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Bulletin issued at 06:02 HKT 15/Sep/2018

At 6 a.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 86 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 1 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 27 degrees;
Wong Chuk Hang 25 degrees;
Ta Kwu Ling 24 degrees;
Lau Fau Shan 26 degrees;
Tai Po 26 degrees;
Sha Tin 25 degrees;
Tuen Mun 25 degrees;
Tseung Kwan O 25 degrees;
Sai Kung 26 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 27 degrees;
Tsing Yi 27 degrees;
Shek Kong 25 degrees;
Tsuen Wan Ho Koon 26 degrees;
Tsuen Wan Shing Mun Valley 24 degrees;
Hong Kong Park 26 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 27 degrees;
Happy Valley 26 degrees;
Wong Tai Sin 26 degrees;
Stanley 25 degrees;
Kwun Tong 27 degrees;
Sham Shui Po 26 degrees;
Kai Tak Runway Park 27 degrees;
Yuen Long Park 25 degrees;
Tai Mei Tuk 26 degrees.

Here is the information on Super Typhoon Mangkhut:
Location: 18.0 degrees north, 121.1 degrees east; Maximum sustained wind near its centre: 220 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 05:45 HKT 15/Sep/2018

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

Weather forecast for today

Mainly fine and very hot but hazy. The maximum temperature will be about 35 degrees. A few showers and thunderstorms later. Light to moderate northeasterly winds, strengthening later. Seas will be rough with swells.

Outlook : Weather will be adverse with storm surge tomorrow. Seas will be high. Winds will moderate gradually later on Monday but there will still be heavy squally showers.


(The above forecast period is valid up to 23:59 HKT today, 15/09/2018; 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 14/Sep/2018

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

GENERAL SITUATION AT 140900 UTC:
FOR DETAILS ON SUPER TYPHOON MANGKHUT (1822), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 141300 UTC:

HONG KONG= NE 4-5, 6-7 LATER. DOWN TO 4000 M IN HAZE. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS LATER. SEA UP TO 2 M, 3-4 M LATER. SWELL E 2-3 M. TEMP 27-35 C. =
KWANGTUNG= NE 5-6, 10-11 IN E LATER. DOWN TO 500 M IN FREQ SQUALLY SHOWERS AND TS LATER. SEA 2-3 M, 10-12 M IN E LATER. SWELL E 3 M, 5-7 M IN E. =
TAIWAN STRAIT= NE 6-7, 8 IN S LATER. DOWN TO 500 M IN SQUALLY SHOWERS AND TS LATER. SEA 3-4 M, 6 M IN S LATER. SWELL E 3 M IN S. =
BASHI= E TO NE 8-9, 12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, 14 M LATER. SWELL E 5-7 M. =
PRATAS= NE 5-6, 12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M, 14 M LATER. SWELL E 5-7 M. =
BALINTANG= E TO NE 12, CYCLONIC 12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 14 M. SWELL E 5-7 M. =
SCARBOROUGH= N TO NE 7-8, 12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, 14 M LATER. SWELL E TO NE 5-7 M. =
PARACEL= N TO NE 4-5, 8-9 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS LATER. SEA UP TO 2 M, 6-8 M LATER. SWELL E 3 M. =
TONKIN= N TO NE 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
DANANG= N TO NE 4-5. ISOL SHOWERS. SEA UP TO 2 M. SWELL E 2 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 05:30 HKT 15/Sep/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 15 September 2018

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

    Weather Situation:
    At 5 a.m., Super Typhoon Mangkhut with maximum sustained winds of about 230 kilometres per hour near its centre was located at 18.0 degrees north, 121.3 degrees east. It is forecast to move northwest or west-northwest at about 30 kilometres per hour across the northern part of Luzon and enter the South China Sea.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Northeast force 5 to 6, becoming force 10 to 11 later.
    Hazy, isolated squally showers and thunderstorms later.
    Moderate to rough seas, becoming high to very high later.

    Nan'ao and Shanwei:
    Northeast force 6 to 7, becoming force 12 later.
    Frequent heavy squally showers and thunderstorms later.
    Rough seas, becoming phenomenal later.

