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Bulletin issued at 12:36 HKT 21/Jul/2018

At noon at the Hong Kong Observatory the air temperature was 31 degrees Celsius and the relative humidity 62 per cent.
During the past hour the mean UV Index recorded at King's Park was 6. The intensity of UV radiation was high.

An area of low pressure to the west of Luzon has intensified into a tropical depression. It is located more than 600 kilometres from Hong Kong. According to the present forecast track, the tropical depression will move across the Luzon Strait towards the seas east of Taiwan today and tomorrow. It will not affect the weather in the territory.

Please be reminded that:

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

No rainfall was recorded at the Hong Kong Observatory between midnight last night and midday today.

Here is the information on Tropical Depression at noon:
Location: 18.2 degrees north, 119.4 degrees east.


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


Climatological Information for 21 Jul

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 11:45 HKT 21/Jul/2018

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

The weather is generally fine over southeastern China.

The area of low pressure to the west of Luzon has intensified into a tropical depression. At noon, the tropical depression was centred about 440 kilometres north-northwest of Manila. It is forecast to move east-northeast at about 20 kilometres per hour across the Luzon Strait. Meanwhile, Severe Tropical Storm Ampil was centred about 180 kilometres north-northwest of Okinawa. It is forecast to move northwest at about 30 kilometres per hour across the East China Sea.

Weather forecast for this afternoon and tonight

Mainly fine and very hot. Isolated showers later. Light winds.

Outlook : Mainly fine and very hot with isolated showers tomorrow. More showers in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 21/07/2018; 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 21/Jul/2018

N0 WARNING.

GENERAL SITUATION AT 202100 UTC:
LOW 1000 HPA 18N 118E ENE 12 KT INTSF

MARINE FORECAST FOR 24 HOURS FROM 210100 UTC:

HONG KONG= E TO NE 3-4, BEC W TO SW 3-4. ISOL SHOWERS AND TS. TEMP 33-28 C. =
KWANGTUNG= E TO NE 4-5, BEC W TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL SW 2 M. =
TAIWAN STRAIT= E TO NE 4-5, BEC W TO NW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
BASHI= E TO NE 5-6, BEC W TO NW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, BEC 4 M. SWELL SW 2-3 M. =
PRATAS= N TO NW 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 2 M. =
BALINTANG= E TO NE 5-6, BEC W TO NW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, BEC 4 M. SWELL SW 2-3 M. =
SCARBOROUGH= W TO SW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 2-3 M. =
PARACEL= S TO SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2-3 M. =
TONKIN= S 5-6, BEC E TO NE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. =
DANANG= S TO SW 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL SW 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.


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    • SOUTH CHINA COASTAL WATERS
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    Bulletin issued at 12:30 HKT 21/Jul/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 p.m. on 21 July 2018

    Weather Situation:
    The area of low pressure to the west of Luzon has intensified into a tropical depression. At noon, the tropical depression with maximum sustained winds of about 45 kilometres per hour near its centre was located near 18.2 degrees north, 119.4 degrees east. It is forecast to move east-northeast at about 20 kilometres per hour across the Luzon strait. Meanwhile, Severe Tropical Storm Ampil with maximum sustained winds of about 90 kilometres per hour near its centre was located near 27.7 degrees north, 127.1 degrees east. It is forecast to move northwest at about 30 kilometres per hour across the East China Sea.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to northeast force 3 to 4, becoming west to southwest force 3 to 4.
    Isolated showers.
    Slight to moderate seas.

    Nan'ao and Shanwei:
    East to northeast force 4 to 5, becoming west to northwest force 4 to 5.
    Isolated showers and thunderstorms.
    Moderate seas.

    South of Hong Kong and Shangchuan Dao:
    East to northeast force 4, becoming west to southwest force 4.
    Isolated showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    South to southwesterly winds of force 5 to 6, occasionally force 7. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind east force 1
      Visibility 43 Kilometres

    Shantou Wind west-northwest force 2
      Visibility 30 Kilometres

    Dongsha Wind north force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind north force 1

