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Bulletin issued at 18:02 HKT 12/Jun/2017

At 6 p.m. at the Hong Kong Observatory the air temperature was 26 degrees Celsius and the relative humidity 98 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.3. 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 26 degrees;
Ta Kwu Ling 26 degrees;
Lau Fau Shan 26 degrees;
Tai Po 26 degrees;
Sha Tin 26 degrees;
Tuen Mun 26 degrees;
Tseung Kwan O 26 degrees;
Sai Kung 27 degrees;
Cheung Chau 25 degrees;
Chek Lap Kok 27 degrees;
Tsing Yi 27 degrees;
Shek Kong 26 degrees;
Tsuen Wan Ho Koon 26 degrees;
Tsuen Wan Shing Mun Valley 26 degrees;
Hong Kong Park 26 degrees;
Shau Kei Wan 25 degrees;
Kowloon City 26 degrees;
Happy Valley 26 degrees;
Wong Tai Sin 25 degrees;
Stanley 26 degrees;
Kwun Tong 26 degrees;
Sham Shui Po 26 degrees;
Kai Tak Runway Park 26 degrees;
Yuen Long Park 26 degrees;
Tai Mei Tuk 25 degrees.

Between 4:45 and 5:45 p.m., the rainfall recorded in various regions were:

Yuen Long 0 to 9 mm;
North District 0 to 8 mm;
Tai Po 5 to 8 mm;
Eastern District 5 mm;
Southern District 5 mm;
Tsuen Wan 0 to 3 mm;
Islands District 0 to 2 mm;
Central & Western District 2 mm;
Tuen Mun 2 mm;
Sai Kung 0 to 2 mm.

Here is the information on Tropical Storm Merbok:
Location: 21.8 degrees north, 114.4 degrees east; Maximum sustained wind near its centre: 85 km/h.


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


Climatological Information for 12 Jun

Regional Weather in Hong Kong

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Bulletin updated at 17:45 HKT 12/Jun/2017

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

Weather forecast for tonight and tomorrow

Strong to gale northeasterly winds. Becoming southwesterly winds tomorrow. Cloudy with heavy squally showers and a few thunderstorms. Seas will be very rough with swells. Temperatures will range between 26 and 30 degrees. Winds will moderate gradually and showers will ease off later tomorrow.

Outlook : There will still be showers in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 13/06/2017; 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 12/Jun/2017

GALE WARNING AREAS: HONG KONG, KWANGTUNG, PRATAS AND PARACEL.

GENERAL SITUATION AT 112100 UTC:
FOR DETAILS ON TROPICAL STORM MERBOK (1702), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 120100 UTC:

HONG KONG= E 5-6, BEC N 7, OCNL 8. DOWN TO 1000 M IN OCNL SQUALLY HEAVY SHOWERS AND TS. SEA 3 M, BEC 4-6 M. SWELL SE 2 M. TEMP 32-27 C. =
KWANGTUNG= CYCLONIC 8 IN E, SW 6-7 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6 M. SWELL SE 2-3 M. =
TAIWAN STRAIT= S 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. =
BASHI= S 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SE 2 M. =
PRATAS= CYCLONIC 8, BEC SW 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6 M. SWELL SE 2-3 M. =
BALINTANG= S 6-7. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SE 2 M. =
SCARBOROUGH= S 6-7. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SE 2-3 M. =
PARACEL= S TO SW 7-8. DOWN TO 1000 M IN OCNL SQUALLY HEAVY SHOWERS AND TS. SEA 4-6 M. SWELL SE 2-3 M. =
TONKIN= S 5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2 M. =
DANANG= S 5. ISOL SHOWERS AND TS. SEA 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.


