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Bulletin issued at 22:02 HKT 20/Apr/2017

At 10 p.m. at the Hong Kong Observatory the air temperature was 25 degrees Celsius and the relative humidity 91 per cent.

The air temperatures at other places were:

King's Park 25 degrees;
Wong Chuk Hang 25 degrees;
Ta Kwu Ling 24 degrees;
Lau Fau Shan 25 degrees;
Tai Po 24 degrees;
Sha Tin 25 degrees;
Tuen Mun 25 degrees;
Tseung Kwan O 24 degrees;
Sai Kung 25 degrees;
Cheung Chau 25 degrees;
Chek Lap Kok 27 degrees;
Tsing Yi 25 degrees;
Shek Kong 25 degrees;
Tsuen Wan Ho Koon 24 degrees;
Tsuen Wan Shing Mun Valley 25 degrees;
Hong Kong Park 25 degrees;
Shau Kei Wan 24 degrees;
Kowloon City 25 degrees;
Happy Valley 26 degrees;
Wong Tai Sin 26 degrees;
Stanley 25 degrees;
Kwun Tong 25 degrees;
Sham Shui Po 26 degrees;
Kai Tak Runway Park 25 degrees;
Yuen Long Park 25 degrees;
Tai Mei Tuk 24 degrees.


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


Climatological Information for 20 Apr

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


Local Weather Forecast
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Bulletin updated at 21:45 HKT 20/Apr/2017

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

A southerly airstream is bringing showers to Guangdong. Meanwhile, pressure is rising over central China, a cold front is expected to reach the coastal areas of Guangdong tomorrow night.

Weather forecast for tonight and tomorrow

Mainly cloudy. There will be a few showers and squally thunderstorms tomorrow. Showers will become more frequent during the day. The maximum temperature will be about 28 degrees. Moderate southerly winds, freshening from the north tomorrow night and temperatures will fall appreciably to around 21 degrees.

Outlook : Mainly cloudy and cooler in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 21/04/2017; 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 20/Apr/2017

N0 WARNING.

GENERAL SITUATION AT 200900 UTC:
A SOUTHERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 201300 UTC:

HONG KONG= S 4-5, N UP TO 6 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2 M, UP TO 3 M LATER. TEMP 21-28 C. =
KWANGTUNG= S TO SW 4-5, N 6 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2 M, 3 M LATER. =
TAIWAN STRAIT= SW 5-6, NE 6 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. =
BASHI= W TO SW 5-6. ISOL SHOWERS AND TS LATER. SEA 2-3 M. =
PRATAS= S TO SW 4-5. ISOL SHOWERS AND TS LATER. SEA UP TO 2 M. =
BALINTANG= W TO SW 4-5. FINE. SEA UP TO 2 M. =
SCARBOROUGH= S TO SW 4-5. FINE. SEA UP TO 2 M. =
PARACEL= S 4-5, OCNL 6 IN S. ISOL SHOWERS AND TS. SEA UP TO 3 M. =
TONKIN= S 5-6, N 6 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. =
DANANG= S 4-5, OCNL 6 IN S. ISOL SHOWERS AND TS. SEA UP TO 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 19:30 HKT 20/Apr/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 20 April 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    A southerly airstream is bringing unsettled weather to the coastal waters of Guangdong. Meanwhile, pressure is rising over central China, a cold front is expected to reach the coastal waters of Guangdong tomorrow night.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South force 4 to 5, becoming north up to force 6 later.
    Isolated squally showers and thunderstorms.
    Moderate seas, becoming rough later.

    Nan'ao:
    Southwest force 4 to 5, becoming north force 6 later.
    Isolated squally showers and thunderstorms.
    Moderate seas, becoming rough later.

    Shanwei and South of Hong Kong:
    South to southwest force 4 to 5, becoming north force 6 later.
    Isolated squally showers and thunderstorms.
    Moderate seas, becoming rough later.

    Shangchuan Dao:
    South force 4 to 5, becoming north force 6 later.
    Isolated squally showers and thunderstorms.
    Moderate seas, becoming rough later.

    Outlook for the next 48 hours
    North to northeasterly winds of force 5 to 6. Isolated squally showers and thunderstorms.

