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Bulletin issued at 19:02 HKT 22/Aug/2017

At 7 p.m. at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 79 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 3 has been issued.

The air temperatures at other places were:

King's Park 29 degrees;
Wong Chuk Hang 29 degrees;
Ta Kwu Ling 27 degrees;
Lau Fau Shan 27 degrees;
Tai Po 28 degrees;
Sha Tin 29 degrees;
Tuen Mun 27 degrees;
Tseung Kwan O 28 degrees;
Sai Kung 29 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 30 degrees;
Shek Kong 29 degrees;
Tsuen Wan Ho Koon 28 degrees;
Tsuen Wan Shing Mun Valley 29 degrees;
Hong Kong Park 28 degrees;
Shau Kei Wan 28 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 30 degrees;
Tai Mei Tuk 28 degrees.

Between 5:45 and 6:45 p.m., lightning was detected within New Territories West. The rainfall recorded in various regions were:

Islands District 0 to 3 mm;
Tuen Mun 0 to 2 mm;
Yuen Long 0 to 1 mm.

Here is the information on Typhoon Hato:
Location: 20.5 degrees north, 117.5 degrees east; Maximum sustained wind near its centre: 120 km/h.


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


Climatological Information for 22 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 18:45 HKT 22/Aug/2017

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

Weather forecast for tonight and tomorrow

Strong northerly winds, continue to strengthen. Becoming east to southeasterlies tomorrow morning. Cloudy to overcast with heavy squally showers and thunderstorms. Temperatures will range between 26 and 30 degrees tomorrow. 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 tomorrow, 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 09:00 HKT 22/Aug/2017

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

GENERAL SITUATION AT 212100 UTC:
FOR DETAILS ON TROPICAL STORM HATO (1713), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 220100 UTC:

HONG KONG= W TO NW 4-5, CYCLONIC 10-11 LATER. DOWN TO 4000 M IN HAZE AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS LATER. SEA UP TO 12 M. SWELL E 3 M. TEMP 34-28 C. =
KWANGTUNG= NW 7-8, CYCLONIC 10-11 IN E LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS LATER. SEA 4-6 M, UP TO 12 M IN E LATER. SWELL E 3 M. =
TAIWAN STRAIT= NE 5-6, UP TO 9 IN S LATER. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS IN S. SEA 2-3 M, UP TO 8 M IN S LATER. SWELL NE 3-4 M. =
BASHI= CYCLONIC 10, BEC S 7-8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 10 M. SWELL E TO NE 3 M. =
PRATAS= W TO NW 7-8, BEC CYCLONIC 10. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 10 M. SWELL E TO NE 3 M. =
BALINTANG= W TO SW 10, S 7-8 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 10 M. SWELL NE 3 M. =
SCARBOROUGH= W TO SW 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
PARACEL= NW 4-5, SW 9-10 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 10 M. SWELL NE 2-3 M. =
TONKIN= SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= SW 4-5, UP TO 6 LATER. ISOL SHOWERS AND TS. SEA UP TO 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 19:30 HKT 22/Aug/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 22 August 2017

    Warnings:
    Hurricane force winds in all areas.

    Weather Situation:
    At 7 p.m., Typhoon Hato with maximum sustained winds of about 120 kilometres per hour near its centre was located at 20.5 degrees north, 117.5 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 6 to 7, becoming cyclonic up to force 12.
    Frequent heavy squally showers and thunderstorms.
    Rough seas, becoming phenomenal seas.

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

    Shanwei:
    North to northwest force 10 to 11, becoming cyclonic up to force 12.
    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
    Southeasterly winds of force 5 to 6. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind east force 6
      Visibility 8 Kilometres

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

    Dongsha Wind north force 5
      Visibility 10 Kilometres

    Huangmaozhou Wind north force 3

    Macau Wind east-southeast force 3
      Visibility 7 Kilometres in thunderstorms

    Xisha Wind west force 2
      Visibility 29 Kilometres

  • Explanation of Seas or Sea Waves
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  • Descriptive Terms of Wind Speeds
  • Visibility Readings in Hong Kong Waters
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 22/AUG/2017
    (Next update at 01:30 HKT 23/AUG/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS, SEV TURB AND SEV GUSTS.  
     GALE FORCE WINDS ON HIGH GROUNDS. 
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 6 P.M., TYPHOON HATO WAS CENTRED NEAR  20.5
     DEGREES NORTH, 117.6 DEGREES EAST. IT 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 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  360/20-25G35
                  TEMPO VRB/30G40 IN TS                29-26
   B.   2000 FT:  060/20-25
                  BECMG 360/25-35G40                   25
   C.   5000 FT:  360/15
                  BECMG  060/40                        22
   D.  10000 FT:  010/25
                  BECMG 050/40                         12
   E.  18000 FT:  060/25
                  BECMG 060/40                         MS2
   F.  24000 FT:  070/25
                  BECMG/40                             MS12
   G.  30000 FT:  080/25
                  BECMG/40                             MS26
   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 5000 FT.  
      TEMPO FEW CB 800 FT  SCT 1200 FT BKN 4000 FT
   K. VISIBILITY    : 7 KM.  TEMPO 3000 M IN SHOWERS. 
                      TEMPO 2000 M IN THUNDERSTORMS
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     STRONG TO GALE NORTH TO NORTHEASTERLY WINDS,
     CYCLONIC UP TO HURRICANE FORCE WINDS OFFSHORE.
     CLOUDY TO OVERCAST WITH HEAVY 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 19:25 HKT on 22 Aug 17

