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Bulletin issued at 05:02 HKT 24/Jul/2017

At 5 a.m. at the Hong Kong Observatory the air temperature was 26 degrees Celsius and the relative humidity 97 per cent.

The air temperatures at other places were:

King's Park 26 degrees;
Wong Chuk Hang 26 degrees;
Ta Kwu Ling 25 degrees;
Lau Fau Shan 25 degrees;
Tai Po 25 degrees;
Sha Tin 26 degrees;
Tuen Mun 26 degrees;
Tseung Kwan O 25 degrees;
Sai Kung 26 degrees;
Cheung Chau 25 degrees;
Chek Lap Kok 27 degrees;
Tsing Yi 25 degrees;
Shek Kong 26 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 25 degrees;
Hong Kong Park 25 degrees;
Shau Kei Wan 26 degrees;
Kowloon City 26 degrees;
Happy Valley 26 degrees;
Wong Tai Sin 25 degrees;
Stanley 26 degrees;
Kwun Tong 26 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 Tropical Depression Sonca at 5 a.m.:
Location: 17.3 degrees north, 111.4 degrees east.


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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Bulletin updated at 04:45 HKT 24/Jul/2017

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.

At 5 a.m., Tropical Depression Sonca was centred about 220 east-southeast of Sanya. It is forecast to move west-northwest slowly towards the vicinity of Hainan Island to Beibu Wan.

Weather forecast for today

Mainly cloudy with a few showers. Isolated thunderstorms at first. Sunny intervals during the day. The maximum temperature will be about 31 degrees. Moderate east to southeasterly winds.

Outlook : Becoming fine and very hot in the next couple of days.


(The above forecast period is valid up to 23:59 HKT today, 24/07/2017; 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 21:00 HKT 23/Jul/2017

N0 WARNING.

GENERAL SITUATION AT 230900 UTC:
FOR DETAILS ON TROPICAL DEPRESSION ROKE (1707) AND TROPICAL DEPRESSION SONCA (1708), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 231300 UTC:

HONG KONG= E TO SE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO SE 2-3 M. TEMP 27-31 C. =
KWANGTUNG= SE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO SE 2-3 M. =
TAIWAN STRAIT= SE 5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SE 2 M. =
BASHI= SE 5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL E TO SE 2-3 M. =
PRATAS= SE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO SE 2-3 M. =
BALINTANG= SE 5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL E TO SE 2-3 M. =
SCARBOROUGH= S TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SE 2-3 M. =
PARACEL= CYCLONIC 7, SE 6-7 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO SE 2-3 M. =
TONKIN= NW 5-6. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SE 2-3 M. =
DANANG= CYCLONIC 7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4 M. SWELL E TO 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 05:30 HKT 24/Jul/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 24 July 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    At 5 a.m., Tropical Depression Sonca with maximum sustained winds of about 55 kilometres per hour near its centre was located at 17.3 degrees north, 111.4 degrees east, it is forecast to move west-northwest slowly towards the vicinity of Hainan Island to Beibu Wan.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to southeast force 6.
    Scattered squally showers and thunderstorms.
    Rough to very rough seas.

    Nan'ao and Shanwei:
    Southeast force 6.
    Scattered squally showers and thunderstorms.
    Rough to very rough seas.

    South of Hong Kong:
    Southeast force 6 to 7.
    Scattered squally showers and thunderstorms.
    Rough to very rough seas.

    Shangchuan Dao:
    Southeast force 6 to 7.
    Occasional squally showers and thunderstorms.
    Rough to very rough seas.

    Outlook for the next 48 hours
    Southeasterly winds of force 5 to 6. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind east force 3
      Visibility 27 Kilometres

    Shantou Wind east force 1
      Visibility 30 Kilometres

    Dongsha Wind south-southeast force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 3

