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Bulletin issued at 05:02 HKT 12/Sep/2018

At 5 a.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 79 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.

The air temperatures at other places were:

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

Between 3:45 and 4:45 a.m., the rainfall recorded in various regions were:

Islands District 0 to 1 mm.

Here is the information on Tropical Storm Barijat:
Location: 20.6 degrees north, 116.0 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 Sep

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 04:45 HKT 12/Sep/2018

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

Weather forecast for today

Mainly cloudy. There will be occasional squally showers and thunderstorms. The maximum temperature will be about 30 degrees. Moderate northerly winds, strengthening gradually from the east later. There will be swells.

Outlook : Still windy with squally showers at first tomorrow. Sunny periods on Friday.


(The above forecast period is valid up to 23:59 HKT today, 12/09/2018; 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 21:00 HKT 11/Sep/2018

GALE WARNING AREAS: KWANGTUNG, BASHI, PRATAS AND PARACEL.

GENERAL SITUATION AT 110900 UTC:
FOR DETAILS ON THE TROPICAL STORM BARIJAT (1823), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 111300 UTC:

HONG KONG= N TO NE 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS LATER. SEA UP TO 3 M. SWELL NE 2 M. TEMP 26-30 C. =
KWANGTUNG= N TO NE 6-7, CYCLONIC 8-9 LATER. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, 6-8 M LATER. SWELL NE 2-3 M. =
TAIWAN STRAIT= NE 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL N TO NE 2 M. =
BASHI= E TO SE 6-7, OCNL 8. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL NE 2-3 M. =
PRATAS= CYCLONIC 8-9, SE 6-7 LATER. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, 3-4 M LATER. SWELL NE 2-3 M. =
BALINTANG= S TO SE 6-7, E 5-6 LATER. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, 2-3 M LATER. SWELL NE 2 M. =
SCARBOROUGH= S 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL NE UP TO 2 M. =
PARACEL= N TO NE 6-7, CYCLONIC 8-9 LATER. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, 6-8 M LATER. SWELL NE 2-3 M. =
TONKIN= E TO NE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= E TO NE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL NE 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
  • Tidal Information

    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 05:30 HKT 12/Sep/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 12 September 2018

    Warnings:
    Gale force winds in Nan'ao, Shanwei, south of Hong Kong and Shangchuan Dao. Strong winds in Hong Kong adjacent waters.

    Weather Situation:
    At 5 a.m., Tropical Storm Barijat with maximum sustained winds of about 65 kilometres per hour near its centre was located near 20.6 degrees north, 116.0 degrees east. It is forecast to move west at about 18 kilometres per hour in the general direction of the coast of western Guangdong.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North to northeast force 4 to 5, occasionally force 6.
    Occasional scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao:
    South to southeast force 7 to 8.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Shanwei:
    Cyclonic force 8 to 9.
    Frequent heavy squally showers and thunderstorms.
    Very rough seas.

    South of Hong Kong:
    North to northeast force 6 to 7, becoming cyclonic force 8 to 9.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Shangchuan Dao:
    North to northeast force 5 to 6, becoming cyclonic force 8 to 9.
    Scattered squally showers and thunderstorms.
    Rough to very rough seas.

    Outlook for the next 48 hours
    East to southeasterly winds of force 6 to 7, cyclonic winds of force 8 to 9 in west at first. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind north force 4
      Visibility 17 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 10 Kilometres in rain

    Dongsha Wind south-southeast force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind northeast force 4

    Macau Wind north force 2
      Visibility 15 Kilometres

    Xisha Wind calm
      Visibility 9 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 01:30 HKT 12/SEP/2018
    (Next update at 9:00-9:30 HKT 12/SEP/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 11 P.M. LAST NIGHT. TROPICAL STORM BARIJAT
     WAS CENTRED NEAR 20.6 DEGREES NORTH 117.0
     DEGREES EAST AND IS FORECAST TO MOVE WEST AT
     ABOUT 8 KNOTS IN THE GENERAL DIRECTION OF THE
     COAST OF WESTERN GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  040/10-15
       OFFSHORE:  040/20-25                            25-31
   B.   2000 FT:  060/20-25                            23
   C.   5000 FT:  040/20                               17
   D.  10000 FT:  050/20                               13
   E.  18000 FT:  040/20                               0
   F.  24000 FT:  070/30                               MS12
   G.  30000 FT:  070/30                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT.
   K. VISIBILITY    : 7 KM.
   L. 0 DEG. C LEVEL: 18000 FT      10 DEG. C LEVEL(S) : 12000 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND  NEAR HILLS
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     FRESH NORTHEASTERLY WINDS, OCCASIONALLY STRONG
     LATER.  MAINLY CLOUDY. THERE WILL BE SQUALLY
     SHOWERS AND THUNDERSTORMS 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.

