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Bulletin issued at 11:26 HKT 16/Sep/2018

At 11 a.m. at the Hong Kong Observatory the air temperature was 24 degrees Celsius and the relative humidity 98 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.5. 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 was issued at 11:25 a.m.

The air temperatures at other places were:

King's Park 24 degrees;
Wong Chuk Hang 25 degrees;
Ta Kwu Ling 24 degrees;
Lau Fau Shan 24 degrees;
Tai Po 25 degrees;
Sha Tin 24 degrees;
Tuen Mun 24 degrees;
Tseung Kwan O 25 degrees;
Sai Kung 25 degrees;
Cheung Chau 24 degrees;
Chek Lap Kok 25 degrees;
Tsing Yi 24 degrees;
Shek Kong 24 degrees;
Tsuen Wan Ho Koon 23 degrees;
Tsuen Wan Shing Mun Valley 24 degrees;
Hong Kong Park 24 degrees;
Shau Kei Wan 25 degrees;
Kowloon City 24 degrees;
Happy Valley 25 degrees;
Wong Tai Sin 24 degrees;
Stanley 25 degrees;
Kwun Tong 24 degrees;
Sham Shui Po 24 degrees;
Kai Tak Runway Park 25 degrees;
Yuen Long Park 24 degrees;
Tai Mei Tuk 24 degrees.

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

Kwai Tsing 37 to 52 mm;
Tsuen Wan 11 to 51 mm;
Sha Tin 11 to 49 mm;
Islands District 10 to 47 mm;
Sham Shui Po 43 to 46 mm;
Kowloon City 23 to 41 mm;
Tai Po 15 to 39 mm;
Tuen Mun 14 to 38 mm;
Yuen Long 14 to 37 mm;
Wong Tai Sin 14 to 37 mm;
Central & Western District 8 to 35 mm;
Yau Tsim Mong 23 to 35 mm;
Kwun Tong 27 to 32 mm;
Wan Chai 25 to 32 mm;
Sai Kung 9 to 32 mm;
Eastern District 11 to 31 mm;
Southern District 11 to 30 mm;
North District 12 to 27 mm.

Here is the information on Severe Typhoon Mangkhut:
Location: 21.0 degrees north, 114.4 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 10:45 HKT 16/Sep/2018

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

Weather forecast for today

Storm to hurricane force northeasterly 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 : Still heavy squally showers tomorrow. Winds will moderate later. Showers easing off 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 09:30 HKT 16/Sep/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 16 September 2018

    Warnings:
    Hurricane force winds in all areas.

    Weather Situation:
    At 9 a.m., Severe Typhoon Mangkhut with maximum sustained winds of about 175 kilometres per hour near its centre was located near 20.8 degrees north, 114.8 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:
    Northeast force 11 to 12, becoming southeast force 12.
    Frequent heavy squally showers and thunderstorms.
    Phenomenal seas.

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

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

    Shangchuan Dao:
    Northwest force 11 to 12, becoming cyclonic force 12.
    Frequent heavy squally showers and thunderstorms.
    Phenomenal seas.

    Outlook for the next 48 hours
    South to southeasterly winds of force 8 to 9. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind north-northeast force 12
      Visibility 550 Metres

    Shantou Wind east-northeast force 4
      Visibility 9 Kilometres in rain

    Dongsha Wind south-southeast force 11
      Visibility 7 Kilometres in rain

    Huangmaozhou Wind north-northeast force 12

    Macau Wind north force 6
      Visibility 16 Kilometres

    Xisha Wind west force 4
      Visibility 3200 Metres in showers

  • 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 16/SEP/2018
    (Next update at 12:30 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 9 A.M., SEVERE TYPHOON MANGKHUT WAS CENTRED
     NEAR 20.8 DEGREES NORTH 114.8 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 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  060/45-50G65
                  BECMG 120/60-70G85
       OFFSHORE:  060/60-65G80
                  BECMG 120/60-70G85                   24-29
   B.   2000 FT:  060/70-80G90
                  BECMG 120/70-80G90                   21
   C.   5000 FT:  060/80-90G100
                  BECMG 120/80-90G100                  17
   D.  10000 FT:  080/80-90G100
                  BECMG 120/80-90G100                  11
   E.  18000 FT:  080/80-90G100
                  BECMG 120/80-90G100                  MS1
   F.  24000 FT:  060/75-80
                  BECMG 120/75-80                      MS8
   G.  30000 FT:  080/70-75
                  BECMG 120/70-75                      MS19
   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 TO STORM FORCE EAST TO SOUTHEASTERLY WINDS.
     CLOUDY TO OVERCAST. FREQUENT HEAVY RAIN, SQUALLS
     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 09:55 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 11 VALID 160142/160600 VHHH- VHHK HONG KONG FIR TC MANGKHUT PSN N2042 E11506 CB OBS AT 0000Z WI 240NM OF TC CENTRE TOP FL500 NC FCST AT 0600Z TC CENTRE PSN N2124 E11312=

    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 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 11 a.m., Severe Typhoon Mangkhut was centred about 150 kilometres south of Hong Kong (near 21.0 degrees north 114.4 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, edging further closer to Hong Kong with a high threat. According to the present forecast track, Mangkhut will be closest to the Pearl River Delta around noontime today, 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 our offshore waters. In the past hour, the maximum sustained winds recorded at Waglan Island, Tate's Cairn and Green Island were 180, 160 and 129 kilometres per hour with maximum gusts 212, 242 and 228 kilometres per hour respectively.

    Mangkhut's intense rainbands are affecting Hong Kong, bringing frequent squalls and heavy rain. Sea will be phenomenal with swells. Local winds will change gradually from northeasterlies 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 may cause severe flooding in low-lying areas.

    The Observatory makes a special appeal to the members of the public to stay away from the shoreline, and not to engage in water sports.

    (Precautionary Announcements)

    1. Do not go outside. 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 09:30 HKT 16/Sep/2018


    Tropical Cyclone Warning

    Super Typhoon Mangkhut (1822) has weakened into a Severe Typhoon with central pressure 950 hectopascals. At 160000 UTC, it was centred within 30 nautical miles of two zero point seven degrees north (20.7 N) one one five point one degrees east (115.1 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 170000 UTC
    Two two point eight degrees north (22.8 N)
    One zero eight point six degrees east (108.6 E)
    Maximum winds 50 knots.

    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 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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