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Bulletin issued at 21:02 HKT 15/Sep/2018

At 9 p.m. at the Hong Kong Observatory the air temperature was 32 degrees Celsius and the relative humidity 57 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 3 has been issued.
The Very Hot Weather Warning is now in force. Very hot weather might cause adverse health effects. Members of the public should take care to avoid heatstroke.

The air temperatures at other places were:

King's Park 33 degrees;
Wong Chuk Hang 33 degrees;
Ta Kwu Ling 33 degrees;
Lau Fau Shan 32 degrees;
Tai Po 32 degrees;
Sha Tin 33 degrees;
Tuen Mun 33 degrees;
Tseung Kwan O 30 degrees;
Sai Kung 32 degrees;
Cheung Chau 31 degrees;
Chek Lap Kok 34 degrees;
Tsing Yi 33 degrees;
Shek Kong 33 degrees;
Tsuen Wan Ho Koon 32 degrees;
Tsuen Wan Shing Mun Valley 32 degrees;
Hong Kong Park 32 degrees;
Shau Kei Wan 32 degrees;
Kowloon City 32 degrees;
Happy Valley 33 degrees;
Wong Tai Sin 33 degrees;
Stanley 32 degrees;
Kwun Tong 32 degrees;
Sham Shui Po 33 degrees;
Kai Tak Runway Park 33 degrees;
Yuen Long Park 33 degrees;
Tai Mei Tuk 32 degrees.

Here is the information on Super Typhoon Mangkhut:
Location: 19.4 degrees north, 118.1 degrees east; Maximum sustained wind near its centre: 195 km/h.


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


Climatological Information for 15 Sep

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 21:25 HKT 15/Sep/2018

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

Weather forecast for tonight and tomorrow

Strong northeasterly winds. Winds will strengthen significantly tomorrow and becoming storm force southeasterly winds, hurricane offshore and on high ground. Cloudy to overcast. There will be frequent heavy rain, squalls, thunderstorms and storm surge. Seas will be high with swells. Temperatures will range between 25 and 31 degrees tomorrow.

Outlook : Still heavy squally showers on Monday. Winds will weaken gradually later. Showers easing off in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 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 21:00 HKT 15/Sep/2018

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

GENERAL SITUATION AT 150900 UTC:
FOR DETAILS ON SUPER TYPHOON MANGKHUT (1822), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 151300 UTC:

HONG KONG= NE 7-8, BEC SE 12. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, BEC 14 M. SWELL E TO NE 3-5 M. TEMP 25-31 C. =
KWANGTUNG= NE 11-12, CYCLONIC 12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 12-14 M. SWELL E TO NE 5-7 M. =
TAIWAN STRAIT= NE 8-9, BEC SE 8-9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M. SWELL NE 5-7 M. =
BASHI= SE 11-12, BEC SE 9-10. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 12-14 M, BEC 8-10 M. SWELL E 5-7 M. =
PRATAS= NE 11-12, BEC CYCLONIC 12. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 12-14 M. SWELL E TO NE 5-7 M. =
BALINTANG= CYCLONIC 12, BEC S TO SE 9-10. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 14 M, BEC 8-10 M. SWELL E 5-7 M. =
SCARBOROUGH= S TO SW 12, 8-9 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 14 M, 6-8 M LATER. SWELL E TO NE 5-7 M. =
PARACEL= N TO NE 8-9, BEC CYCLONIC 12. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, BEC 14 M. SWELL E TO NE 5-7 M. =
TONKIN= NW 5-6, UP TO 8 LATER. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 6 M LATER. SWELL NE 2 M. =
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. =
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 19:30 HKT 15/Sep/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 15 September 2018

    Warnings:
    Hurricane force winds in all areas.

    Weather Situation:
    At 7 p.m., Super Typhoon Mangkhut with maximum sustained winds of about 195 kilometres per hour near its centre was located near 19.2 degrees north, 118.7 degrees east. It is forecast to move west-northwest at about 30 kilometres per hour across the northern part of the South China Sea towards the coast of western Guangdong.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Northeast force 7 to 8, becoming southeast force 12.
    Frequent heavy squally showers and thunderstorms.
    Very rough seas, becoming phenomenal.

    Nan'ao:
    Southeast force 11 to 12.
    Frequent heavy squally showers and thunderstorms.
    Phenomenal seas.

