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Bulletin issued at 03:21 HKT 23/Aug/2017

At 3 a.m. at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 70 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 3 has been issued.
The Hong Kong Observatory announces that the Tropical Cyclone Warning Signal Number 8 is expected to be issued at or before 5:30 a.m. today (23 Aug 2017).

The air temperatures at other places were:

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

Here is the information on Typhoon Hato:
Location: 21.1 degrees north, 115.8 degrees east; Maximum sustained wind near its centre: 130 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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Bulletin updated at 02:45 HKT 23/Aug/2017

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

Weather forecast for today

Strong northerly winds. Winds will continue to strengthen further. Becoming east to southeasterlies in the morning. Cloudy to overcast with heavy squally showers and thunderstorms. Temperatures will range between 26 and 30 degrees. Seas will be rough with swells.

Outlook : Still showery in the following few days.


(The above forecast period is valid up to 23:59 HKT today, 23/08/2017; 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 22/Aug/2017

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

GENERAL SITUATION AT 220900 UTC:
FOR DETAILS ON TYPHOON HATO (1713), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 221300 UTC:

HONG KONG= N 6-7, BEC CYCLONIC UP TO 12. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4 M, BEC 14 M. SWELL E 5-7 M. TEMP 26-30 C. =
KWANGTUNG= N TO NW 10-11, BEC CYCLONIC UP TO 12. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 10 M, BEC 14 M. SWELL E TO NE 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 7, UP TO 8 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL SW 3 M. =
PRATAS= CYCLONIC UP TO 12, BEC SE 9-10. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 14 M. SWELL E 5-7 M. =
BALINTANG= S TO SE 7, UP TO 8 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL SW 3 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 6-7, BEC 11 IN N. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 10 M IN N. SWELL E TO NE 3 M. =
TONKIN= SW 5-6, UP TO 7 LATER. ISOL SHOWERS AND TS. SEA 2-3 M, UP TO 4 M LATER. =
DANANG= SW 5-6. ISOL 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
  • Tidal Information

    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 03:30 HKT 23/Aug/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 23 August 2017

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

    Weather Situation:
    At 3 a.m., Typhoon Hato with maximum sustained winds of about 130 kilometres per hour near its centre was located at 21.1 degrees north, 115.8 degrees east. It is forecast to move west-northwest at about 25 kilometres per hour towards the coast of Guangdong.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North force 7 to 8, becoming cyclonic up to force 12.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas, becoming phenomenal seas.

    Nan'ao:
    Southeast force 8 to 9.
    Frequent heavy squally showers and thunderstorms.
    Very rough to high seas.

    Shanwei:
    Cyclonic up to force 12, becoming southeast up to force 10.
    Frequent heavy squally showers and thunderstorms.
    Phenomenal seas.

    South of Hong Kong:
    Northwest force 7 to 8, becoming cyclonic up to force 12.
    Frequent heavy squally showers and thunderstorms.
    Very rough seas, becoming phenomenal seas.

    Shangchuan Dao:
    Northwest force 6 to 7, becoming southwest up to force 12.
    Frequent heavy squally showers and thunderstorms.
    Rough seas, becoming phenomenal 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 north force 6
      Visibility 27 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 30 Kilometres

