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Bulletin issued at 04:16 HKT 12/Jun/2017

At 4 a.m. at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 86 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.
The Very Hot Weather Warning is now in force. Very hot weather might cause adverse health effects. Members of the public should take care to avoid heatstroke.

The air temperatures at other places were:

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

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

Eastern District 0 to 6 mm;
Sai Kung 0 to 4 mm;
Kwun Tong 0 to 3 mm;
Southern District 0 to 2 mm.

Here is the information on Tropical Storm Merbok:
Location: 19.5 degrees north, 115.7 degrees east; Maximum sustained wind near its centre: 75 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 03:45 HKT 12/Jun/2017

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

Weather forecast for today

A few showers. Becoming cloudy. More showery with squally thunderstorms later. Temperatures will range between 28 and 33 degrees. Moderate easterly winds, becoming fresh northwesterlies later, occasionally strong offshore. There will be swells.

Outlook : Occasional heavy squally showers at first on Tuesday. Remaining unsettled with showers in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 12/06/2017; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

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SOUTH CHINA COASTAL WATERS
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Bulletin issued at 03:30 HKT 12/Jun/2017

Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 12 June 2017

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

Weather Situation:
At 3 a.m., Tropical Storm Merbok with maximum sustained winds of about 65 kilometres per hour near its centre was located at 19.4 degrees north, 115.8 degrees east, it is forecast to move north or north-northwest at about 20 kilometres per hour crossing the northern part of the South China Sea.

Area forecasts for the next 24 hours

Hong Kong Adjacent Waters:
Southeast force 4 to 5, becoming northwest force 6 later.
Occasional squally showers and thunderstorms.
Moderate seas, becoming rough seas later.

Nan'ao:
Southeast force 5 to 6, becoming force 7 to 8.
Frequent heavy squally showers and thunderstorms.
Moderate to rough seas, becoming very rough seas.

Shanwei:
Southeast force 5 to 6, becoming cyclonic force 8 to 9.
Frequent heavy squally showers and thunderstorms.
Moderate to rough seas, becoming very rough to high seas.

South of Hong Kong:
South to southeast force 4 to 5, becoming southwest force 6 to 7 later.
Occasional squally showers and thunderstorms.
Moderate seas, becoming rough seas later.

Shangchuan Dao:
South to southwest force 4 to 5.
Scattered squally showers and thunderstorms.
Moderate seas.

Outlook for the next 48 hours
Southwesterly winds of force 6, cyclonic winds of up to force 8 to 9 in east at first. Frequent heavy squally showers and thunderstorms in east.

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

Waglan Island Wind east-northeast force 4
  Visibility 37 Kilometres

Shantou Wind east-northeast force 1
  Visibility 30 Kilometres

Dongsha Wind southeast force 4
  Visibility 10 Kilometres

Huangmaozhou Wind northeast force 3

Macau Wind east-northeast force 1
  Visibility 35 Kilometres

Xisha Wind southwest force 3
  Visibility 28 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 12/JUN/2017
    (Next update at 9:00-9:30 HKT 12/JUN/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 1 A.M., TROPICAL STORM MERBOK WAS ESTIMATED
     TO BE ABOUT 410 KILOMETRES SOUTH-SOUTHEAST OF
     HONG KONG (NEAR 19.0 DEGREES NORTH 116.0 DEGREES
     EAST) AND IS FORECAST TO MOVE NORTH OR
     NORTH-NORTHWEST AT ABOUT 10KNOTS ACROSS THE
     NORTHERN PART OF THE SOUTH CHINA SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  080/5-10
       OFFSHORE:  080/15                               27-33
   B.   2000 FT:  080/15                               25
   C.   5000 FT:  070/15                               21
   D.  10000 FT:  060/10                               12
   E.  18000 FT:  060/10                               MS1
   F.  24000 FT:  020/10                               MS11
   G.  30000 FT:  040/10                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY.  A FEW ISOLATED SHOWERS LATER
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 FT TEMPO FEW CB 800 FT
      SCT 1200 FT BKN 4000 FT
   K. VISIBILITY    : 10 KM.  TEMPO 4000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11800 FT
   M. TURBULENCE    : MOD OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 1.5-2.0 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTHEASTERLY WINDS, BECOMING FRESH
     NORTHWESTERLY WINDS, OCCASIONALLY STRONG
     OFFSHORE.  CLOUDY WITH A FEW SHOWERS AND SQUALLY
     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 04:00 HKT on 12 Jun 17

    VHHK SIGMET 3 VALID 111800/120000 VHHH- VHHK HONG KONG FIR TC MERBOK PSN N1924 E11600 CB FCST AT 1800Z WI 90NM OF TC CENTRE TOP FL450 NC FCST AT 0000Z TC CENTRE PSN N2030 E11548= VHHK SIGMET 6 VALID 111800/120000 VHHH- VHHK HONG KONG FIR TC MERBOK PSN N1906 E11554 CB OBS AT 1800Z WI 90NM OF TC CENTRE TOP FL450 NC FCST AT 0000Z TC CENTRE PSN N2042 E11536= VHHK SIGMET 8 VALID 112000/120000 VHHH- VHHK HONG KONG FIR TC MERBOK PSN N1912 E11548 CB OBS AT 1800Z WI 90NM OF TC CENTRE TOP FL450 NC FCST AT 0000Z TC CENTRE PSN N2006 E11518=

    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 03:45 HKT 12/Jun/2017

    Tropical Cyclone Warning Bulletin

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

    The Standby Signal, No. 1 is in force.

    This means that a tropical cyclone now centred within about 800 kilometres of Hong Kong may affect us.

    At 4 a.m., Tropical Storm Merbok was estimated to be about 350 kilometres south-southeast of Hong Kong (near 19.5 degrees north 115.7 degrees east) and is forecast to move north or north-northwest at about 20 kilometres per hour across the northern part of the South China Sea.
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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 04:00 HKT 12/Jun/2017


    Tropical Cyclone Warning

    At 111800 UTC, Tropical Storm Merbok (1702) with central pressure 994 hectopascals was centred within 60 nautical miles of one nine point two degrees north (19.2 N) one one five point eight degrees east (115.8 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 40 knots.

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

    Forecast position and intensity at 121800 UTC
    Two two point seven degrees north (22.7 N)
    One one four point four degrees east (114.4 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 131800 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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