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Bulletin issued at 21:02 HKT 12/Sep/2018

At 9 p.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 82 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 3 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 27 degrees;
Tai Po 27 degrees;
Sha Tin 28 degrees;
Tuen Mun 28 degrees;
Tseung Kwan O 27 degrees;
Sai Kung 27 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 27 degrees;
Shek Kong 27 degrees;
Tsuen Wan Ho Koon 26 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 27 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 27 degrees;
Happy Valley 28 degrees;
Wong Tai Sin 27 degrees;
Stanley 26 degrees;
Kwun Tong 27 degrees;
Sham Shui Po 26 degrees;
Kai Tak Runway Park 27 degrees;
Yuen Long Park 27 degrees;
Tai Mei Tuk 27 degrees.

Between 7:45 and 8:45 p.m., the rainfall recorded in various regions were:

Yuen Long 0 to 1 mm;
Central & Western District 0 to 1 mm;
Kwai Tsing 0 to 1 mm;
Sham Shui Po 1 mm.

Here is the information on Tropical Storm Barijat:
Location: 20.9 degrees north, 113.4 degrees east; Maximum sustained wind near its centre: 85 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 20:45 HKT 12/Sep/2018

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

Weather forecast for tonight and tomorrow

Strong easterly winds, occasionally gale offshore, becoming southeasterlies tonight, moderating gradually later tomorrow. Mainly cloudy with a few squally showers. Showers will be more frequent with thunderstorms at first tomorrow. Temperatures will range between 26 and 30 degrees. Seas will be rough with swells.

Outlook : Very hot on Friday and Saturday. Weather will deteriorate significantly with frequent heavy rain and squalls on Sunday. Seas will be very rough with swells.


(The above forecast period is valid up to 23:59 HKT tomorrow, 13/09/2018; 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 12/Sep/2018

GALE WARNING AREAS: HONG KONG, KWANGTUNG, PARACEL AND TONKIN.

GENERAL SITUATION AT 120900 UTC:
FOR DETAILS ON TROPICAL STORM BARIJAT (1823), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 121300 UTC:

HONG KONG= E 7-8, BEC SE 7-8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL E 2 M. TEMP 26-30 C. =
KWANGTUNG= CYCLONIC 8-9, SE 7-8 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, 4-6 M LATER. SWELL E TO NE 3 M. =
TAIWAN STRAIT= NE 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL NE 2 M. =
BASHI= E TO NE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E 2-3 M. =
PRATAS= E 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E 2-3 M. =
BALINTANG= E TO NE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E 2-3 M. =
SCARBOROUGH= E TO NE 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL NE UP TO 2 M. =
PARACEL= SW 6-7, UP TO 8-9 IN N. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, 6-8 M IN N. SWELL NE 2-3 M. =
TONKIN= NE 6, CYCLONIC 8-9 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3 M, 6-8 M LATER. =
DANANG= E TO NE 4-5, BEC SW 5-6. DOWN TO 1000 M IN SQUALLY SHOWERS AND TS. SEA UP TO 2 M, BEC 3 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
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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 19:30 HKT 12/Sep/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 12 September 2018

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

    Weather Situation:
    At 7 p.m., Tropical Storm Barijat with maximum sustained winds of about 85 kilometres per hour near its centre was located near 21.0 degrees north, 113.6 degrees east. It is forecast to move west at about 20 kilometres per hour in the general direction of the coast of western Guangdong.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 7 to 8, becoming southeast force 7 to 8.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Nan'ao:
    East to southeast force 5 to 6, occasionally force 7.
    Heavy squally showers and thunderstorms.
    Rough seas.

    Shanwei:
    East to southeast force 6 to 7.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    South of Hong Kong:
    Southeast force 8 to 9.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Shangchuan Dao:
    Cyclonic force 8 to 9, becoming south to southeast force 8 to 9.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Outlook for the next 48 hours
    East to northeasterly winds of force 6 to 7, up to force 8 in east. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind east force 6
      Visibility 13 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 3800 Metres in rain

    Dongsha Wind east-southeast force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 8

