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Bulletin issued at 07:02 HKT 25/Nov/2017

At 7 a.m. at the Hong Kong Observatory the air temperature was 17 degrees Celsius and the relative humidity 75 per cent.

The air temperatures at other places were:

King's Park 17 degrees;
Wong Chuk Hang 17 degrees;
Ta Kwu Ling 15 degrees;
Lau Fau Shan 15 degrees;
Tai Po 15 degrees;
Sha Tin 17 degrees;
Tuen Mun 16 degrees;
Tseung Kwan O 16 degrees;
Sai Kung 16 degrees;
Cheung Chau 16 degrees;
Chek Lap Kok 17 degrees;
Tsing Yi 17 degrees;
Shek Kong 15 degrees;
Tsuen Wan Ho Koon 15 degrees;
Tsuen Wan Shing Mun Valley 16 degrees;
Hong Kong Park 17 degrees;
Shau Kei Wan 16 degrees;
Kowloon City 16 degrees;
Happy Valley 17 degrees;
Wong Tai Sin 16 degrees;
Stanley 17 degrees;
Kwun Tong 16 degrees;
Sham Shui Po 17 degrees;
Kai Tak Runway Park 17 degrees;
Yuen Long Park 15 degrees;
Tai Mei Tuk 16 degrees.


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


Climatological Information for 25 Nov

Regional Weather in Hong Kong

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Bulletin updated at 06:45 HKT 25/Nov/2017

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

The northeast monsoon is bringing cool weather to southern China. Meanwhile, a broad band of clouds is covering the region.

Weather forecast for today

Cloudy and cool with one or two rain patches. Temperatures will linger around 17 degrees during the day. Moderate north to northeasterly winds.

Outlook : Remaining cool tomorrow morning. Temperatures rising gradually early next week.


(The above forecast period is valid up to 23:59 HKT today, 25/11/2017; 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 21:00 HKT 24/Nov/2017

GALE WARNING AREAS: KWANGTUNG, TAIWAN STRAIT, BASHI, PRATAS, BALINTANG, PARACEL AND DANANG.

GENERAL SITUATION AT 240900 UTC:
AN INTENSE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 241300 UTC:

HONG KONG= N TO NE 6-7. RAIN PATCHES TOMORROW. SEA 3-4 M. SWELL N TO NE 2-3 M. TEMP 16-18 C. =
KWANGTUNG= NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL N TO NE 3-4 M. =
TAIWAN STRAIT= NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL N TO NE 3-5 M. =
BASHI= E TO NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL N TO NE 3-5 M. =
PRATAS= NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL N TO NE 3-4 M. =
BALINTANG= E TO NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL N TO NE 3-5 M. =
SCARBOROUGH= NE 6-7. RAIN PATCHES. SEA 3-4 M. SWELL N TO NE 3-4 M. =
PARACEL= NE 7-8. ISOL SHOWERS IN S. SEA 4-6 M. SWELL N TO NE 3 M. =
TONKIN= N TO NE 6-7. RAIN PATCHES. SEA 3-4 M. SWELL N TO NE 2 M. =
DANANG= N TO NE 7-8. ISOL SHOWERS IN S. SEA 4-6 M. SWELL N TO 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 25/Nov/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 25 November 2017

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

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

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North to northeast force 6, occasionally force 7.
    One or two rain patches.
    Rough seas.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    Northeast force 7 to 8.
    Rough to very rough seas.

    Outlook for the next 48 hours
    North to northeasterly winds of force 6 to 7, up to force 8 in east later.

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

    Waglan Island Wind northeast force 4
      Visibility 12 Kilometres

    Shantou Wind east-northeast force 1
      Visibility 3200 Metres in mist

    Dongsha Wind northeast force 5
      Visibility 10 Kilometres

    Huangmaozhou Wind east-northeast force 4

    Macau Wind north force 3
      Visibility 6 Kilometres

    Xisha Wind northeast force 4
      Visibility 16 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
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  • 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 01:30 HKT 25/NOV/2017
    (Next update at 9:00-9:30 HKT 25/NOV/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 AREA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  030/10
       OFFSHORE:  030/15-20                            14-18
   B.   2000 FT:  050/15-20                            13
   C.   5000 FT:  120/10                               14
   D.  10000 FT:  250/15                               8
   E.  18000 FT:  250/40                               MS4
   F.  24000 FT:  250/40                               MS16
   G.  30000 FT:  250/55                               MS30
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      3500 - 5000 FT
   I. WEATHER       : 
      CLOUDY WITH ONE OR TWO RAIN PATCHES
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT SCT 4000 FT.
   K. VISIBILITY    : 8 KM TEMPO 4000 M IN RAIN
   L. 0 DEG. C LEVEL: 14500 FT      10 DEG. C LEVEL(S) : 6800 FT
   M. TURBULENCE    : MOD OFFSHORE AND NEAR HILLS
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 23 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTH TO NORTHEASTERLY WINDS. CLOUDY
     WITH ONE OR TWO RAIN PATCHES AT FIRST.=

    ===================================================================
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 25/Nov/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     20.8 C
Minimum Air Temperature                     16.5 C
Grass Minimum Temperature                   16.6 C
Relative Humidity                        56 - 72 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2571.8 mm
Against an average of                     2365.2 mm

Other Stations                Min                  Max
King's Park                  15.9 C               20.6 C
Wong Chuk Hang               17.2 C               21.8 C
Ta Kwu Ling                  14.8 C               18.9 C
Lau Fau Shan                 15.4 C               19.5 C
Tai Po                       15.5 C               18.8 C
Sha Tin                      16.0 C               19.9 C
Tuen Mun                     16.0 C               19.5 C
Tseung Kwan O                15.7 C               21.0 C
Sai Kung                     15.7 C               18.9 C
Cheung Chau                  15.6 C               21.5 C
Chek Lap Kok                 16.5 C               19.9 C
Tsing Yi                     16.2 C               21.5 C
Shek Kong                    15.5 C               19.6 C
Tsuen Wan Ho Koon            14.4 C               18.7 C
Hong Kong Park               16.7 C               21.1 C
Shau Kei Wan                 16.1 C               21.1 C
Kowloon City                 15.5 C               20.7 C
Happy Valley                 17.0 C               21.5 C
Wong Tai Sin                 15.5 C               20.5 C
Stanley                      16.8 C               20.2 C
Kwun Tong                    15.5 C               20.4 C
Sham Shui Po                 16.4 C               22.0 C
Kai Tak Runway Park          16.8 C               21.7 C
Yuen Long Park               15.5 C               20.0 C
Tai Mei Tuk               15.2 C               20.9 C

Duration of sunshine (King's Park):              3.8 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):        22.2 C 

Yesterday's (24 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                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.10
King's Park                         0.15
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 24 Nov
     2003copy right image | Important notices | Privacy policy Last revision date: <25 Nov 2017> 

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