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Bulletin issued at 19:02 HKT 30/Jul/2017

At 7 p.m. at the Hong Kong Observatory the air temperature was 33 degrees Celsius and the relative humidity 78 per cent.

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

Here is the information on Tropical Storm Haitang at 7 p.m.:
Location: 22.6 degrees north, 120.6 degrees east.


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


Climatological Information for 30 Jul

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 18:45 HKT 30/Jul/2017

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

A continental airstream is bringing very hot weather to the coast of Guangdong. Locally, the maximum temperature recorded at the Observatory in the afternoon was 34.8 degrees, the highest so far this year.

At 7 p.m., Tropical Storm Haitang was centred about 30 kilometres east of Gaoxiong. It is forecast to move north or north-northwest at about 28 kilometres per hour across Taiwan. Meanwhile, Tropical Strom Nesat was centred about 200 kilometres west of Fuzhou. It is forecast to move west-northwest slowly across inland Fujian and further weaken.

Weather forecast for tonight and tomorrow

Very hot and hazy at first. Becoming cloudy with a few showers and thunderstorms. Temperatures will range between 27 and 32 degrees tomorrow. Moderate to fresh west to southwesterly winds, occasionally strong offshore tomorrow.

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


(The above forecast period is valid up to 23:59 HKT tomorrow, 31/07/2017; 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 30/Jul/2017

HURRICANE WARNING AREA: TAIWAN STRAIT.
STORM WARNING AREA: KWANGTUNG.
GALE WARNING AREAS: BASHI, PRATAS, BALINTANG AND SCARBOROUGH.

GENERAL SITUATION AT 292100 UTC:
FOR DETAILS ON TROPICAL STORM HAITANG (1710) AND TYPHOON NESAT (1709), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 300100 UTC:

HONG KONG= W TO NW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. DOWN TO 4000 M IN SOME HAZE. SEA 2-3 M. SWELL SE UP TO 2 M. TEMP 34-27 C. =
KWANGTUNG= W TO SW 9-10, UP TO 11 IN E. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 8-10 M, UP TO 12 M IN E. SWELL SE 2-3 M, NE 3-5 M. =
TAIWAN STRAIT= CYCLONIC 11-12, 8-9 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 12-14 M, 6-8 M LATER. SWELL SW 5-7 M. =
BASHI= CYCLONIC 8, OCNL 9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 8 M. SWELL SW 5-7 M, SE 3-5 M. =
PRATAS= N TO NE 7-8, SW 8 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL SW 5 M, NE 5 M. =
BALINTANG= CYCLONIC 8, OCNL 9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 8 M. SWELL SW 5-7 M, SE 3-5 M. =
SCARBOROUGH= SW 7-8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL SW 3-5 M. =
PARACEL= W TO SW 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 2-3 M, NE 2-3 M. =
TONKIN= SW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SE UP TO 2 M. =
DANANG= W TO SW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S 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.


  • Map showing the 10 forecast areas
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    • SOUTH CHINA COASTAL WATERS
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    Bulletin issued at 19:30 HKT 30/Jul/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 30 July 2017

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

    Weather Situation:
    At 7 p.m., Tropical Storm Haitang with maximum sustained winds of about 75 kilometres per hour near its centre was located at 22.6 degrees north, 120.6 degrees east, it is forecast to move north or north-northwest at about 28 kilometres per hour across Taiwan. Meanwhile, Tropical Storm Nesat with maximum sustained winds of about 65 kilometres per hour near its centre was located at 25.9 degrees north, 117.3 degrees east, it is forecast to move west-northwest slowly across inland Fujian and further weaken.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    West to southwest force 5 to 6, occasionally force 7.
    Scattered squally showers and thunderstorms, some haze at first.
    Moderate to rough seas.

    Nan'ao:
    Southwest force 8 to 9.
    Frequent heavy squally showers and thunderstorms.
    High seas.

    Shanwei:
    Southwest force 7, occasionally force 8.
    Frequent heavy squally showers and thunderstorms.
    Very rough to high seas.

    South of Hong Kong and Shangchuan Dao:
    Southwest force 6 to 7.
    Occasional heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Outlook for the next 48 hours
    Southwesterly winds of force 6 to 7. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind west force 6
      Visibility 6 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 22 Kilometres

    Dongsha Wind west-southwest force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind west-southwest force 5

