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Bulletin issued at 16:02 HKT 13/Sep/2018

At 4 p.m. at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 74 per cent.
During the past hour the mean UV Index recorded at King's Park was 4. The intensity of UV radiation was moderate.

According to the present forecast track, Super Typhoon Mangkhut will move towards the vicinity of Luzon on Friday and Saturday. Its track and wind strength near the centre may change under the influence of the terrain of Luzon, but it is expected to remain in the category of super typhoon after entering the South China Sea. Although there are still uncertainties in the subsequent track of Mangkhut and its distance from Hong Kong, Mangkhut’s extensive circulation will bring significantly deteriorating weather to Hong Kong on Sunday with frequent heavy squally showers. Seas will be very rough with swells and low-lying areas may be affected by storm surge. Please take suitable precautions and pay close attention to the latest information on Mangkhut issued by the Observatory.

The air temperatures at other places were:

King's Park 29 degrees;
Wong Chuk Hang 30 degrees;
Ta Kwu Ling 31 degrees;
Lau Fau Shan 30 degrees;
Tai Po 29 degrees;
Sha Tin 30 degrees;
Tuen Mun 31 degrees;
Tseung Kwan O 28 degrees;
Sai Kung 29 degrees;
Cheung Chau 28 degrees;
Chek Lap Kok 32 degrees;
Tsing Yi 30 degrees;
Shek Kong 31 degrees;
Tsuen Wan Ho Koon 29 degrees;
Tsuen Wan Shing Mun Valley 29 degrees;
Hong Kong Park 29 degrees;
Shau Kei Wan 28 degrees;
Kowloon City 29 degrees;
Happy Valley 30 degrees;
Wong Tai Sin 29 degrees;
Stanley 29 degrees;
Kwun Tong 29 degrees;
Sham Shui Po 31 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 31 degrees;
Tai Mei Tuk 28 degrees.

Here is the information on Tropical Depression Barijat at 4 p.m.:
Location: 21.7 degrees north, 109.2 degrees east.


Note: The data above is provisional. Only limited data validation has been carried out.


Climatological Information for 13 Sep

Regional Weather in Hong Kong

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Bulletin updated at 16:15 HKT 13/Sep/2018

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

The outer subsiding air of Super Typhoon Mangkhut is affecting southeastern China.

Tropical Storm Barijat has weakened into a tropical depression. At 4 p.m., Barijat was centred about 150 kilometres southeast of Nanning. It is forecast to move west at about 18 kilometres per hour across Guangxi and dissipate gradually. Meanwhile, Super Typhoon Mangkhut was centred about 940 kilometres east of Manila. It is forecast to move west-northwest at about 22 kilometres per hour towards the vicinity of Luzon.

Weather forecast for tonight and tomorrow

Mainly fine apart from isolated showers. Very hot tomorrow with temperatures ranging between 27 and 33 degrees. Moderate east to northeasterly winds, fresh offshore at first.

Outlook : Very hot on Saturday. Frequent heavy rain and squalls on Sunday and Monday. Seas will be very rough with swells.


(The above forecast period is valid up to 23:59 HKT tomorrow, 14/09/2018; 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 13/Sep/2018

GALE WARNING AREA: KWANGTUNG.

GENERAL SITUATION AT 122100 UTC:
FOR DETAILS ON TROPICAL STORM BARIJAT (1823), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 130100 UTC:

HONG KONG= E 5-6. DOWN TO 1000 M IN SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E 2 M. TEMP 31-27 C. =
KWANGTUNG= E 6-7, SE 8-9 IN W AT FIRST. DOWN TO 1000 M IN SQUALLY SHOWERS AND TS. SEA 3-4 M, 6-8 M IN W AT FIRST. SWELL E 2-3 M. =
TAIWAN STRAIT= NE 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL E TO NE 2 M. =
BASHI= E TO NE 5-6, 7 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M, 4 M LATER. SWELL E 2-3 M. =
PRATAS= E 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL E 2-3 M. =
BALINTANG= E TO NE 5-6, 7 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, 4 M LATER. 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. =
PARACEL= SE 5-6, BEC E 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL NE 2 M. =
TONKIN= NE 6, BEC CYCLONIC 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3 M, BEC 4 M. SWELL NE 2 M. =
DANANG= SW 5-6, BEC E TO NE 5-6. DOWN TO 1000 M IN SQUALLY SHOWERS AND TS. SEA 2-3 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.


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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 16:30 HKT 13/Sep/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 13 September 2018

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

    Weather Situation:
    Tropical Storm Barijat has weakened into a tropical depression. At 4 p.m., Barijat with maximum sustained winds of about 45 kilometres per hour near its centre was located near 21.7 degrees north, 109.2 degrees east. It is forecast to move west at about 18 kilometres per hour across Guangxi and dissipate gradually. At 4 p.m., Super Typhoon Mangkhut with maximum sustained winds of about 240 kilometres per hour near its centre was located near 14.9 degrees north, 129.7 degrees east. It is forecast to move west-northwest at about 22 kilometres per hour towards the vicinity of Luzon.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to northeast force 4 to 5, up to force 6 at first.
    A few showers.
    Moderate seas, rough at first.

    Nan'ao and Shanwei:
    East to northeast force 5 to 6.
    Moderate to rough seas.

    South of Hong Kong:
    East to northeast force 5 to 6.
    Isolated squally showers and thunderstorms.
    Moderate to rough seas.

