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Bulletin issued at 00:02 HKT 04/May/2017

At midnight at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 86 per cent.

The air temperatures at other places were:

King's Park 26 degrees;
Wong Chuk Hang 26 degrees;
Ta Kwu Ling 26 degrees;
Lau Fau Shan 27 degrees;
Tai Po 27 degrees;
Sha Tin 27 degrees;
Tuen Mun 26 degrees;
Tseung Kwan O 26 degrees;
Sai Kung 26 degrees;
Cheung Chau 25 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 27 degrees;
Shek Kong 27 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 27 degrees;
Shau Kei Wan 26 degrees;
Kowloon City 26 degrees;
Happy Valley 27 degrees;
Wong Tai Sin 27 degrees;
Stanley 26 degrees;
Kwun Tong 26 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 27 degrees;
Yuen Long Park 26 degrees;
Tai Mei Tuk 26 degrees.


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


Climatological Information for 4 May

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


Local Weather Forecast
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Bulletin updated at 00:05 HKT 04/May/2017

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

A southerly airstream brought hot weather to the coast of Guangdong yesterday. Locally, it was hot with sunny periods apart from isolated showers. The maximum temperature recorded at the Observatory was 31.3 degrees in the afternoon, the highest so far this year. Besides, a trough of low pressure formed over central China yesterday, and moved southwards gradually. The trough of low pressure is expected to bring showers and thunderstorms to southern China in the next couple of days.

Weather forecast for Hong Kong (Thursday, 4 May 2017)

Mainly cloudy with one or two showers. Coastal mist in the morning. Sunny intervals at first. There will be more showers and a few thunderstorms later. Temperatures will range between 24 and 30 degrees. Moderate southerly winds.

Outlook : A few showers and thunderstorms in the following couple of days. Sunny intervals early next week.


(The above forecast period is valid up to 23:59 HKT tomorrow, 05/05/2017; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

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MARINE FORECAST
Traditional Chinese Simplified Chinese

Marine Forecast

Weather Information for the Marine Community

Bulletin issued at 21:00 HKT 03/May/2017

N0 WARNING.

GENERAL SITUATION AT 030900 UTC:
TROUGH 25N 107E 28N 113E 30N 116E SE 5KT.

MARINE FORECAST FOR 24 HOURS FROM 031300 UTC:

HONG KONG= S 4, OCNL 5. ISOL SHOWERS AND TS. SEA UP TO 2 M. TEMP 24-30 C. =
KWANGTUNG= S TO SE 4, OCNL 5. ISOL SHOWERS AND TS LATER. SEA UP TO 2 M. =
TAIWAN STRAIT= E TO NE 4, SW 4 LATER. ISOL SHOWERS. =
BASHI= E TO SE 4. ISOL SHOWERS. =
PRATAS= S TO SE 4. ISOL SHOWERS. =
BALINTANG= E TO SE 4. ISOL SHOWERS. =
SCARBOROUGH= E TO SE 4. ISOL SHOWERS. =
PARACEL= S TO SE 4, OCNL 5. ISOL SHOWERS. SEA UP TO 2 M. =
TONKIN= S TO SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= S TO SE 4-5. ISOL SHOWERS. SEA UP TO 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 00:30 HKT 04/May/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 a.m. on 04 May 2017

    Weather Situation:
    A southerly airstream is affecting the south China coastal waters. Meanwhile, a trough of low pressure over central China is moving southwards gradually. It is expected to reach the south China coastal waters later.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South force 4, occasionally force 5.
    Isolated showers and thunderstorms. Mist patches at first.
    Moderate seas.

    Nan'ao and Shanwei:
    South to southeast force 4.
    Moderate seas.

    South of Hong Kong:
    South to southeast force 4, occasionally force 5.
    Moderate seas.

    Shangchuan Dao:
    South to southeast force 4 to 5.
    Isolated showers and thunderstorms later.
    Moderate seas.