    Macau Wind west force 2
      Visibility 10 Kilometres

    Xisha Wind southwest force 4
      Visibility 11 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 30/JUL/2017
    (Next update at 01:30 HKT 31/JUL/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     NESAT HAS WEAKENED INTO A TROPICAL STORM. AT 4
     P.M., NESAT WAS CENTRED NEAR 25.9 DEGREES NORTH,
     117.8 DEGREES EAST, IT IS FORECAST TO MOVE
     WEST-NORTHWEST SLOWLY ACROSS INLAND FUJIAN AND
     FURTHER WEAKEN. MEANWHILE, TROPICAL STORM
     HAITANG WAS CENTRED NEAR 22.0 DEGREES NORTH,
     120.3 DEGREES EAST, IT IS FORECAST TO MOVE
     NORTH-NORTHEAST AT ABOUT 28 KILOMETRES PER HOUR
     TOWARDS TAIWAN.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  230/5-10
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  240/20                               35-29
   B.   2000 FT:  300/15-20                            27
   C.   5000 FT:  300/15                               22
   D.  10000 FT:  300/20                               13
   E.  18000 FT:  300/20                               MS1
   F.  24000 FT:  360/20                               MS10
   G.  30000 FT:  360/20                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH ISOLATED SHOWERS AND
      THUNDERSTORMS. LOCALISED HAZE AT FIRST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3500 FT. 
      TEMPO FEW CB 1000 FT SCT 2000 FT BKN 5000 FT.
   K. VISIBILITY    : 7 KM. TEMPO 3500 M IN SHOWERS/HAZE. 
                      TEMPO 2000 M IN THUNDERSTORMS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 12000 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS. 
                      MOD OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 1.5-2.5 M     SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH WEST TO SOUTHWESTERLY WINDS,
     OCCASIONALLY STRONG OFFSHORE.  MAINLY CLOUDY
     WITH A FEW SHOWERS AND 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.

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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 19:10 HKT on 30 Jul 17

    VHHK SIGMET 2 VALID 300720/301120 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1742 E11448 - N1906 E11318 - N2254 E11730 - N2100 E11730 TOP FL500 MOV NE 05KT NC= VHHK SIGMET 3 VALID 301120/301520 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2312 E11554 - N2342 E11730 - N2136 E11730 - N2118 E11624 - N2312 E11554 TOP FL450 MOV SE 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.

    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 18:31 HKT 30/Jul/2017


    Tropical Cyclone Warning

    At 300900 UTC, Tropical Storm Nesat (1709) with central pressure 990 hectopascals was centred within 90 nautical miles of two five point nine degrees north (25.9 N) one one seven point five degrees east (117.5 E) and is forecast to move west-northwest slowly for the next 24 hours.

    Maximum winds near the centre are estimated to be 35 knots.

    Radius of over 33 knot winds 30 nautical miles.
    Radius of over 2 metre waves 90 nautical miles.

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

    Forecast position and intensity at 310900 UTC
    Dissipated over land.

    Bulletin issued at 18:30 HKT 30/Jul/2017


    Tropical Cyclone Warning

    At 300900 UTC, Tropical Storm Haitang (1710) with central pressure 988 hectopascals was centred within 60 nautical miles of two two point two degrees north (22.2 N) one two zero point four degrees east (120.4 E) and is forecast to move north-northeast at about 16 knots for the next 24 hours.

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

    Radius of over 33 knot winds 60 nautical miles over southern semicircle, 30 nautical miles elsewhere.
    Radius of over 2 metre waves 120 nautical miles.

    Forecast position and intensity at 310900 UTC
    Two eight point zero degrees north (28.0 N)
    One one seven point five degrees east (117.5 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 010900 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 30/Jul/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     33.8 C
Minimum Air Temperature                     28.8 C
Grass Minimum Temperature                   27.7 C
Relative Humidity                        64 - 79 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          1759.8 mm
Against an average of                     1456.5 mm

Other Stations                Min                  Max
King's Park                  28.5 C               34.0 C
Wong Chuk Hang               29.2 C               34.1 C
Ta Kwu Ling                  26.6 C               36.7 C
Lau Fau Shan                 27.2 C               34.7 C
Tai Po                       27.6 C               35.5 C
Sha Tin                      27.8 C               36.7 C
Tuen Mun                     27.5 C               35.1 C
Tseung Kwan O                26.7 C               35.6 C
Sai Kung                     28.3 C               35.5 C
Cheung Chau                  27.6 C               34.3 C
Chek Lap Kok                 29.4 C               36.4 C
Tsing Yi                     27.4 C               34.1 C
Shek Kong                    26.9 C               35.8 C
Tsuen Wan Ho Koon            26.2 C               33.7 C
Tsuen Wan Shing Mun Valley   26.9 C               34.7 C
Hong Kong Park               28.0 C               34.6 C
Shau Kei Wan                 28.1 C               35.2 C
Kowloon City                 28.6 C               35.2 C
Happy Valley                 28.8 C               36.8 C
Wong Tai Sin                 27.2 C               36.2 C
Stanley                      28.7 C               33.7 C
Kwun Tong                    28.4 C               35.3 C
Sham Shui Po                 28.6 C               35.3 C
Kai Tak Runway Park          29.0 C               34.8 C
Yuen Long Park               26.9 C               36.0 C
Tai Mei Tuk               27.8 C               35.2 C

Duration of sunshine (King's Park):              7.3 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 (29 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                           0.08
Tap Mun                             0.09
Kat O                               0.07
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.11
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 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 29 Jul
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