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Bulletin issued at 19:02 HKT 24/Jul/2018

At 7 p.m. at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 80 per cent.

The air temperatures at other places were:

King's Park 29 degrees;
Wong Chuk Hang 29 degrees;
Ta Kwu Ling 29 degrees;
Lau Fau Shan 28 degrees;
Tai Po 29 degrees;
Sha Tin 29 degrees;
Tuen Mun 29 degrees;
Tseung Kwan O 28 degrees;
Sai Kung 29 degrees;
Cheung Chau 28 degrees;
Chek Lap Kok 29 degrees;
Tsing Yi 30 degrees;
Shek Kong 30 degrees;
Tsuen Wan Ho Koon 28 degrees;
Tsuen Wan Shing Mun Valley 29 degrees;
Hong Kong Park 29 degrees;
Shau Kei Wan 29 degrees;
Kowloon City 29 degrees;
Happy Valley 30 degrees;
Wong Tai Sin 29 degrees;
Stanley 29 degrees;
Kwun Tong 29 degrees;
Sham Shui Po 30 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 29 degrees;
Tai Mei Tuk 27 degrees.

Between 5:45 and 6:45 p.m., the rainfall recorded in various regions were:

Sha Tin 0 to 7 mm;
Tai Po 0 to 2 mm;
Sai Kung 0 to 1 mm.


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


Climatological Information for 24 Jul

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 18:45 HKT 24/Jul/2018

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

Showers are affecting the coast of Guangdong and the northern part of the South China Sea. Locally, more than 5 millimetres of rainfall were recorded over many places from midnight to 4 p.m., and rainfall even exceeded 20 millimetres over the western part of the New Territories.

At 4 p.m., the tropical depression over Guangxi was centred about 50 kilometres east-southeast of Nanning. It is forecast to move west-northwest at about 16 kilometres per hour further inland and weaken gradually.

Weather forecast for tonight and tomorrow

Mainly cloudy with a few showers. Isolated thunderstorms at first. Sunny intervals tomorrow afternoon. Temperatures will range between 27 and 31 degrees. Moderate southeasterly winds, occasionally fresh offshore at first.

Outlook : Sunny periods and a few showers in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 25/07/2018; 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 24/Jul/2018

N0 WARNING.

GENERAL SITUATION AT 232100 UTC:
FOR DETAILS ON THE TROPICAL DEPRESSION NEAR ZHANJIANG, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 240100 UTC:

HONG KONG= S TO SE 4-5, 6 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M, 3 M AT FIRST. SWELL S TO SW UP TO 2 M. TEMP 30-26 C. =
KWANGTUNG= S TO SE 5-6, 7 IN W AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, 4 M IN W AT FIRST. SWELL S TO SW 2 M, 3 M IN W. =
TAIWAN STRAIT= S TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL SW UP TO 2 M. =
BASHI= S TO SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL SW 2 M. =
PRATAS= S TO SE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SW 2-3 M. =
BALINTANG= S TO SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL SW 2 M. =
SCARBOROUGH= S TO SW 4-5, 6 AT FIRST. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M, 3 M AT FIRST. SWELL S TO SW 2-3 M. =
PARACEL= S TO SW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S TO SW 2-3 M. =
TONKIN= S TO SW 5-6. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL N TO NE 2 M. =
DANANG= S TO SW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S TO 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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    South China Coastal Waters

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    Bulletin issued at 19:30 HKT 24/Jul/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 24 July 2018

    Weather Situation:
    At 7 p.m., the tropical depression over Guangxi with maximum sustained winds of about 45 kilometres per hour near its centre was located near 23.1 degrees north, 108.1 degrees east. It is forecast to move west-northwest at about 16 kilometres per hour further inland and weaken gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South to southeast force 4 to 5.
    Isolated squally showers and thunderstorms.
    Moderate seas.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    South to southeast force 4 to 5.
    Isolated squally showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    South to southeasterly winds of force 4 to 5. Isolated squally showers and thunderstorms.

