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Bulletin issued at 15:02 HKT 31/Aug/2017

At 3 p.m. at the Hong Kong Observatory the air temperature was 32 degrees Celsius and the relative humidity 66 per cent.
During the past hour the mean UV Index recorded at King's Park was 4. The intensity of UV radiation was moderate.

Hot weather might cause adverse health effects. The Observatory advises the public to stay on the alert.

The air temperatures at other places were:

King's Park 32 degrees;
Wong Chuk Hang 31 degrees;
Ta Kwu Ling 34 degrees;
Lau Fau Shan 33 degrees;
Tai Po 33 degrees;
Sha Tin 34 degrees;
Tuen Mun 33 degrees;
Tseung Kwan O 33 degrees;
Sai Kung 31 degrees;
Cheung Chau 33 degrees;
Chek Lap Kok 33 degrees;
Tsing Yi 32 degrees;
Shek Kong 33 degrees;
Tsuen Wan Ho Koon 30 degrees;
Tsuen Wan Shing Mun Valley 32 degrees;
Hong Kong Park 31 degrees;
Shau Kei Wan 33 degrees;
Kowloon City 33 degrees;
Happy Valley 33 degrees;
Wong Tai Sin 33 degrees;
Stanley 33 degrees;
Kwun Tong 34 degrees;
Sham Shui Po 33 degrees;
Kai Tak Runway Park 32 degrees;
Yuen Long Park 34 degrees;
Tai Mei Tuk 34 degrees.


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


Climatological Information for 31 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 14:45 HKT 31/Aug/2017

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

The subtropical ridge is covering southeastern China. Meanwhile, the area of low pressure over the northeastern part of the South China Sea is intensifying gradually, a tropical cyclone appears to be forming.

Weather forecast for this afternoon and tonight

Sunny periods. It will be hot and hazy. A few showers and thunderstorms later. Light to moderate northeasterly winds.

Outlook : Sunny periods tomorrow. Weather will deteriorate in the following couple of days. There will be heavy squally showers and winds will strengthen gradually.


(The above forecast period is valid up to 23:59 HKT today, 31/08/2017; 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 09:00 HKT 31/Aug/2017

GALE WARNING AREAS: PRATAS, BALINTANG AND SCARBOROUGH.

GENERAL SITUATION AT 302100 UTC:
LOW 1004 HPA 19N 120E W 10KT INTST NC.

MARINE FORECAST FOR 24 HOURS FROM 310100 UTC:

HONG KONG= NE 4-5. DOWN TO 4000 M IN SOME HAZE. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL NE UP TO 2 M LATER. TEMP 33-28 C. =
KWANGTUNG= N TO NE 5-6, BEC 7 IN E. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, BEC 4 M. SWELL NE 2 M. =
TAIWAN STRAIT= NE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
BASHI= NE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
PRATAS= N TO NE 6-7, OCNL 8 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M LATER. SWELL NE 2 M. =
BALINTANG= NE 6-7, OCNL 8 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M LATER. SWELL NE 2 M. =
SCARBOROUGH= W TO SW 6-7, OCNL 8 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M LATER. SWELL NE 2 M. =
PARACEL= N TO NW 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL NE UP TO 2 M. =
TONKIN= N 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= N 4-5. ISOL SHOWERS AND TS. SEA UP TO 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 12:30 HKT 31/Aug/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 p.m. on 31 August 2017

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

    Weather Situation:
    A northerly airstream is affecting the coastal waters of Guangdong. Meanwhile, the area of low pressure over the northeastern part of the South China Sea is intensifying gradually, a tropical cyclone appears to be forming.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Northeast force 4 to 5.
    Some haze. Isolated squally showers and thunderstorms.
    Moderate seas.

    Nan'ao:
    North to northeast force 6 to 7, becoming force 8 later.
    Scattered heavy squally showers and thunderstorms.
    Rough seas, becoming very rough later.

    Shanwei and South of Hong Kong:
    North to northeast force 5 to 6, becoming force 7.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Shangchuan Dao:
    North to northwest force 4 to 5, becoming force 6 later.
    Isolated squally showers and thunderstorms.
    Moderate seas, becoming rough later.

    Outlook for the next 48 hours
    Northeasterly winds of force 6 to 7, cyclonic winds of force 8 in east. Occasional heavy squally showers and thunderstorms.

