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Bulletin issued at 11:11 HKT 13/Jun/2017

At 11 a.m. at the Hong Kong Observatory the air temperature was 25 degrees Celsius and the relative humidity 93 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.4. The intensity of UV radiation was low.

Please be reminded that:

The Red Rainstorm Warning Signal has been issued.
The Thunderstorm Warning has been issued. It will remain effective until 1:30 p.m. today. Isolated thunderstorms are expected to occur over Hong Kong.
The Landslip Warning has been issued.
The Special Announcement of Flooding in Northern New Territories has been issued.

The air temperatures at other places were:

King's Park 25 degrees;
Wong Chuk Hang 24 degrees;
Ta Kwu Ling 25 degrees;
Lau Fau Shan 25 degrees;
Tai Po 24 degrees;
Sha Tin 25 degrees;
Tuen Mun 25 degrees;
Tseung Kwan O 25 degrees;
Sai Kung 25 degrees;
Cheung Chau 24 degrees;
Chek Lap Kok 26 degrees;
Tsing Yi 25 degrees;
Shek Kong 25 degrees;
Tsuen Wan Ho Koon 24 degrees;
Tsuen Wan Shing Mun Valley 25 degrees;
Hong Kong Park 24 degrees;
Shau Kei Wan 26 degrees;
Kowloon City 24 degrees;
Happy Valley 25 degrees;
Wong Tai Sin 24 degrees;
Stanley 26 degrees;
Kwun Tong 25 degrees;
Sham Shui Po 25 degrees;
Kai Tak Runway Park 25 degrees;
Yuen Long Park 25 degrees;
Tai Mei Tuk 24 degrees.

Between 9:45 and 10:45 a.m., lightning was detected over all regions. The rainfall recorded in various regions were:

Tuen Mun 7 to 57 mm;
Yuen Long 13 to 38 mm;
Islands District 4 to 30 mm;
Southern District 16 to 24 mm;
North District 1 to 23 mm;
Tai Po 11 to 22 mm;
Central & Western District 8 to 18 mm;
Wan Chai 16 to 17 mm;
Tsuen Wan 3 to 16 mm;
Eastern District 12 to 16 mm;
Yau Tsim Mong 11 to 15 mm;
Kwun Tong 12 to 14 mm;
Wong Tai Sin 9 to 13 mm;
Kowloon City 12 to 13 mm;
Sha Tin 10 to 12 mm;
Sai Kung 7 to 11 mm;
Kwai Tsing 5 to 10 mm;
Sham Shui Po 7 to 10 mm.

Here is the information on Tropical Storm Merbok:
Location: 24.3 degrees north, 115.1 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 13 Jun

Regional Weather in Hong Kong

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Bulletin updated at 11:15 HKT 13/Jun/2017

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

A southwesterly airstream is affecting the coast of Guangdong. Meanwhile, rainbands associated with Tropical Storm Merbok continue to affect Guangdong.

At 11 a.m., Tropical Storm Merbok was centred about 240 kilometres north-northeast of Hong Kong and is forecast to move north-northeast at about 18 kilometres per hour across Guangdong and weaken gradually.

Weather forecast for today

Cloudy with heavy squally showers and a few thunderstorms. Showers will ease off later. There will be swells. Moderate to fresh southwesterly winds, occasionally strong offshore and on high ground.

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


(The above forecast period is valid up to 23:59 HKT today, 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 13/Jun/2017

GALE WARNING AREAS: HONG KONG AND KWANGTUNG.

GENERAL SITUATION AT 122100 UTC:
FOR DETAILS ON TROPICAL STORM MERBOK (1702), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 130100 UTC:

HONG KONG= SW 6-7, OCNL 8 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL SW 2 M. TEMP 29-28 C. =
KWANGTUNG= S TO SW 6-7, OCNL 8 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL SW 2-3 M. =
TAIWAN STRAIT= S TO SW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 2 M. =
BASHI= S TO SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL SW UP TO 2 M. =
PRATAS= S TO SW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 2 M. =
BALINTANG= S TO SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL SW UP TO 2 M. =
SCARBOROUGH= S TO SW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW UP TO 2 M. =
PARACEL= S TO SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW UP TO 2 M. =
TONKIN= S TO SW 5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2 M. =
DANANG= S TO SW 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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    South China Coastal Waters

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    Bulletin issued at 11:20 HKT 13/Jun/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:20 a.m. on 13 June 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    A southwest airstream is affecting the south China coastal waters.

    At 11 a.m., Tropical Storm Merbok with maximum sustained winds of about 65 kilometres per hour near its centre was located at 24.3 degrees north, 115.1 degrees east. It is forecast to move north-northeast at about 18 kilometres per hour across Guangdong and weaken gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Southwest force 6 to 7.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Nan'ao, Shanwei and South of Hong Kong:
    South to southwest force 6 to 7.
    Frequent heavy squally showers and thunderstorms.
    Rough to 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 5 to 6. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind variable force 2 with gusts to force 5
      Visibility 570 Metres

    Shantou Wind south-southeast force 3
      Visibility 18 Kilometres in showers

    Dongsha Wind south force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind southwest force 4

