletin issued at 09:02 HKT 21/Oct/2017

At 9 a.m. at the Hong Kong Observatory the air temperature was 23 degrees Celsius and the relative humidity 69 per cent.
During the past hour the mean UV Index recorded at King's Park was 2. The intensity of UV radiation was low.

Please be reminded that:

The Fire Danger Warning is Yellow and the fire risk is high.

The air temperatures at other places were:

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

Between midnight and 9 a.m. the minimum temperature was 21.7 degrees Celsius at the Hong Kong Observatory.


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


Climatological Information for 21 Oct

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 08:45 HKT 21/Oct/2017

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

The northeast monsoon is bringing generally fine weather to the coast of Guangdong and the northern part of the South China Sea.

At 8 a.m., Super Typhoon Lan was centred about 640 kilometres south-southeast of Okinawa. It is forecast to move north-northeast at about 16 kilometres per hour across the seas east of the Ryukyu Islands.

Weather forecast for today

Fine and dry. The maximum temperature will be about 28 degrees. Moderate to fresh northerly winds.

Outlook : Remaining fine and dry in the next few days. Slightly cooler in the morning and at night.


(The above forecast period is valid up to 23:59 HKT today, 21/10/2017; 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 21/Oct/2017

GALE WARNING AREAS: TAIWAN STRAIT AND BASHI.

GENERAL SITUATION AT 202100 UTC:
AN INTENSE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS. SUPER TYPHOON LAN (1721) 930 HPA 21N 131E NNE 10 KT INTST NC.

MARINE FORECAST FOR 24 HOURS FROM 210100 UTC:

HONG KONG= N 4-5, OCNL 6. FINE. SEA UP TO 3 M. SWELL NE 2 M. TEMP 28-21 C. =
KWANGTUNG= N TO NE 5-6, OCNL 7 IN E. CLD. SEA 2-3 M, UP TO 4 M IN E. SWELL NE 2-3 M. =
TAIWAN STRAIT= N TO NE 7-8. CLD. SEA 4-6 M. SWELL N TO NE 3-5 M. =
BASHI= N 6-7, OCNL 8. ISOL SHOWERS AND TS. SEA UP TO 6 M. SWELL N TO NE 3-5 M. =
PRATAS= N TO NE 6-7. CLD. SEA 3-4 M. SWELL N TO NE 3-4 M. =
BALINTANG= N 6-7. ISOL SHOWERS AND TS. 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 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 09:30 HKT 21/Oct/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 21 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 force 4 to 5, occasionally force 6.
    Moderate to rough seas.

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

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

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

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

    Waglan Island Wind north force 5
      Visibility 22 Kilometres

    Shantou Wind southeast force 2
      Visibility 30 Kilometres

    Dongsha Wind north-northeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind north force 4

    Macau Wind north force 3
      Visibility 22 Kilometres

    Xisha Wind northeast force 2
      Visibility 20 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
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  • Visibility Readings in Hong Kong Waters
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 09:30 HKT 21/OCT/2017
    (Next update at 17:30 HKT 21/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 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  010/10
       OFFSHORE:  010/15-20                            23-29
   B.   2000 FT:  010/15-20                            18
   C.   5000 FT:  010/10                               14
   D.  10000 FT:  350/10                               12
   E.  18000 FT:  300/15                               MS3
   F.  24000 FT:  300/25                               MS13
   G.  30000 FT:  350/20                               MS30
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      3300-3700 FT
   I. WEATHER       : 
      FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3500 FT
   K. VISIBILITY    : 10 KM
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11200 FT
   M. TURBULENCE    : MOD OFFSHORE AND  NEAR HILLS
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTHERLY WINDS, OCCASIONALLY FRESH.
     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 21/Oct/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     27.8 C
Minimum Air Temperature                     22.3 C
Grass Minimum Temperature                   22.2 C
Relative Humidity                        64 - 75 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2540.9 mm
Against an average of                     2315.6 mm

Other Stations                Min                  Max
King's Park                  21.7 C               27.8 C
Wong Chuk Hang               22.7 C               29.3 C
Ta Kwu Ling                  21.4 C               27.8 C
Lau Fau Shan                 21.6 C               26.7 C
Tai Po                       21.4 C               27.3 C
Sha Tin                      22.4 C               28.0 C
Tuen Mun                     22.1 C               28.3 C
Tseung Kwan O                21.0 C               28.9 C
Sai Kung                     22.2 C               26.4 C
Cheung Chau                  21.1 C               28.6 C
Chek Lap Kok                 22.9 C               29.0 C
Tsing Yi                     22.3 C               28.9 C
Shek Kong                    21.7 C               28.4 C
Tsuen Wan Ho Koon            20.1 C               26.7 C
Tsuen Wan Shing Mun Valley   20.4 C               29.8 C
Hong Kong Park               22.5 C               28.5 C
Shau Kei Wan                 21.7 C               29.7 C
Kowloon City                 21.4 C               28.4 C
Happy Valley                 22.6 C               30.1 C
Wong Tai Sin                 21.8 C               28.6 C
Stanley                      22.2 C               29.1 C
Kwun Tong                    21.3 C               29.5 C
Sham Shui Po                 22.0 C               28.9 C
Kai Tak Runway Park          22.2 C               28.8 C
Yuen Long Park               22.5 C               29.5 C
Tai Mei Tuk               21.1 C               28.5 C

Duration of sunshine (King's Park):              4.6 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 8.
Sea surface temperature (Waglan Island):        26.8 C 

Yesterday's (20 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 20 Oct
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