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Bulletin issued at 10:41 HKT 12/Jun/2017

At 10 a.m. at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 77 per cent.
During the past hour the mean UV Index recorded at King's Park was 6. The intensity of UV radiation was high.

Please be reminded that:

The Tropical Cyclone Signal No. 3 was issued at 10:40 a.m.

The air temperatures at other places were:

King's Park 31 degrees;
Wong Chuk Hang 31 degrees;
Ta Kwu Ling 31 degrees;
Lau Fau Shan 29 degrees;
Tai Po 29 degrees;
Sha Tin 32 degrees;
Tuen Mun 31 degrees;
Tseung Kwan O 30 degrees;
Sai Kung 30 degrees;
Cheung Chau 31 degrees;
Chek Lap Kok 32 degrees;
Tsing Yi 31 degrees;
Shek Kong 30 degrees;
Tsuen Wan Ho Koon 29 degrees;
Tsuen Wan Shing Mun Valley 31 degrees;
Hong Kong Park 31 degrees;
Shau Kei Wan 29 degrees;
Kowloon City 30 degrees;
Happy Valley 31 degrees;
Wong Tai Sin 29 degrees;
Stanley 30 degrees;
Kwun Tong 30 degrees;
Sham Shui Po 32 degrees;
Kai Tak Runway Park 30 degrees;
Yuen Long Park 30 degrees;
Tai Mei Tuk 30 degrees.

Between 8:45 and 9:45 a.m., the rainfall recorded in various regions were:

Yuen Long 0 to 4 mm;
Islands District 0 to 2 mm;
Tai Po 0 to 1 mm.

Here is the information on Tropical Storm Merbok:
Location: 20.5 degrees north, 115.2 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 09:45 HKT 12/Jun/2017

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

Weather forecast for today

Mainly cloudy with occasional squally showers. Showers will be heavy tonight. Fresh easterly winds at first, becoming northerlies and winds will strengthen. There will be swells.

Outlook : Occasional heavy squally showers at first tomorrow. 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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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.


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    • SOUTH CHINA COASTAL WATERS
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    Bulletin issued at 09:30 HKT 12/Jun/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.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 9 a.m., Tropical Storm Merbok with maximum sustained winds of about 75 kilometres per hour near its centre was located at 20.3 degrees north, 115.2 degrees east, it is forecast to move north-northwest at about 20 kilometres per hour towards the coast of Guangdong.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 5 to 6, becoming north force 6 to 7, occasionally force 8.
    Occasional squally showers and thunderstorms, heavy at times later.
    Rough seas, becoming very rough seas.

    Nan'ao:
    Southeast force 6 to 7.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Shanwei:
    Cyclonic force 7 to 8, becoming southwest force 6 to 7 later.
    Frequent heavy squally showers and thunderstorms.
    Very rough to high seas.

    South of Hong Kong:
    East force 6 to 7, becoming cyclonic force 8.
    Frequent heavy squally showers and thunderstorms.
    Rough seas, becoming very rough seas.

    Shangchuan Dao:
    South to southwest force 5 to 6.
    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-northeast force 5
      Visibility 17 Kilometres

    Shantou Wind east force 3
      Visibility 30 Kilometres

    Dongsha Wind south-southeast force 5
      Visibility 10 Kilometres

    Huangmaozhou Wind east-northeast force 6

    Macau Wind north-northeast force 3
      Visibility 28 Kilometres

    Xisha Wind southwest force 4
      Visibility 21 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 09:30 HKT 12/JUN/2017
    (Next update at 17:30 HKT 12/JUN/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB. 
     ISOL CUNIM AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 9 A.M., TROPICAL STORM MERBOK WAS CENTRED AT
     20.3 DEGREES NORTH, 115.2 DEGREES EAST, IT IS
     FORECAST TO MOVE NORTH-NORTHWEST AT ABOUT 10
     KNOTS TOWARDS THE COAST OF GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  060/20-25
                  BEC 340/20-25
                  TEMPO VRB/30G35 IN TS
       OFFSHORE:  060/25-30
                  BEC 340/25-30, OCNL 35               30-33
   B.   2000 FT:  080/25-30
                  BEC 030/30-35                        24
   C.   5000 FT:  090/25-30, OCNL 40                   20
   D.  10000 FT:  090/25-35, 40-50 LATER               11
   E.  18000 FT:  070/25-30, 40 LATER                  0
   F.  24000 FT:  040/15
                  BEC 070/35-45                        MS11
   G.  30000 FT:  020/15
                  BEC 060/35                           MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH SQUALLY SHOWERS AND ISOLATED
      THUNDERSTORM.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT  SCT 3500 FT. 
      TEMPO FEW CB 800 FT SCT 1200 FT BKN 4000 FT
   K. VISIBILITY    : 9 KM.  TEMPO 4000 M IN SHOWERS. 
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 18000 FT      10 DEG. C LEVEL(S) : 10800 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 3.0-5.5 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     STRONG NORTHERLY WINDS, BECOMING FRESH TO STRONG
     SOUTHWESTERLY WINDS.  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 09:30 HKT on 12 Jun 17

    VHHK SIGMET 1 VALID 120130/120600 VHHH- VHHK HONG KONG FIR TC MERBOK PSN N2012 E11512 CB OBS AT 0000Z WI 150NM OF TC CENTRE TOP FL450 NC FCST AT 0600Z TC CENTRE PSN N2106 E11448= VHHK SIGMET 9 VALID 112230/120300 VHHH- VHHK HONG KONG FIR TC MERBOK PSN N1942 E11530 CB OBS AT 2100Z WI 150NM OF TC CENTRE TOP FL450 NC FCST AT 0300Z TC CENTRE PSN N2036 E11506=

    Please click here for more about the SIGMET

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    Tropical Cyclone Warnings

    Bulletin issued at 10:40 HKT 12/Jun/2017

    The No. 3 Strong Wind Signal has been issued at 10:40 a.m. to replace the No. 1 Standby Signal.
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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 09:40 HKT 12/Jun/2017


    Tropical Cyclone Warning

    At 120000 UTC, Tropical Storm Merbok (1702) with central pressure 994 hectopascals was centred within 60 nautical miles of two zero point two degrees north (20.2 N) one one five point two degrees east (115.2 E) and is forecast to move 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 130000 UTC
    Two three point five degrees north (23.5 N)
    One one four point four degrees east (114.4 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 140000 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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