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Bulletin issued at 16:02 HKT 23/Aug/2017

At 4 p.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 93 per cent.
During the past hour the mean UV Index recorded at King's Park was 1. The intensity of UV radiation was low.

Please be reminded that:

The Tropical Cyclone Signal No. 8 has been issued.

The air temperatures at other places were:

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

Between 2:45 and 3:45 p.m., the rainfall recorded in various regions were:

Sha Tin 2 to 9 mm;
Tai Po 0 to 8 mm;
Kwun Tong 3 to 7 mm;
Eastern District 2 to 7 mm;
Wong Tai Sin 1 to 6 mm;
Sai Kung 0 to 5 mm;
Southern District 0 to 5 mm;
Kowloon City 1 to 4 mm;
North District 0 to 4 mm;
Yuen Long 0 to 4 mm;
Wan Chai 2 to 3 mm;
Tsuen Wan 0 to 3 mm;
Islands District 0 to 2 mm;
Sham Shui Po 0 to 1 mm;
Yau Tsim Mong 1 mm;
Tuen Mun 0 to 1 mm;
Kwai Tsing 0 to 1 mm.

Here is the information on Typhoon Hato:
Location: 22.4 degrees north, 112.5 degrees east; Maximum sustained wind near its centre: 140 km/h.


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


Climatological Information for 23 Aug

Regional Weather in Hong Kong

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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 16:15 HKT 23/Aug/2017

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

Weather forecast for tonight and tomorrow

Gale south to southeasterly winds at first. Winds will weaken further. Seas will be very rough with swells at first. Cloudy with squally showers. Showers will ease off tomorrow. Temperatures will range between 27 and 31 degrees.

Outlook : Still showery in the following few days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 24/08/2017; 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 23/Aug/2017

HURRICANE WARNING AREAS: HONG KONG AND KWANGTUNG.
STORM WARNING AREAS: PRATAS AND PARACEL.
GALE WARNING AREA: TAIWAN STRAIT.

GENERAL SITUATION AT 222100 UTC:
FOR DETAILS ON TYPHOON HATO (1713), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 230100 UTC:

HONG KONG= CYCLONIC UP TO 12, E TO SE UP TO 12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 14 M. SWELL S TO SE 5-7 M. TEMP 30-27 C. =
KWANGTUNG= SE UP TO 12. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 14 M. SWELL S TO SE 5-7 M. =
TAIWAN STRAIT= SE 7, UP TO 8 IN S AT FIRST. DOWN TO 1000 M IN OCNL SQUALLY HEAVY SHOWERS AND TS. SEA 6 M. SWELL SE 3 M. =
BASHI= S TO SE 6-7. DOWN TO 1000 M IN OCNL SQUALLY HEAVY SHOWERS AND TS. SEA 3-4 M. SWELL SW 3-5 M. =
PRATAS= S TO SE 9-10. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 10 M. SWELL S TO SE 5-7 M. =
BALINTANG= S TO SE 6-7. DOWN TO 1000 M IN OCNL SQUALLY HEAVY SHOWERS AND TS. SEA 3-4 M. SWELL SW 3-5 M. =
SCARBOROUGH= S TO SW 6-7. DOWN TO 1000 M IN OCNL SQUALLY HEAVY SHOWERS AND TS. SEA 3-4 M. SWELL S 2 M. =
PARACEL= SW 8-9, 11 IN N. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 10 M. SWELL S TO SE 3-5 M. =
TONKIN= SW 5-6, UP TO 7 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 4 M LATER. =
DANANG= SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 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
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    • SOUTH CHINA COASTAL WATERS
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    Bulletin issued at 16:30 HKT 23/Aug/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 23 August 2017

    Warnings:
    Storm force winds in Shangchuan Dao. Gale force winds in Hong Kong adjacent waters, Nan'ao, Shanwei and south of Hong Kong.

    Weather Situation:
    Severe Typhoon Hato has weakened into a typhoon. At 4 p.m., Hato with maximum sustained winds of about 140 kilometres per hour near its centre was located near 22.4 degrees north, 112.5 degrees east. It is forecast to move west-northwest at about 25 kilometres per hour towards inland Guangdong, and weaken gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South to southeast force 6 to 7, force 8 to 9 at first.
    Scattered heavy squally showers and thunderstorms.
    Very rough seas.