    Macau Wind northeast force 4
      Visibility 21 Kilometres

    Xisha Wind north-northeast force 2
      Visibility 30 Kilometres

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

    Bulletin issued at 17:30 HKT 12/SEP/2018
    (Next update at 01:30 HKT 13/SEP/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     SEV TURB AND SEV GUSTS.  GALE FORCE WINDS. ISOL
     CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 4 P.M., TROPICAL STORM BARIJAT WAS CENTRED
     NEAR 21.0 DEGREES NORTH 114.1 DEGREES EAST AND
     IS FORECAST TO MOVE WEST AT ABOUT 11 KNOTS IN
     THE GENERAL DIRECTION OF THE COAST OF WESTERN
     GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  080/20-25
                  BECMG  120/20-25
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  080/30-35G45
                  BECMG 120/30-35G45                   29-26
   B.   2000 FT:  090/20-25G35
                  BECMG 110/30-35G45                   22
   C.   5000 FT:  090/25                               18
   D.  10000 FT:  120/30                               10
   E.  18000 FT:  110/30                               MS3
   F.  24000 FT:  110/15                               MS12
   G.  30000 FT:  090/25                               MS29
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SQUALLY SHOWERS.
      SHOWERS WILL BE MORE FREQUENT WITH
      THUNDERSTORMS AT FIRST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT SCT 5000FT. TEMPO FEW CB 1000 FT
      SCT 2000 FT  BKN 4000 FT
   K. VISIBILITY    : 9 KM. TEMPO 3000 M IN SHOWERS. TEMPO 2000 M IN TS
   L. 0 DEG. C LEVEL: 16000 FT      10 DEG. C LEVEL(S) : 10000 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS, OFFSHORE AND  NEAR HILLS
   N. SEA STATE     : 5.0-7.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     FRESH TO STRONG EASTERLY WINDS, OCCASIONALLY
     GALE OFFSHORE.  
     MAINLY CLOUDY WITH A FEW SQUALLY SHOWERS.
     SHOWERS WILL BE MORE FREQUENT WITH THUNDERSTORMS
     AT FIRST.=

    ===================================================================
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 21:20 HKT on 12 Sep 18

    VHHK SIGMET 10 VALID 121140/121540 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N2018 E11700 - N2142 E11554 - N2248 E11548 - N2324 E11730 - N2100 E11730 TOP FL450 MOV S 5KT NC= VHHK SIGMET 8 VALID 121020/121500 VHHH- VHHK HONG KONG FIR TC BARIJAT PSN N2100 E11354 CB OBS AT 0900Z WI 120NM OF TC CENTRE TOP FL500 NC FCST AT 1500Z TC CENTRE PSN N2100 E11242= VHHK SIGMET 11 VALID 121320/121800 VHHH- VHHK HONG KONG FIR TC BARIJAT PSN N2100 E11330 CB OBS AT 1200Z WI 120NM OF TC CENTRE TOP FL500 NC FCST AT 1800Z TC CENTRE PSN N2100 E11212=

    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 20:45 HKT 12/Sep/2018

    Tropical Cyclone Warning Bulletin

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

    The Strong Wind Signal, No. 3 is in force.

    This means that winds with mean speeds of 41 to 62 kilometres per hour are expected.

    At 9 p.m., Tropical Storm Barijat was estimated to be about 180 kilometres south-southwest of Hong Kong (near 20.9 degrees north 113.4 degrees east) and is forecast to move west at about 20 kilometres per hour in the general direction of the coast of western Guangdong.

    Barijat is moving gradually away from Hong Kong. However, the strong winds associated with Barijat are expected to continue affecting the Pearl River Estuary tonight. Strong Wind Signal, No. 3 will still be in effect for some time. Local winds will gradually weaken tomorrow. The public is advised to take note of the latest weather information before leaving home tomorrow morning.

    In the past hour, the maximum sustained winds recorded at Waglan Island and Cheung Chau Beach were 51 and 48 kilometres per hour respectively.

    (Precautionary Announcements with No. 3 Signal)

    1. Please take precautions now. Make sure objects likely to be blown away are securely fastened or taken indoors.

    2. Seas are rough and there are swells, you are advised to stay away from the shoreline and not to engage in water sports.

    3. Small vessels not yet in typhoon shelters should seek shelter without delay. Use heavy anchors and check that all deck fittings are firmly fastened.

    4. Avoid staying in areas exposed to high winds. Drivers using highways and flyovers should be alert to violent gusts.

    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 21:30 HKT 12/Sep/2018


    Tropical Cyclone Warning

    At 121200 UTC, the tropical storm Barijat (1823) with central pressure 988 hectopascals was centred within 90 nautical miles of two one point zero degrees north (21.0 N) one one three point five degrees east (113.5 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 45 knots.

    Radius of over 33 knot winds 60 nautical miles.
    Radius of over 2 metre waves 120 nautical miles.

    Forecast position and intensity at 131200 UTC
    Two one point two degrees north (21.2 N)
    One zero eight point five degrees east (108.5 E)
    Maximum winds 30 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/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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