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Bulletin issued at 12:02 HKT 10/Aug/2018

At noon at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 85 per cent.
During the past hour the mean UV Index recorded at King's Park was 5. The intensity of UV radiation was moderate.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.

The air temperatures at other places were:

King's Park 29 degrees;
Wong Chuk Hang 29 degrees;
Ta Kwu Ling 30 degrees;
Lau Fau Shan 28 degrees;
Tai Po 29 degrees;
Sha Tin 30 degrees;
Tuen Mun 28 degrees;
Tseung Kwan O 29 degrees;
Sai Kung 29 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 29 degrees;
Tsing Yi 29 degrees;
Tsuen Wan Ho Koon 27 degrees;
Tsuen Wan Shing Mun Valley 28 degrees;
Hong Kong Park 28 degrees;
Shau Kei Wan 28 degrees;
Kowloon City 29 degrees;
Happy Valley 30 degrees;
Wong Tai Sin 29 degrees;
Stanley 28 degrees;
Kwun Tong 29 degrees;
Sham Shui Po 29 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 29 degrees;
Tai Mei Tuk 29 degrees.

Between 10:45 and 11:45 a.m., the rainfall recorded in various regions were:

Yau Tsim Mong 0 to 1 mm.

10.9 millimetres of rainfall were recorded at the Hong Kong Observatory between midnight last night and midday today.

Here is the information on Tropical Depression:
Location: 19.7 degrees north, 111.3 degrees east; Maximum sustained wind near its centre: 45 km/h.


Note: The data above is provisional. Only limited data validation has been carried out.


Climatological Information for 10 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


Local Weather Forecast
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Bulletin updated at 11:45 HKT 10/Aug/2018

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

Weather forecast for this afternoon and tonight

Mainly cloudy with occasional squally showers and a few thunderstorms. Moderate to fresh east to southeasterly winds, occasionally strong offshore and on high ground.

Outlook : There will be occasional squally showers and thunderstorms over the weekend.


(The above forecast period is valid up to 23:59 HKT today, 10/08/2018; 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 10/Aug/2018

N0 WARNING.

GENERAL SITUATION AT 092100 UTC:
FOR DETAILS ON TROPICAL DEPRESSION OVER THE NORTHERN PARTS OF SOUTH CHINA SEA, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 100100 UTC:

HONG KONG= E TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E UP TO 2 M. TEMP 30-26 C. =
KWANGTUNG= E TO SE 5-6, BEC CYCLONIC 6-7 IN W. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M, BEC 3-4 M IN W. SWELL E 2 M. =
TAIWAN STRAIT= SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
BASHI= W TO SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL SW 2 M. =
PRATAS= S 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2 M. =
BALINTANG= W TO SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL SW 2 M. =
SCARBOROUGH= S TO SW 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL SW 2-3 M. =
PARACEL= CYCLONIC 6-7, BEC SW 6. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, BEC 3 M. SWELL S TO SW 2-3 M. =
TONKIN= W TO NW 4-5, OCNL 6. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 3 M. =
DANANG= W TO SW 5-6. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S 2-3 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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    South China Coastal Waters

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    Bulletin issued at 12:30 HKT 10/Aug/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 p.m. on 10 August 2018

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    At noon, the tropical depression over the northern part of the South China Sea with maximum sustained winds of about 45 kilometres per hour near its centre was located near 19.7 degrees north, 111.3 degrees east. It is forecast to move north at about 10 kilometres per hour in the general direction towards the vicinity of the coast of western Guangdong to Hainan Island.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to southeast force 5 to 6.
    Occasional squally showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao and Shanwei:
    East to southeast force 5 to 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    South of Hong Kong:
    East to southeast force 5 to 6.
    Occasional squally showers and thunderstorms.
    Moderate to rough seas.

    Shangchuan Dao:
    South to southwest force 6 to 7.
    Frequent heavy squally showers and thunderstorms.
    Rough seas.

    Outlook for the next 48 hours
    South to southeasterly winds of force 6 to 7, force 5 later. Occasional squally showers and thunderstorms.

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

    Waglan Island Wind east force 4
      Visibility 22 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 16 Kilometres in showers

    Dongsha Wind south-southwest force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind east-southeast force 4

    Macau Wind east force 3
      Visibility 8 Kilometres in rain

    Xisha Wind southwest force 4
      Visibility 12 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
  • Descriptive Terms of Wind Speeds
  • Visibility Readings in Hong Kong Waters
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 12:30 HKT 10/AUG/2018
    (Next update at 17:30 HKT 10/AUG/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT NOON, THE TROPICAL DEPRESSION OVER THE
     NORTHERN PART OF THE SOUTH CHINA SEA WAS CENTRED
     NEAR 19.7 DEGREES NORTH 111.3 DEGREES EAST AND
     IS FORECAST TO MOVE NORTH AT ABOUT 5 KNOTS IN
     THE GENERAL DIRECTION TOWARDS THE VICINITY OF
     THE COAST OF WESTERN GUANGDONG TO HAINAN ISLAND.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1300 TO 2300 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  100/15, OCNL 20
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  110/25-30                            30-26
   B.   2000 FT:  110/25, OCNL 30                      23
   C.   5000 FT:  120/20-25                            19
   D.  10000 FT:  160/20                               13
   E.  18000 FT:  120/20                               MS1
   F.  24000 FT:  130/20                               MS11
   G.  30000 FT:  130/20                               MS22
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH OCCASIONAL SQUALLY SHOWERS AND
      ISOLATED THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT  SCT 3500 FT.  
      TEMPO FEW CB 1000 FT  SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 10 KM.  TEMPO 3500 M IN SHOWERS.  
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11400 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 4.0-5.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     FRESH EAST TO SOUTHEASTERLY WINDS, STRONG
     OFFSHORE AND ON HIGH GROUND.  CLOUDY WITH
     OCCASIONAL SQUALLY 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 08:40 HKT on 10 Aug 18

