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Bulletin issued at 11:02 HKT 18/Sep/2018

At 11 a.m. at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 82 per cent.
During the past hour the mean UV Index recorded at King's Park was 7. The intensity of UV radiation was high.

The air temperatures at other places were:

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


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


Climatological Information for 18 Sep

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 10:45 HKT 18/Sep/2018

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

Showers associated with the remnants of Mangkhut are affecting the western part of the coast of Guangdong.

Weather forecast for today

Sunny periods. A few showers at first. Moderate to fresh east to southeasterly winds, occasionally strong offshore and on high ground in the western part of the territory at first. There will be swells at first.

Outlook : Mainly fine apart from isolated showers in the next couple of days.


(The above forecast period is valid up to 23:59 HKT today, 18/09/2018; 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 18/Sep/2018

N0 WARNING.

GENERAL SITUATION AT 172100 UTC:
AN EASTERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 180100 UTC:

HONG KONG= E TO SE 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL E TO NE 2 M, SW 2-3 M. TEMP 31-26 C. =
KWANGTUNG= E TO SE 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL E TO NE 2 M, SW 3 M. =
TAIWAN STRAIT= NE 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL NE 2 M, SW 2-3 M. =
BASHI= E TO NE 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL E 2 M, SW 2-3 M. =
PRATAS= E TO SE 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E TO NE 2 M, SW 3 M. =
BALINTANG= E 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL E 2 M, SW 2-3 M. =
SCARBOROUGH= E TO SE 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E TO NE 2 M, SW 3 M. =
PARACEL= SE 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL E TO NE 2 M, SW 3 M. =
TONKIN= SE 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 2 M, S TO SW 3 M. =
DANANG= SE 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL E 2 M, S TO SW 3 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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    9-day Weather Forecast | UV Index Forecast | Weather Information for Fishermen

    Bulletin issued at 09:30 HKT 18/Sep/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 18 September 2018

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    An easterly airstream is affecting the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to southeast force 5 to 6, occasionally force 7.
    Isolated squally showers and thunderstorms.
    Rough seas.

    Nan'ao and Shanwei:
    East to southeast force 5 to 6.
    Isolated squally showers and thunderstorms.
    Rough seas.

    South of Hong Kong:
    East to southeast force 5 to 6, occasionally force 7.
    Isolated squally showers and thunderstorms.
    Rough seas.

    Shangchuan Dao:
    Southeast force 5 to 6, occasionally force 7.
    Isolated squally showers and thunderstorms.
    Rough seas.

    Outlook for the next 48 hours
    Easterly winds of force 5 to 6. Isolated showers and thunderstorms.

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

    Waglan Island Wind east force 4
      Visibility 19 Kilometres

    Shantou Wind east force 1
      Visibility 26 Kilometres

    Dongsha Wind east force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind east-southeast force 6

    Macau Wind east force 2
      Visibility 9 Kilometres

    Xisha Wind southeast force 3
      Visibility 14 Kilometres in showers

  • 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 09:30 HKT 18/SEP/2018
    (Next update at 12:30 HKT 18/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 :
     A SOUTHEASTERLY AIRSTREAM IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  120/15-20
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  130/20-25                            27-32
   B.   2000 FT:  110/20-25                            22
   C.   5000 FT:  150/20                               19
   D.  10000 FT:  150/25                               11
   E.  18000 FT:  130/20                               MS2
   F.  24000 FT:  100/20                               MS12
   G.  30000 FT:  100/30                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      SUNNY PERIODS WITH A FEW SHOWERS AND ISOLATED
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 2500 FT. 
      TEMPO FEW CB 1200 FT  SCT 2000 FT BKN 4500 FT.
   K. VISIBILITY    : 10 KM. TEMPO 3000 M IN SHOWERS.
                      TEMPO 1500 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 10400 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS, OFFSHORE AND  NEAR HILLS
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE EASTERLY WINDS.  MAINLY FINE.=

    ===================================================================
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 06:55 HKT on 18 Sep 18

    VHHK SIGMET 6 VALID 171900/172300 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1800 E11506 - N1642 E11400 - N1930 E11130 - N1954 E11130 - N2018 E11424 - N1800 E11506 TOP FL380 STNR WKN= VHHK SIGMET 7 VALID 172300/180300 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1700 E11418 - N1642 E11400 - N1924 E11136 - N1936 E11130 - N2006 E11130 - N2100 E11318 - N1700 E11418 TOP FL350 STNR WKN=

    Please click here for more about the SIGMET

    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 21:30 HKT 17/Sep/2018


    Tropical Cyclone Warning

    At 171200 UTC, Tropical Depression Mangkhut (1822) has weakened into an area of low pressure.

    No further warnings on this area of low pressure will be issued by the Hong Kong Observatory unless regeneration takes place.



    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 18/Sep/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     30.4 C
Minimum Air Temperature                     25.8 C
Grass Minimum Temperature                   24.2 C
Relative Humidity                        79 - 95 Percent
Rainfall                                    12.0 mm 
Total rainfall since 1st January          1855.7 mm
Against an average of                     2129.7 mm

Other Stations                Min                  Max
King's Park                  25.6 C               29.1 C
Wong Chuk Hang               25.7 C               29.3 C
Ta Kwu Ling                  25.8 C               31.3 C
Lau Fau Shan                 24.3 C               30.9 C
Sha Tin                      26.7 C               29.1 C
Tuen Mun                     25.8 C               28.9 C
Tseung Kwan O                25.5 C               28.5 C
Sai Kung                     26.1 C               28.7 C
Cheung Chau                  25.1 C               29.4 C
Chek Lap Kok                 26.8 C               30.6 C
Tsing Yi                     26.2 C               29.3 C
Shek Kong                    25.4 C               31.4 C
Tsuen Wan Ho Koon            24.2 C               28.5 C
Tsuen Wan Shing Mun Valley   25.5 C               29.9 C
Hong Kong Park               25.8 C               29.5 C
Shau Kei Wan                 25.4 C               28.0 C
Kowloon City                 25.1 C               28.6 C
Happy Valley                 26.2 C               30.1 C
Wong Tai Sin                 25.8 C               29.5 C
Stanley                      26.0 C               29.1 C
Kwun Tong                    25.5 C               28.7 C
Sham Shui Po                 25.9 C               29.9 C
Kai Tak Runway Park          26.0 C               28.2 C
Yuen Long Park               25.3 C               31.2 C
Tai Mei Tuk               25.2 C               29.3 C

Duration of sunshine (King's Park):              1.3 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 (17 Sep 2018) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 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                           0.08
Tap Mun                             0.09
Kat O                               0.10
Yuen Ng Fan                         0.11
Tai Mei Tuk                         0.11
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.09
King's Park                         0.14
Tsim Bei Tsui                       0.12
Cape D'Aguilar                      0.12
Chek Lap Kok                        0.13

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 17 Sep
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