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Bulletin issued at 17:02 HKT 11/Sep/2018

At 5 p.m. at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 52 per cent.
During the past hour the mean UV Index recorded at King's Park was 1. The intensity of UV radiation was low.

Hot weather might cause adverse health effects. The Observatory advises the public to stay on the alert.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.

The air temperatures at other places were:

King's Park 31 degrees;
Wong Chuk Hang 30 degrees;
Ta Kwu Ling 32 degrees;
Lau Fau Shan 30 degrees;
Tai Po 31 degrees;
Sha Tin 32 degrees;
Tuen Mun 31 degrees;
Tseung Kwan O 28 degrees;
Sai Kung 30 degrees;
Cheung Chau 31 degrees;
Chek Lap Kok 31 degrees;
Tsing Yi 32 degrees;
Shek Kong 32 degrees;
Tsuen Wan Ho Koon 30 degrees;
Tsuen Wan Shing Mun Valley 32 degrees;
Hong Kong Park 30 degrees;
Shau Kei Wan 30 degrees;
Kowloon City 32 degrees;
Happy Valley 31 degrees;
Wong Tai Sin 32 degrees;
Stanley 30 degrees;
Kwun Tong 31 degrees;
Sham Shui Po 32 degrees;
Kai Tak Runway Park 30 degrees;
Yuen Long Park 32 degrees;
Tai Mei Tuk 31 degrees.

Here is the information on Tropical Storm Barijat:
Location: 20.8 degrees north, 117.8 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 11 Sep

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 16:45 HKT 11/Sep/2018

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

Weather forecast for tonight and tomorrow

Mainly fine, becoming cloudy tomorrow. There will be squally showers and thunderstorms later. Temperatures will range between 26 and 30 degrees. Moderate northerly winds, becoming fresh northeasterlies tomorrow, occasionally strong later. There will be swells.

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


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

GALE WARNING AREAS: TAIWAN STRAIT, BASHI AND PRATAS.

GENERAL SITUATION AT 102100 UTC:
FOR DETAILS ON THE TROPICAL DEPRESSION OVER LUZON STRAIT, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 110100 UTC:

HONG KONG= N 3-4, 5 LATER. DOWN TO 4000 M IN SOME HAZE. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS LATER. SEA UP TO 2 M LATER. SWELL NE UP TO 2 M. TEMP 32-27 C. =
KWANGTUNG= N TO NE 6-7. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. DOWN TO 4000 M IN SOME HAZE IN W. SEA 3-4 M. SWELL NE 2 M. =
TAIWAN STRAIT= NE 6-7, UP TO 8 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M AT FIRST. SWELL N TO NE 2 M. =
BASHI= CYCLONIC 7-8, BEC E TO SE 5-6. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, 2-3 M LATER. SWELL N TO NE 2 M. =
PRATAS= N 7-8, BEC CYCLONIC 8. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 2 M. =
BALINTANG= S 6-7, E TO SE 5-6 LATER. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, 2-3 M LATER. SWELL NE 2 M. =
SCARBOROUGH= S TO SW 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 5-6, 7 LATER. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M, 4 M LATER. SWELL NE 2 M. =
TONKIN= E TO NE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= N TO NE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 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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    Bulletin issued at 16:30 HKT 11/Sep/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 11 September 2018

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

    Weather Situation:
    At 4 p.m., Tropical Storm Barijat with maximum sustained winds of about 65 kilometres per hour near its centre was located near 20.8 degrees north, 117.9 degrees east. It is forecast to move west at about 14 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, up to force 6 later.
    Scattered squally showers and thunderstorms later.
    Moderate to rough seas.

    Nan'ao:
    East to northeast force 7 to 8, becoming cyclonic force 8.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Shanwei:
    North to northeast force 6 to 7, becoming cyclonic force 8.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    South of Hong Kong:
    North to northeast force 5 to 6, becoming cyclonic force 8 later.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Shangchuan Dao:
    North to northeast force 5 to 6, becoming force 7 later.
    Scattered squally showers and thunderstorms.
    Moderate to 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. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind southwest force 2
      Visibility 23 Kilometres

    Shantou Wind northeast force 2
      Visibility 30 Kilometres

    Dongsha Wind north-northwest force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind northwest force 4

