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Bulletin issued at 11:21 HKT 17/Sep/2018

At 11 a.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 85 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. 3 has been issued.

The air temperatures at other places were:

King's Park 28 degrees;
Wong Chuk Hang 28 degrees;
Ta Kwu Ling 29 degrees;
Lau Fau Shan 28 degrees;
Sha Tin 28 degrees;
Tuen Mun 29 degrees;
Tseung Kwan O 28 degrees;
Sai Kung 28 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 29 degrees;
Tsing Yi 29 degrees;
Shek Kong 30 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 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 28 degrees;
Yuen Long Park 30 degrees;
Tai Mei Tuk 28 degrees.

Between 9:45 and 10:45 a.m., the rainfall recorded in various regions were:

Sha Tin 0 to 1 mm.

Here is the information on Tropical Storm Mangkhut:
Location: 23.2 degrees north, 108.1 degrees east; Maximum sustained wind near its centre: 75 km/h.


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


Climatological Information for 17 Sep

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 10:45 HKT 17/Sep/2018

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

Weather forecast for today

Strong southeasterly winds, occasionally gale force offshore and on high ground at first. Winds becoming fresh later. Mainly cloudy with occasional squally showers and isolated thunderstorms. Seas will be rough with swells at first.

Outlook : Showers easing off gradually and weather will improve in the next couple of days.


(The above forecast period is valid up to 23:59 HKT today, 17/09/2018; 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 17/Sep/2018

GALE WARNING AREAS: HONG KONG, KWANGTUNG, PARACEL AND TONKIN.

GENERAL SITUATION AT 162100 UTC:
FOR DETAILS ON SEVERE TROPICAL STORM MANGKHUT (1822), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 170100 UTC:

HONG KONG= SE 6-7, 8 AT FIRST. DOWN TO 1000 M IN SQUALLY SHOWERS AND TS. SEA 3-4 M, 6 M AT FIRST. SWELL E TO NE 3-5 M, SW 3-5 M. TEMP 29-26 C. =
KWANGTUNG= SE 6-7, 8 AT FIRST. DOWN TO 1000 M IN SQUALLY SHOWERS AND TS. SEA 3-4 M, 6 M AT FIRST. SWELL E TO NE 5 M, SW 5 M. =
TAIWAN STRAIT= SE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 5 M, SW 5 M. =
BASHI= SE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E 5 M, SW 5 M. =
PRATAS= SE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO NE 5 M, SW 5 M. =
BALINTANG= SE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E 5 M, SW 5 M. =
SCARBOROUGH= S 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO NE 5 M, SW 5 M. =
PARACEL= SE 6-7, 8 AT FIRST. DOWN TO 1000 M IN SQUALLY SHOWERS AND TS. SEA 3-4 M, 6 M AT FIRST. SWELL E TO NE 5 M, SW 5 M. =
TONKIN= S 6-7, 8-9 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, 6-8 M AT FIRST. SWELL NE 3 M, S TO SW 3 M. =
DANANG= S TO SW 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E 3 M, S TO SW 3-5 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 17/Sep/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 17 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 9 a.m., Tropical Storm Mangkhut with maximum sustained winds of about 75 kilometres per hour near its centre was located near 22.9 degrees north, 108.4 degrees east. It is forecast to move west-northwest at about 20 kilometres per hour across the inland area of southern China and weaken gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Southeast force 6 to 7, force 8 at first.
    Squally showers and thunderstorms.
    Rough to very rough seas.

    Nan'ao:
    Southeast force 6 to 7.
    Scattered squally showers and thunderstorms.
    Rough seas.

    Shanwei:
    Southeast force 6 to 7, up to force 8 at first.
    Scattered squally showers and thunderstorms.
    Rough to very rough seas.

    South of Hong Kong:
    Southeast force 6 to 7, force 8 at first.
    Squally showers and thunderstorms.
    Rough to very rough seas.

    Shangchuan Dao:
    Southeast force 6 to 7, force 8 at first.
    Frequent squally showers and thunderstorms.
    Rough to very rough seas.

