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Bulletin issued at 01:02 HKT 01/Aug/2017

At 1 a.m. at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 84 per cent.

The air temperatures at other places were:

King's Park 29 degrees;
Wong Chuk Hang 30 degrees;
Ta Kwu Ling 28 degrees;
Lau Fau Shan 29 degrees;
Tai Po 29 degrees;
Sha Tin 30 degrees;
Tuen Mun 30 degrees;
Tseung Kwan O 30 degrees;
Sai Kung 31 degrees;
Cheung Chau 29 degrees;
Chek Lap Kok 30 degrees;
Tsing Yi 29 degrees;
Shek Kong 30 degrees;
Tsuen Wan Ho Koon 29 degrees;
Tsuen Wan Shing Mun Valley 30 degrees;
Hong Kong Park 30 degrees;
Kowloon City 29 degrees;
Happy Valley 30 degrees;
Wong Tai Sin 30 degrees;
Stanley 29 degrees;
Kwun Tong 30 degrees;
Sham Shui Po 29 degrees;
Kai Tak Runway Park 30 degrees;
Yuen Long Park 30 degrees;
Tai Mei Tuk 29 degrees.


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


Climatological Information for 1 Aug

Regional Weather in Hong Kong

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Bulletin updated at 00:45 HKT 01/Aug/2017

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

A southwesterly airstream affected the south China coast and the northern part of the South China Sea yesterday. Locally, there were sunny intervals and isolated showers. The weather was very hot in the afternoon. The southwesterly airstream is expected to bring a few showers to the south China coast in the next couple of days.

Besides, Haitang weakened from a tropical storm into a tropical depression yesterday. At 11 p.m. last night, Haitang was centred about 100 kilometres east-southeast of Nanchang. It is forecast to move northwest or north-northwest at about 20 kilometres per hour into inland areas and continue to weaken. Noru intensified from a severe typhoon into a super typhoon yesterday. At 11 p.m. last night, Noru was centred about 290 kilometres southwest of Iwo Jima. It is forecast to move northwest slowly towards the seas south of Japan.

Weather forecast for Hong Kong

Mainly cloudy with a few showers. Isolated thunderstorms at first. Sunny intervals in the afternoon. Temperatures will range between 28 and 32 degrees. Moderate to fresh southwesterly winds.

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


(The above forecast period is valid up to 23:59 HKT today, 01/08/2017; 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 21:10 HKT 31/Jul/2017

N0 WARNING.

GENERAL SITUATION AT 310900 UTC:
A SOUTHWESTERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS. TROPICAL DEPRESSION HAITANG (1710) 994 HPA 27N 118E NW OR NNW 14KT WEAKEN.

MARINE FORECAST FOR 24 HOURS FROM 311310 UTC:

HONG KONG= SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL SW UP TO 2 M. TEMP 28-32 C. =
KWANGTUNG= SW 5-6, 7 IN E AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, 4 M IN E AT FIRST. SWELL SW 2-3 M. =
TAIWAN STRAIT= S TO SW 5-6, 7 AT FIRST. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA 2-3 M, 4 M AT FIRST. SWELL SW 3-5 M. =
BASHI= S TO SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL SW 3-5 M. =
PRATAS= SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL SW 3-5 M. =
BALINTANG= S TO SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL SW 3-5 M. =
SCARBOROUGH= S TO SW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 3-4 M. =
PARACEL= SW 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 2-3 M. =
TONKIN= SW 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL S UP TO 2 M. =
DANANG= SW 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 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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  • Tidal Information

    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 23:30 HKT 31/Jul/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 31 July 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    The southwesterly airstream is affecting the south China coastal waters.

    At 11 p.m., Tropical Depression Haitang with maximum sustained winds of about 45 kilometres per hour near its centre was located at 28.2 degrees north, 116.8 degrees east, it is forecast to move northwest or north-northwest at about 20 kilometres per hour into inland areas and continue to weaken.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Southwest force 5 to 6.
    Isolated showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao and Shanwei:
    Southwest force 5 to 6, up to force 7 at first.
    Scattered squally showers and thunderstorms.
    Rough seas.

