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Bulletin issued at 18:02 HKT 25/Jul/2017

At 6 p.m. at the Hong Kong Observatory the air temperature was 31 degrees Celsius and the relative humidity 70 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.9. The intensity of UV radiation was low.

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 32 degrees;
Ta Kwu Ling 32 degrees;
Lau Fau Shan 31 degrees;
Tai Po 31 degrees;
Sha Tin 31 degrees;
Tuen Mun 30 degrees;
Tseung Kwan O 29 degrees;
Sai Kung 30 degrees;
Cheung Chau 29 degrees;
Chek Lap Kok 32 degrees;
Tsing Yi 32 degrees;
Shek Kong 32 degrees;
Tsuen Wan Ho Koon 30 degrees;
Tsuen Wan Shing Mun Valley 31 degrees;
Hong Kong Park 30 degrees;
Shau Kei Wan 29 degrees;
Kowloon City 30 degrees;
Happy Valley 32 degrees;
Wong Tai Sin 31 degrees;
Stanley 30 degrees;
Kwun Tong 30 degrees;
Sham Shui Po 32 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 31 degrees;
Tai Mei Tuk 29 degrees.

Here is the information on Tropical Storm Sonca at 4 p.m.:
Location: 17.3 degrees north, 107.6 degrees east.


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


Climatological Information for 25 Jul

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 17:45 HKT 25/Jul/2017

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

The subtropical ridge is covering southeastern China. Locally, it was very hot in the afternoon. Temperatures over most parts of the territory rose to around 33 degrees.

At 4 p.m., Tropical Storm Sonca was centred about 150 kilometres north-northwest of Da Nang. It is forecast to move west at about 18 kilometres per hour towards Vietnam.

Weather forecast for tonight and tomorrow

Mainly fine apart from isolated showers. The minimum temperature will be about 28 degrees. Very hot during the day with a maximum temperature of around 33 degrees. Moderate easterly winds.

Outlook : A few showers in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 26/07/2017; 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 25/Jul/2017

GALE WARNING AREAS: TONKIN AND DANANG.

GENERAL SITUATION AT 242100 UTC:
FOR DETAILS ON TROPICAL STORM SONCA (1708), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 250100 UTC:

HONG KONG= E TO SE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL E TO SE 2 M. TEMP 32-28 C. =
KWANGTUNG= E TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E TO SE 2-3 M. =
TAIWAN STRAIT= S 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL SE 2 M. =
BASHI= SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL E TO SE 2 M. =
PRATAS= E TO SE 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SE 2-3 M. =
BALINTANG= S TO SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL E TO SE 2 M. =
SCARBOROUGH= S 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SE 2-3 M. =
PARACEL= SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SE 2-3 M. =
TONKIN= NW 6-7, BEC CYCLONIC 8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, BEC 6 M. SWELL SE 2-3 M. =
DANANG= CYCLONIC 8, BEC SE 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6 M, BEC 3-4 M. SWELL SE 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.


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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 16:30 HKT 25/Jul/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 25 July 2017

    Warnings:
    Strong winds in Nan'ao, Shanwei, south of Hong Kong and Shangchuan Dao.

    Weather Situation:
    At 4 p.m., Tropical Storm Sonca with maximum sustained winds of about 75 kilometres per hour near its centre was located at 17.3 degrees north, 107.6 degrees east. It is forecast to move west at about 18 kilometres per hour towards Vietnam.

    Area forecasts for the next 24 hours

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

    Nan'ao, Shanwei and South of Hong Kong:
    East to southeast force 4 to 5, occasionally force 6.
    Isolated showers and thunderstorms.
    Moderate to rough seas.

    Shangchuan Dao:
    East to southeast force 4 to 5, occasionally force 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    Easterly winds of force 4 to 5, occasionally force 6 . Scattered squally showers and thunderstorms.

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

    Waglan Island Wind east force 3
      Visibility 32 Kilometres

    Shantou Wind south force 2
      Visibility 30 Kilometres

    Dongsha Wind east force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind east-northeast force 4

    Macau Wind east force 2
      Visibility 35 Kilometres

    Xisha Wind south-southeast force 1
      Visibility 30 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 25/JUL/2017
    (Next update at 01:30 HKT 26/JUL/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE SUBTROPICAL RIDGE IS COVERING SOUTHEASTERN
     CHINA.
     AT 4 P.M., TROPICAL STORM SONCA WAS CENTRED NEAR
     17.3 DEGREES NORTH, 107.6 DEGREES EAST.  IT IS
     FORECAST TO MOVE WEST AT ABOUT 10 KNOTS TOWARDS
     VIETNAM.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  100/5-10
       OFFSHORE:  100/15                               31-28
   B.   2000 FT:  120/15                               24
   C.   5000 FT:  100/15                               21
   D.  10000 FT:  090/15                               13
   E.  18000 FT:  070/20                               MS2
   F.  24000 FT:  090/20                               MS12
   G.  30000 FT:  090/25                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE APART FROM ISOLATED SHOWERS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT.
   K. VISIBILITY    : 10 KM.  TEMPO 4000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 12000 FT
   M. TURBULENCE    : MOD OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 1.5 M         SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE EASTERLY WINDS.  MAINLY FINE APART FROM
     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.