    South of Hong Kong:
    Northeast force 5 to 6, becoming force 12 later.
    Frequent heavy squally showers and thunderstorms later.
    Moderate to rough seas, becoming phenomenal later.

    Shangchuan Dao:
    Northeast force 4 to 5, force 8 to 9 later.
    Heavy squally showers and thunderstorms later.
    Moderate seas, becoming very rough to high later.

    Outlook for the next 48 hours
    Northeasterly winds of force 10 to 11, up to force 12 in east, becoming cyclonic winds of force 12. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind west-northwest force 1
      Visibility 18 Kilometres

    Shantou Wind west force 1
      Visibility 30 Kilometres

    Dongsha Wind north-northeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind northwest force 3

    Macau Wind west-southwest force 1
      Visibility 15 Kilometres

    Xisha Wind east-northeast force 2
      Visibility 21 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 01:30 HKT 15/SEP/2018
    (Next update at 9:00-9:30 HKT 15/SEP/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 1 A.M., SUPER TYPHOON MANGKHUT WAS CENTRED
     NEAR 17.9 DEGREES NORTH, 122.7 DEGREES EAST AND
     IS FORECAST TO MOVE NORTHWEST OR WEST-NORTHWEST
     AT ABOUT 15 KNOTS TOWARDS THE NORTHERN PART OF
     LUZON AND ENTER THE SOUTH CHINA SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  010/5-10
       OFFSHORE:  010/10-15                            27-35
   B.   2000 FT:  030/10
                  BEC 020/20                           25
   C.   5000 FT:  040/20                               20
   D.  10000 FT:  060/25                               13
   E.  18000 FT:  060/30                               MS3
   F.  24000 FT:  070/35                               MS12
   G.  30000 FT:  080/30                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE. LOCALISED HAZE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT.
   K. VISIBILITY    : 10 KM. TEMPO 4000 M IN HAZE.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD NEAR HILLS
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTH TO NORTHEASTERLY WINDS
     AT FIRST, UP TO STRONG LATER. MAINLY FINE APART
     FROM ISOLATED SHOWERS AND THUNDERSTORMS.
     LOCALISED HAZE.=

    ===================================================================
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 17:32 HKT on 13 Sep 18

    VHHK SIGMET 2 VALID 130540/130940 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2124 E11636 - N2000 E11600 - N2048 E11130 - N2130 E11130 - N2206 E11254 - N2124 E11636 TOP FL400 MOV WNW 10KT NC= VHHK SIGMET 3 VALID 130940/131340 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1954 E11636 - N1830 E11530 - N2018 E11342 - N1930 E11130 - N2118 E11130 - N2200 E11506 - N1954 E11636 TOP FL400 MOV WNW 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 05:45 HKT 15/Sep/2018

    Tropical Cyclone Warning Bulletin

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

    The Standby Signal, No. 1 is in force.

    This means that a tropical cyclone will come within 800 kilometres of Hong Kong and may affect us.

    At 6 a.m., Super Typhoon Mangkhut was estimated to be about 870 kilometres east-southeast of Hong Kong (near 18.0 degrees north 121.1 degrees east) and is forecast to move northwest or west-northwest at about 30 kilometres per hour across the northern part of Luzon and enter the South China Sea.
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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 06:30 HKT 15/Sep/2018


    Tropical Cyclone Warning

    At 142100 UTC, the super typhoon Mangkhut (1822) with central pressure 915 hectopascals was centred within 30 nautical miles of one eight point zero degrees north (18.0 N) one two one point three degrees east (121.3 E) and is forecast to move northwest or west-northwest at about 16 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 125 knots.

    Radius of over 33 knot winds 270 nautical miles.
    Radius of over 47 knot winds 150 nautical miles.
    Radius of over 63 knot winds 90 nautical miles.
    Radius of over 2 metre waves 360 nautical miles.

    Forecast position and intensity at 152100 UTC
    Two zero point two degrees north (20.2 N)
    One one five point seven degrees east (115.7 E)
    Maximum winds 115 knots.

    Forecast position and intensity at 162100 UTC
    Two two point zero degrees north (22.0 N)
    One zero nine point zero degrees east (109.0 E)
    Maximum winds 80 knots.

    Forecast position and intensity at 172100 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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