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

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

    Waglan Island Wind east-southeast force 6

    Shantou Wind east force 3
      Visibility 19 Kilometres in rain

    Dongsha Wind south-southeast force 4
      Visibility 9 Kilometres in rain

    Huangmaozhou Wind east-southeast force 7

    Macau Wind east-southeast force 3
      Visibility 6 Kilometres

    Xisha Wind south force 3
      Visibility 12 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 09:30 HKT 17/SEP/2018
    (Next update at 12:30 HKT 17/SEP/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     SEV TURB.  GALE FORCE WINDS. ISOL CUNIM/TS AND
     ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     SEVERE TROPICAL STORM MANGKHUT HAS WEAKENED INTO
     A TROPICAL 
STORM.
     AT 9 A.M., TROPICAL STORM MANGKHUT WAS CENTRED
     NEAR 22.9 DEGREES NORTH 108.4 DEGREES EAST AND
     IS FORECAST TO MOVE WEST-NORTHWEST AT ABOUT 11
     KNOTS ACROSS THE INLAND AREA OF SOUTHERN CHINA
     AND WEAKEN GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  120/20-25
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  120/30-35                            27-32
   B.   2000 FT:  120/30-35                            23
   C.   5000 FT:  170/30-35                            19
   D.  10000 FT:  170/35-40                            11
   E.  18000 FT:  170/40-50                            MS2
   F.  24000 FT:  160/35                               MS11
   G.  30000 FT:  190/30                               MS22
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH SQUALLY SHOWERS AND THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT  SCT 4500 FT BKN 8000 FT. 
      TEMPO FEW  CB 1000 FT  SCT 2000 FT BKN 5000 FT.
   K. VISIBILITY    : 9 KM. TEMPO 3000 M IN SHOWERS.
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 10600 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 4.0-6.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     FRESH TO STRONG SOUTHEASTERLY WINDS.  
     CLOUDY WITH OCCASIONAL SHOWERS AND ISOLATED
     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 08:59 HKT on 17 Sep 18

    VHHK SIGMET 1 VALID 170100/170500 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2006 E11642 - N1642 E11400 - N1930 E11130 - N2130 E11130 - N2318 E11548 - N2006 E11642 TOP FL450 MOV WNW 10KT NC= VHHK SIGMET 11 VALID 162100/170100 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1954 E11636 - N1818 E11518 - N1754 E11254 - N1930 E11130 - N2130 E11130 - N2324 E11606 - N1954 E11636 TOP FL450 MOV W 05KT NC =

    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 10:45 HKT 17/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 11 a.m., Tropical Storm Mangkhut was estimated to be about 630 kilometres west of Hong Kong (near 23.2 degrees north 108.1 degrees east) and is forecast to move west-northwest at about 20 kilometres per hour across the inland area of southern China and weaken gradually.
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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 09:30 HKT 17/Sep/2018


    Tropical Cyclone Warning

    Severe Tropical Storm Mangkhut (1822) has weakened into a Tropical Storm with central pressure 988 hectopascals. At 170000 UTC, it was centred within 90 nautical miles of two two point eight degrees north (22.8 N) one zero eight point six degrees east (108.6 E) and is forecast to move west-northwest at about 10 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 45 knots.

    Radius of over 33 knot winds 90 nautical miles.
    Radius of over 2 metre waves 360 nautical miles over southeast quadrant, 240 nautical miles elsewhere.

    Forecast position and intensity at 180000 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 17/Sep/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.8 C
Minimum Air Temperature                     23.6 C
Grass Minimum Temperature                   24.1 C
Relative Humidity                        55 - 98 Percent
Rainfall                                   167.5 mm 
Total rainfall since 1st January          1843.7 mm
Against an average of                     2118.7 mm

Other Stations                Min                  Max
King's Park                  23.0 C               31.7 C
Wong Chuk Hang               24.2 C               31.8 C
Ta Kwu Ling                  23.8 C               31.9 C
Lau Fau Shan                 23.7 C               31.2 C
Tai Po                       24.8 C               31.8 C
Sha Tin                      23.8 C               32.3 C
Tuen Mun                     24.0 C               32.1 C
Tseung Kwan O                23.7 C               30.8 C
Sai Kung                     24.0 C               31.6 C
Cheung Chau                  23.6 C               30.1 C
Chek Lap Kok                 24.4 C               33.7 C
Tsing Yi                     23.9 C               32.4 C
Shek Kong                    24.1 C               32.1 C
Tsuen Wan Ho Koon            23.1 C               30.8 C
Tsuen Wan Shing Mun Valley   23.8 C               31.4 C
Hong Kong Park               23.6 C               31.6 C
Shau Kei Wan                 23.3 C               31.4 C
Kowloon City                 23.2 C               31.4 C
Happy Valley                 24.3 C               32.2 C
Wong Tai Sin                 23.0 C               31.7 C
Stanley                      23.5 C               31.5 C
Kwun Tong                    23.5 C               31.2 C
Sham Shui Po                 24.0 C               32.0 C
Kai Tak Runway Park          23.4 C               32.1 C
Yuen Long Park               24.0 C               32.1 C
Tai Mei Tuk               23.6 C               31.2 C

Duration of sunshine (King's Park):              0.0 H
The mean UV index recorded at King's Park yesterday was 0.3,
the UV intensity was Low.
The maximum UV index for yesterday was 0.9.
 

Yesterday's (16 Sep 2018) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.10 to
0.16 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                           0.10
Tap Mun                             0.11
Kat O                               0.12
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.14
Sha Tau Kok                         0.12
Kwun Tong                           0.14
Sai Wan Ho                          0.10
King's Park                         0.16
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.14
Chek Lap Kok                        0.15

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 16 Sep
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