    Macau Wind north-northeast force 2
      Visibility 6 Kilometres

    Xisha Wind south-southwest force 4
      Visibility 14 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 24/JUL/2017
    (Next update at 9:00-9:30 HKT 24/JUL/2017)
    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 :
     TROPICAL DEPRESSION ROKE HAS WEAKENED INTO AN
     AREA OF LOW PRESSURE OVER INLAND GUANGDONG. ITS
     REMNANTS ARE BRINGING SHOWERS TO THE COAST OF
     GUANGDONG. 
     AT 11 P.M. LAST NIGHT, TROPICAL DEPRESSION SONCA
     WAS CENTRED NEAR 17.6 DEGREES NORTH, 111.3
     DEGREES EAST. IT IS FORECAST TO MOVE NORTHWEST
     OR WEST-NORTHWEST SLOWLY TOWARDS HAINAN ISLAND.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  100/10-15
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  120/20-25                            25-31
   B.   2000 FT:  120/20                               23
   C.   5000 FT:  120/20                               19
   D.  10000 FT:  130/20                               13
   E.  18000 FT:  130/20                               MS1
   F.  24000 FT:  200/15                               MS10
   G.  30000 FT:  100/15                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH SHOWERS AND ISOLATED SQUALLY
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1000 FT  SCT 2500 FT.  TEMPO FEW CB 800 FT
      SCT 1500 FT  BKN 4000 FT.
   K. VISIBILITY    : 9 KM.  TEMPO 3000 M IN SHOWERS.  TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 12000 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS AND OFFSHORE. MOD NEAR HILL.
   N. SEA STATE     : 2.5-3.5 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EAST TO SOUTHEASTERLY WINDS.
     MAINLY CLOUDY WITH A FEW SHOWERS. SUNNY
     INTERVALS DURING THE DAY.=

    ===================================================================
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

    Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
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    Severe Weather Information Centre

    Bulletin issued at 03:31 HKT 24/Jul/2017


    Tropical Cyclone Warning

    At 231800 UTC, Tropical Depression Sonca (1708) with central pressure 998 hectopascals was centred within 60 nautical miles of one seven point two degrees north (17.2 N) one one one point four degrees east (111.4 E) and is forecast to move west-northwest slowly for the next 24 hours.

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

    Radius of over 2 metre waves 60 nautical miles.

    Forecast position and intensity at 241800 UTC
    One eight point one degrees north (18.1 N)
    One zero nine point six degrees east (109.6 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 251800 UTC
    One eight point five degrees north (18.5 N)
    One zero four point six degrees east (104.6 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 261800 UTC
    Dissipated over land.

    Bulletin issued at 21:30 HKT 23/Jul/2017


    Tropical Cyclone Warning

    At 231200 UTC, Tropical Depression Roke (1707) has weakened into an area of low pressure.

    No further warnings on this area of low pressure will be issued by the Hong Kong Observatory unless regeneration takes place.



    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/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.8 C
Minimum Air Temperature                     25.6 C
Grass Minimum Temperature                   25.1 C
Relative Humidity                        73 - 98 Percent
Rainfall                                    46.5 mm 
Total rainfall since 1st January          1756.5 mm
Against an average of                     1390.6 mm

Other Stations                Min                  Max
King's Park                  25.4 C               29.0 C
Wong Chuk Hang               25.7 C               29.3 C
Ta Kwu Ling                  25.2 C               27.8 C
Lau Fau Shan                 24.8 C               28.3 C
Tai Po                       25.0 C               28.0 C
Sha Tin                      25.8 C               29.2 C
Tuen Mun                     25.3 C               29.0 C
Tseung Kwan O                25.4 C               27.7 C
Sai Kung                     25.7 C               28.9 C
Cheung Chau                  24.6 C               27.3 C
Chek Lap Kok                 26.1 C               30.5 C
Tsing Yi                     25.5 C               29.3 C
Shek Kong                    25.2 C               28.5 C
Tsuen Wan Ho Koon            24.5 C               27.9 C
Tsuen Wan Shing Mun Valley   25.3 C               28.0 C
Hong Kong Park               25.3 C               28.7 C
Shau Kei Wan                 25.0 C               28.6 C
Kowloon City                 25.0 C               28.3 C
Happy Valley                 25.6 C               29.7 C
Wong Tai Sin                 25.3 C               28.8 C
Stanley                      25.2 C               28.9 C
Kwun Tong                    25.3 C               28.4 C
Sham Shui Po                 25.6 C               29.0 C
Kai Tak Runway Park          25.7 C               29.4 C
Yuen Long Park               25.3 C               29.0 C
Tai Mei Tuk               25.2 C               28.5 C

Duration of sunshine (King's Park):              0.1 H
The mean UV index recorded at King's Park yesterday was 1,
the UV intensity was Low.
The maximum UV index for yesterday was 5.
 

Yesterday's (23 Jul 2017) 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                             0.09
Kat O                               0.08
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.11
Sai Wan Ho                          0.09
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 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 23 Jul
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