    VHHK SIGMET 12 VALID 221125/221525 VHHH- VHHK HONG KONG FIR EMBD TS FCST W OF E114 N OF N20 TOP FL450 MOV SW 15KT NC= VHHK SIGMET 9 VALID 221125/221725 VHHH- VHHK HONG KONG FIR TC HATO PSN N2042 E11712 CB FCST AT 1125Z WI 180NM OF TC CENTRE TOP FL450 NC FCST AT 1725Z TC CENTRE PSN N2106 E11554=

    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 18:45 HKT 22/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 7 p.m., Typhoon Hato was estimated to be about 400 kilometres east-southeast of Hong Kong (near 20.5 degrees north 117.5 degrees east) and is forecast to move west-northwest at about 25 kilometres per hour towards the coast of Guangdong.

    According to the present forecast track, Hato is expected to be closest to Hong Kong tomorrow morning (Wednesday) and may skirt within 100 kilometres south of the territory, posing a considerable threat to the territory. Unless Hato takes a track further away from Hong Kong or weakens, the Observatory will consider issuing the No. 8 Gale or Storm Signal around midnight.

    Heavy squally showers will affect Hong Kong progressively. As the high tide will occur before noon tomorrow, there may be serious flooding in some low-lying areas. Members of the public should take all precautions against strong winds and flooding as early as possible.

    As the sea is rough and there are swells, members of the public should stay away from the shoreline and not to engage in water sports.

    (Precautionary Announcements with No. 3 Signal)

    1. Storm water drains should be cleared of leaves and rubbish, this applies particularly to dwellers in low-lying areas.

    2. 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.

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

    4. 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

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    Severe Weather Information Centre

    Bulletin issued at 18:30 HKT 22/Aug/2017


    Tropical Cyclone Warning

    Severe Tropical Storm Hato (1713) has intensified into a Typhoon with central pressure 970 hectopascals. At 220900 UTC, it was centred within 60 nautical miles of two zero point five degrees north (20.5 N) one one seven point eight degrees east (117.8 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 65 knots.

    Radius of over 33 knot winds 60 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 230900 UTC
    Two two point four degrees north (22.4 N)
    One one two point one degrees east (112.1 E)
    Maximum winds 65 knots.

    Forecast position and intensity at 240900 UTC
    Two three point three degrees north (23.3 N)
    One zero five point one degrees east (105.1 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 250900 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 22/Aug/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     34.5 C
Minimum Air Temperature                     28.6 C
Grass Minimum Temperature                   27.3 C
Relative Humidity                        54 - 86 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          1905.3 mm
Against an average of                     1775.5 mm

Other Stations                Min                  Max
King's Park                  28.1 C               34.8 C
Wong Chuk Hang               27.6 C               35.2 C
Ta Kwu Ling                  25.3 C               37.7 C
Lau Fau Shan                 27.9 C               36.2 C
Tai Po                       27.0 C               35.5 C
Sha Tin                      27.5 C               37.3 C
Tuen Mun                     27.8 C               35.8 C
Tseung Kwan O                27.4 C               36.4 C
Sai Kung                     27.7 C               35.5 C
Cheung Chau                  27.2 C               36.4 C
Chek Lap Kok                 28.4 C               37.5 C
Tsing Yi                     26.8 C               35.7 C
Shek Kong                    27.0 C               37.5 C
Tsuen Wan Ho Koon            26.2 C               35.1 C
Tsuen Wan Shing Mun Valley   26.7 C               36.7 C
Hong Kong Park               27.7 C               35.5 C
Shau Kei Wan                 27.9 C               36.8 C
Kowloon City                 27.8 C               37.3 C
Happy Valley                 28.5 C               37.3 C
Wong Tai Sin                 27.2 C               37.3 C
Stanley                      28.2 C               35.4 C
Kwun Tong                    28.5 C               36.2 C
Sham Shui Po                 27.6 C               37.1 C
Kai Tak Runway Park          28.2 C               35.2 C
Yuen Long Park               27.8 C               37.4 C
Tai Mei Tuk               27.3 C               35.5 C

Duration of sunshine (King's Park):              10.1 H
The mean UV index recorded at King's Park yesterday was 5,
the UV intensity was Moderate.
The maximum UV index for yesterday was 10.
Sea surface temperature (Waglan Island):        25.4 C 

Yesterday's (21 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                           0.08
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                           0.10
Sai Wan Ho                          0.08
King's Park                         0.15
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 21 Aug
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