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Bulletin issued at 00:02 HKT 12/Jun/2017

At midnight at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 83 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 29 degrees;
Ta Kwu Ling 27 degrees;
Lau Fau Shan 28 degrees;
Tai Po 29 degrees;
Sha Tin 29 degrees;
Tuen Mun 28 degrees;
Tseung Kwan O 29 degrees;
Sai Kung 29 degrees;
Cheung Chau 28 degrees;
Chek Lap Kok 30 degrees;
Tsing Yi 30 degrees;
Shek Kong 28 degrees;
Tsuen Wan Ho Koon 26 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 29 degrees;
Shau Kei Wan 29 degrees;
Kowloon City 29 degrees;
Happy Valley 29 degrees;
Wong Tai Sin 29 degrees;
Stanley 29 degrees;
Kwun Tong 29 degrees;
Sham Shui Po 29 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 28 degrees;
Tai Mei Tuk 28 degrees.

Here is the information on Tropical Storm Merbok:
Location: 18.8 degrees north, 116.1 degrees east; Maximum sustained wind near its centre: 65 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 00:05 HKT 12/Jun/2017

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

The subtropical ridge continued to bring generally fine weather to southeastern China yesterday. Locally, it was mainly fine apart from isolated showers. The weather was very hot during the day. The maximum temperature recorded at the Observatory was 34.1 degrees in the afternoon, the highest so far this year. Besides, the area of low pressure over the South China Sea intensified into a tropical storm yesterday, and was named Merbok. Merbok is forecast to move north or north-northwest across the northern part of the South China Sea, and make landfall over Guangdong between Monday night and Tuesday morning.

Weather forecast for Hong Kong (Monday, 12 Jun 2017)

A few showers. Becoming cloudy. More showery with squally thunderstorms later. Temperatures will range between 28 and 33 degrees. Light 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 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 21:00 HKT 11/Jun/2017

GALE WARNING AREAS: KWANGTUNG, BASHI, PRATAS, BALINTANG AND SCARBOROUGH.

GENERAL SITUATION AT 110900 UTC:
FOR DETAILS ON TROPICAL STORM MERBOK (1702), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 111300 UTC:

HONG KONG= SE 4-5, NW 6 LATER. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA UP TO 2 M, BEC 3 M LATER. TEMP 28-33 C. =
KWANGTUNG= SE 5-6, BEC CYCLONIC 8-9 IN E. ISOL SQUALLY SHOWERS AND TS. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS IN E LATER. SEA 2-3 M, BEC 6-8 M. SWELL SE 2-3 M LATER. =
TAIWAN STRAIT= S TO SW 4-5, BEC SE 6-7. ISOL SHOWERS AND TS. SEA 2 M, BEC 3-4 M. =
BASHI= S 5-6, BEC 7-8 IN W. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, BEC 4-6 M. SWELL SE UP TO 2 M. =
PRATAS= CYCLONIC 8-9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M. SWELL SE 2-3 M. =
BALINTANG= S 6-7, OCNL 8 IN W. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL SE 2 M. =
SCARBOROUGH= S 6-7, OCNL 8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL SE 2-3 M. =
PARACEL= S TO SW 4-5, 6-7 IN E LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M, 3-4 M IN E LATER. SWELL SE 2 M. =
TONKIN= S 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= S 4-5. ISOL SHOWERS AND TS. SEA UP TO 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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    Bulletin issued at 23:30 HKT 11/Jun/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 11 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 11 p.m., Tropical Storm Merbok with maximum sustained winds of about 65 kilometres per hour near its centre was located at 18.4 degrees north, 116.2 degrees east, it is forecast to move north at about 20 kilometres per hour across 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-southeast force 3
      Visibility 27 Kilometres

    Shantou Wind south-southeast force 2
      Visibility 30 Kilometres

    Dongsha Wind southeast force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 4

    Macau Wind east-southeast force 1
      Visibility 40 Kilometres

    Xisha Wind northwest force 1
      Visibility 30 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 11/JUN/2017
    (Next update at 01:30 HKT 12/JUN/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE SUBTROPICAL RIDGE IS BRINGING GENERALLY FINE
     WEATHER TO SOUTHEASTERN CHINA.
     AT 4 P.M., TROPICAL DEPRESSION MERBOK WAS
     CENTRED NEAR 17.4 DEGREES NORTH, 116.6 DEGREES
     EAST.  IT IS FORECAST TO MOVE NORTH AT ABOUT 10
     KNOTS ENTERING THE NORTHERN PART OF THE SOUTH
     CHINA SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  140/5-10
       OFFSHORE:  140/15                               31-28
   B.   2000 FT:  140/15                               24
   C.   5000 FT:  100/10                               20
   D.  10000 FT:  090/10                               12
   E.  18000 FT:  070/10                               MS2
   F.  24000 FT:  020/10                               MS12
   G.  30000 FT:  040/10                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE, BECOMING CLOUDY.  A FEW SHOWERS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 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 SOUTHEASTERLY 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.

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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 00:30 HKT on 12 Jun 17

    VHHK SIGMET 4 VALID 111230/111630 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2018 E11654 - N1642 E11400 - N1742 E11306 - N2012 E11442 - N2018 E11654 TOP FL380 MOV W 10KT NC= VHHK SIGMET 5 VALID 111630/112030 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2054 E11730 - N1642 E11400 - N1736 E11312 - N1924 E11418 - N2030 E11542 - N2054 E11730 TOP FL380 MOV N 10KT NC= 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=

    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 23:45 HKT 11/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 midnight, Tropical Storm Merbok was estimated to be about 440 kilometres south-southeast of Hong Kong (near 18.8 degrees north 116.1 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

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    Bulletin issued at 00:30 HKT 12/Jun/2017


    Tropical Cyclone Warning

    At 111500 UTC, Tropical Storm Merbok (1702) with central pressure 994 hectopascals was centred within 60 nautical miles of one eight point six degrees north (18.6 N) one one six point one degrees east (116.1 E) and is forecast to move north or north-northeast at about 12 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 35 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 121500 UTC
    Two three point one degrees north (23.1 N)
    One one five point two degrees east (115.2 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 131500 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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