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Bulletin issued at 23:16 HKT 27/Aug/2017

At 11 p.m. at the Hong Kong Observatory the air temperature was 26 degrees Celsius and the relative humidity 92 per cent.

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 2:00 a.m. tomorrow. Isolated thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 26 degrees;
Wong Chuk Hang 27 degrees;
Ta Kwu Ling 26 degrees;
Lau Fau Shan 25 degrees;
Tai Po 26 degrees;
Sha Tin 27 degrees;
Tuen Mun 27 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 25 degrees;
Hong Kong Park 27 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 26 degrees;
Happy Valley 27 degrees;
Wong Tai Sin 25 degrees;
Stanley 27 degrees;
Kwun Tong 26 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 27 degrees;
Yuen Long Park 26 degrees.

Between 9:45 and 10:45 p.m., the rainfall recorded in various regions were:

North District 0 to 9 mm;
Tai Po 0 to 4 mm;
Sai Kung 0 to 1 mm.


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


Climatological Information for 27 Aug

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Bulletin updated at 23:15 HKT 27/Aug/2017

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

Severe Tropical Storm Pakhar skirted past the southwest of Hong Kong at about 100 kilometres this morning. Under the influence of Pakhar's circulation, winds once reached storm force in the southern part of Hong Kong. Pakhar also brought heavy squally showers and thunderstorms to the territory. More than 100 millimetres of rainfall were recorded over the territory, and rainfall even exceeded 150 millimetres over the urban areas and New Territories East today. Pakhar made landfall over Taishan of Guangdong, moved inland and weakened into an area of low pressure gradually. An active southerly airstream is expected to bring squally showers to the coast of Guangdong tomorrow.

Weather forecast for Hong Kong (Monday, 28 Aug 2017)

Cloudy with squally showers and a few thunderstorms. Showers will be heavy and there will be swells at first. Temperatures will range between 25 and 28 degrees. Moderate to fresh south to southeasterly winds, occasionally strong offshore at first.

Outlook : Weather improving with sunny periods and a few showers in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 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 21:00 HKT 27/Aug/2017

N0 WARNING.

GENERAL SITUATION AT 270900 UTC:
FOR DETAILS ON TROPICAL DEPRESSION PAKHAR (1714), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 271300 UTC:

HONG KONG= S TO SE 5-6, OCNL 7 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 4 M AT FIRST. SWELL S TO SE 3 M. TEMP 25-28 C. =
KWANGTUNG= S TO SE 5-6, 7 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 4 M AT FIRST. SWELL S TO SE 3 M. =
TAIWAN STRAIT= S TO SE 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SE 2 M. =
BASHI= E 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SE 2 M. =
PRATAS= 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. =
BALINTANG= E 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SE 2 M. =
SCARBOROUGH= 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. =
PARACEL= S 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S TO SE 3 M. =
TONKIN= S 5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S 2 M. =
DANANG= S 5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. 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 23:30 HKT 27/Aug/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 27 August 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    An active southerly airstream is affecting the south China coastal waters. Besides, Tropical Depression Pakhar has weakened into an area of low pressure.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South to southeast force 5 to 6, occasionally up to force 7 at first.
    Scattered squally showers and thunderstorms.
    Rough to very rough seas.

    Nan'ao:
    South to southeast force 5 to 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Shanwei, South of Hong Kong and Shangchuan Dao:
    South to southeast force 5 to 6, up to force 7 at first.
    Scattered squally showers and thunderstorms.
    Rough to very rough seas.

    Outlook for the next 48 hours
    South to southeasterly winds of force 4 to 5, occasionally force 6 . Scattered squally showers and thunderstorms.

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

    Waglan Island Wind south-southeast force 5
      Visibility 11 Kilometres

    Shantou Wind east-southeast force 1
      Visibility 18 Kilometres in showers

    Dongsha Wind south force 4
      Visibility 10 Kilometres

    Macau Wind south-southeast force 3
      Visibility 8 Kilometres

    Xisha Wind calm
      Visibility 2600 Metres in showers

  • 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 21:45 HKT 27/AUG/2017
    (Next update at 01:30 HKT 28/AUG/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     GALE FORCE WINDS ON HIGH GROUNDS.
     SEV TURB AND SEV GUSTS.   
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     TROPICAL STORM PAKHAR HAS WEAKENED INTO A TROPICAL DEPRESSION.
     AT 9 P.M., PAKHAR WAS CENTRED AT 23.4 DEGREES NORTH, 109.8
     DEGREES EAST. IT IS FORECAST TO MOVE WEST-NORTHWEST AT
     ABOUT 15 KNOTS FURTHER INLAND AND WEAKEN GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 2200 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  150/15-20
                  TEMPO 170/25G35 IN TS
       OFFSHORE:  150/25-30G40
                  BEC 150/20-25                        28-25
   B.   2000 FT:  160/30-35G45
                  BEC 160/25-30                        23
   C.   5000 FT:  160/30                               18
   D.  10000 FT:  160/30                               11
   E.  18000 FT:  170/20                               MS2
   F.  24000 FT:  150/20                               MS12
   G.  30000 FT:  130/25-30                            MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH SQUALLY SHOWERS AND A FEW THUNDERSTORMS.
   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 3500 M IN SHOWERS.
                      TEMPO 2000 M IN THUNDERSTORMS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11000 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 3.5-5.5 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH SOUTH TO SOUTHEASTERLY WINDS, OCCASIONALLY 
     STRONG OFFSHORE AND ON HIGH GROUNDS.  CLOUDY WITH SQUALLY
     SHOWERS AND A FEW THUNDERSTORMS.=

