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Bulletin issued at 12:31 HKT 28/Aug/2017

At noon at the Hong Kong Observatory the air temperature was 25 degrees Celsius and the relative humidity 96 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.5. The intensity of UV radiation was low.

Under the influence of an active southerly airstream, areas of thundery showers continue to develop in the vicinity of Hong Kong. Showers will be rather heavy over parts of the territory. Members of the public should be on the alert.

Gusts reaching 70 kilometres per hour or above may affect Hong Kong.

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 3:30 p.m. today. A few squally thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 25 degrees;
Wong Chuk Hang 25 degrees;
Ta Kwu Ling 25 degrees;
Lau Fau Shan 25 degrees;
Tai Po 25 degrees;
Sha Tin 25 degrees;
Tuen Mun 25 degrees;
Tseung Kwan O 25 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 25 degrees;
Kowloon City 25 degrees;
Happy Valley 25 degrees;
Wong Tai Sin 25 degrees;
Stanley 25 degrees;
Kwun Tong 25 degrees;
Sham Shui Po 25 degrees;
Kai Tak Runway Park 25 degrees;
Yuen Long Park 26 degrees.

Between 10:45 and 11:45 a.m., the rainfall recorded in various regions were:

Tai Po 1 to 9 mm;
Yuen Long 2 to 4 mm;
Islands District 0 to 3 mm;
Tuen Mun 2 to 3 mm;
North District 2 to 3 mm;
Sai Kung 0 to 2 mm;
Tsuen Wan 1 to 2 mm;
Wong Tai Sin 1 mm;
Sham Shui Po 1 mm;
Eastern District 0 to 1 mm;
Kwai Tsing 1 mm;
Sha Tin 0 to 1 mm;
Yau Tsim Mong 0 to 1 mm;
Southern District 0 to 1 mm;
Kowloon City 0 to 1 mm;
Central & Western District 0 to 1 mm;
Kwun Tong 0 to 1 mm.

94.5 millimetres of rainfall were recorded at the Hong Kong Observatory between midnight last night and midday today.


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


Climatological Information for 28 Aug

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 11:45 HKT 28/Aug/2017

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

An active southerly airstream is bringing showers and thunderstorms to the coast of Guangdong.

Weather forecast for this afternoon and tonight

Cloudy with showers and a few squally thunderstorms. Showers will be heavy at times. Moderate to fresh south to southeasterly winds.

Outlook : Hot with sunny periods in the next couple of days.


(The above forecast period is valid up to 23:59 HKT today, 28/08/2017; 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 09:00 HKT 28/Aug/2017

N0 WARNING.

GENERAL SITUATION AT 272100 UTC:
A SOUTHERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 280100 UTC:

HONG KONG= S TO SE 4-5, OCNL 6 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M, UP TO 3 M AT FIRST. SWELL S TO SE 2 M. TEMP 28-27 C. =
KWANGTUNG= S TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S TO SE 3 M. =
TAIWAN STRAIT= NE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SE 2 M. =
BASHI= E TO NE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SE 2 M. =
PRATAS= E TO SE 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S TO SE 3 M. =
BALINTANG= E TO NE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SE 2 M. =
SCARBOROUGH= E TO NE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SE 3 M. =
PARACEL= S TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS IN N. SEA 2-3 M. SWELL S TO SE UP TO 3 M. =
TONKIN= S 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S UP TO 2 M. =
DANANG= S 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS IN N. SEA UP TO 2 M. SWELL S 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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    Bulletin issued at 12:30 HKT 28/Aug/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 p.m. on 28 August 2017

    Warnings:
    Strong winds in south of Hong Kong and Shangchuan Dao.

    Weather Situation:
    A southerly airstream is affecting the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South to southeast force 4 to 5.
    Scattered squally showers and thunderstorms.
    Moderate seas.

    Nan'ao:
    Southeast force 4 to 5, becoming northeast force 5 later.
    Isolated showers and thunderstorms.
    Moderate seas.

    Shanwei:
    South to southeast force 4 to 5, becoming northeast force 5 later.
    Isolated showers and thunderstorms.
    Moderate seas.

    South of Hong Kong and Shangchuan Dao:
    South to southeast force 5 to 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    East to southeasterly winds of force 4 to 5, northeasterly winds of force 5 in east. Isolated showers and thunderstorms.

