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Bulletin issued at 03:02 HKT 17/Sep/2018

At 3 a.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 91 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 8 has been issued.
The Landslip Warning has been issued.

The air temperatures at other places were:

King's Park 27 degrees;
Wong Chuk Hang 27 degrees;
Ta Kwu Ling 28 degrees;
Lau Fau Shan 26 degrees;
Sha Tin 28 degrees;
Tuen Mun 27 degrees;
Tseung Kwan O 27 degrees;
Sai Kung 28 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 28 degrees;
Shek Kong 29 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 27 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 27 degrees;
Happy Valley 27 degrees;
Wong Tai Sin 27 degrees;
Stanley 27 degrees;
Kwun Tong 27 degrees;
Sham Shui Po 28 degrees;
Kai Tak Runway Park 27 degrees;
Yuen Long Park 27 degrees;
Tai Mei Tuk 27 degrees.

Between 1:45 and 2:45 a.m., the rainfall recorded in various regions were:

Yuen Long 0 to 2 mm;
North District 0 to 2 mm;
Tai Po 0 to 1 mm;
Sha Tin 0 to 1 mm.

Here is the information on Severe Tropical Storm Mangkhut:
Location: 22.5 degrees north, 109.8 degrees east; Maximum sustained wind near its centre: 110 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

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Bulletin updated at 02:45 HKT 17/Sep/2018

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

Weather forecast for today

Gale to storm force southeasterly winds at first. Winds will weaken gradually and become fresh to strong. Cloudy to overcast. There will be squally showers and thunderstorms. Seas will be rough to high with swells at first. Temperatures will range between 25 and 28 degrees.

Outlook : Showers easing off gradually and weather will improve in the following 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 21:00 HKT 16/Sep/2018

HURRICANE WARNING AREAS: HONG KONG, KWANGTUNG, PARACEL AND TONKIN.
STORM WARNING AREA: PRATAS.
GALE WARNING AREAS: TAIWAN STRAIT, BASHI, BALINTANG, SCARBOROUGH AND DANANG.

GENERAL SITUATION AT 160900 UTC:
FOR DETAILS ON SEVERE TYPHOON MANGKHUT (1822), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 161300 UTC:

HONG KONG= SE 11-12, 9-10 OVERNIGHT. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 12-14 M, BEC 8-10 M. SWELL E TO NE 3-5 M, SW 3-5 M. TEMP 25-28 C. =
KWANGTUNG= S TO SE 11-12. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 12-14 M. SWELL E TO NE 5-7 M, SW 5-7 M. =
TAIWAN STRAIT= SE 6-7, OCNL 8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL NE 5-7 M, SW 5-7 M. =
BASHI= SE 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 E 5-7 M, SW 5-7 M. =
PRATAS= S TO SE 9-10, BEC 7-8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 8-10 M, BEC 4-6 M. SWELL E TO NE 5-7 M, SW 5-7 M. =
BALINTANG= SE 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 E 5-7 M, SW 5-7 M. =
SCARBOROUGH= S 6-7, UP TO 8 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M AT FIRST. SWELL E TO NE 5-7 M, SW 5-7 M. =
PARACEL= SW 10-11, 12 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 10-12 M, 14 M AT FIRST. SWELL E TO NE 5-7 M, SW 5-7 M. =
TONKIN= NW 8-9, BEC SW UP TO 12. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, UP TO 14 M LATER. SWELL NE 3 M, S TO SW 3 M. =
DANANG= SW 6-7, OCNL 8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 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.


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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 03:30 HKT 17/Sep/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 17 September 2018

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

    Weather Situation:
    Typhoon Mangkhut has weakened into a severe tropical storm. At 3 a.m., Mangkhut with maximum sustained winds of about 110 kilometres per hour near its centre was located near 22.5 degrees north, 109.8 degrees east. It is forecast to move west-northwest at about 30 kilometres per hour into the inland area of southern China and weaken gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Southeast force 9 to 10 at first, becoming force 7 to 8.
    Squally showers and thunderstorms.
    High seas at first, becoming rough to very rough.

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

    Shanwei:
    Southeast force 7 to 8.
    Frequent squally showers and thunderstorms.
    Rough to very rough seas.

    South of Hong Kong:
    Southeast force 9 to 10 at first, becoming force 7 to 8.
    Frequent heavy squally showers and thunderstorms.
    High seas at first, becoming rough to very rough.

    Shangchuan Dao:
    South to southwest force 10 to 11 at first, becoming force 8 to 9.
    Frequent heavy squally showers and thunderstorms.
    High to very high seas at first, becoming very rough to high.