    Shanwei:
    Northeast force 11 to 12, becoming cyclonic force 12.
    Frequent heavy squally showers and thunderstorms.
    Phenomenal seas.

    South of Hong Kong:
    North to northwest force 8 to 9, becoming cyclonic force 12.
    Frequent heavy squally showers and thunderstorms.
    High seas, becoming phenomenal.

    Shangchuan Dao:
    Northwest force 7 to 8, becoming cyclonic force 12.
    Frequent heavy squally showers and thunderstorms.
    Very rough seas, becoming phenomenal.

    Outlook for the next 48 hours
    South to southeasterly winds of force 10 to 11, up to force 12 at first. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind north-northeast force 4
      Visibility 29 Kilometres

    Shantou Wind north force 1
      Visibility 30 Kilometres in rain

    Huangmaozhou Wind northeast force 3

    Macau Wind north force 3
      Visibility 19 Kilometres

    Xisha Wind north-northwest force 4
      Visibility 16 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
  • Descriptive Terms of Wind Speeds
  • Visibility Readings in Hong Kong Waters
  • Map showing forecast areas
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 15/SEP/2018
    (Next update at 01:30 HKT 16/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 5 P.M, SUPER TYPHOON MANGKHUT WAS CENTRED
     NEAR 19.0 DEGREES NORTH, 119.1 DEGREES EAST AND
     IS FORECAST TO MOVE WEST-NORTHWEST AT ABOUT 16
     KNOTS ACROSS THE NORTHERN PART OF THE SOUTH
     CHINA SEA TOWARDS THE COAST OF WESTERN GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  010/10-15
                  BECMG  030/25-30G40
                  TEMPO VRB/35G45 IN TS
       OFFSHORE:  010/20-25
                  BECMG 030/40-45G55                   35-25
   B.   2000 FT:  360/25-30
                  BECMG 030/40-50G60                   26
   C.   5000 FT:  030/40
                  BECMG 060/60                         21
   D.  10000 FT:  060/40
                  BECMG 070/60                         11
   E.  18000 FT:  060/40
                  BECMG 070/60                         MS2
   F.  24000 FT:  050/40                               MS12
   G.  30000 FT:  080/40                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      BECOMING CLOUDY WITH FREQUENT HEAVY RAIN,
      SQUALLS, THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT. TEMPO FEW CB 1000 FT  SCT 2000 FT
      BKN 5000 FT.
   K. VISIBILITY    : 9 KM. TEMPO 3000 M IN SHOWERS. TEMPO 1500 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11000 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 4.0-9.0 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     GALE TO STORM FORCE NORTHEASTERLY WINDS BECOMING
     EAST TO SOUTHEASTERLY WINDS, OCCASIONALLY UP TO
     HURRICANE FORCE.  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 21:20 HKT on 15 Sep 18

    VHHK SIGMET 3 VALID 151110/151510 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2345 E11730 - N2100 E11500 - N1800 E11400 - N1642 E11400 - N2100 E11730 - N2345 E11730 TOP FL500 MOV WNW 15KT NC= VHHK SIGMET 2 VALID 151800/160000 VHHH- VHHK HONG KONG FIR TC MANGKHUT PSN N1954 E11636 CB FCST AT 1800Z WI 240NM OF TC CENTRE TOP FL500 INTSF FCST AT 0000Z TC CENTRE PSN N2036 E11518= VHHK SIGMET 4 VALID 151800/160000 VHHH- VHHK HONG KONG FIR TC MANGKHUT PSN N2006 E11648 CB FCST AT 1800Z WI 240NM OF TC CENTRE TOP FL500 NC FCST AT 0000Z TC CENTRE PSN N2048 E11512=

    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 20:45 HKT 15/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 9 p.m., Super Typhoon Mangkhut was estimated to be about 520 kilometres southeast of Hong Kong (near 19.4 degrees north 118.1 degrees east) and is forecast to move west-northwest at about 30 kilometres per hour across the northern part of the South China Sea towards the coast of western Guangdong.

    Mangkhut continues to move rapidly towards the coast of western Guangdong, posing a severe threat to the region.

    Mangkhut has extensive circulation with fierce winds. Mangkhut is edgeing progressively closer to the vicinity of the Pearl River Estuary. The Observatory will issue the No.8 Gale or Storm Signal between 11 p.m. tonight to 2 a.m. tomorrow.