    ===================================================================
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 20:44 HKT on 27 Aug 17

    VHHK SIGMET 4 VALID 270850/271250 VHHH- VHHK HONG KONG FIR EMBD TS FCST W OF LINE N2306 E11530 - N1806 E11506 TOP FL400 MOV NW 15KT NC= VHHK SIGMET 5 VALID 271250/271650 VHHH- VHHK HONG KONG FIR EMBD TS FCST W OF LINE N2306 E11530 - N1806 E11506 TOP FL400 MOV NW 15KT NC=

    Please click here for more about the SIGMET

    TROPICAL CYCLONE WARNING Skip to main content
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    Tropical Cyclone Warnings

    Bulletin issued at 22:15 HKT 27/Aug/2017

    Tropical Cyclone Warning Bulletin

    Here is the latest Tropical Cyclone Warning Bulletin issued by the Hong Kong Observatory.

    All signals were cancelled at 10:10 p.m.

    At 10 p.m., Tropical Depression Pakhar was centred about 480 kilometres west-northwest of Hong Kong (near 23.5 degrees north 109.7 degrees east) and is forecast to move west-northwest at about 28 kilometres per hour further inland and dissipate gradually.

    With Pakhar moving away from Hong Kong, local winds have further moderated. As there are still swells at first, members of the public should remain on the alert.
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    TROPICAL CYCLONE WARNING FOR SHIPPING
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    Tropical Cyclone Warning for Shipping

    Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
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    Bulletin issued at 21:30 HKT 27/Aug/2017


    Tropical Cyclone Warning

    Tropical Storm Pakhar (1714) has weakened into a Tropical Depression with central pressure 998 hectopascals. At 271200 UTC, it was centred within 90 nautical miles of two three point three degrees north (23.3 N) one one zero point one degrees east (110.1 E) and is forecast to move west-northwest at about 15 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 30 knots.

    Radius of over 2 metre waves 120 nautical miles.

    Forecast position and intensity at 281200 UTC
    Dissipated over land.



    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 00:15 HKT 27/Aug/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     34.3 C
Minimum Air Temperature                     26.2 C
Grass Minimum Temperature                   25.7 C
Relative Humidity                        56 - 93 Percent
Rainfall                                     6.3 mm 
Total rainfall since 1st January          1980.8 mm
Against an average of                     1857.7 mm

Other Stations                Min                  Max
King's Park                  25.9 C               33.3 C
Wong Chuk Hang               26.9 C               33.8 C
Ta Kwu Ling                  24.7 C               34.8 C
Lau Fau Shan                 25.8 C               35.1 C
Tai Po                       25.7 C               33.2 C
Sha Tin                      26.6 C               33.9 C
Tuen Mun                     25.7 C               34.4 C
Tseung Kwan O                25.7 C               33.5 C
Sai Kung                     26.9 C               33.1 C
Cheung Chau                  25.1 C               34.2 C
Chek Lap Kok                 27.1 C               36.1 C
Tsing Yi                     26.4 C               34.9 C
Shek Kong                    25.2 C               35.5 C
Tsuen Wan Ho Koon            24.7 C               33.8 C
Tsuen Wan Shing Mun Valley   25.5 C               34.2 C
Hong Kong Park               25.8 C               33.9 C
Shau Kei Wan                 25.7 C               32.1 C
Kowloon City                 25.5 C               33.8 C
Happy Valley                 27.0 C               34.2 C
Wong Tai Sin                 25.9 C               33.7 C
Stanley                      26.3 C               32.7 C
Kwun Tong                    25.8 C               32.6 C
Sham Shui Po                 26.3 C               34.1 C
Kai Tak Runway Park          26.5 C               32.2 C
Yuen Long Park               25.9 C               35.7 C

Duration of sunshine (King's Park):              9.9 H
The mean UV index recorded at King's Park yesterday was 6,
the UV intensity was High.
The maximum UV index for yesterday was 11.
Sea surface temperature (Waglan Island):        25.8 C 

Yesterday's (26 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                               0.08
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                      0.13
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 26 Aug
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