    Nan'ao:
    South to southeast force 6 to 7, occasionally force 8.
    Scattered heavy squally showers and thunderstorms.
    Very rough seas.

    Shanwei:
    Southeast force 6 to 7, occasionally force 8.
    Scattered heavy squally showers and thunderstorms.
    Very rough seas.

    South of Hong Kong:
    Southeast force 6 to 7, force 8 to 9 at first.
    Scattered heavy squally showers and thunderstorms.
    Very rough seas.

    Shangchuan Dao:
    South to southwest force 6 to 7, up to force 9 to 10 at first.
    Frequent heavy squally showers and thunderstorms.
    Very high seas.

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

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

    Waglan Island Wind south-southeast force 6
      Visibility 2400 Metres

    Shantou Wind east force 2
      Visibility 28 Kilometres

    Dongsha Wind south force 4
      Visibility 9 Kilometres

    Huangmaozhou Wind north force 5

    Xisha Wind southwest force 4
      Visibility 20 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
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    Weather Forecast for Local Aviation

    Bulletin issued at 09:30 HKT 23/AUG/2017
    (Next update at 17:30 HKT 23/AUG/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     HURRICANE FORCE WINDS.
     SEV TURB AND SEV GUSTS.
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     TYPHOON HATO HAS INTENSIFIED INTO A SEVERE
     TYPHOON.
     AT 9 A.M., SEVERE TYPHOON HATO WAS CENTRED NEAR
     21.6 DEGREES NORTH 114.3 DEGREES EAST AND IS
     FORECAST TO MOVE WEST-NORTHWEST AT ABOUT 14
     KNOTS TOWARDS THE VICINITY OF THE PEARL RIVER
     ESTUARY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  050/55-65G75 BEC 130/35-40G50
       OFFSHORE:  CYCLONIC/70-75G90 BEC 130/45-50G60   25-28
   B.   2000 FT:  050/60-65G75 BEC 150/45-50G60        23
   C.   5000 FT:  060/65 BEC 160/40                    20
   D.  10000 FT:  070/60 BEC 160/45                    12
   E.  18000 FT:  070/65 BEC 160/40                    MS1
   F.  24000 FT:  070/60 BEC 160/45                    MS10
   G.  30000 FT:  070/65 BEC 140/45                    MS22
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY TO OVERCAST WITH HEAVY SQUALLY SHOWERS
      AND ISOLATED THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1000 FT  SCT 3000 FT  BKN 6000 FT.  TEMPO
      FEW CB 800 FT  SCT 1500 FT  BKN 4000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 1500 M IN SHOWERS/TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11000 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 10-14 M       SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     STRONG SOUTHEASTERLY WINDS.  CLOUDY TO OVERCAST
     WITH HEAVY SQUALLY SHOWERS AND ISOLATED
     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 13:45 HKT on 23 Aug 17

    VHHK SIGMET 5 VALID 230545/230945 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2024 E11130 - N2124 E11130 - N2218 E11318 - N2000 E11318 - N2024 E11130 TOP FL450 MOV W 15KT NC= VHHK SIGMET 1 VALID 230145/230600 VHHH- VHHK HONG KONG FIR TC HATO PSN N2130 E11430 CB OBS AT 0000Z WI 210NM OF TC CENTRE TOP FL450 NC FCST AT 0600Z TC CENTRE PSN N2200 E11248=

    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 15:45 HKT 23/Aug/2017

    Tropical Cyclone Warning Bulletin

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

    The No. 8 Southeast Gale or Storm Signal is in force.

    This means that winds with mean speeds of 63 kilometres per hour or more are expected from the southeast quarter.

    Severe Typhoon Hato has weakened into a typhoon.

    At 4 p.m., Hato was centred about 170 kilometres west of Hong Kong (near 22.4 degrees north 112.5 degrees east) and is forecast to move west-northwest at about 25 kilometres per hour into inland Guangdong, and weaken gradually.

    As Hato is moving away from Hong Kong gradually, local winds are subsiding. However, gale force winds are still occasionally affecting the southwestern part of Hong Kong. When local winds weaken further, the Observatory will consider issuing the Strong Wind Signal No.3 before 6 p.m..

