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

At 10 a.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 73 per cent.
During the past hour the mean UV Index recorded at King's Park was 3. 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 28 degrees;
Wong Chuk Hang 28 degrees;
Ta Kwu Ling 30 degrees;
Lau Fau Shan 28 degrees;
Tai Po 28 degrees;
Sha Tin 29 degrees;
Tuen Mun 30 degrees;
Tseung Kwan O 28 degrees;
Sai Kung 29 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 29 degrees;
Tsing Yi 29 degrees;
Shek Kong 29 degrees;
Tsuen Wan Ho Koon 28 degrees;
Tsuen Wan Shing Mun Valley 28 degrees;
Hong Kong Park 28 degrees;
Shau Kei Wan 28 degrees;
Kowloon City 28 degrees;
Happy Valley 29 degrees;
Wong Tai Sin 29 degrees;
Stanley 28 degrees;
Kwun Tong 28 degrees;
Sham Shui Po 29 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 29 degrees;
Tai Mei Tuk 28 degrees.

Here is the information on Tropical Storm Barijat:
Location: 20.8 degrees north, 115.3 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 10:10 HKT 12/Sep/2018

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

Weather forecast for today

Sunny intervals and a few squally showers. Showers will be more frequent with thunderstorms. Fresh east to northeasterly winds. Winds will strengthen gradually. Seas will be rough with swells.

Outlook : Still windy with squally showers at first tomorrow. Sunny periods on Friday and Saturday. Weather will deteriorate significantly with frequent heavy rain and squalls. Seas will be rough with swells on Sunday.


(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 09:00 HKT 12/Sep/2018

GALE WARNING AREAS: KWANGTUNG, PRATAS AND PARACEL.

GENERAL SITUATION AT 112100 UTC:
FOR DETAILS ON THE TROPICAL STORM BARIJAT (1823), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 120100 UTC:

HONG KONG= E TO NE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL NE 2 M. TEMP 30-26 C. =
KWANGTUNG= N TO NE 6-7, BEC CYCLONIC 8-9. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, BEC 6-8 M. SWELL NE 2-3 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 SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E TO NE 2-3 M. =
PRATAS= CYCLONIC 8-9, BEC SE 6-7. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, BEC 3-4 M. SWELL NE 2-3 M. =
BALINTANG= E TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E TO NE 2-3 M. =
SCARBOROUGH= E TO SE 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 NW 6-7, BEC CYCLONIC 8-9. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, BEC 6-8 M. SWELL NE 2-3 M. =
TONKIN= E TO NE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 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
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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 09:30 HKT 12/Sep/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 12 September 2018

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

    Weather Situation:
    At 9 a.m., Tropical Storm Barijat with maximum sustained winds of about 65 kilometres per hour near its centre was located at 20.7 degrees north, 115.4 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:
    East to northeast force 5 to 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao:
    South to southeast force 6 to 7.
    Frequent heavy squally showers and thunderstorms.
    Rough seas.

    Shanwei:
    Cyclonic force 8 to 9, becoming south to southeast force 7 to 8.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

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

    Shangchuan Dao:
    North to northeast force 6 to 7, becoming cyclonic force 8 to 9.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Outlook for the next 48 hours
    East to southeasterly winds of force 6 to 7. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind northeast force 6
      Visibility 31 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 30 Kilometres

    Dongsha Wind south force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind northeast force 5

    Macau Wind north-northeast force 3
      Visibility 14 Kilometres

  • Explanation of Seas or Sea Waves
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  • 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 09:30 HKT 12/SEP/2018
    (Next update at 12:30 HKT 12/SEP/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 9 A.M., TROPICAL STORM BARIJAT WAS CENTRED
     NEAR 20.7 DEGREES NORTH 115.4 DEGREES EAST AND
     IS FORECAST TO MOVE WEST AT ABOUT 10 KNOTS IN
     THE GENERAL DIRECTION OF THE COAST OF WESTERN
     GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  040/10-15
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  040/20-25
                  BECMG 090/25-30                      27-33
   B.   2000 FT:  050/20-25                            22
   C.   5000 FT:  070/25                               17
   D.  10000 FT:  080/20                               11
   E.  18000 FT:  060/25                               MS1
   F.  24000 FT:  050/30                               MS10
   G.  30000 FT:  080/30                               MS23
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      SUNNY INTERVALS WITH SQUALLY SHOWERS AND
      THUNDERSTORMS. SHOWERS WILL BE MORE FREQUENT
      LATER.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT. TEMPO FEW CB 1000 FT  SCT 2000 FT
      BKN 4000 FT
   K. VISIBILITY    : 9 KM. TEMPO 4000 M IN SHOWERS. TEMPO 2000 M IN TS
   L. 0 DEG. C LEVEL: 16000 FT      10 DEG. C LEVEL(S) : 10600 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS, OFFSHORE AND NEAR HILLS
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 26 DEG
IV.  FURTHER OUTLOOK: 
     FRESH TO STRONG EASTERLY WINDS.  MAINLY CLOUDY.
     THERE WILL BE SQUALLY SHOWERS AND 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 09:30 HKT on 12 Sep 18

    VHHK SIGMET 1 VALID 120130/120600 VHHH- VHHK HONG KONG FIR TC BARIJAT PSN N2042 E11536 CB OBS AT 0000Z WI 150NM OF TC CENTRE TOP FL500 NC FCST AT 0600Z TC CENTRE PSN N2048 E11442= VHHK SIGMET 18 VALID 112215/120300 VHHH- VHHK HONG KONG FIR TC BARIJAT PSN N2042 E11600 CB OBS AT 2100Z WI 150NM OF TC CENTRE TOP FL500 NC FCST AT 0300Z TC CENTRE PSN N2048 E11500=

    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 09:45 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 10 a.m., Tropical Storm Barijat was estimated to be about 200 kilometres southeast of Hong Kong (near 20.8 degrees north 115.3 degrees east) and is forecast to move west at about 18 kilometres per hour in the general direction of the coast of western Guangdong.

    According to the present forecast track, Barijat is expected to skirt around 100 to 200 kilometres south of Hong Kong later this afternoon. Local winds will strengthen gradually with occasional squally showers. The Observatory will issue the Strong Wind Signal, No.3 between 11 a.m. and 1 p.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 and rough sea, you are advised to stay away from the shoreline and not to engage in water sports.

    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

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    Severe Weather Information Centre

    Bulletin issued at 09:30 HKT 12/Sep/2018


    Tropical Cyclone Warning

    At 120000 UTC, the tropical storm Barijat (1823) with central pressure 994 hectopascals was centred within 90 nautical miles of two zero point seven degrees north (20.7 N) one one five point six degrees east (115.6 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 130000 UTC
    Two one point two degrees north (21.2 N)
    One one one point four degrees east (111.4 E)
    Maximum winds 45 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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