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Bulletin issued at 12:02 HKT 16/Sep/2018

At noon at the Hong Kong Observatory the air temperature was 25 degrees Celsius and the relative humidity 97 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.7. The intensity of UV radiation was low.

Please be reminded that:

The Tropical Cyclone Signal No. 10 has been issued.
The Red Rainstorm Warning Signal has been issued.
The Special Announcement of Flooding in Northern New Territories has been issued.

The air temperatures at other places were:

King's Park 25 degrees;
Wong Chuk Hang 26 degrees;
Ta Kwu Ling 25 degrees;
Lau Fau Shan 24 degrees;
Tai Po 26 degrees;
Sha Tin 26 degrees;
Tuen Mun 25 degrees;
Tseung Kwan O 25 degrees;
Sai Kung 25 degrees;
Cheung Chau 25 degrees;
Chek Lap Kok 26 degrees;
Tsing Yi 26 degrees;
Shek Kong 25 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 25 degrees;
Hong Kong Park 25 degrees;
Shau Kei Wan 25 degrees;
Kowloon City 25 degrees;
Happy Valley 26 degrees;
Wong Tai Sin 25 degrees;
Stanley 25 degrees;
Kwun Tong 25 degrees;
Sham Shui Po 25 degrees;
Kai Tak Runway Park 25 degrees;
Yuen Long Park 25 degrees;
Tai Mei Tuk 25 degrees.

Between 10:45 and 11:45 a.m., the rainfall recorded in various regions were:

Tsuen Wan 16 to 60 mm;
Tuen Mun 16 to 49 mm;
Islands District 4 to 48 mm;
Yuen Long 23 to 46 mm;
Eastern District 7 to 42 mm;
North District 10 to 42 mm;
Central & Western District 7 to 39 mm;
Sham Shui Po 32 to 37 mm;
Kwai Tsing 19 to 35 mm;
Southern District 6 to 35 mm;
Sha Tin 8 to 33 mm;
Kowloon City 21 to 32 mm;
Wong Tai Sin 13 to 32 mm;
Kwun Tong 18 to 31 mm;
Sai Kung 4 to 31 mm;
Yau Tsim Mong 20 to 29 mm;
Tai Po 13 to 29 mm;
Wan Chai 26 to 27 mm.

110.8 millimetres of rainfall were recorded at the Hong Kong Observatory between midnight last night and midday today.

Here is the information on Severe Typhoon Mangkhut:
Location: 21.2 degrees north, 114.2 degrees east; Maximum sustained wind near its centre: 175 km/h.


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


Climatological Information for 16 Sep

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 11:45 HKT 16/Sep/2018

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

Weather forecast for this afternoon and tonight

Storm to hurricane force easterly winds, becoming southeasterlies. Winds will weaken slightly tonight. Cloudy to overcast. There will be frequent heavy rain, squalls, thunderstorms and storm surge. Seas will be phenomenal with swells.

Outlook : There will still be heavy squally showers tomorrow. Winds will moderate later. Showers easing off gradually and becoming fine in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 16/09/2018; 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 16/Sep/2018

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

GENERAL SITUATION AT 152100 UTC:
FOR DETAILS ON SEVERE TYPHOON MANGKHUT (1822), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 160100 UTC:

HONG KONG= NE 11-12, BEC SE 12. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 12-14 M. SWELL E TO NE 3-5 M, SW 3-5 M LATER. TEMP 32-25 C. =
KWANGTUNG= CYCLONIC 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 M. =
TAIWAN STRAIT= S TO SE 8-9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M. SWELL NE 5-7 M, SW 5 M. =
BASHI= S TO SE 9-10, UP TO 11 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 8-10 M, UP TO 12 M AT FIRST. SWELL E 5-7 M, SW 5 M. =
PRATAS= CYCLONIC 12, BEC S TO SE 10-11. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 14 M, BEC 10-12 M. SWELL E TO NE 5-7 M, SW 5 M. =
BALINTANG= S TO SE 9-10, UP TO 11 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 8-10 M, UP TO 12 M AT FIRST. SWELL E 5-7 M, SW 5 M. =
SCARBOROUGH= S TO SW 7-8, 9 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, 8 M AT FIRST. SWELL E TO NE 5-7 M, SW 5 M. =
PARACEL= CYCLONIC 11-12, BEC SW 10-11. 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 M. =
TONKIN= NW 5-6, UP TO 8 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 6 M LATER. SWELL NE 2 M, S TO SW 2 M LATER. =
DANANG= NW 5-6, SW 6-7 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E 2-3 M, S TO SW 3 M LATER. =
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 12:30 HKT 16/Sep/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 p.m. on 16 September 2018

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

    Weather Situation:
    At noon, Severe Typhoon Mangkhut with maximum sustained winds of about 175 kilometres per hour near its centre was located near 21.2 degrees north, 114.2 degrees east. It is forecast to move west-northwest at about 30 kilometres per hour towards the coast of western Guangdong.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to southeast force 11 to 12.
    Frequent heavy squally showers and thunderstorms.
    Phenomenal seas.