    Dongsha Wind south force 6
      Visibility 7 Kilometres in rain

    Huangmaozhou Wind northwest force 7

    Macau Wind north-northwest force 2
      Visibility 6 Kilometres

    Xisha Wind southwest force 4
      Visibility 25 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 01:30 HKT 23/AUG/2017
    (Next update at 9:00-9:30 HKT 23/AUG/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     SEV TURB AND SEV GUSTS.  HURRICANE FORCE WINDS.
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 2 A.M., TYPHOON HATO WAS CENTRED NEAR 21.0
     DEGREES NORTH, 116.0 DEGREES EAST AND IS
     FORECAST TO MOVE WEST-NORTHWEST AT ABOUT 14
     KNOTS TOWARDS THE COAST OF GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  030/20-25G35
                  BECMG 080/45-55G65
       OFFSHORE:  020/25G35
                  BECMG CYCL/65-70G90                  25-31
   B.   2000 FT:  030/25-30G40
                  BECMG CYCL/65-70G90                  24
   C.   5000 FT:  040/30
                  BECMG CYCL/70                        20
   D.  10000 FT:  050/35
                  BECMG CYCL/70                        11
   E.  18000 FT:  060/40
                  BECMG CYCL/70                        MS1
   F.  24000 FT:  070/40
                  BECMG CYCL/70                        MS11
   G.  30000 FT:  080/35
                  BECMG CYCL/60                        MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY TO OVERCAST WITH HEAVY SQUALLY SHOWERS
      AND THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT BKN 6000 FT.  TEMPO CB 800 FT SCT
      CB 1200 FT BKN 4000 FT.
   K. VISIBILITY    : 7 KM. TEMPO 2000 M IN SHOWERS.TEMPO 1200 M IN THUNDERSTORMS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 4-14 M        SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     CYCLONIC HURRICANE FORCE WINDS BECOMING STRONG
     SOUTH TO SOUTHEASTERLIES.  CLOUDY TO OVERCAST
     WITH SQUALLY SHOWERS AND 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 03:24 HKT on 23 Aug 17

    VHHK SIGMET 19 VALID 221715/222115 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1724 E11318 - N1930 E11130 - N2124 E11130 - N2224 E11330 - N2006 E11336 - N1818 E11448 - N1724 E11318 TOP FL450 MOV SW 15KT NC= VHHK SIGMET 17 VALID 221627/222100 VHHH- VHHK HONG KONG FIR TC HATO PSN N2048 E11642 CB OBS AT 1500Z WI 180NM OF TC CENTRE TOP FL450 NC FCST AT 2100Z TC CENTRE PSN N2118 E11506= VHHK SIGMET 20 VALID 221924/230000 VHHH- VHHK HONG KONG FIR TC HATO PSN N2100 E11600 CB OBS AT 1800Z WI 180NM OF TC CENTRE TOP FL450 NC FCST AT 0000Z TC CENTRE PSN N2136 E11412=

    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 03:25 HKT 23/Aug/2017

    Tropical Cyclone Warning Bulletin

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

    The Strong Wind Signal, No. 3 is in force.

    This means that winds with mean speeds of 41 to 62 kilometres per hour are expected.

    At 3 a.m., Typhoon Hato was estimated to be about 220 kilometres southeast of Hong Kong (near 21.1 degrees north 115.8 degrees east) and is forecast to move west-northwest at about 25 kilometres per hour towards the coast of Guangdong.

    The structure of Hato remains rather intact and compact, edging further closer to the coast of Guangdong. Local winds are strengthening. The Observatory will issue the No. 8 Gale or Storm Signal shortly.

    Hato is expected to be closest to Hong Kong around noon time today, skirting within 100 kilometres south of the territory. As the high tide will occur before noon today, and the storm surge induced by Hato may cause a rise in sea levels of about 1 metre or more above normal tide levels, there could be serious flooding in some low-lying areas. Members of the public should stay on the alert and take all precautions against high winds and flooding.

    (Precautionary Announcements with No. 3 Signal)

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

    2. You are advised not to delay in taking all precautions to protect your home or property. Make sure now that all loose objects are secure. Porch furniture, flower pots and other objects likely to be blown away should be taken indoors. Check again and make sure all windows and doors can be securely locked.

    3. Fishing vessels not yet in typhoon shelters should seek shelter without delay. Check again that all deck fittings are firmly fastened. If available, heavy anchors should be prepared and used in addition to regular anchors.

    4. People should avoid walking or working in areas exposed to gales and squalls. Drivers using highways and flyovers should be alert to violent gusts.

    5. Listen to radio, watch TV or browse the Hong Kong Observatory's web site for information on the tropical cyclone.
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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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    Severe Weather Information Centre

    Bulletin issued at 03:30 HKT 23/Aug/2017


    Tropical Cyclone Warning

    At 221800 UTC, Typhoon Hato (1713) with central pressure 965 hectopascals was centred within 30 nautical miles of two one point zero degrees north (21.0 N) one one six point zero degrees east (116.0 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 70 knots.

    Radius of over 33 knot winds 90 nautical miles over northern semicircle, 60 nautical miles elsewhere.
    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 231800 UTC
    Two three point two degrees north (23.2 N)
    One zero eight point six degrees east (108.6 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 241800 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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