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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 03:30 HKT on 24 Jul 17

    VHHK SIGMET 7 VALID 231530/231930 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2148 E11218 - N2230 E11342 - N2254 E11500 - N2130 E11500 - N2130 E11218 - N2148 E11218 TOP FL400 MOV NW 10 KT WKN= VHHK SIGMET 8 VALID 231930/232230 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2148 E11212 - N2224 E11336 - N2242 E11424 - N2312 E11600 - N2200 E11518 - N2124 E11348 - N2148 E11212 TOP FL400 MOV NW 10 KT WKN=

    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.

    The latest report on Tropical Cyclone Roke broadcast by Miss LEE SHUK MING , Senior Scientific Officer of the Hong Kong Observatory at 6:23 p.m. on 23 Jul 2017.
    Listen Listen

    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 18:30 HKT 25/Jul/2017


    Tropical Cyclone Warning

    At 250900 UTC, Tropical Storm Sonca (1708) with central pressure 992 hectopascals was centred within 90 nautical miles of one seven point one degrees north (17.1 N) one zero seven point two degrees east (107.2 E) and is forecast to move west at about 10 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 40 knots.

    Radius of over 33 knot winds 45 nautical miles.
    Radius of over 2 metre waves 90 nautical miles.

    Forecast position and intensity at 260900 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 25/Jul/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.2 C
Minimum Air Temperature                     25.8 C
Grass Minimum Temperature                   25.1 C
Relative Humidity                        77 - 98 Percent
Rainfall                                     3.3 mm 
Total rainfall since 1st January          1759.8 mm
Against an average of                     1398.6 mm

Other Stations                Min                  Max
King's Park                  25.5 C               30.9 C
Wong Chuk Hang               25.6 C               31.0 C
Ta Kwu Ling                  25.3 C               31.5 C
Lau Fau Shan                 24.9 C               29.7 C
Tai Po                       25.3 C               28.8 C
Sha Tin                      25.9 C               31.5 C
Tuen Mun                     25.4 C               30.7 C
Tseung Kwan O                25.1 C               30.3 C
Sai Kung                     25.6 C               30.4 C
Cheung Chau                  25.2 C               29.6 C
Chek Lap Kok                 26.2 C               32.6 C
Tsing Yi                     25.4 C               31.9 C
Shek Kong                    25.4 C               31.2 C
Tsuen Wan Ho Koon            24.7 C               30.3 C
Tsuen Wan Shing Mun Valley   25.1 C               30.7 C
Hong Kong Park               25.3 C               30.8 C
Shau Kei Wan                 25.3 C               30.1 C
Kowloon City                 25.5 C               31.0 C
Happy Valley                 25.6 C               32.1 C
Wong Tai Sin                 25.2 C               31.6 C
Stanley                      25.3 C               31.0 C
Kwun Tong                    25.8 C               30.1 C
Sham Shui Po                 25.8 C               31.9 C
Kai Tak Runway Park          26.1 C               30.5 C
Yuen Long Park               25.2 C               31.8 C
Tai Mei Tuk               25.1 C               29.7 C

Duration of sunshine (King's Park):              4.6 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.
Sea surface temperature (Waglan Island):        // C 

Yesterday's (24 Jul 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.07 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                           0.07
Tap Mun                             0.08
Kat O                               0.08
Yuen Ng Fan                         0.11
Tai Mei Tuk                         0.11
Sha Tau Kok                         0.10
Kwun Tong                           0.11
Sai Wan Ho                          0.09
King's Park                         0.14
Tsim Bei Tsui                       0.12
Cape D'Aguilar                      0.12
Chek Lap Kok                        0.14

Note

      

    1. From readings taken at various locations in Hong Kong during
the period 1987-2016, the background ambient gamma radiation
levels may vary between 0.06 and 0.30 microsievert per hour.

    2. The extent of health effects to a person as a result of
exposure to radiation is expressed by a physical quantity
called equivalent dose, in unit of sievert.  Protective
action may be required if there is an increase in the
ambient gamma dose rate above background such that the total
additional dose is expected to exceed 5000 microsieverts in
a relatively short period of time. For example, a dose of
5000 microsieverts may be reached when the ambient gamma
dose rate is 1000 microsieverts per hour (several thousand
times above background) and lasts for 5 hours.

    3. The readings of ambient gamma radiation level from
instrument are expressed in unit of gray, which is
numerically equal to the gamma dose expressed in sievert.
    Climatological Information for 24 Jul
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