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Bulletin issued at 00:02 HKT 22/Jul/2018

At midnight at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 81 per cent.

The air temperatures at other places were:

King's Park 28 degrees;
Wong Chuk Hang 27 degrees;
Ta Kwu Ling 25 degrees;
Lau Fau Shan 28 degrees;
Tai Po 28 degrees;
Sha Tin 29 degrees;
Tuen Mun 28 degrees;
Tseung Kwan O 26 degrees;
Sai Kung 28 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 29 degrees;
Tsing Yi 27 degrees;
Shek Kong 27 degrees;
Tsuen Wan Ho Koon 26 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 28 degrees;
Shau Kei Wan 28 degrees;
Kowloon City 28 degrees;
Happy Valley 28 degrees;
Wong Tai Sin 29 degrees;
Stanley 28 degrees;
Kwun Tong 29 degrees;
Sham Shui Po 28 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 27 degrees;
Tai Mei Tuk 28 degrees.

Here is the information on Tropical Depression at 11:00 p.m. yesterday:
Location: 19.1 degrees north, 121.4 degrees east.


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


Climatological Information for 22 Jul

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 00:00 HKT 22/Jul/2018

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

Under the influence of the subsiding air of Tropical Cyclone Ampil, the weather was very hot over southeastern China yesterday. An area of low pressure over Beibu Wan brought unsettled weather to the region. Locally, it was mainly fine and very hot apart from isolated showers and thunderstorms in the afternoon. There will be showers over the south China coast in the early and middle parts of this week.

The area of low pressure in the vicinity of Luzon intensified into a tropical depression yesterday. At 11 p.m. last night, the tropical depression was centred about 510 kilometres north of Manila. It is forecast to move northeast at about 25 kilometres per hour across the Luzon Strait. Meanwhile, Severe Tropical Storm Ampil was centred about 410 kilometres east-southeast of Shanghai. It is forecast to move northwest at about 30 kilometres per hour across the East China Sea towards the vicinity of Zhejiang to Jiangsu.

Weather forecast for Hong Kong (Sunday, 22 Jul 2018)

Mainly fine apart from isolated showers. Temperatures will range between 28 and 33 degrees. Very hot during the day. Light winds.

Outlook : More showers in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 22/07/2018; 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 21:00 HKT 21/Jul/2018

N0 WARNING.

GENERAL SITUATION AT 210900 UTC:
FOR DETAILS ON THE TROPICAL DEPRESSION IN THE VICINITY OF LUZON, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 211300 UTC:

HONG KONG= S TO SW 3-4. ISOL SHOWERS. TEMP 28-33 C. =
KWANGTUNG= S 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 CYCLONIC 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 2-4 M. SWELL SW 2-3 M. =
PRATAS= W TO NW 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 2 M. =
BALINTANG= CYCLONIC 6-7, BEC SW 6. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 2-3 M. =
SCARBOROUGH= SW 5-6, OCNL 7 AT FIRST. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 2-4 M. SWELL SW 2 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 TO SW 5-6, BEC E TO NE 5-6. DOWN TO 1000 M IN SCT HEAVY 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 2-4 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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    South China Coastal Waters

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    Bulletin issued at 23:30 HKT 21/Jul/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 21 July 2018

    Weather Situation:
    At 11 p.m., the tropical depression in the vicinity of Luzon with maximum sustained winds of about 55 kilometres per hour near its centre was located near 19.1 degrees north, 121.4 degrees east. It is forecast to move northeast at about 25 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 29.6 degrees north, 125.3 degrees east. It is forecast to move northwest at about 30 kilometres per hour across the East China Sea towards the vicinity of Zhejiang to JiangSu.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South to southwest force 3 to 4.
    Isolated showers.
    Slight to moderate seas.

    Nan'ao and Shanwei:
    West to northwest force 4 to 5.
    Moderate seas.

