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Bulletin issued at 10:02 HKT 21/Nov/2017

At 10 a.m. at the Hong Kong Observatory the air temperature was 19 degrees Celsius and the relative humidity 79 per cent.
During the past hour the mean UV Index recorded at King's Park was 1. The intensity of UV radiation was low.

The air temperatures at other places were:

King's Park 18 degrees;
Wong Chuk Hang 20 degrees;
Ta Kwu Ling 16 degrees;
Tai Po 17 degrees;
Sha Tin 17 degrees;
Tuen Mun 17 degrees;
Tseung Kwan O 18 degrees;
Sai Kung 17 degrees;
Cheung Chau 18 degrees;
Chek Lap Kok 17 degrees;
Tsing Yi 19 degrees;
Shek Kong 17 degrees;
Tsuen Wan Ho Koon 17 degrees;
Tsuen Wan Shing Mun Valley 18 degrees;
Hong Kong Park 19 degrees;
Shau Kei Wan 19 degrees;
Kowloon City 18 degrees;
Happy Valley 19 degrees;
Wong Tai Sin 18 degrees;
Stanley 19 degrees;
Kwun Tong 18 degrees;
Sham Shui Po 18 degrees;
Kai Tak Runway Park 19 degrees;
Yuen Long Park 17 degrees;
Tai Mei Tuk 18 degrees.


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


Climatological Information for 21 Nov

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 09:45 HKT 21/Nov/2017

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

The northeast monsoon is bringing cool weather to Guangdong. Locally, the minimum temperature recorded at the Observatory was 17.5 degrees this morning, the lowest so far this autumn.

Weather forecast for today

It will be cloudy. Bright periods in the afternoon. Moderate north to northeasterly winds.

Outlook : Cool in the morning and at night in the next few days.


(The above forecast period is valid up to 23:59 HKT today, 21/11/2017; 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/Nov/2017

N0 WARNING.

GENERAL SITUATION AT 202100 UTC:
THE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 210100 UTC:

HONG KONG= N TO NE 5-6. RAIN PATCHES. SEA 2-3 M. SWELL NE 2 M. TEMP 20-17 C. =
KWANGTUNG= NE 6-7. RAIN PATCHES. SEA 3-4 M. SWELL NE 2-3 M. =
TAIWAN STRAIT= NE 6-7. RAIN PATCHES. SEA 3-4 M. SWELL NE 3 M. =
BASHI= NE 5-6, 7 AT FIRST. RAIN PATCHES. SEA 2-3 M, 4 M AT FIRST. SWELL NE 2-3 M. =
PRATAS= NE 6-7. RAIN PATCHES. SEA 3-4 M. SWELL NE 2-3 M. =
BALINTANG= NE 5-6, 7 AT FIRST. RAIN PATCHES. SEA 2-3 M, 4 M AT FIRST. SWELL NE 2-3 M. =
SCARBOROUGH= NE 5-6. RAIN PATCHES. SEA 2-3 M. SWELL NE 2-3 M. =
PARACEL= NE 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL NE 2-3 M. =
TONKIN= NE 6-7. RAIN PATCHES. SEA 3-4 M. SWELL NE 2 M. =
DANANG= NE 6-7. ISOL SHOWERS AND TS. SEA 3-4 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 09:30 HKT 21/Nov/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 21 November 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 rain patches.
    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 6 to 7, occasionally force 8.

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

    Waglan Island Wind north-northeast force 4
      Visibility 20 Kilometres

    Shantou Wind north-northeast force 2
      Visibility 30 Kilometres

    Dongsha Wind northeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind northeast force 4

    Macau Wind north force 3
      Visibility 9 Kilometres

    Xisha Wind east-northeast force 2
      Visibility 12 Kilometres in showers

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
  • Descriptive Terms of Wind Speeds
  • Visibility Readings in Hong Kong Waters
  • 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 09:30 HKT 21/NOV/2017
    (Next update at 17:30 HKT 21/NOV/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 AREAS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  030/10
       OFFSHORE:  040/20-25                            15-20
   B.   2000 FT:  080/20                               13
   C.   5000 FT:  190/10                               16
   D.  10000 FT:  260/15                               7
   E.  18000 FT:  270/25                               MS4
   F.  24000 FT:  260/35                               MS15
   G.  30000 FT:  260/40                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      3300-4100 FT
   I. WEATHER       : 
      BRIGHT PERIODS IN THE AFTERNOON.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 2500 FT BKN 8000 FT
   K. VISIBILITY    : 8 KM.
   L. 0 DEG. C LEVEL: 15000 FT      10 DEG. C LEVEL(S) : 8600 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND  NEAR HILLS
   N. SEA STATE     : 2.5-4.0 M     SEA TEMPERATURE    : 24 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTH TO NORTHEASTERLY WINDS,
     OCNL STRONG OFFSHORE.  MAIN CLOUDY.=

    ===================================================================
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 10:00 HKT on 15 Nov 17

    VHHK SIGMET Z99 VALID 150200/150210 VHHH- VHHK HONG KONG FIR THIS IS A TEST SIGMET, PLEASE DISREGARD=

    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/Nov/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     20.3 C
Minimum Air Temperature                     17.9 C
Grass Minimum Temperature                   19.1 C
Relative Humidity                        73 - 86 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2571.8 mm
Against an average of                     2361.0 mm

Other Stations                Min                  Max
King's Park                  17.3 C               20.0 C
Wong Chuk Hang               18.8 C               21.1 C
Ta Kwu Ling                  15.0 C               17.8 C
Lau Fau Shan                 16.1 C               18.5 C
Tai Po                       15.9 C               19.5 C
Sha Tin                      16.7 C               20.1 C
Tuen Mun                     16.7 C               19.2 C
Tseung Kwan O                17.0 C               19.9 C
Sai Kung                     16.8 C               19.9 C
Cheung Chau                  16.9 C               19.9 C
Chek Lap Kok                 17.3 C               21.0 C
Tsing Yi                     18.0 C               20.5 C
Shek Kong                    15.8 C               18.6 C
Tsuen Wan Ho Koon            15.3 C               19.0 C
Tsuen Wan Shing Mun Valley   16.8 C               19.8 C
Hong Kong Park               18.5 C               20.6 C
Shau Kei Wan                 17.6 C               21.0 C
Kowloon City                 16.6 C               19.7 C
Happy Valley                 18.6 C               21.0 C
Wong Tai Sin                 16.6 C               19.9 C
Stanley                      18.5 C               20.7 C
Kwun Tong                    17.0 C               20.4 C
Sham Shui Po                 17.4 C               20.0 C
Kai Tak Runway Park          17.9 C               20.6 C
Yuen Long Park               15.9 C               18.7 C
Tai Mei Tuk               16.5 C               19.5 C

Duration of sunshine (King's Park):              0 H
The mean UV index recorded at King's Park yesterday was 1,
the UV intensity was Low.
The maximum UV index for yesterday was 4.
Sea surface temperature (Waglan Island):        23.1 C 

Yesterday's (20 Nov 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                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.11
Kwun Tong                           0.12
Sai Wan Ho                          0.10
King's Park                         0.15
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.14
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 20 Nov
     2003copy right image | Important notices | Privacy policy Last revision date: <21 Nov 2017> 

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