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

    Waglan Island Wind southeast force 3
      Visibility 13 Kilometres

    Shantou Wind south-southeast force 2
      Visibility 30 Kilometres

    Dongsha Wind west-southwest force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind east-southeast force 4

    Xisha Wind south-southwest force 3
      Visibility 18 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
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    • WEATHER FORECAST FOR LOCAL AVIATION
    Traditional Chinese Simplified Chinese

    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 20/APR/2017
    (Next update at 01:30 HKT 21/APR/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB ON HIGH GROUND.
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS LATER.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A SOUTHERLY AIRSTREAM IS BRINGING UNSETTLED
     WEATHER TO THE COASTAL AREAS OF GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  160/10
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  160/15                               27-25
   B.   2000 FT:  210/15-20, OCNL 25                   21
   C.   5000 FT:  230/20                               18
   D.  10000 FT:  240/25                               9
   E.  18000 FT:  250/40                               MS5
   F.  24000 FT:  250/45                               MS14
   G.  30000 FT:  260/50                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS.  A FEW
      SQUALLY THUNDERSTORMS LATER.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT  SCT 4000 FT.  TEMPO FEW CB 1000 FT
      SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 10 KM.  TEMPO 4000 M IN SHOWERS.
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 15500 FT      10 DEG. C LEVEL(S) : 9600 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS AND NEAR HILLS.
                      MOD OFFSHORE.
   N. SEA STATE     : 1.5-2.0 M     SEA TEMPERATURE    : 23 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTHERLY WINDS.  MAINLY CLOUDY WITH A
     FEW SHOWERS AND SQUALLY THUNDERSTORMS.  SHOWERS
     WILL BECOME MORE FREQUENT DURING THE DAY.=

    ===================================================================
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 15:05 HKT on 20 Apr 17

    VHHK SIGMET 2 VALID 200405/200805 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2042 E11130 - N2124 E11130 - N2230 E11342 - N2248 E11436 - N2042 E11436 - N2042 E11130 TOP FL390 MOV ENE 10KT NC= VHHK SIGMET 3 VALID 200705/201105 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2230 E11348 - N2330 E11700 - N2124 E11700 - N2124 E11348 - N2230 E11348 TOP FL390 MOV NE 10KT 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 20/Apr/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     29.4 C
Minimum Air Temperature                     24.7 C
Grass Minimum Temperature                   23.3 C
Relative Humidity                        63 - 88 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January            98.3 mm
Against an average of                      273.5 mm

Other Stations                Min                  Max
King's Park                  24.2 C               29.5 C
Wong Chuk Hang               23.2 C               28.1 C
Ta Kwu Ling                  22.1 C               32.6 C
Lau Fau Shan                 23.6 C               31.3 C
Sha Tin                      24.5 C               31.1 C
Tuen Mun                     23.4 C               30.8 C
Tseung Kwan O                23.8 C               32.3 C
Sai Kung                     23.3 C               32.0 C
Cheung Chau                  23.2 C               30.8 C
Chek Lap Kok                 24.6 C               31.4 C
Tsing Yi                     23.1 C               29.5 C
Shek Kong                    22.7 C               31.8 C
Tsuen Wan Ho Koon            22.1 C               29.9 C
Tsuen Wan Shing Mun Valley   23.1 C               30.5 C
Hong Kong Park               24.4 C               30.2 C
Shau Kei Wan                 23.9 C               31.1 C
Kowloon City                 23.9 C               30.5 C
Happy Valley                 24.5 C               30.0 C
Wong Tai Sin                 24.0 C               30.9 C
Stanley                      24.0 C               28.1 C
Kwun Tong                    24.6 C               30.8 C
Sham Shui Po                 24.4 C               29.8 C
Kai Tak Runway Park          24.6 C               30.7 C
Yuen Long Park               23.5 C               31.9 C
Tai Mei Tuk               24.2 C               31.4 C

Duration of sunshine (King's Park):              10.5 H
The mean UV index recorded at King's Park yesterday was 5,
the UV intensity was Moderate.
The maximum UV index for yesterday was 10.
Sea surface temperature (Waglan Island):        23.3 C 

Yesterday's (19 Apr 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 19 Apr
     2003copy right image | Important notices | Privacy policy Last revision date: <20 Apr 2017> 

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