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Bulletin issued at 21:02 HKT 30/Aug/2017

At 9 p.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 80 per cent.

Please be reminded that:

The Very Hot Weather Warning is now in force. Very hot weather might cause adverse health effects. Members of the public should take care to avoid heatstroke.

The air temperatures at other places were:

King's Park 27 degrees;
Wong Chuk Hang 25 degrees;
Ta Kwu Ling 28 degrees;
Lau Fau Shan 29 degrees;
Tai Po 29 degrees;
Sha Tin 29 degrees;
Tuen Mun 29 degrees;
Tseung Kwan O 25 degrees;
Sai Kung 26 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 30 degrees;
Tsing Yi 27 degrees;
Shek Kong 29 degrees;
Tsuen Wan Ho Koon 26 degrees;
Tsuen Wan Shing Mun Valley 26 degrees;
Hong Kong Park 27 degrees;
Shau Kei Wan 25 degrees;
Kowloon City 27 degrees;
Happy Valley 27 degrees;
Wong Tai Sin 27 degrees;
Stanley 25 degrees;
Kwun Tong 26 degrees;
Sham Shui Po 29 degrees;
Kai Tak Runway Park 26 degrees;
Yuen Long Park 29 degrees;
Tai Mei Tuk 27 degrees.

Between 7:45 and 8:45 p.m., lightning was detected within New Territories East, Hong Kong and Kowloon. The rainfall recorded in various regions were:

Southern District 0 to 9 mm;
Eastern District 1 to 5 mm;
Wan Chai 0 to 2 mm;
Central & Western District 0 to 1 mm;
Kwun Tong 0 to 1 mm.


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


Climatological Information for 30 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Automatic Regional Weather Forecast in Hong Kong & Pearl River Delta Region

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Bulletin updated at 21:15 HKT 30/Aug/2017

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

The subtropical ridge is covering southeastern China. Convective activities triggered by high temperatures brought more than 10 millimetres of rainfall to Sai Kung, Tseung Kwan O and the eastern part of Hong Kong Island in the evening. Meanwhile, the broad area of low pressure near Luzon is bringing unsettled weather to the region.

Weather forecast for tonight and tomorrow

Mainly cloudy. The minimum temperature will be about 27 degrees. There will be sunny periods and haze tomorrow. Very hot during the day with a maximum temperature of around 33 degrees. A few showers and isolated thunderstorms later. Light to moderate northeasterly winds.

Outlook : Showers will increase gradually in the latter part of this week.


(The above forecast period is valid up to 23:59 HKT tomorrow, 31/08/2017; 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 30/Aug/2017

N0 WARNING.

GENERAL SITUATION AT 300900 UTC:
LOW 1004 HPA 18N 122E W 10KT INTST NC.

MARINE FORECAST FOR 24 HOURS FROM 301300 UTC:

HONG KONG= NE 4-5. DOWN TO 4000 M IN SOME HAZE. DOWN TO 2000 M IN ISOL HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 2 M. TEMP 28-33 C. =
KWANGTUNG= N TO NE 5-6, UP TO 7 IN E LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 4 M LATER. SWELL NE UP TO 2 M. =
TAIWAN STRAIT= NE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
BASHI= NE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
PRATAS= N TO NE 5-6, UP TO 7 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 4 M LATER. SWELL NE UP TO 2 M. =
BALINTANG= NE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
SCARBOROUGH= N 6, SW 6-7 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE UP TO 2 M. =
PARACEL= N TO NE 4-5, UP TO 6 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2 M, UP TO 3 M LATER. =
TONKIN= N TO NE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= N TO NE 4-5. ISOL SHOWERS AND TS. 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.


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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    9-day Weather Forecast | UV Index Forecast | Weather Information for Fishermen

    Bulletin issued at 19:30 HKT 30/Aug/2017

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

    Warnings:
    Strong winds in Nan'ao, Shanwei and south of Hong Kong.

    Weather Situation:
    A northerly airstream is affecting the coastal waters of Guangdong. Meanwhile, the broad area of low pressure near Luzon is bringing unsettled weather to the region.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Northeast force 4 to 5.
    Some haze. Isolated heavy squally showers and thunderstorms.
    Moderate seas.

    Nan'ao and Shanwei:
    North to northeast force 5 to 6, becoming force 7 later.
    Isolated squally showers and thunderstorms.
    Moderate to rough seas.