    Nan'ao:
    Southeast force 10 to 11, force 8 to 9 later.
    Frequent heavy squally showers and thunderstorms.
    Phenomenal seas.

    Shanwei:
    Southeast force 11 to 12, force 9 to 10 later.
    Frequent heavy squally showers and thunderstorms.
    Phenomenal seas.

    South of Hong Kong and Shangchuan Dao:
    Cyclonic force 12, becoming southeast force 11 to 12.
    Frequent heavy squally showers and thunderstorms.
    Phenomenal seas.

    Outlook for the next 48 hours
    South to southeasterly winds of force 6 to 7, up to force 8 at first. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind east force 12
      Visibility 180 Metres

    Shantou Wind east-northeast force 2
      Visibility 14 Kilometres

    Dongsha Wind south-southeast force 6
      Visibility 7 Kilometres in rain

    Huangmaozhou Wind east-northeast force 12

    Macau Wind north force 9
      Visibility 600 Metres in rain

    Xisha Wind northwest force 4
      Visibility 3100 Metres in showers

  • Explanation of Seas or Sea Waves
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  • 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 16/SEP/2018
    (Next update at 17:30 HKT 16/SEP/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     SEV TURB AND SEV GUSTS.  HURRICANE FORCE WINDS.
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT NOON, SEVERE TYPHOON MANGKHUT WAS CENTRED
     NEAR 21.2 DEGREES NORTH 114.2 DEGREES EAST AND
     IS FORECAST TO MOVE WEST-NORTHWEST AT ABOUT 16
     KNOTS TOWARDS 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:  100/60-70G85
                  140/40-45 LATER
       OFFSHORE:  100/60-70G85
                  140/45-50 LATER                      26-23
   B.   2000 FT:  100/70-80G90
                  140/45-50 LATER                      21
   C.   5000 FT:  060/80-90G100
                  140/50-55 LATER                      17
   D.  10000 FT:  080/80-90G100
                  160/55-60 LATER                      11
   E.  18000 FT:  080/80-90G100
                  160/55-60 LATER                      MS1
   F.  24000 FT:  060/75-80
                  150/50 LATER                         MS9
   G.  30000 FT:  080/70-75
                  150/50 LATER                         MS20
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      2300-2500
   I. WEATHER       : 
      CLOUDY WITH FREQUENT HEAVY RAIN, SQUALLS AND
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1200 FT  SCT 2500 FT. 
      TEMPO FEW CB 1000 FT  SCT 2000 FT BKN 5000 FT.
   K. VISIBILITY    : 10 KM. TEMPO 1500 M IN SHOWERS. 
                      TEMPO 1000 M IN TS.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 11400 FT
   M. TURBULENCE    : SEV
   N. SEA STATE     : 10.0-16.0 M   SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     GALE SOUTHEASTERLY WINDS, BECOMING STRONG WINDS
     LATER.    
     CLOUDY TO OVERCAST. HEAVY 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 12:25 HKT on 16 Sep 18

    VHHK SIGMET 2 VALID 160155/160600 VHHH- VHHK HONG KONG FIR TC MANGKHUT PSN N2054 E11506 CB OBS AT 0000Z WI 240NM OF TC CENTRE TOP FL500 NC FCST AT 0600Z TC CENTRE PSN N2124 E11312= VHHK SIGMET 4 VALID 160425/160900 VHHH- VHHK HONG KONG FIR TC MANGKHUT PSN N2100 E11424 CB OBS AT 0300Z WI 240NM OF TC CENTRE TOP FL500 NC FCST AT 0900Z TC CENTRE PSN N2148 E11230=

    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 11:45 HKT 16/Sep/2018

    Tropical Cyclone Warning Bulletin

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

    The Hurricane Signal, No. 10, is in force.

    This means that winds with mean speeds of 118 kilometres per hour or more are expected.

    At noon, Severe Typhoon Mangkhut was centred about 120 kilometres south of Hong Kong (near 21.2 degrees north 114.2 degrees east) and is forecast to move west-northwest at about 30 kilometres per hour towards the coast of western Guangdong.