    South of Hong Kong and Shangchuan Dao:
    South to southwest force 4 to 5.
    Isolated squally 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 southwest force 3
      Visibility 34 Kilometres

    Shantou Wind southeast force 2
      Visibility 30 Kilometres

    Dongsha Wind north force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind west-southwest force 2

    Macau Wind south-southwest force 2
      Visibility 29 Kilometres

    Xisha Wind south-southwest force 2
      Visibility 18 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 17:30 HKT 21/JUL/2018
    (Next update at 01:30 HKT 22/JUL/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     CONVECTIVE ACTIVITIES ARE AFFECTING THE COAST
     OF GUANGDONG.
     AT 4 P.M., THE TROPICAL DEPRESSION IN THE
     VICINITY OF LUZON WAS CENTRED NEAR 18.9 DEGREES
     NORTH, 120.0 DEGREES EAST.  IT IS FORECAST TO
     MOVE EAST-NORTHEAST AT ABOUT 11 KNOTS ACROSS THE
     LUZON STRAIT.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  200/5-10
                  TEMPO VRB/15G25 IN TS                31-28
   B.   2000 FT:  180/10                               24
   C.   5000 FT:  360/10
                  BECMG 260/10                         20
   D.  10000 FT:  360/10
                  BECMG 140/10                         11
   E.  18000 FT:  080/10                               MS3
   F.  24000 FT:  020/10                               MS13
   G.  30000 FT:  020/10                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH ISOLATED SHOWERS. ISOLATED
      THUNDERSTORMS AT FIRST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT.  TEMPO FEW CB 1000 FT  SCT 2000 FT
      BKN 4000 FT.
   K. VISIBILITY    : 10 KM.  TEMPO 4000 M IN SHOWERS.  TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11000 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS.
   N. SEA STATE     : 0.5-1.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT TO MODERATE SOUTH TO SOUTHWESTLY 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 17:40 HKT on 21 Jul 18

    VHHK SIGMET 1 VALID 210940/211340 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2030 E11130 - N2000 E11300 - N1642 E11400 - N1930 E11130 - N2030 E11130 TOP FL420 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 00:30 HKT 22/Jul/2018


    Tropical Cyclone Warning

    At 211500 UTC, the tropical depression near Luzon with central pressure 996 hectopascals was centred within 90 nautical miles of one nine point one degrees north (19.1 N) one two one point four degrees east (121.4 E) and is forecast to move northeast at about 14 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 30 knots.

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

    Forecast position and intensity at 221500 UTC
    Two four point three degrees north (24.3 N)
    One two four point five degrees east (124.5 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 231500 UTC
    Dissipated over sea.



    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 22/Jul/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     33.1 C
Minimum Air Temperature                     27.4 C
Grass Minimum Temperature                   26.2 C
Relative Humidity                        59 - 88 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January           934.3 mm
Against an average of                     1347.0 mm

Other Stations                Min                  Max
King's Park                  26.6 C               32.6 C
Wong Chuk Hang               25.4 C               31.2 C
Ta Kwu Ling                  25.1 C               34.0 C
Lau Fau Shan                 25.7 C               32.2 C
Tai Po                       26.1 C               32.6 C
Sha Tin                      26.1 C               34.0 C
Tuen Mun                     25.9 C               32.3 C
Tseung Kwan O                25.5 C               33.7 C
Sai Kung                     26.5 C               33.2 C
Cheung Chau                  25.7 C               31.9 C
Chek Lap Kok                 26.7 C               33.8 C
Tsing Yi                     26.1 C               32.5 C
Shek Kong                    25.2 C               34.6 C
Tsuen Wan Ho Koon            24.5 C               30.8 C
Tsuen Wan Shing Mun Valley   24.9 C               32.8 C
Hong Kong Park               26.1 C               33.6 C
Shau Kei Wan                 26.3 C               32.3 C
Kowloon City                 26.7 C               33.3 C
Happy Valley                 26.0 C               33.6 C
Wong Tai Sin                 26.1 C               33.7 C
Stanley                      26.2 C               32.1 C
Kwun Tong                    26.5 C               33.0 C
Sham Shui Po                 26.8 C               33.3 C
Kai Tak Runway Park          27.1 C               32.1 C
Yuen Long Park               25.0 C               34.5 C
Tai Mei Tuk               26.3 C               33.7 C

Duration of sunshine (King's Park):              8.0 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 9.
 

Yesterday's (21 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                           0.09
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                      0.13
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 21 Jul
     2003copy right image | Important notices | Privacy policy Last revision date: <22 Jul 2018> 

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