    Adverse weather will prevail tomorrow with winds strengthening rapidly and frequent heavy rain and squalls. Sea will be high with swells. Under the influence of storm surge, a high water level of around 3.5 metres above chart datum is expected at the Victoria Harbour between 2 p.m. and 6 p.m tomorrow; whereas a high water level of 4.0 metres above chart datum is expected at Tai O between 4 p.m. and 7 p.m. tomorrow. The high water level 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.

    In the past hour, the maximum sustained winds recorded at Tate's Cairn were 48 kilometres per hour with maximum gusts 60 kilometres per hour.

    (Precautionary Announcements with No. 3 Signal)

    1. Please take precautions now. Make sure objects likely to be blown away are securely fastened or taken indoors. Check if all windows and doors can be securely locked.

    2. Drains should now be cleared of leaves and rubbish. People in low-lying areas should take precautions against flooding.

    3. 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.

    4. Construction and property management practitioners should make sure that overhanging facilities and temporary structures outdoors are securely fastened or placed on the ground, and complete precautionary measures as soon as possible.

    5. Small vessels not yet in typhoon shelters should seek shelter without delay. Use heavy anchors and check that all deck fittings are firmly fastened.

    6. Listen to radio, watch TV or browse the Hong Kong Observatory's website and mobile app for the latest information on the tropical cyclone.
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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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    South China Coastal Waters |  Marine Forecast
    Severe Weather Information Centre

    Bulletin issued at 21:30 HKT 15/Sep/2018


    Tropical Cyclone Warning

    At 151200 UTC, Super Typhoon Mangkhut (1822) with central pressure 940 hectopascals was centred within 30 nautical miles of one nine point three degrees north (19.3 N) one one eight point three degrees east (118.3 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 105 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 75 nautical miles.
    Radius of over 2 metre waves 330 nautical miles.

    Forecast position and intensity at 161200 UTC
    Two two point one degrees north (22.1 N)
    One one one point seven degrees east (111.7 E)
    Maximum winds 90 knots.

    Forecast position and intensity at 171200 UTC
    Two three point five degrees north (23.5 N)
    One zero five point eight degrees east (105.8 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 181200 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 15/Sep/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.7 C
Minimum Air Temperature                     26.7 C
Grass Minimum Temperature                   25.8 C
Relative Humidity                        69 - 88 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          1676.2 mm
Against an average of                     2076.9 mm

Other Stations                Min                  Max
King's Park                  26.2 C               32.2 C
Wong Chuk Hang               26.3 C               31.8 C
Ta Kwu Ling                  24.3 C               34.8 C
Lau Fau Shan                 24.7 C               31.7 C
Tai Po                       25.4 C               31.8 C
Sha Tin                      25.5 C               33.5 C
Tuen Mun                     25.7 C               32.5 C
Tseung Kwan O                25.1 C               33.1 C
Sai Kung                     25.9 C               31.3 C
Cheung Chau                  25.5 C               30.8 C
Chek Lap Kok                 26.3 C               33.8 C
Tsing Yi                     25.7 C               32.4 C
Shek Kong                    24.8 C               33.3 C
Tsuen Wan Ho Koon            24.3 C               30.8 C
Tsuen Wan Shing Mun Valley   24.8 C               33.7 C
Hong Kong Park               25.9 C               31.5 C
Shau Kei Wan                 25.8 C               31.9 C
Kowloon City                 26.3 C               33.5 C
Happy Valley                 26.1 C               33.5 C
Wong Tai Sin                 26.8 C               33.3 C
Stanley                      26.3 C               31.7 C
Kwun Tong                    26.3 C               32.5 C
Sham Shui Po                 26.2 C               33.7 C
Kai Tak Runway Park          26.7 C               32.3 C
Yuen Long Park               24.5 C               34.4 C
Tai Mei Tuk               25.6 C               32.6 C

Duration of sunshine (King's Park):              7.0 H
The mean UV index recorded at King's Park yesterday was 3,
the UV intensity was Moderate.
The maximum UV index for yesterday was 9.
Sea surface temperature (Waglan Island):        27.3 C 

Yesterday's (14 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                         0.11
Sha Tau Kok                         0.10
Kwun Tong                           0.12
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 14 Sep
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