    Outlook for the next 48 hours
    South to southeasterly winds of force 4 to 5. Isolated showers and thunderstorms.

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

    Waglan Island Wind east-southeast force 2
      Visibility 5000 Metres

    Shantou Wind east-southeast force 1
      Visibility 10 Kilometres

    Dongsha Wind southeast force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind southeast force 4

    Macau Wind south-southeast force 2
      Visibility 8 Kilometres

    Xisha Wind south-southeast force 2
      Visibility 30 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
    Traditional Chinese Simplified Chinese

    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 03/MAY/2017
    (Next update at 01:30 HKT 04/MAY/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A SOUTHERLY AIRSTREAM 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:  160/10                               28-24
   B.   2000 FT:  180/15-20                            22
   C.   5000 FT:  210/20                               18
   D.  10000 FT:  260/20                               10
   E.  18000 FT:  270/20                               MS2
   F.  24000 FT:  280/25                               MS15
   G.  30000 FT:  300/35                               MS29
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 FT.
   K. VISIBILITY    : 9 KM.  TEMPO 4000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 10000 FT
   M. TURBULENCE    : MOD NEAR HILLS.
   N. SEA STATE     : 1.5 M         SEA TEMPERATURE    : 24 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTHERLY WINDS.  MAINLY CLOUDY WITH
     SHOWERS AND ISOLATED THUNDERSTORMS.  LOCALIZED
     MIST.=

    ===================================================================
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 16:45 HKT on 27 Apr 17

    VHHK SIGMET 2 VALID 270445/270845 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1936 E11618 - N1936 E11154 - N2200 E11600 - N2200 E11730 - N2100 E11730 TOP FL380 MOV E 10KT NC= VHHK SIGMET 4 VALID 270845/271245 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2000 E11642 - N1836 E11536 - N1836 E11218 - N2000 E11254 - N2000 E11642 TOP FL380 MOV E 10KT WKN=

    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 04/May/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.3 C
Minimum Air Temperature                     25.6 C
Grass Minimum Temperature                   25.0 C
Relative Humidity                        66 - 89 Percent
Rainfall                                      Trace 
Total rainfall since 1st January           134.5 mm
Against an average of                      368.7 mm

Other Stations                Min                  Max
King's Park                  25.3 C               31.2 C
Wong Chuk Hang               25.0 C               28.1 C
Ta Kwu Ling                  25.2 C               31.6 C
Lau Fau Shan                 25.2 C               30.8 C
Tai Po                       25.1 C               30.1 C
Sha Tin                      25.7 C               30.4 C
Tuen Mun                     25.5 C               29.7 C
Tseung Kwan O                24.7 C               30.1 C
Sai Kung                     24.9 C               27.6 C
Cheung Chau                  24.0 C               28.2 C
Chek Lap Kok                 26.0 C               30.1 C
Tsing Yi                     25.8 C               30.7 C
Shek Kong                    25.3 C               31.0 C
Tsuen Wan Ho Koon            24.4 C               28.7 C
Tsuen Wan Shing Mun Valley   25.2 C               30.0 C
Hong Kong Park               25.7 C               28.5 C
Shau Kei Wan                 24.1 C               29.5 C
Kowloon City                 25.2 C               30.6 C
Happy Valley                 26.2 C               30.4 C
Wong Tai Sin                 25.5 C               30.2 C
Stanley                      24.9 C               29.4 C
Kwun Tong                    25.4 C               30.0 C
Sham Shui Po                 26.0 C               31.2 C
Kai Tak Runway Park          25.1 C               28.7 C
Yuen Long Park               25.5 C               31.0 C
Tai Mei Tuk               24.9 C               29.9 C

Duration of sunshine (King's Park):              3.9 H
The mean UV index recorded at King's Park yesterday was 4,
the UV intensity was Moderate.
The maximum UV index for yesterday was 9.
 

Yesterday's (03 May 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                             0.08
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 03 May
     2003copy right image | Important notices | Privacy policy Last revision date: <04 May 2017> 

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