  • Map showing the 10 forecast areas
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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 18:20 HKT 12/Jun/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 6:20 p.m. on 12 June 2017

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

    Weather Situation:
    At 6 p.m., Tropical Storm Merbok with maximum sustained winds of about 85 kilometres per hour near its centre was located at 21.8 degrees north, 114.4 degrees east. It is forecast to move north-northwest at about 20 kilometres per hour in the general direction of Hong Kong.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Northeast force 6 to 7, occasionally force 8, becoming cyclonic force 9.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Nan'ao:
    South to southeast force 6 to 7, becoming southwest force 6 to 7 later.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Shanwei:
    South to southeast force 7 to 8, becoming southwest force 7 to 8 later.
    Frequent heavy squally showers and thunderstorms.
    Very rough seas.

    South of Hong Kong:
    Cyclonic force 8 to 9, becoming southwest force 7 to 8 later.
    Frequent heavy squally showers and thunderstorms.
    Very rough to high seas.

    Shangchuan Dao:
    South to southwest force 5 to 6, occasionally up to force 7.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    Southwesterly winds of force 6. Scattered heavy squally showers and thunderstorms.

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

    Waglan Island Wind east force 9
      Visibility 3900 Metres

    Shantou Wind south-southeast force 3
      Visibility 30 Kilometres

    Dongsha Wind south-southwest force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind northwest force 8

    Macau Wind north force 3
      Visibility 19 Kilometres

    Xisha Wind south-southwest force 3
      Visibility 20 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
  • 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 12/JUN/2017
    (Next update at 01:30 HKT 13/JUN/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     GALE FORCE WINDS.
     SEV TURB AND SEV GUSTS.
     CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 5 P.M., TROPICAL STORM MERBOK WAS CENTRED
     NEAR 21.6 DEGREES NORTH 114.5 DEGREES EAST AND
     IS FORECAST TO MOVE NORTH-NORTHWEST AT ABOUT 10
     KNOTS TOWARDS THE VICINITY OF THE PEARL RIVER
     ESTUARY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  050/30-35G45 BEC 260/25-30G40
                  TEMPO VRB/35G45 IN TS
       OFFSHORE:  CYCLONIC/40-45G55 BEC 240/25-30G40   28-26
   B.   2000 FT:  070/35-40G50 BEC 230/30-35G45        22
   C.   5000 FT:  080/35 BEC 230/35                    19
   D.  10000 FT:  100/30 BEC 230/35                    12
   E.  18000 FT:  090/30 BEC 260/25                    MS1
   F.  24000 FT:  080/30 BEC 210/20                    MS10
   G.  30000 FT:  060/25                               MS23
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH HEAVY 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 1200 FT  BKN 4000 FT.
   K. VISIBILITY    : 9 KM.  TEMPO 3000 M IN SHOWERS.
                      TEMPO 1500 M IN TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 10600 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 4.0-8.0 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     FRESH TO STRONG SOUTHWESTERLY WINDS.  CLOUDY.
     HEAVY SQUALLY SHOWERS WITH A FEW THUNDERSTORMS
     AT FIRST.  SHOWERS WILL EASE OFF LATER.=

    ===================================================================
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 18:30 HKT on 12 Jun 17

    VHHK SIGMET 5 VALID 120730/121200 VHHH- VHHK HONG KONG FIR TC MERBOK PSN N2106 E11448 CB OBS AT 0600Z WI 150NM OF TC CENTRE TOP FL450 NC FCST AT 1200Z TC CENTRE PSN N2200 E11448= VHHK SIGMET 7 VALID 121030/121500 VHHH- VHHK HONG KONG FIR TC MERBOK PSN N2136 E11430 CB OBS AT 0900Z WI 150NM OF TC CENTRE TOP FL450 NC FCST AT 1500Z TC CENTRE PSN N2230 E11418=

    Please click here for more about the SIGMET

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    Tropical Cyclone Warnings

    Bulletin issued at 17:45 HKT 12/Jun/2017

    Tropical Cyclone Warning Bulletin

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

    The No. 8 Northeast 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 northeast quarter.

