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

At 11 p.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 94 per cent.

The air temperatures at other places were:

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

Here is the information on Tropical Storm Hato at 11 p.m.:
Location: 22.7 degrees north, 110.1 degrees east.


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


Climatological Information for 23 Aug

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

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

Tropical Cyclone Hato intensified into a severe typhoon this morning and skirted to the south of Hong Kong, bringing hurricane force winds with heavy squally showers and thunderstorms to the territory. As Hato made landfall over Zhuhai in the afternoon and moved inland, it weakened gradually into a tropical storm. Local winds subsided significantly. Locally, more than 50 millimetres of rainfall were recorded over the territory today. Rainbands associated with Hato will continue to affect Guangdong and the northern part of the South China Sea tomorrow.

Severe Tropical Storm Hato has weakened into a tropical storm. At 11 p.m., Hato was centred about 190 kilometres east of Nanning and is forecast to move west-northwest at about 25 kilometres per hour further inland and weaken gradually.

Weather forecast for Hong Kong (Thursday, 24 Aug 2017)

Cloudy with squally showers. Showers will ease off gradually. Temperatures will range between 26 and 31 degrees. Moderate to fresh south to southeasterly winds, occasionally strong offshore at first. There will be swells at first.

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 21:00 HKT 23/Aug/2017

N0 WARNING.

GENERAL SITUATION AT 230900 UTC:
FOR DETAILS ON TYPHOON HATO (1713), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 231300 UTC:

HONG KONG= S TO SE 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL S TO SE 3-5 M. TEMP 26-31 C. =
KWANGTUNG= S TO SE 5-6, OCNL 7. DOWN TO 1000 M IN OCNL SQUALLY HEAVY SHOWERS AND TS IN W. SEA UP TO 4 M. SWELL S TO SE 3-5 M. =
TAIWAN STRAIT= S TO SE 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL SE 3 M. =
BASHI= S TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 3-5 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 3-5 M. =
BALINTANG= S TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 3-5 M. =
SCARBOROUGH= S TO SW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL S 2 M. =
PARACEL= S 5-6, UP TO 7 IN N. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL S TO SE 3-5 M. =
TONKIN= SW 6-7. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL S TO SW 2 M. =
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.


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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 23/Aug/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 23 August 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    Severe Tropical Storm Hato has weakened into a tropical storm. At 11 p.m., Hato with maximum sustained winds of about 85 kilometres per hour near its centre was located at 22.7 degrees north, 110.1 degrees east. It is forecast to move west-northwest at about 25 kilometres per hour further inland and weaken gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South to southeast force 4 to 5, occasionally force 6.
    Scattered squally showers and thunderstorms.
    Very rough seas.

    Nan'ao, Shanwei and South of Hong Kong:
    South to southeast force 4 to 5, occasionally force 6.
    Scattered squally showers and thunderstorms.
    Very rough seas.

    Shangchuan Dao:
    South to southeast force 6 to 7.
    Scattered squally showers and thunderstorms.
    Very rough seas.

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

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

    Waglan Island Wind east-southeast force 5
      Visibility 11 Kilometres

    Shantou Wind east force 2
      Visibility 21 Kilometres

    Dongsha Wind south force 3
      Visibility 10 Kilometres

    Xisha Wind south-southwest force 4
      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 17:30 HKT 23/AUG/2017
    (Next update at 01:30 HKT 24/AUG/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS, SEV TURB AND SEV GUSTS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     SEVERE TYPHOON HATO HAS WEAKENED INTO A TYPHOON.
     AT 5 P.M., HATO WAS CENTRED NEAR 22.5 DEGREES
     NORTH, 112.2 DEGREES EAST. IT IS FORECAST TO
     MOVE WEST-NORTHWEST AT ABOUT 14 KNOTS TOWARDS
     INLAND GUANGDONG, AND WEAKEN GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  140/20-25
       OFFSHORE:  160/25-30G40
                  BEC 160/20-25                        28-26
   B.   2000 FT:  160/25-30G40
                  BEC 160/20-25                        23
   C.   5000 FT:  170/35-40
                  BEC 170/30                           19
   D.  10000 FT:  170/40-45
                  BEC 170/30                           12
   E.  18000 FT:  170/40
                  BEC 170/30                           MS1
   F.  24000 FT:  160/45
                  BEC 160/30                           MS10
   G.  30000 FT:  140/45
                  BEC 140/30                           MS24
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH SQUALLY SHOWERS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 2500 FT  BKN 6000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 2500 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11000 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 3.5-5.0 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     FRESH TO STRONG SOUTH TO SOUTHEASTERLY WINDS.
     CLOUDY WITH SQUALLY 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 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 20:45 HKT 23/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 8:40 p.m.

    At 9 p.m., Severe Tropical Storm Hato was centred about 340 kilometres west of Hong Kong (near 22.6 degrees north 110.9 degrees east) and is forecast to move west-northwest at about 25 kilometres per hour further inland and weaken gradually.

    With Hato weakening and 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 23/Aug/2017


    Tropical Cyclone Warning

    Typhoon Hato (1713) has weakened into a Severe Tropical Storm with central pressure 984 hectopascals. At 231200 UTC, it was centred within 60 nautical miles of two two point six degrees north (22.6 N) one one one point zero degrees east (111.0 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 50 knots.

    Radius of over 33 knot winds 60 nautical miles.
    Radius of over 47 knot winds 30 nautical miles.
    Radius of over 2 metre waves 150 nautical miles.

    Forecast position and intensity at 241200 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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