    South of Hong Kong and Shangchuan Dao:
    Southwest force 5 to 6.
    Isolated showers and thunderstorms.
    Rough seas.

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

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

    Waglan Island Wind west-southwest force 4
      Visibility 14 Kilometres

    Shantou Wind south-southwest force 2
      Visibility 6 Kilometres in showers

    Dongsha Wind southwest force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind west-southwest force 4

    Xisha Wind southwest force 3
      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 01:30 HKT 01/AUG/2017
    (Next update at 9:00-9:30 HKT 01/AUG/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A SOUTHWESTERLY AIRSTREAM IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  240/10
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  240/15-20                            28-33
   B.   2000 FT:  240/15-20                            24
   C.   5000 FT:  260/15                               21
   D.  10000 FT:  280/15                               13
   E.  18000 FT:  270/20                               0
   F.  24000 FT:  270/10                               MS11
   G.  30000 FT:  050/15                               MS24
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY. ISOLATED SHOWERS AND
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT TEMPO FEW CB 1000 FT SCT 2000 FT
      BKN 4000 FT
   K. VISIBILITY    : 8 KM. TEMPO 4000 M IN SHOWERS. TEMPO 2000 M IN THUNDERSTORMS.
   L. 0 DEG. C LEVEL: 18000 FT      10 DEG. C LEVEL(S) : 12000 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH SOUTHWESTERLY 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 10:25 HKT on 31 Jul 17

    VHHK SIGMET 1 VALID 310225/310625 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2318 E11612 - N2342 E11730 - N2118 E11730 - N2106 E11618 - N2318 E11612 TOP FL470 MOV ENE 10KT NC= VHHK SIGMET 7 VALID 302225/310225 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2300 E11524 - N2342 E11730 - N2112 E11730 - N2100 E11612 - N2300 E11524 TOP FL470 MOV ENE 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

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    Severe Weather Information Centre

    Bulletin issued at 15:30 HKT 31/Jul/2017


    Tropical Cyclone Warning

    Tropical Storm Haitang (1710) has weakened into a Tropical Depression with central pressure 998 hectopascals. At 310600 UTC, it was centred within 90 nautical miles of two six point nine degrees north (26.9 N) one one eight point zero degrees east (118.0 E) and is forecast to move northwest or north-northwest at about 14 knots 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.

    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 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 01/Aug/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     32.4 C
Minimum Air Temperature                     29.8 C
Grass Minimum Temperature                   28.5 C
Relative Humidity                        68 - 86 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          1759.8 mm
Against an average of                     1473.3 mm

Other Stations                Min                  Max
King's Park                  29.6 C               32.8 C
Wong Chuk Hang               29.8 C               31.9 C
Ta Kwu Ling                  28.2 C               34.5 C
Lau Fau Shan                 29.1 C               34.1 C
Tai Po                       29.4 C               33.9 C
Sha Tin                      30.2 C               33.7 C
Tuen Mun                     29.6 C               32.5 C
Tseung Kwan O                28.9 C               33.4 C
Sai Kung                     30.5 C               34.3 C
Cheung Chau                  28.6 C               31.1 C
Chek Lap Kok                 30.4 C               34.6 C
Tsing Yi                     29.5 C               33.1 C
Shek Kong                    29.6 C               34.5 C
Tsuen Wan Ho Koon            28.4 C               31.8 C
Tsuen Wan Shing Mun Valley   29.4 C               33.4 C
Hong Kong Park               29.7 C               32.4 C
Kowloon City                 29.3 C               32.9 C
Happy Valley                 30.2 C               34.1 C
Wong Tai Sin                 28.8 C               33.2 C
Stanley                      29.3 C               31.1 C
Kwun Tong                    29.6 C               32.7 C
Sham Shui Po                 29.5 C               33.3 C
Kai Tak Runway Park          29.9 C               33.0 C
Yuen Long Park               29.8 C               34.2 C
Tai Mei Tuk               29.3 C               33.7 C

Duration of sunshine (King's Park):              3.6 H
The mean UV index recorded at King's Park yesterday was 3,
the UV intensity was Moderate.
The maximum UV index for yesterday was 7.
 

Yesterday's (31 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 31 Jul
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