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

    Waglan Island Wind southeast force 5
      Visibility 12 Kilometres

    Shantou Wind west-southwest force 1
      Visibility 30 Kilometres

    Dongsha Wind south force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind south force 5

    Macau Wind south-southeast force 3
      Visibility 9 Kilometres

    Xisha Wind south-southwest force 4
      Visibility 13 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 24/JUL/2018
    (Next update at 01:30 HKT 25/JUL/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     SHOWERS ARE AFFECTING THE COAST OF GUANGDONG AND
     THE NORTHERN PART OF THE SOUTH CHINA SEA.
     AT 4 P.M., THE TROPICAL DEPRESSION OVER GUANGXI
     WAS CENTRED NEAR 22.7 DEGREES NORTH, 108.8
     DEGREES EAST.  IT IS FORECAST TO MOVE
     WEST-NORTHWEST AT ABOUT 9 KNOTS FURTHER INLAND
     AND WEAKEN GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  140/10-15
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  140/15-20                            30-27
   B.   2000 FT:  160/20-25                            23
   C.   5000 FT:  170/25                               19
   D.  10000 FT:  170/25                               12
   E.  18000 FT:  170/20                               MS1
   F.  24000 FT:  140/15                               MS12
   G.  30000 FT:  070/15                               MS24
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS AND ISOLATED
      SQUALLY THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 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: 18500 FT      10 DEG. C LEVEL(S) : 12400 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS, 
                      OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 2.0-3.0 M     SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTHEASTERLY WINDS.  MAINLY CLOUDY
     WITH A FEW SHOWERS AND ISOLATED 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 18:45 HKT on 24 Jul 18

    VHHK SIGMET 2 VALID 240645/241045 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2142 E11730 - N2136 E11454 - N1948 E11130 - N2130 E11130 - N2400 E11730 - N2142 E11730 TOP FL400 MOV N 10KT NC= VHHK SIGMET 3 VALID 241045/241445 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1930 E11130 - N2130 E11130 - N2212 E11306 - N1930 E11130 TOP FL400 MOV N 10KT 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

    Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
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    Bulletin issued at 12:30 HKT 24/Jul/2018


    Tropical Cyclone Warning

    At 240300 UTC, the tropical depression over Guangxi with central pressure 996 hectopascals was centred within 60 nautical miles of two two point three degrees north (22.3 N) one zero nine point six degrees east (109.6 E) and is forecast to move northwest at about 10 knots for the next 24 hours.

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

    Radius of over 2 metre waves 90 nautical miles.

    No further warnings on this Tropical Depression will be issued by the Hong Kong Observatory unless re-intensification takes place.

    Forecast position and intensity at 250300 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 24/Jul/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.2 C
Minimum Air Temperature                     26.3 C
Grass Minimum Temperature                   26.5 C
Relative Humidity                        75 - 95 Percent
Rainfall                                    30.8 mm 
Total rainfall since 1st January           965.1 mm
Against an average of                     1390.6 mm

Other Stations                Min                  Max
King's Park                  25.5 C               30.1 C
Wong Chuk Hang               25.3 C               30.7 C
Ta Kwu Ling                  25.2 C               32.4 C
Lau Fau Shan                 24.9 C               31.4 C
Tai Po                       26.3 C               30.8 C
Sha Tin                      26.2 C               31.2 C
Tuen Mun                     25.8 C               31.9 C
Tseung Kwan O                25.5 C               31.6 C
Sai Kung                     26.6 C               30.6 C
Cheung Chau                  25.3 C               30.8 C
Chek Lap Kok                 26.4 C               32.4 C
Shek Kong                    26.3 C               33.3 C
Tsuen Wan Ho Koon            24.8 C               29.7 C
Tsuen Wan Shing Mun Valley   25.6 C               31.3 C
Hong Kong Park               24.8 C               31.3 C
Shau Kei Wan                 24.9 C               30.8 C
Kowloon City                 25.5 C               31.2 C
Happy Valley                 25.8 C               32.2 C
Wong Tai Sin                 25.9 C               31.5 C
Stanley                      25.2 C               31.4 C
Kwun Tong                    25.6 C               30.6 C
Sham Shui Po                 25.5 C               31.6 C
Kai Tak Runway Park          25.7 C               30.4 C
Yuen Long Park               25.6 C               32.7 C
Tai Mei Tuk               26.1 C               31.7 C

Duration of sunshine (King's Park):              1.0 H
The mean UV index recorded at King's Park yesterday was 2,
the UV intensity was Low.
The maximum UV index for yesterday was 7.
 

Yesterday's (23 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                             0.09
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 23 Jul
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