    Shangchuan Dao:
    East to northeast force 4 to 5.
    Scattered squally showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    North to northeasterly winds of force 7 to 8, becoming cyclonic winds of force 11 to 12 later. Frequent heavy squally showers and thunderstorms later.

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

    Waglan Island Wind east-northeast force 5
      Visibility 14 Kilometres

    Shantou Wind east-southeast force 2
      Visibility 30 Kilometres

    Huangmaozhou Wind east force 6

    Macau Wind east force 3
      Visibility 16 Kilometres

    Xisha Wind northeast force 3
      Visibility 23 Kilometres

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

    Bulletin issued at 12:30 HKT 13/SEP/2018
    (Next update at 17:30 HKT 13/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 :
     SHOWERS ARE AFFECTING THE COASTAL AREAS OF
     GUANGDONG.
     AT NOON, TROPICAL STORM BARIJAT WAS CENTRED NEAR
     21.4 DEGREES NORTH, 110.0 DEGREES EAST AND IS
     FORECAST TO MOVE WEST OR WEST-NORTHWEST AT ABOUT
     12 KNOTS ACROSS LEIZHOU PENINSULA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1300 TO 2300 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  090/15-20
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  100/20-25                            32-27
   B.   2000 FT:  100/20-25                            22
   C.   5000 FT:  120/25                               19
   D.  10000 FT:  120/20                               11
   E.  18000 FT:  130/20                               MS1
   F.  24000 FT:  100/20                               MS12
   G.  30000 FT:  090/20                               MS24
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH ISOLATED SHOWERS AND
      THUNDERSTORMS. SUNNY INTERVALS DURING THE DAY.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT SCT 5000 FT. 
      TEMPO FEW CB 1000 FT  SCT 2000 FT  BKN 4000 FT
   K. VISIBILITY    : 10 KM. TEMPO 3000 M IN SHOWERS. 
                      TEMPO 2000 M IN TS
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 10600 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS AND  AT LOW LEVELS
   N. SEA STATE     : 3.5-4.5 M     SEA TEMPERATURE    : 26 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE EAST TO NORTHEASTERLY WINDS. SUNNY
     PERIODS WITH A FEW SHOWERS.=

    ===================================================================
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 13:38 HKT on 13 Sep 18

    VHHK SIGMET 1 VALID 130140/130540 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2006 E11430 - N2006 E11130 - N2130 E11130 - N2206 E11254 - N2006 E11430 TOP FL400 MOV NW 10KT NC= VHHK SIGMET 2 VALID 130540/130940 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2124 E11636 - N2000 E11600 - N2048 E11130 - N2130 E11130 - N2206 E11254 - N2124 E11636 TOP FL400 MOV WNW 10KT NC=

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    Tropical Cyclone Warning
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    Tropical Cyclone Warning

    There is no tropical cyclone warning signal.

    For other tropical cyclone related information, please visit the World Meteorological Organization Web Site - Severe Weather Information Centre.

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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 13/Sep/2018


    Tropical Cyclone Warning

    The tropical storm Barijat (1823) has weakened into a Tropical Depression with central pressure 1000 hectopascals. At 130600 UTC, it was centred within 90 nautical miles of two one point seven degrees north (21.7 N) one zero nine point five degrees east (109.5 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 25 knots.

    Radius of over 2 metre waves 60 nautical miles.

    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 13/Sep/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.7 C
Minimum Air Temperature                     26.9 C
Grass Minimum Temperature                   25.6 C
Relative Humidity                        73 - 84 Percent
Rainfall                                      Trace 
Total rainfall since 1st January          1673.7 mm
Against an average of                     2038.6 mm

Other Stations                Min                  Max
King's Park                  26.3 C               28.6 C
Wong Chuk Hang               26.2 C               28.8 C
Ta Kwu Ling                  25.8 C               31.9 C
Lau Fau Shan                 25.6 C               30.5 C
Tai Po                       26.3 C               28.9 C
Sha Tin                      25.8 C               29.7 C
Tuen Mun                     26.4 C               30.3 C
Tseung Kwan O                24.9 C               28.3 C
Sai Kung                     25.9 C               28.8 C
Cheung Chau                  25.6 C               28.3 C
Chek Lap Kok                 26.5 C               31.1 C
Tsing Yi                     26.4 C               29.8 C
Shek Kong                    25.9 C               30.0 C
Tsuen Wan Ho Koon            24.9 C               28.2 C
Tsuen Wan Shing Mun Valley   25.8 C               29.5 C
Hong Kong Park               25.6 C               28.1 C
Shau Kei Wan                 25.4 C               29.1 C
Kowloon City                 25.3 C               28.9 C
Happy Valley                 26.5 C               29.2 C
Wong Tai Sin                 25.8 C               28.6 C
Stanley                      26.0 C               28.4 C
Kwun Tong                    25.8 C               28.0 C
Sham Shui Po                 26.0 C               29.6 C
Kai Tak Runway Park          26.8 C               28.8 C
Yuen Long Park               26.1 C               31.8 C
Tai Mei Tuk               25.7 C               29.4 C

Duration of sunshine (King's Park):              1.2 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 8.
 

Yesterday's (12 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 12 Sep
     2003copy right image | Important notices | Privacy policy Last revision date: <13 Sep 2018> 

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