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Bulletin issued at 16:02 HKT 30/Jul/2017

At 4 p.m. at the Hong Kong Observatory the air temperature was 35 degrees Celsius and the relative humidity 58 per cent.
During the past hour the mean UV Index recorded at King's Park was 3. The intensity of UV radiation was moderate.

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 35 degrees;
Wong Chuk Hang 35 degrees;
Ta Kwu Ling 37 degrees;
Lau Fau Shan 35 degrees;
Tai Po 36 degrees;
Sha Tin 37 degrees;
Tuen Mun 36 degrees;
Tseung Kwan O 35 degrees;
Sai Kung 37 degrees;
Cheung Chau 34 degrees;
Chek Lap Kok 37 degrees;
Tsing Yi 35 degrees;
Shek Kong 36 degrees;
Tsuen Wan Ho Koon 35 degrees;
Tsuen Wan Shing Mun Valley 36 degrees;
Hong Kong Park 35 degrees;
Shau Kei Wan 36 degrees;
Kowloon City 37 degrees;
Happy Valley 37 degrees;
Wong Tai Sin 37 degrees;
Stanley 35 degrees;
Kwun Tong 36 degrees;
Sham Shui Po 37 degrees;
Kai Tak Runway Park 35 degrees;
Yuen Long Park 37 degrees;
Tai Mei Tuk 34 degrees.

Here is the information on Tropical Storm Nesat at 4 p.m.:
Location: 25.9 degrees north, 117.8 degrees east.

Here is the information on Tropical Storm Haitang at 4 p.m.:
Location: 22.0 degrees north, 120.3 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 16:15 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, temperatures over many places rose to around 35 degrees in the afternoon.

Severe Tropical Storm Nesat has weakened into a tropical storm. At 4 p.m., Nesat was centred about 150 kilometres west of Fuzhou. It is forecast to move west-northwest slowly across inland Fujian and further weaken. Meanwhile, Tropical Storm Haitang was centred about 70 kilometres south of Gaoxiong. It is forecast to move north-northeast at about 28 kilometres per hour towards Taiwan.

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.


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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 30/Jul/2017

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

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

    Weather Situation:
    Severe Tropical Storm Nesat has weakened into a tropical storm. At 4 p.m., Nesat with maximum sustained winds of about 75 kilometres per hour near its centre was located at 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 with maximum sustained winds of about 75 kilometres per hour near its centre was located at 22.0 degrees north, 120.3 degrees east, it is forecast to move north-northeast at about 28 kilometres per hour towards Taiwan.

    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 9, occasionally force 10.
    Frequent heavy squally showers and thunderstorms.
    High to very high seas.

    Shanwei:
    West to southwest force 7 to 8.
    Frequent heavy squally showers and thunderstorms.
    Very rough to high seas.

    South of Hong Kong:
    West to southwest force 6 to 7.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Shangchuan Dao:
    West to 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, up to force 8 in east at first. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind west-southwest force 5
      Visibility 6 Kilometres

    Shantou Wind west-northwest force 2
      Visibility 30 Kilometres

    Dongsha Wind west force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind west-southwest force 4

    Macau Wind northwest force 2
      Visibility 10 Kilometres

    Xisha Wind west-southwest force 3
      Visibility 12 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 09:30 HKT 30/JUL/2017
    (Next update at 17:30 HKT 30/JUL/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 8 A.M., TROPICAL STORM HAITANG WAS CENTRED
     ABOUT 340 KILOMETRES SOUTH-SOUTHWEST OF
     GAOXIONG. IT IS FORECAST TO MOVE NORTHEAST AT
     ABOUT 12 KNOTS, EDGING CLOSE TO THE VICINITY OF
     TAIWAN. MEANWHILE, TYPHOON NESAT WAS CENTRED
     ABOUT 40 KILOMETRES SOUTH-SOUTHEAST OF FUZHOU.
     IT IS FORECAST TO MOVE NORTHWEST OR
     WEST-NORTHWEST AT ABOUT 10 KNOTS INTO INLAND
     FUJIAN AND WEAKEN GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  270/10
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  270/15-20                            33-35
   B.   2000 FT:  320/15-20, OCNL 25                   28
   C.   5000 FT:  350/25                               22
   D.  10000 FT:  350/25                               13
   E.  18000 FT:  360/20                               MS2
   F.  24000 FT:  030/20                               MS12
   G.  30000 FT:  050/20                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      HAZY WITH SUNNY PERIODS. A FEW SHOWERS AND
      THUNDERSTORMS LATER.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3500 FT. TEMPO FEW CB 1000 FT SCT 2500 FT
   K. VISIBILITY    : 7 KM. TEMPO 3000 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 AT THE LOW LEVELS
   N. SEA STATE     : 1.5-2.5 M     SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH WEST TO SOUTHWESTERLY WINDS.
     MAINLY CLOUDY WITH A FEW SHOWERS. 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.

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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 15:20 HKT on 30 Jul 17

    VHHK SIGMET 1 VALID 300320/300720 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1748 E11454 - N1748 E11348 - N2200 E11512 - N2242 E11730 - N2100 E11730 TOP FL500 MOV NE 05KT NC= 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=

    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 15:31 HKT 30/Jul/2017


    Tropical Cyclone Warning

    Severe Tropical Storm Nesat (1709) has weakened into a Tropical Storm with central pressure 990 hectopascals. At 300600 UTC, it was centred within 90 nautical miles of two five point nine degrees north (25.9 N) one one eight point zero degrees east (118.0 E) and is forecast to move west-northwest slowly 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 310600 UTC
    Dissipated over land.

    Bulletin issued at 15:30 HKT 30/Jul/2017


    Tropical Cyclone Warning

    At 300600 UTC, Tropical Storm Haitang (1710) with central pressure 988 hectopascals was centred within 60 nautical miles of two one point seven degrees north (21.7 N) one two zero point two degrees east (120.2 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 310600 UTC
    Two seven point four degrees north (27.4 N)
    One one eight point zero degrees east (118.0 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 010600 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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