    Macau Wind north-northwest force 1
      Visibility 15 Kilometres

    Xisha Wind south-southwest force 4
      Visibility 14 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 13/JUN/2017
    (Next update at 17:30 HKT 13/JUN/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS, SEV TURB AND SEV GUSTS.  
     GALE FORCE WINDS OFFSHORE AND ON HIGH GROUND.
     CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 9 A.M., TROPICAL STORM MERBOK WAS CENTRED
     NEAR 24.2 DEGREES NORTH 114.9 DEGREES EAST AND
     IS FORECAST TO MOVE NORTH OR NORTH-NORTHEAST AT
     ABOUT 10 KNOTS ACROSS GUANGDONG AND WEAKEN
     GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  220/15-20G30
                  TEMPO VRB/25G35 IN TS
       OFFSHORE:  220/25, OCNL 35G45                   25-29
   B.   2000 FT:  260/25-35G45
                  BEC 230/20-25                        22
   C.   5000 FT:  260/35
                  BEC 230/20                           19
   D.  10000 FT:  250/35
                  BEC 220/25                           12
   E.  18000 FT:  300/20                               0
   F.  24000 FT:  320/20                               MS9
   G.  30000 FT:  030/15                               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 1000 FT  SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 8 KM.  TEMPO 3000 M IN SHOWERS.  
                      TEMPO 1500 M IN TS.
   L. 0 DEG. C LEVEL: 18000 FT      10 DEG. C LEVEL(S) : 11200 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 5.5-7.5 M     SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH SOUTHWESTERLY WINDS,
     OCCASIONALLY STRONG OFFSHORE AND ON HIGH GROUND.
     CLOUDY WITH A FEW SHOWERS AND ISOLATED
     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 11:25 HKT on 13 Jun 17

    VHHK SIGMET 1 VALID 130330/130730 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2200 E11236 - N2230 E11342 - N2336 E11718 - N2154 E11648 - N2018 E11500 - N2018 E11336 - N2200 E11236 TOP FL420 MOV NE 10KT NC= VHHK SIGMET 13 VALID 122330/130330 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2200 E11242 - N2230 E11342 - N2324 E11630 - N2148 E11648 - N2000 E11454 - N2000 E11242 - N2200 E11242 TOP FL380 MOV N 10KT NC=

    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 11:15 HKT 13/Jun/2017

    Tropical Cyclone Warning Bulletin

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

    All signals were cancelled at 11:10 a.m.

    At 11 a.m., Tropical Storm Merbok was centred about 240 kilometres north-northeast of Hong Kong (near 24.3 degrees north 115.1 degrees east) and is forecast to move north-northeast at about 18 kilometres per hour across Guangdong and weaken gradually.

    With Merbok weakening and moving away from Hong Kong, local winds moderated gradually. A southwesterly airstream is prevailing over the coast of Guangdong. There will still be occasional strong winds in some areas of the territory and swells over the sea at first. Members of the public should remain on the alert.
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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 09:30 HKT 13/Jun/2017


    Tropical Cyclone Warning

    At 130000 UTC, Tropical Storm Merbok (1702) with central pressure 994 hectopascals was centred within 60 nautical miles of two four point zero degrees north (24.0 N) one one four point eight degrees east (114.8 E) and is forecast to move north-northeast at about 10 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 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 13/Jun/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     30.0 C
Minimum Air Temperature                     25.3 C
Grass Minimum Temperature                   25.1 C
Relative Humidity                        76 - 98 Percent
Rainfall                                    37.7 mm 
Total rainfall since 1st January           576.9 mm
Against an average of                      829.1 mm

Other Stations                Min                  Max
King's Park                  25.0 C               30.9 C
Wong Chuk Hang               25.1 C               30.5 C
Ta Kwu Ling                  25.0 C               31.9 C
Lau Fau Shan                 25.2 C               30.3 C
Tai Po                       24.8 C               29.5 C
Sha Tin                      25.9 C               31.6 C
Tuen Mun                     25.4 C               32.0 C
Tseung Kwan O                25.1 C               31.1 C
Sai Kung                     25.4 C               30.5 C
Cheung Chau                  25.0 C               31.3 C
Chek Lap Kok                 26.1 C               32.9 C
Tsing Yi                     25.7 C               31.7 C
Shek Kong                    25.4 C               30.8 C
Tsuen Wan Ho Koon            24.5 C               29.5 C
Tsuen Wan Shing Mun Valley   24.8 C               30.8 C
Hong Kong Park               25.1 C               31.1 C
Shau Kei Wan                 24.7 C               30.3 C
Kowloon City                 24.9 C               30.8 C
Happy Valley                 25.7 C               31.6 C
Wong Tai Sin                 24.8 C               29.6 C
Stanley                      25.4 C               30.2 C
Kwun Tong                    25.0 C               30.6 C
Sham Shui Po                 25.7 C               31.8 C
Kai Tak Runway Park          25.7 C               30.5 C
Yuen Long Park               25.3 C               31.2 C
Tai Mei Tuk               24.7 C               31.1 C

Duration of sunshine (King's Park):              4.4 H
The mean UV index recorded at King's Park yesterday was 4,
the UV intensity was Moderate.
The maximum UV index for yesterday was 12.
Sea surface temperature (Waglan Island):        26.4 C 

Yesterday's (12 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                             0.09
Kat O                               0.09
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 12 Jun
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