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

    Shangchuan Dao:
    North to northeast force 4 to 5.
    Isolated squally showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    Northeasterly winds of force 6 to 7, becoming force 8 in east. Scattered heavy squally showers and thunderstorms.

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

    Waglan Island Wind southwest force 1
      Visibility 44 Kilometres

    Shantou Wind east force 2
      Visibility 30 Kilometres

    Dongsha Wind north force 4
      Visibility 10 Kilometres

    Macau Wind south force 2
      Visibility 8 Kilometres

    Xisha Wind north force 2
      Visibility 30 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 30/AUG/2017
    (Next update at 01:30 HKT 31/AUG/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     UNDER THE INFLUENCE OF THE SUBTROPICAL RIDGE,
     THE WEATHER IS GENERALLY FINE OVER SOUTHEASTERN
     CHINA.  MEANWHILE, THE BROAD AREA OF LOW
     PRESSURE NEAR LUZON IS BRINGING UNSETTLED
     WEATHER TO THE REGION.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  030/5-10
                  TEMPO VRB/15G25 IN TS                32-28
   B.   2000 FT:  030/10                               25
   C.   5000 FT:  030/15                               21
   D.  10000 FT:  050/20                               12
   E.  18000 FT:  070/20                               MS2
   F.  24000 FT:  070/15                               MS12
   G.  30000 FT:  030/10                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH HAZE AND A FEW SHOWERS.
      ISOLATED THUNDERSTORMS AT FIRST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT  SCT 4000 FT.  TEMPO FEW CB 1000 FT
      SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 8 KM.  TEMPO 4000 M IN HAZE/SHOWERS.
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11000 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS.
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT TO MODERATE NORTHEASTERLY WINDS.  MAINLY
     CLOUDY WITH HAZE AND A FEW SHOWERS.=

    ===================================================================
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 11:20 HKT on 29 Aug 17

    VHHK SIGMET 1 VALID 290320/290720 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1948 E11130 - N2124 E11130 - N2154 E11230 - N2012 E11230 - N1948 E11130 TOP FL420 MOV NNW 10KT NC= VHHK SIGMET 7 VALID 282320/290320 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1812 E11236 - N1930 E11130 - N2106 E11130 - N2130 E11236 - N1900 E11354 - N1812 E11236 TOP FL420 MOV NNW 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 30/Aug/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.4 C
Minimum Air Temperature                     24.6 C
Grass Minimum Temperature                   24.2 C
Relative Humidity                        66 - 95 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2244.4 mm
Against an average of                     1887.3 mm

Other Stations                Min                  Max
King's Park                  24.3 C               31.8 C
Wong Chuk Hang               23.5 C               31.1 C
Ta Kwu Ling                  22.9 C               34.0 C
Lau Fau Shan                 23.8 C               31.8 C
Tai Po                       23.7 C               32.6 C
Sha Tin                      23.6 C               33.0 C
Tuen Mun                     24.1 C               32.9 C
Tseung Kwan O                23.1 C               33.1 C
Sai Kung                     23.6 C               31.7 C
Cheung Chau                  23.7 C               31.6 C
Chek Lap Kok                 24.9 C               33.1 C
Tsing Yi                     24.0 C               31.9 C
Shek Kong                    23.4 C               33.8 C
Tsuen Wan Ho Koon            23.2 C               30.2 C
Tsuen Wan Shing Mun Valley   23.4 C               32.9 C
Hong Kong Park               23.6 C               32.8 C
Shau Kei Wan                 24.1 C               32.8 C
Kowloon City                 24.2 C               33.1 C
Happy Valley                 23.4 C               33.3 C
Wong Tai Sin                 23.3 C               32.3 C
Stanley                      23.8 C               31.0 C
Kwun Tong                    24.2 C               32.6 C
Sham Shui Po                 24.8 C               32.4 C
Kai Tak Runway Park          24.3 C               32.5 C
Yuen Long Park               23.9 C               34.1 C

Duration of sunshine (King's Park):              11.1 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 11.
Sea surface temperature (Waglan Island):        27.0 C 

Yesterday's (29 Aug 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.07 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                           0.07
Tap Mun                             0.08
Kat O                               0.08
Yuen Ng Fan                         0.11
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.11
Sai Wan Ho                          0.09
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.12
Chek Lap Kok                        0.13

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 29 Aug
     2003copy right image | Important notices | Privacy policy Last revision date: <30 Aug 2017> 

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