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Bulletin issued at 15:02 HKT 12/Sep/2018

At 3 p.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 74 per cent.
During the past hour the mean UV Index recorded at King's Park was 1. The intensity of UV radiation was low.

Super Typhoon Mangkhut now over the western North Pacific will enter the South China Sea this Saturday and move quickly towards the coast of Guangdong. As Mangkhut has a large circulation with intense winds, it will pose considerable threat to the coast of Guangdong. Although there are still uncertainties in its track, Mangkhut is expected to bring adverse weather to Hong Kong on Sunday with frequent squalls and heavy rain according to the present forecast track. Seas will be very rough with swells. Together with the storm surge, low-lying areas may have flooding or backflow of seawater. The Observatory advises members of the public to be fully prepared and to complete all precautionary measures in the next few days. If you have activities later on Saturday and on Sunday, please note that the severe weather may affect your plan. Make appropriate contingency arrangements as soon as possible. Please continue to stay tuned to the latest information on Mangkhut issued by the Observatory.

Please be reminded that:

The Tropical Cyclone Signal No. 3 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 29 degrees;
Tai Po 28 degrees;
Sha Tin 29 degrees;
Tuen Mun 29 degrees;
Tseung Kwan O 27 degrees;
Sai Kung 28 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 30 degrees;
Tsing Yi 29 degrees;
Shek Kong 28 degrees;
Tsuen Wan Ho Koon 27 degrees;
Tsuen Wan Shing Mun Valley 28 degrees;
Hong Kong Park 28 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 27 degrees;
Happy Valley 28 degrees;
Wong Tai Sin 28 degrees;
Stanley 27 degrees;
Kwun Tong 27 degrees;
Sham Shui Po 28 degrees;
Kai Tak Runway Park 28 degrees;
Yuen Long Park 30 degrees;
Tai Mei Tuk 28 degrees.

Here is the information on Tropical Storm Barijat:
Location: 21.0 degrees north, 114.3 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

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Hong Kong Climatology


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Bulletin updated at 14:45 HKT 12/Sep/2018

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

Weather forecast for this afternoon and tonight

Strong easterly winds, occasionally gale offshore, becoming southeasterlies tonight. Mainly cloudy with a few squally showers. Showers will be more frequent with thunderstorms later. Seas will be rough with swells.

Outlook : Still windy and rain will be more frequent at first tomorrow. Sunny periods 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 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 15:00 HKT 12/Sep/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:00 p.m. on 12 September 2018

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

    Weather Situation:
    At 3 p.m., Tropical Storm Barijat with maximum sustained winds of about 65 kilometres per hour near its centre was located near 21.0 degrees north, 114.3 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 force 6 to 7, occasionally force 8, becoming southeast up to force 8.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

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

    Shanwei:
    South to southeast force 6 to 7, force 8 at first.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

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

    Shangchuan Dao:
    North 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 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-northeast force 7
      Visibility 15 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 2600 Metres in rain

    Dongsha Wind south force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind northeast force 6

    Macau Wind north-northeast force 3
      Visibility 16 Kilometres

    Xisha Wind northeast force 1
      Visibility 27 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 12/SEP/2018
    (Next update at 17:30 HKT 12/SEP/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.  GALE FORCE WINDS.
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT NOON, TROPICAL STORM BARIJAT WAS CENTRED NEAR
     20.9 DEGREES NORTH 114.8 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 1300 TO 2300 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  070/20-25
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  060/25-30
                  BECMG 090/30-35                      32-26
   B.   2000 FT:  050/20-25
                  BECMG 080/30-35                      22
   C.   5000 FT:  070/25
                  BECMG 090/30-40                      17
   D.  10000 FT:  080/20
                  BECMG 110/30                         11
   E.  18000 FT:  060/25
                  BECMG 110/30                         MS1
   F.  24000 FT:  070/30                               MS10
   G.  30000 FT:  080/30                               MS23
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH SQUALLY SHOWERS AND
      THUNDERSTORMS. SHOWERS WILL BE MORE FREQUENT
      LATER.
   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 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 15:40 HKT on 12 Sep 18

    VHHK SIGMET 7 VALID 120740/121140 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2118 E11730 - N2242 E11536 - N2354 E11730 - N2118 E11730 TOP FL450 STNR NC= VHHK SIGMET 5 VALID 120725/121200 VHHH- VHHK HONG KONG FIR TC BARIJAT PSN N2100 E11430 CB OBS AT 0600Z WI 120NM OF TC CENTRE TOP FL500 NC FCST AT 1200Z TC CENTRE PSN N2100 E11318=

    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 14:45 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 3 p.m., Tropical Storm Barijat was estimated to be about 150 kilometres south of Hong Kong (near 21.0 degrees north 114.3 degrees east) and is forecast to move west at about 18 kilometres per hour in the general direction of the coast of western Guangdong.
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    TROPICAL CYCLONE WARNING FOR SHIPPING
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    Tropical Cyclone Warning for Shipping

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    Bulletin issued at 15:30 HKT 12/Sep/2018


    Tropical Cyclone Warning

    At 120600 UTC, the tropical storm Barijat (1823) with central pressure 994 hectopascals was centred within 90 nautical miles of two one point zero degrees north (21.0 N) one one four point five degrees east (114.5 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 120 nautical miles.

    Forecast position and intensity at 130600 UTC
    Two one point three degrees north (21.3 N)
    One zero nine point eight degrees east (109.8 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 131800 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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