    Macau Wind north-northeast force 3
      Visibility 13 Kilometres

    Xisha Wind west-southwest force 2
      Visibility 30 Kilometres

  • Explanation of Seas or Sea Waves
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  • Descriptive Terms of Wind Speeds
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 12:30 HKT 11/SEP/2018
    (Next update at 17:30 HKT 11/SEP/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE NORTHEAST MONSOON IS AFFECTING GUANGDONG.
     AT NOON, TROPICAL STORM BARIJAT WAS CENTRED NEAR
     20.8 DEGREES NORTH 118.2 DEGREES EAST AND IS
     FORECAST TO MOVE WEST AT ABOUT 6 KNOTS IN THE
     GENERAL DIRECTION OF THE COAST OF WESTERN
     GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1300 TO 2300 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  020/5-10
       OFFSHORE:  020/10-15                            33-26
   B.   2000 FT:  020/10                               23
   C.   5000 FT:  020/10                               17
   D.  10000 FT:  040/15                               12
   E.  18000 FT:  020/10                               0
   F.  24000 FT:  080/15                               MS10
   G.  30000 FT:  040/10                               MS23
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE.  LOCALIZED HAZE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT.
   K. VISIBILITY    : 9 KM.  TEMPO 4000 M IN HAZE.
   L. 0 DEG. C LEVEL: 18000 FT      10 DEG. C LEVEL(S) : 12000 FT
   M. TURBULENCE    : NIL
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT TO MODERATE NORTHERLY WINDS.  MAINLY FINE
     BUT HAZY.=

    ===================================================================
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 15:55 HKT on 11 Sep 18

    VHHK SIGMET 3 VALID 110600/111000 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1824 E11542 - N1924 E11418 - N2254 E11648 - N2300 E11730 - N2100 E11730 TOP FL500 MOV W 06KT INTSF= VHHK SIGMET 4 VALID 111155/111755 VHHH- VHHK HONG KONG FIR TC BARIJAT PSN N2048 E11718 CB FCST AT 1155Z WI 150NM OF TC CENTRE TOP FL500 INTSF FCST AT 1755Z TC CENTRE PSN N2048 E11636= VHHK SIGMET 6 VALID 111100/111700 VHHH- VHHK HONG KONG FIR TC BARIJAT PSN N2048 E11718 CB FCST AT 1100Z WI 180NM OF TC CENTRE TOP FL500 INTSF FCST AT 1700Z TC CENTRE PSN N2048 E11630=

    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 16:45 HKT 11/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 p.m., Tropical Storm Barijat was estimated to be about 410 kilometres east-southeast of Hong Kong (near 20.8 degrees north 117.8 degrees east) and is forecast to move west at about 14 kilometres per hour in the general direction of the coast of western Guangdong.

    The circulation of Barijat is relatively small. It will still maintain some distance from Hong Kong tonight. Barijat is expected to edge slightly closer to the Pearl River Estuary tomorrow and its associated squally showers will affect Hong Kong gradually. The Observatory will take into account the variation of local wind strength to consider issuing the Strong Wind Signal, No. 3 tomorrow. The public is advised to take note of the latest weather information before leaving home tomorrow morning.

    (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. 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 15:30 HKT 11/Sep/2018


    Tropical Cyclone Warning

    At 110600 UTC, the tropical storm Barijat (1823) with central pressure 994 hectopascals was centred within 90 nautical miles of two zero point eight degrees north (20.8 N) one one eight point one degrees east (118.1 E) and is forecast to move west at about 8 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 120600 UTC
    Two zero point eight degrees north (20.8 N)
    One one four point six degrees east (114.6 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 130600 UTC
    Two one point one degrees north (21.1 N)
    One one zero point two degrees east (110.2 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 140600 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 11/Sep/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.3 C
Minimum Air Temperature                     24.3 C
Grass Minimum Temperature                   24.9 C
Relative Humidity                        68 - 94 Percent
Rainfall                                     0.2 mm 
Total rainfall since 1st January          1673.7 mm
Against an average of                     2022.5 mm

Other Stations                Min                  Max
King's Park                  23.8 C               29.1 C
Wong Chuk Hang               24.0 C               29.5 C
Ta Kwu Ling                  23.0 C               29.0 C
Lau Fau Shan                 23.8 C               27.9 C
Tai Po                       24.3 C               28.2 C
Sha Tin                      23.9 C               28.4 C
Tuen Mun                     24.5 C               28.3 C
Tseung Kwan O                23.1 C               28.8 C
Sai Kung                     24.4 C               29.0 C
Cheung Chau                  23.0 C               28.7 C
Chek Lap Kok                 25.6 C               30.9 C
Tsing Yi                     24.3 C               29.6 C
Shek Kong                    23.6 C               30.5 C
Tsuen Wan Ho Koon            22.8 C               26.7 C
Tsuen Wan Shing Mun Valley   23.4 C               30.2 C
Hong Kong Park               23.2 C               29.4 C
Shau Kei Wan                 23.5 C               30.0 C
Kowloon City                 24.0 C               29.8 C
Happy Valley                 24.3 C               30.1 C
Wong Tai Sin                 24.2 C               29.3 C
Stanley                      24.0 C               28.3 C
Kwun Tong                    24.2 C               28.9 C
Sham Shui Po                 24.6 C               30.5 C
Kai Tak Runway Park          24.6 C               28.9 C
Yuen Long Park               23.8 C               30.2 C
Tai Mei Tuk               23.6 C               29.2 C

Duration of sunshine (King's Park):              3.3 H
The mean UV index recorded at King's Park yesterday was 2,
the UV intensity was Low.
The maximum UV index for yesterday was 7.
 

Yesterday's (10 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 10 Sep
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