    Macau Wind north force 2
      Visibility 21 Kilometres

    Xisha Wind southwest 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 09:00 HKT 21/JUL/2018
    (Next update at 12:30 HKT 21/JUL/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE WEATHER IS GENERALLY FINE OVER SOUTHEASTERN
     CHINA.  MEANWHILE, AN AREA OF LOW PRESSURE TO
     THE WEST OF LUZON IS BRINGING UNSETTLED WEATHER
     TO THE REGION.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  VRB/5-10                             30-34
   B.   2000 FT:  040/10                               25
   C.   5000 FT:  040/10                               20
   D.  10000 FT:  040/10                               12
   E.  18000 FT:  070/10                               MS2
   F.  24000 FT:  080/15                               MS13
   G.  30000 FT:  070/15                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE AND ISOLATED SHOWERS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT.
   K. VISIBILITY    : 10 KM.  TEMPO 4000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11000 FT
   M. TURBULENCE    : NIL.
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT WINDS.  MAINLY FINE AND ISOLATED SHOWERS.=

    ===================================================================
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 00:50 HKT on 21 Jul 18

    VHHK SIGMET 4 VALID 201255/201655 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1806 E11312 - N1812 E11512 - N1642 E11400 - N1930 E11130 - N1954 E11130 - N1954 E11142 - N1806 E11312 TOP FL500 STNR NC= VHHK SIGMET 5 VALID 201655/202055 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1742 E11354 - N1724 E11436 - N1642 E11400 - N1830 E11224 - N1836 E11242 - N1742 E11354 TOP FL500 STNR NC=

    Please click here for more about the SIGMET

    Tropical Cyclone Warning
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    Tropical Cyclone Warning

    There is no tropical cyclone warning signal.

    For other tropical cyclone related information, please visit the World Meteorological Organization Web Site - Severe Weather Information Centre.

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    TROPICAL CYCLONE WARNING FOR SHIPPING
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    Tropical Cyclone Warning for Shipping

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    Bulletin issued at 12:30 HKT 21/Jul/2018


    Tropical Cyclone Warning

    The area of low pressure to the west of Luzon has intensified into a Tropical Depression with central pressure 998 hectopascals. At 210300 UTC, it was centred within 90 nautical miles of one eight point two degrees north (18.2 N) one one nine point two degrees east (119.2 E) and is forecast to move east-northeast at about 12 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 25 knots.

    Radius of over 2 metre waves 120 nautical miles over southern semicircle, 60 nautical miles elsewhere.

    Forecast position and intensity at 220300 UTC
    Two one point two degrees north (21.2 N)
    One two three point three degrees east (123.3 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 230300 UTC
    Two six point five degrees north (26.5 N)
    One two three point seven degrees east (123.7 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 240300 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 21/Jul/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.6 C
Minimum Air Temperature                     26.0 C
Grass Minimum Temperature                   25.6 C
Relative Humidity                        73 - 97 Percent
Rainfall                                     7.1 mm 
Total rainfall since 1st January           934.3 mm
Against an average of                     1333.8 mm

Other Stations                Min                  Max
King's Park                  25.7 C               30.8 C
Wong Chuk Hang               25.7 C               30.7 C
Ta Kwu Ling                  25.5 C               32.0 C
Lau Fau Shan                 25.1 C               31.5 C
Tai Po                       26.2 C               30.6 C
Sha Tin                      26.3 C               31.7 C
Tuen Mun                     25.5 C               31.1 C
Tseung Kwan O                25.8 C               30.8 C
Sai Kung                     26.9 C               30.3 C
Cheung Chau                  24.8 C               29.1 C
Chek Lap Kok                 26.5 C               33.3 C
Tsing Yi                     25.9 C               31.9 C
Shek Kong                    25.8 C               32.1 C
Tsuen Wan Ho Koon            24.6 C               30.6 C
Tsuen Wan Shing Mun Valley   25.6 C               31.0 C
Hong Kong Park               25.2 C               30.6 C
Shau Kei Wan                 25.0 C               30.2 C
Kowloon City                 25.7 C               31.6 C
Happy Valley                 26.4 C               31.9 C
Wong Tai Sin                 26.0 C               31.1 C
Stanley                      25.7 C               30.3 C
Kwun Tong                    25.9 C               30.8 C
Sham Shui Po                 25.9 C               32.7 C
Kai Tak Runway Park          26.1 C               30.1 C
Yuen Long Park               25.6 C               32.5 C
Tai Mei Tuk               25.5 C               31.4 C

Duration of sunshine (King's Park):              6.4 H
The mean UV index recorded at King's Park yesterday was 4,
the UV intensity was Moderate.
The maximum UV index for yesterday was 11.
 

Yesterday's (20 Jul 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                           0.08
Tap Mun                             0.08
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                      0.12
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 20 Jul
     2003copy right image | Important notices | Privacy policy Last revision date: <21 Jul 2018> 

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