    At 6 p.m., Tropical Storm Merbok was centred about 60 kilometres south-southeast of Hong Kong Observatory (near 21.8 degrees north 114.4 degrees east) and is forecast to move north-northwest at about 20 kilometres per hour in the general direction of Hong Kong.

    In the past few hours, local winds were strengthening as Merbok continued to edge closer to Hong Kong. According to the current forecast track, Merbok is expected to make landfall within 50 kilometers of Hong Kong before midnight tonight. Its centre may even pass over Hong Kong, bringing gales and heavy rain to parts of the territory. Members of the public should stay on the alert.

    The Number 8 Gale or Storm Signal is expected to remain in force tonight.

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

    In the past hour, the maximum sustained winds recorded at Waglan Island, Green Island and Cheung Chau were 82, 56 and 44 kilometres per hour with maximum gusts 94, 68 and 62 kilometres per hour respectively.

    (Precautionary Announcements with No. 8 Signal)

    1. Complete all precautions in your home. Lock all windows and doors, fit bars into position and insert reinforced shutters and gates if they are available. Adhesive tape fixed to large window-panes in exposed positions will reduce damage by broken glass. Storm water drains should be cleared of leaves and rubbish.

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

    3. 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.

    4. Owners of neon signs are reminded that they should now arrange for the electricity supply to their signs to be cut off.

    5. 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 18:30 HKT 12/Jun/2017


    Tropical Cyclone Warning

    At 120900 UTC, Tropical Storm Merbok (1702) with central pressure 988 hectopascals was centred within 60 nautical miles of two one point six degrees north (21.6 N) one one four point five degrees east (114.5 E) and is forecast to move north or north-northwest at about 10 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 45 knots.

    Radius of over 33 knot winds 60 nautical miles over eastern semicircle, 30 nautical miles elsewhere.
    Radius of over 2 metre waves 120 nautical miles over eastern semicircle, 60 nautical miles elsewhere.

    Forecast position and intensity at 130900 UTC
    Two five point three degrees north (25.3 N)
    One one five point one degrees east (115.1 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 140900 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 12/Jun/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     34.1 C
Minimum Air Temperature                     28.1 C
Grass Minimum Temperature                   27.1 C
Relative Humidity                        66 - 88 Percent
Rainfall                                      Trace 
Total rainfall since 1st January           539.2 mm
Against an average of                      818.6 mm

Other Stations                Min                  Max
King's Park                  27.4 C               32.9 C
Wong Chuk Hang               26.3 C               31.6 C
Ta Kwu Ling                  25.7 C               35.3 C
Lau Fau Shan                 27.2 C               33.5 C
Tai Po                       26.6 C               33.0 C
Sha Tin                      26.7 C               33.6 C
Tuen Mun                     27.4 C               34.8 C
Tseung Kwan O                26.6 C               33.2 C
Sai Kung                     27.3 C               33.4 C
Cheung Chau                  26.9 C               32.7 C
Chek Lap Kok                 28.5 C               34.1 C
Tsing Yi                     27.6 C               33.5 C
Shek Kong                    26.7 C               34.7 C
Tsuen Wan Ho Koon            26.3 C               32.6 C
Tsuen Wan Shing Mun Valley   27.2 C               33.1 C
Hong Kong Park               27.7 C               33.6 C
Shau Kei Wan                 27.0 C               32.2 C
Kowloon City                 27.3 C               33.6 C
Happy Valley                 27.1 C               33.9 C
Wong Tai Sin                 27.2 C               33.6 C
Stanley                      27.5 C               33.8 C
Kwun Tong                    27.7 C               32.7 C
Sham Shui Po                 28.0 C               34.0 C
Kai Tak Runway Park          27.8 C               31.8 C
Yuen Long Park               26.8 C               34.5 C
Tai Mei Tuk               27.3 C               34.7 C

Duration of sunshine (King's Park):              8.7 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):        26.1 C 

Yesterday's (11 Jun 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                             0.08
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                         0.14
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 11 Jun
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