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

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

    Shantou Wind east force 3
      Visibility 20 Kilometres

    Dongsha Wind south force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind southeast force 7

    Macau Wind southeast force 4
      Visibility 6 Kilometres in rain

    Xisha Wind south-southwest force 4
      Visibility 10 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 02:00 HKT 17/SEP/2018
    (Next update at 9:00-9:30 HKT 17/SEP/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     SEV TURB AND SEV GUSTS.  STORM FORCE WINDS. ISOL
     CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 1 A.M., TYPHOON MANGKHUT WAS CENTRED NEAR
     22.4 DEGREES NORTH 110.3 DEGREES EAST AND IS
     FORECAST TO MOVE WEST-NORTHWEST AT ABOUT 16
     KNOTS INTO THE INLAND AREA OF SOUTHERN CHINA AND
     WEAKEN GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  130/30-35G50
                  BEC 130/25
                  TEMPO VRB/25G35 IN TS
       OFFSHORE:  130/40-50G65
                  BEC 130/30-35                        24-30
   B.   2000 FT:  140/60-70G85
                  BEC 140/30-40                        23
   C.   5000 FT:  140/60-70
                  BEC 140/35-45                        18
   D.  10000 FT:  160/70-80
                  BEC 160/35-45                        11
   E.  18000 FT:  160/70-80
                  BEC 160/30-40                        MS1
   F.  24000 FT:  160/70-80
                  BEC 160/30-40                        MS10
   G.  30000 FT:  160/60-70
                  BEC 160/30-40                        MS21
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY TO OVERCAST WITH HEAVY 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    : 7 KM. TEMPO 3000 M IN SHOWERS.
TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 10400 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 5-10 M        SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     FRESH TO STRONG SOUTHEASTERLY WINDS.  
     CLOUDY TO OVERCAST WITH HEAVY SQUALLY SHOWERS.
     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 00:55 HKT on 17 Sep 18

    VHHK SIGMET 9 VALID 161300/161700 VHHH- VHHK HONG KONG FIR EMBD TS FCST W OF E11630 TOP FL500 MOV WNW 15KT NC= VHHK SIGMET 10 VALID 161700/162100 VHHH- VHHK HONG KONG FIR EMBD TS FCST W OF E11630 TOP FL500 MOV W 10KT 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 02:45 HKT 17/Sep/2018

    Tropical Cyclone Warning Bulletin

    Here is the latest Tropical Cyclone Warning Bulletin issued by the Hong Kong Observatory.

    The No. 8 Southeast Gale or Storm Signal is in force.

    This means that winds with mean speeds of 63 kilometres per hour or more are expected from the southeast quarter.

    Typhoon Mangkhut has weakened into a severe tropical storm.

    At 3 a.m., Mangkhut was centred about 450 kilometres west of Hong Kong (near 22.5 degrees north 109.8 degrees east) and is forecast to move west-northwest at about 30 kilometres per hour into the inland area of southern China and weaken gradually.

    Mangkhut continues to move across inland Guangxi, departing further from Hong Kong. Local winds are also weakening gradually. The western part of the territory and high ground are still being affected by gale or storm force winds. Members of the public should still take necessary precautions. It is expected that Mangkhut will weaken gradually today and local winds will moderate further. Depending on the changes in local wind strength, the Observatory will consider whether or not to issue the Strong Wind Signal, No. 3 before 6 a.m. today. Members of the public please take note of the latest weather information this morning.

    Mangkhut brought different degrees of damages to Hong Kong. There may be hidden danger. Members of the public should remain on the alert for assurance of personal safety.

    The outer rainbands of Mangkhut will still bring squally showers to Hong Kong. Sea will be rough to high with swells.

    In the past hour, the maximum sustained winds recorded at Sha Chau, Cheung Chau and Chek Lap Kok were 73, 72 and 65 kilometres per hour with maximum gusts 89, 86 and 87 kilometres per hour respectively.

    (Precautionary Announcements with No. 8 Signal)

    1. Although the tropical cyclone is moving away from Hong Kong, gales are expected to persist for some time. Please continue to stay indoors until winds moderate. Do not touch electric cables that have been blown loose.

    2. Flights at Hong Kong International Airport may be affected by the weather. Please contact your airline for the latest flight information before departing for the airport.

    3. As gales and violent squalls are still occurring in places, precautions should not yet be relaxed.

    4. Please listen to radio or watch TV for the latest weather information broadcast. You can also browse the Hong Kong Observatory's website and mobile app for the information.
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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 03:30 HKT 17/Sep/2018


    Tropical Cyclone Warning

    Typhoon Mangkhut (1822) has weakened into a Severe Tropical Storm with central pressure 975 hectopascals. At 161800 UTC, it was centred within 90 nautical miles of two two point four degrees north (22.4 N) one one zero point one degrees east (110.1 E) and is forecast to move west-northwest at about 14 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 60 knots.

    Radius of over 33 knot winds 270 nautical miles over eastern semicircle, 225 nautical miles elsewhere.
    Radius of over 47 knot winds 120 nautical miles.
    Radius of over 2 metre waves 330 nautical miles.

    Forecast position and intensity at 171800 UTC
    Two three point eight degrees north (23.8 N)
    One zero four point eight degrees east (104.8 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 181800 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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