    VHHK SIGMET 1 VALID 100050/100450 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF LINE N1942 E11624 - N1812 E11242 TOP FL420 MOV NW 10KT NC= VHHK SIGMET 6 VALID 092050/100050 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF N1850 TOP FL420 MOV NW 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 11:45 HKT 10/Aug/2018

    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 noon, the tropical depression over the northern part of the South China Sea was estimated to be about 420 kilometres southwest of Hong Kong (near 19.7 degrees north 111.3 degrees east) and is forecast to move north at about 10 kilometres per hour in the general direction towards the vicinity of the coast of western Guangdong to Hainan Island.

    According to the present forecast track, the chance of strong winds generally over the territory is not high for most of the day today. The chance of issuing the Strong Wind Signal, No. 3 during daytime is relatively low.

    Under the influence of the outer rain bands of the tropical depression, there will be occasional squally showers in Hong Kong today and over the weekend.

    (Precautionary Announcements with No. 1 Signal)

    1. Every precaution should be taken. Objects likely to be blown away should be secured or taken indoors. Check if all windows and doors can be securely locked.

    2. Drains should be cleared of leaves and rubbish. People in low-lying areas should take precautions against flooding.

    3. People planning to visit Guangdong, Macau, outlying islands or remote parts of Hong Kong should note that changes in weather may affect your trips.

    4. There may be swells, you are advised to stay away from the shoreline.

    5. Construction and property management practitioners should make sure that overhanging facilities and temporary structures outdoors are securely fastened, and should take precautionary measures.

    6. Listen to radio, watch TV or browse the Hong Kong Observatory's website and mobile app for the latest information on the tropical cyclone.
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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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    Severe Weather Information Centre

    Bulletin issued at 12:30 HKT 10/Aug/2018


    Tropical Cyclone Warning

    At 100300 UTC, the tropical depression over the northern part of South China Sea with central pressure 998 hectopascals was centred within 90 nautical miles of one nine point six degrees north (19.6 N) one one one point four degrees east (111.4 E) and is forecast to move north at about 5 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 25 knots.

    Radius of over 2 metre waves 90 nautical miles.

    Forecast position and intensity at 110300 UTC
    Two zero point eight degrees north (20.8 N)
    One one one point zero degrees east (111.0 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 120300 UTC
    Two one point three degrees north (21.3 N)
    One one zero point nine degrees east (110.9 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 130300 UTC
    Two one point three degrees north (21.3 N)
    One one zero point zero degrees east (110.0 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 140300 UTC
    Two one point one degrees north (21.1 N)
    One zero eight point zero degrees east (108.0 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 150300 UTC
    Two zero point four degrees north (20.4 N)
    One zero four point eight degrees east (104.8 E)
    Maximum winds 25 knots.



    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 10/Aug/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     33.6 C
Minimum Air Temperature                     29.2 C
Grass Minimum Temperature                   27.4 C
Relative Humidity                        60 - 82 Percent
Rainfall                                      Trace 
Total rainfall since 1st January           989.7 mm
Against an average of                     1584.4 mm

Other Stations                Min                  Max
King's Park                  28.3 C               32.7 C
Wong Chuk Hang               28.5 C               33.0 C
Ta Kwu Ling                  26.3 C               34.7 C
Lau Fau Shan                 26.5 C               33.4 C
Tai Po                       28.3 C               31.9 C
Sha Tin                      28.5 C               33.1 C
Tuen Mun                     27.5 C               32.9 C
Tseung Kwan O                27.9 C               33.1 C
Sai Kung                     28.8 C               31.5 C
Cheung Chau                  28.1 C               31.9 C
Chek Lap Kok                 29.0 C               35.9 C
Tsing Yi                     28.9 C               33.5 C
Tsuen Wan Ho Koon            26.1 C               32.3 C
Tsuen Wan Shing Mun Valley   27.8 C               32.4 C
Hong Kong Park               28.2 C               32.9 C
Shau Kei Wan                 28.0 C               31.1 C
Kowloon City                 28.1 C               32.8 C
Happy Valley                 28.8 C               33.3 C
Wong Tai Sin                 28.3 C               32.6 C
Stanley                      27.9 C               32.3 C
Kwun Tong                    27.9 C               32.1 C
Sham Shui Po                 28.5 C               34.2 C
Kai Tak Runway Park          28.6 C               31.7 C
Yuen Long Park               27.3 C               33.9 C
Tai Mei Tuk               26.5 C               32.6 C

Duration of sunshine (King's Park):              7.8 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 12.
 

Yesterday's (09 Aug 2018) 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                           0.09
Tap Mun                             0.08
Kat O                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.11
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.08
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 in the
past, the hourly mean ambient gamma radiation dose rate may
vary between 0.06 and 0.3 microsievert per hour. (1
microsievert = 0.000001 sievert = 0.001 millisievert)

    2. Temporal variations are generally caused by changes in
meteorological conditions such as rainfall, wind and
barometric pressure.

    3. Spatial variations are generally caused by differences in
the radioactive content of local rock and soil.

    4. The data displayed is provisional. Only limited data
validation has been carried out.
    Climatological Information for 09 Aug
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