    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 03:06 HKT on 12 Sep 18

    VHHK SIGMET 14 VALID 111605/112100 VHHH- VHHK HONG KONG FIR TC BARIJAT PSN N2036 E11700 CB OBS AT 1500Z WI 150NM OF TC CENTRE TOP FL500 INTSF FCST AT 2100Z TC CENTRE PSN N2036 E11606= VHHK SIGMET 16 VALID 111910/120000 VHHH- VHHK HONG KONG FIR TC BARIJAT PSN N2036 E11630 CB OBS AT 1800Z WI 150NM OF TC CENTRE TOP FL500 NC FCST AT 0000Z TC CENTRE PSN N2036 E11530=

    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 04:45 HKT 12/Sep/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 5 a.m., Tropical Storm Barijat was estimated to be about 270 kilometres southeast of Hong Kong (near 20.6 degrees north 116.0 degrees east) and is forecast to move west at about 18 kilometres per hour in the general direction of the coast of western Guangdong.

    Local winds are currently from the north and rather weak. According to the present forecast track, Barijat is expected to skirt around 100 to 200 kilometres south of Hong Kong later this afternoon. As Barijat edges closer to the Pearl River Delta, local winds will turn to easterlies and strengthen gradually during the day with occasional squally showers. The Observatory will take into account the variation of local wind strength in considering the issuance of the Strong Wind Signal, No.3 after 10 a.m.

    (Precautionary Announcements with No. 1 Signal)

    1. Precautions should be taken. Windows and doors should be checked.

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

    3. Those who have duties during a tropical cyclone should now remain on call.

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

    5. 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 03:30 HKT 12/Sep/2018


    Tropical Cyclone Warning

    At 111800 UTC, the tropical storm Barijat (1823) with central pressure 994 hectopascals was centred within 90 nautical miles of two zero point six degrees north (20.6 N) one one six point five degrees east (116.5 E) and is forecast to move west 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 90 nautical miles.

    Forecast position and intensity at 121800 UTC
    Two zero point nine degrees north (20.9 N)
    One one two point five degrees east (112.5 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 131800 UTC
    Two one point four degrees north (21.4 N)
    One zero seven point five degrees east (107.5 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 141800 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/Sep/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     32.7 C
Minimum Air Temperature                     25.2 C
Grass Minimum Temperature                   24.3 C
Relative Humidity                        48 - 88 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          1673.7 mm
Against an average of                     2031.2 mm

Other Stations                Min                  Max
King's Park                  24.7 C               32.5 C
Wong Chuk Hang               22.9 C               31.1 C
Ta Kwu Ling                  21.8 C               33.0 C
Lau Fau Shan                 23.6 C               31.3 C
Tai Po                       23.7 C               31.8 C
Sha Tin                      22.9 C               32.6 C
Tuen Mun                     24.0 C               32.0 C
Tseung Kwan O                22.3 C               32.7 C
Sai Kung                     24.2 C               31.1 C
Cheung Chau                  23.8 C               32.4 C
Chek Lap Kok                 25.5 C               32.3 C
Tsing Yi                     23.9 C               32.7 C
Shek Kong                    22.3 C               33.5 C
Tsuen Wan Ho Koon            22.4 C               30.8 C
Tsuen Wan Shing Mun Valley   22.2 C               33.3 C
Hong Kong Park               24.1 C               32.4 C
Shau Kei Wan                 25.0 C               31.9 C
Kowloon City                 25.0 C               32.9 C
Happy Valley                 23.2 C               34.3 C
Wong Tai Sin                 24.1 C               33.8 C
Stanley                      23.9 C               31.4 C
Kwun Tong                    24.9 C               33.1 C
Sham Shui Po                 23.6 C               33.6 C
Kai Tak Runway Park          25.3 C               32.4 C
Yuen Long Park               22.5 C               33.2 C
Tai Mei Tuk               24.1 C               32.7 C

Duration of sunshine (King's Park):              11.0 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 9.
 

Yesterday's (11 Sep 2018) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 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                             0.09
Kat O                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.13
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 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 11 Sep
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