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Bulletin issued at 04:02 HKT 13/Jun/2017

At 4 a.m. at the Hong Kong Observatory the air temperature was 25 degrees Celsius and the relative humidity 97 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 8 has been issued.
The Amber Rainstorm Warning Signal has been issued.
The Thunderstorm Warning has been issued. It will remain effective until 6:00 a.m. today. Isolated thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 25 degrees;
Wong Chuk Hang 26 degrees;
Ta Kwu Ling 26 degrees;
Lau Fau Shan 27 degrees;
Tai Po 25 degrees;
Sha Tin 26 degrees;
Tuen Mun 26 degrees;
Tseung Kwan O 25 degrees;
Sai Kung 26 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 26 degrees;
Shek Kong 26 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 25 degrees;
Hong Kong Park 25 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 25 degrees;
Happy Valley 27 degrees;
Wong Tai Sin 25 degrees;
Stanley 26 degrees;
Kwun Tong 25 degrees;
Sham Shui Po 26 degrees;
Kai Tak Runway Park 26 degrees;
Yuen Long Park 26 degrees;
Tai Mei Tuk 25 degrees.

Between 2:45 and 3:45 a.m., lightning was detected within New Territories East. The rainfall recorded in various regions were:

North District 0 to 36 mm;
Wong Tai Sin 23 to 33 mm;
Central & Western District 15 to 31 mm;
Tsuen Wan 14 to 31 mm;
Sai Kung 15 to 29 mm;
Wan Chai 27 to 29 mm;
Yuen Long 5 to 27 mm;
Sha Tin 12 to 27 mm;
Tuen Mun 6 to 26 mm;
Eastern District 15 to 26 mm;
Tai Po 11 to 25 mm;
Kwun Tong 19 to 25 mm;
Kowloon City 18 to 25 mm;
Islands District 0 to 22 mm;
Yau Tsim Mong 18 to 21 mm;
Sham Shui Po 17 to 21 mm;
Kwai Tsing 15 to 21 mm;
Southern District 10 to 17 mm.

Here is the information on Tropical Storm Merbok:
Location: 23.2 degrees north, 114.6 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 13 Jun

Regional Weather in Hong Kong

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Bulletin updated at 03:45 HKT 13/Jun/2017

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

Weather forecast for today

Strong to gale southwesterly winds. Cloudy with heavy squally showers and a few thunderstorms. Seas will be very rough with swells. Temperatures will range between 25 and 30 degrees. Winds will moderate gradually and showers will ease off later.

Outlook : There will still be showers in the following 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 21:05 HKT 12/Jun/2017

STORM WARNING AREA: HONG KONG.
GALE WARNING AREAS: KWANGTUNG AND PRATAS.

GENERAL SITUATION AT 120900 UTC:
FOR DETAILS ON SEVERE TROPICAL STORM MERBOK (1702), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 121305 UTC:

HONG KONG= CYCLONIC 10, BEC SW 7-8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 9 M, BEC 4-6 M. SWELL SW 2 M. TEMP 25-30 C. =
KWANGTUNG= S TO SW 6-7, 8-9 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, 6-8 M AT FIRST. SWELL SW 2-3 M. =
TAIWAN STRAIT= S TO SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 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, OCNL 8. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 6 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, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL SW 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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    Bulletin issued at 03:30 HKT 13/Jun/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 13 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 3 a.m., Tropical Storm Merbok with maximum sustained winds of about 85 kilometres per hour near its centre was located at 23.0 degrees north, 114.6 degrees east, it is forecast to move north or north-northeast at about 18 kilometres per hour into inland Guangdong and weaken gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Southwest force 6 to 7, up to force 8 at first.
    Frequent heavy squally showers and thunderstorms.
    Very rough seas.

    Nan'ao:
    South to southwest force 5 to 6, occasionally force 7.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Shanwei and South of Hong Kong:
    South to southwest force 6 to 7, up to force 8 at first.
    Frequent heavy squally showers and thunderstorms.
    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 southwest force 7
      Visibility 1400 Metres

    Shantou Wind east-southeast force 2
      Visibility 30 Kilometres

    Huangmaozhou Wind west-southwest force 7

    Macau Wind west-northwest force 2
      Visibility 16 Kilometres

    Xisha Wind south-southwest force 4
      Visibility 17 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 01:30 HKT 13/JUN/2017
    (Next update at 9:00-9:30 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 1 A.M., TROPICAL STORM MERBOK WAS CENTRED
     NEAR 22.7 DEGREES NORTH 114.5 DEGREES EAST AND
     IS FORECAST TO MOVE NORTH AT ABOUT 10 KNOTS INTO
     INLAND GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  260/35-40G50
                  BEC 220/15-20G30
                  TEMPO VRB/35G45 IN TS                25-29
   B.   2000 FT:  260/35-40G50
                  BEC 230/15-20G30                     22
   C.   5000 FT:  260/35
                  BEC 230/25                           19
   D.  10000 FT:  240/35
                  BEC 220/25                           11
   E.  18000 FT:  180/30
                  BEC 220/20                           MS2
   F.  24000 FT:  160/25
                  BEC 220/20                           MS11
   G.  30000 FT:  090/20
                  BEC 150/15                           MS25
   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) : 11000 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.

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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 03:30 HKT on 13 Jun 17

    VHHK SIGMET 11 VALID 121530/121930 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2200 E11248 - N2230 E11342 - N2318 E11612 - N1942 E11606 - N1942 E11254 - N2200 E11248 TOP FL380 MOV N 10KT NC= VHHK SIGMET 12 VALID 121930/122330 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2200 E11248 - N2230 E11342 - N2318 E11612 - N1942 E11606 - N1942 E11254 - N2200 E11248 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 04:40 HKT 13/Jun/2017

    The No. 3 Strong Wind Signal has been issued at 4:40 a.m. to replace the No. 8 Southwest Gale or Storm Signal.
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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 03:30 HKT 13/Jun/2017


    Tropical Cyclone Warning

    At 121800 UTC, Tropical Storm Merbok (1702) with central pressure 988 hectopascals was centred within 60 nautical miles of two two point nine degrees north (22.9 N) one one four point six degrees east (114.6 E) and is forecast to move north or north-northeast 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 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 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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