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

    Waglan Island Wind variable force 1
      Visibility 2800 Metres

    Shantou Wind southeast force 2
      Visibility 30 Kilometres

    Dongsha Wind southeast force 2
      Visibility 9 Kilometres

    Xisha Wind south force 3
      Visibility 17 Kilometres

  • Explanation of Seas or Sea Waves
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 09:00 HKT 28/AUG/2017
    (Next update at 17:30 HKT 28/AUG/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN ACTIVE SOUTHERLY AIRSTREAM IS BRINGING
     SQUALLY SHOWERS TO THE COAST OF GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  160/10-15
                  TEMPO VRB/25G35 IN TS
       OFFSHORE:  160/15-20, OCNL 25                   25-29
   B.   2000 FT:  160/20-25, OCNL 30 AT FIRST          23
   C.   5000 FT:  170/25                               19
   D.  10000 FT:  170/25                               11
   E.  18000 FT:  150/25                               MS2
   F.  24000 FT:  120/20                               MS12
   G.  30000 FT:  100/20                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      1600 - 1800 FT.
   I. WEATHER       : 
      CLOUDY WITH SQUALLY SHOWERS AND A FEW
      THUNDERSTORMS.  SHOWERS WILL BE HEAVY AT FIRST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 2500 FT  BKN 8000 FT.  TEMPO
      FEW CB 800 FT  SCT 1500 FT  BKN 4000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 3000 M IN SHOWERS.
                      TEMPO 1500 M IN TS.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 10600 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS, OFFSHORE
                      AND NEAR HILLS.
   N. SEA STATE     : 2.5-3.5 M     SEA TEMPERATURE    : 26 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTH TO SOUTHEASTERLY WINDS, FRESH AT
     TIMES.  MAINLY CLOUDY WITH 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 12:40 HKT on 28 Aug 17

    VHHK SIGMET 1 VALID 280050/280450 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1800 E11248 - N1930 E11130 - N2124 E11130 - N2230 E11342 - N2242 E11418 - N1854 E11412 - N1800 E11248 TOP FL450 MOV NNW 15KT NC= VHHK SIGMET 2 VALID 280450/280850 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1830 E11224 - N1930 E11130 - N2124 E11130 - N2230 E11342 - N2248 E11442 - N1830 E11442 - N1830 E11224 TOP FL450 MOV NNW 15KT 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

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    Bulletin issued at 00:30 HKT 28/Aug/2017


    Tropical Cyclone Warning

    Tropical Depression Pakhar (1714) has weakened into an area of low pressure with central pressure 1002 hectopascals. At 271500 UTC, it was centred within 90 nautical miles of two three point six degrees north (23.6 N) one zero nine point four degrees east (109.4 E).

    Maximum winds near the centre are estimated to be 20 knots.

    No further warnings on this area of low pressure will be issued by the Hong Kong Observatory unless re-intensification takes place.



    The Hong Kong Observatory's tropical cyclone warnings for shipping are issued about one and a half hours after the time of observation. They incorporate additional information derived from surface and upper-air data and may therefore be slightly different from the real-time satellite or radar-based positions given in the hourly bulletins for public.

    While the forecast positions and track indicate the most likely future path of the tropical cyclone, they may deviate from the actual path taken by the storm.

    Tropical Cyclone Track
    YESTERDAY'S WEATHER AND RADIATION LEVEL Skip to main content
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    Yesterday's Weather and Radiation Level

    Bulletin issued at 11:15 HKT 28/Aug/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     26.9 C
Minimum Air Temperature                     24.0 C
Grass Minimum Temperature                   23.6 C
Relative Humidity                        86 - 98 Percent
Rainfall                                   157.7 mm 
Total rainfall since 1st January          2138.5 mm
Against an average of                     1869.6 mm

Other Stations                Min                  Max
King's Park                  23.7 C               27.6 C
Wong Chuk Hang               24.8 C               27.7 C
Ta Kwu Ling                  24.1 C               27.1 C
Lau Fau Shan                 23.7 C               25.8 C
Tai Po                       24.7 C               26.8 C
Sha Tin                      25.0 C               27.5 C
Tuen Mun                     24.4 C               27.4 C
Tseung Kwan O                24.1 C               26.6 C
Sai Kung                     24.8 C               27.7 C
Cheung Chau                  23.6 C               26.0 C
Chek Lap Kok                 24.9 C               28.9 C
Tsing Yi                     24.6 C               27.4 C
Shek Kong                    24.4 C               28.3 C
Tsuen Wan Ho Koon            23.6 C               26.2 C
Tsuen Wan Shing Mun Valley   24.1 C               26.4 C
Hong Kong Park               24.0 C               27.2 C
Shau Kei Wan                 23.3 C               27.3 C
Kowloon City                 24.1 C               27.1 C
Happy Valley                 24.8 C               27.7 C
Wong Tai Sin                 23.5 C               27.0 C
Stanley                      24.3 C               27.5 C
Kwun Tong                    24.0 C               27.0 C
Sham Shui Po                 24.6 C               27.1 C
Kai Tak Runway Park          23.7 C               28.2 C
Yuen Long Park               24.9 C               28.1 C

Duration of sunshine (King's Park):              0 H
The mean UV index recorded at King's Park yesterday was 0.4,
the UV intensity was Low.
The maximum UV index for yesterday was 1.
Sea surface temperature (Waglan Island):        25.9 C 

Yesterday's (27 Aug 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                         0.11
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                       0.12
Cape D'Aguilar                      0.13
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 27 Aug
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