    In the past hour, the maximum sustained winds recorded at Ngong Ping were 77 kilometres per hour with maximum gusts 127 kilometres per hour.

    (Precautionary Announcements with No. 8 Signal)

    1. Although the tropical cyclone is moving away from Hong Kong, gales are expected to persist for some time. You are advised to stay indoors until winds moderate and it is safe to go out. On no account should you touch electric cables that have been blown loose.

    2. Since seas are very rough and there are swells, you are advised to stay away from the shoreline and not to engage in water sports.

    3. As gales and violent squalls are still occurring in places, precautions should not yet be relaxed.

    4. Park your car where it is least likely to be damaged.

    5. Do not stand near windows on the exposed side of your home. Move all furniture and valuables away from these areas. Make sure you have a safe place to shelter, should windows be broken.

    6. Flights at Hong Kong International Airport may be affected by the weather. Please contact your airline for the latest flight information before departing for the airport.

    7. Please listen to radio or watch TV for the latest weather information broadcast. You can also browse the Hong Kong Observatory's web site for the information.
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    TROPICAL CYCLONE WARNING FOR SHIPPING
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    Tropical Cyclone Warning for Shipping

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    Severe Weather Information Centre

    Bulletin issued at 15:30 HKT 23/Aug/2017


    Tropical Cyclone Warning

    At 230600 UTC, Severe Typhoon Hato (1713) with central pressure 950 hectopascals was centred within 60 nautical miles of two two point two degrees north (22.2 N) one one two point nine degrees east (112.9 E) and is forecast to move west-northwest at about 14 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 85 knots.

    Radius of over 33 knot winds 90 nautical miles.
    Radius of over 47 knot winds 45 nautical miles.
    Radius of over 63 knot winds 30 nautical miles.
    Radius of over 2 metre waves 180 nautical miles.

    Forecast position and intensity at 240600 UTC
    Two three point six degrees north (23.6 N)
    One zero six point three degrees east (106.3 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 250600 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 23/Aug/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     36.6 C
Minimum Air Temperature                     28.0 C
Grass Minimum Temperature                   27.8 C
Relative Humidity                        53 - 87 Percent
Rainfall                                     2.0 mm 
Total rainfall since 1st January          1907.3 mm
Against an average of                     1800.0 mm

Other Stations                Min                  Max
King's Park                  27.0 C               36.9 C
Wong Chuk Hang               27.7 C               35.2 C
Ta Kwu Ling                  26.6 C               38.5 C
Lau Fau Shan                 26.7 C               37.4 C
Tai Po                       27.3 C               35.0 C
Sha Tin                      28.5 C               38.1 C
Tuen Mun                     27.2 C               37.4 C
Tseung Kwan O                26.2 C               37.9 C
Sai Kung                     27.4 C               36.1 C
Cheung Chau                  26.8 C               35.3 C
Chek Lap Kok                 26.6 C               37.5 C
Tsing Yi                     28.2 C               37.3 C
Shek Kong                    27.4 C               37.9 C
Tsuen Wan Ho Koon            27.2 C               35.3 C
Tsuen Wan Shing Mun Valley   27.7 C               36.8 C
Hong Kong Park               26.5 C               35.7 C
Shau Kei Wan                 24.8 C               35.8 C
Kowloon City                 27.2 C               37.9 C
Happy Valley                 27.6 C               37.6 C
Wong Tai Sin                 27.6 C               37.9 C
Stanley                      25.3 C               35.1 C
Kwun Tong                    26.4 C               37.0 C
Sham Shui Po                 28.0 C               38.1 C
Kai Tak Runway Park          26.0 C               37.3 C
Yuen Long Park               28.6 C               38.6 C
Tai Mei Tuk               26.1 C               36.4 C

Duration of sunshine (King's Park):              7.3 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.
Sea surface temperature (Waglan Island):        25.2 C 

Yesterday's (22 Aug 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 to
0.15 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                           0.09
Tap Mun                             0.09
Kat O                               0.08
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.11
Sai Wan Ho                          0.09
King's Park                         0.15
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.15

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 22 Aug
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