    Mangkhut continues to move steadily towards the coast of western Guangdong and poses a severe threat to Hong Kong. According to the present forecast track, Mangkhut will be closest to the Pearl River Delta in the next few hours, skirting about 100 kilometres to the south of Hong Kong. The Hurricane Signal, No. 10 will remain in force for a period of time.

    The circulation of Mangkhut is extensive and damaging winds are affecting Hong Kong. In the past hour, the maximum sustained winds recorded at Tate's Cairn, Waglan Island and Cheung Chau Beach were 189, 168 and 143 kilometres per hour with maximum gusts 256, 190 and 190 kilometres per hour respectively.

    Mangkhut's intense rainbands are also affecting Hong Kong, bringing frequent squalls and heavy rain. Sea will be phenomenal with swells. Local winds are changing gradually to easterlies. Areas which were previously sheltered may become exposed. Members of the public should stay on high alert.

    Under the influence of storm surge, a high water level of about 3.5 metres or more above chart datum is expected at the Victoria Harbour between noon and 4 p.m today; and a high water level of about 3.8 metres or more above chart datum is expected at Tai O between 2 p.m. and 5 p.m. today. The high water level together with the heavy rain will cause severe flooding in low-lying areas.

    The Observatory makes a special appeal to the members of the public to stay in safe place indoor, and not to go outside.

    (Precautionary Announcements)

    1. If you are reasonably protected, stay where you are. Do not touch electric cables that have been blown loose.

    2. Stay away from exposed windows and doors because glass, already under strain from wind pressure, will shatter easily if hit by a flying object. Make sure you have a safe place to shelter. You should only fix broken windows and doors when there is no danger in doing so.

    3. People outdoors should find a safe place now and remain there until the danger is over.

    4. 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.
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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 12:30 HKT 16/Sep/2018


    Tropical Cyclone Warning

    At 160300 UTC, Severe Typhoon Mangkhut (1822) with central pressure 950 hectopascals was centred within 30 nautical miles of two one point zero degrees north (21.0 N) one one four point four degrees east (114.4 E) and is forecast to move west-northwest at about 16 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 95 knots.

    Radius of over 33 knot winds 225 nautical miles.
    Radius of over 47 knot winds 120 nautical miles.
    Radius of over 63 knot winds 90 nautical miles.
    Radius of over 2 metre waves 330 nautical miles.

    Forecast position and intensity at 170300 UTC
    Two three point zero degrees north (23.0 N)
    One zero seven point nine degrees east (107.9 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 180300 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 16/Sep/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     35.1 C
Minimum Air Temperature                     26.8 C
Grass Minimum Temperature                   25.9 C
Relative Humidity                        51 - 86 Percent
Rainfall                                      trace 
Total rainfall since 1st January          1676.2 mm
Against an average of                     2095.8 mm

Other Stations                Min                  Max
King's Park                  26.4 C               34.7 C
Wong Chuk Hang               25.1 C               35.3 C
Ta Kwu Ling                  24.2 C               35.8 C
Lau Fau Shan                 25.7 C               33.4 C
Tai Po                       25.5 C               33.8 C
Sha Tin                      24.7 C               35.3 C
Tuen Mun                     25.2 C               35.1 C
Tseung Kwan O                24.4 C               35.2 C
Sai Kung                     25.7 C               33.8 C
Cheung Chau                  25.3 C               34.0 C
Chek Lap Kok                 26.8 C               36.5 C
Tsing Yi                     26.0 C               35.3 C
Shek Kong                    24.7 C               35.3 C
Tsuen Wan Ho Koon            24.6 C               33.8 C
Tsuen Wan Shing Mun Valley   24.4 C               35.6 C
Hong Kong Park               25.9 C               35.1 C
Shau Kei Wan                 26.4 C               35.3 C
Kowloon City                 26.3 C               35.1 C
Happy Valley                 25.7 C               36.4 C
Wong Tai Sin                 25.6 C               36.2 C
Stanley                      25.4 C               35.7 C
Kwun Tong                    26.7 C               35.1 C
Sham Shui Po                 25.6 C               36.2 C
Kai Tak Runway Park          26.2 C               34.9 C
Yuen Long Park               24.7 C               35.5 C
Tai Mei Tuk               25.6 C               34.1 C

Duration of sunshine (King's Park):              9.7 H
The mean UV index recorded at King's Park yesterday was 5,
the UV intensity was Moderate.
The maximum UV index for yesterday was 10.
Sea surface temperature (Waglan Island):        27.2 C 

Yesterday's (15 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                           0.09
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                          0.08
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 15 Sep
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