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

    Waglan Island Wind calm
      Visibility 36 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 30 Kilometres

    Macau Wind east force 1
      Visibility 20 Kilometres

    Xisha Wind north-northwest force 2
      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 09:30 HKT 31/AUG/2017
    (Next update at 17:30 HKT 31/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 NORTHERLY AIRSTREAM IS AFFECTING THE COASTAL
     WATERS OF GUANGDONG. MEANWHILE, THE AREA OF LOW
     PRESSURE NEAR LUZON IS INTENSIFYING GRADUALLY, A
     TROPICAL CYCLONE APPEARS TO BE FORMING.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  360/5-10
                  TEMPO VRB/15G25 IN TS                29-35
   B.   2000 FT:  030/10                               25
   C.   5000 FT:  030/10                               19
   D.  10000 FT:  050/15                               13
   E.  18000 FT:  050/20                               MS1
   F.  24000 FT:  040/20                               MS11
   G.  30000 FT:  010/15                               MS24
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      SUNNY PERIODS. LOCALIZED HAZE. ISOLATED SHOWERS
      AND A FEW THUNDERSTORMS OVER INLAND LATER.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT. 
      TEMPO FEW CB 1000 FT  SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 8 KM. TEMPO 4000 M IN HAZE/SHOWERS.  
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS.
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT TO MODERATE NORTHEASTERLY WINDS. 
     MAINLY CLOUDY WITH ISOLATED SHOWERS AND A FEW
     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 15:15 HKT on 31 Aug 17

    VHHK SIGMET 1 VALID 310715/311115 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2230 E11724 - N2100 E11730 - N1848 E11542 - N2024 E11500 - N2212 E11630 - N2230 E11724 TOP FL420 STNR 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.

    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 15:30 HKT 31/Aug/2017


    Tropical Cyclone Warning

    An area of low pressure over the northeastern part of South China Sea has intensified into a Tropical Depression with central pressure 1000 hectopascals. At 310600 UTC, it was centred within 90 nautical miles of one nine point four degrees north (19.4 N) one one eight point nine degrees east (118.9 E) and is forecast to be slow moving for the next 24 hours.

    Maximum winds near the centre are estimated to be 25 knots.

    Radius of over 2 metre waves 60 nautical miles.

    Forecast position and intensity at 010600 UTC
    One nine point eight degrees north (19.8 N)
    One one eight point one degrees east (118.1 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 020600 UTC
    Two zero point nine degrees north (20.9 N)
    One one six point eight degrees east (116.8 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 030600 UTC
    Two two point six degrees north (22.6 N)
    One one five point three degrees east (115.3 E)
    Maximum winds 65 knots.

    Forecast position and intensity at 040600 UTC
    Two five point five degrees north (25.5 N)
    One one four point five degrees east (114.5 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 050600 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 31/Aug/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.6 C
Minimum Air Temperature                     27.0 C
Grass Minimum Temperature                   25.9 C
Relative Humidity                        65 - 91 Percent
Rainfall                                     0.4 mm 
Total rainfall since 1st January          2244.8 mm
Against an average of                     1894.2 mm

Other Stations                Min                  Max
King's Park                  26.4 C               31.9 C
Wong Chuk Hang               25.1 C               32.0 C
Ta Kwu Ling                  24.1 C               34.9 C
Lau Fau Shan                 25.7 C               33.7 C
Tai Po                       25.5 C               33.1 C
Sha Tin                      25.4 C               33.9 C
Tuen Mun                     26.0 C               33.9 C
Tseung Kwan O                24.2 C               34.5 C
Sai Kung                     25.9 C               32.9 C
Cheung Chau                  25.8 C               33.3 C
Chek Lap Kok                 27.5 C               34.3 C
Tsing Yi                     25.5 C               32.1 C
Shek Kong                    24.9 C               34.0 C
Tsuen Wan Ho Koon            24.5 C               30.2 C
Tsuen Wan Shing Mun Valley   24.7 C               32.7 C
Hong Kong Park               26.0 C               33.2 C
Shau Kei Wan                 23.1 C               33.5 C
Kowloon City                 26.2 C               33.0 C
Happy Valley                 25.8 C               33.4 C
Wong Tai Sin                 25.7 C               32.8 C
Stanley                      24.0 C               32.1 C
Kwun Tong                    24.8 C               32.9 C
Sham Shui Po                 26.5 C               32.6 C
Kai Tak Runway Park          25.7 C               33.3 C
Yuen Long Park               25.8 C               34.9 C
Tai Mei Tuk               26.0 C               34.1 C

Duration of sunshine (King's Park):              7.3 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.
Sea surface temperature (Waglan Island):        27.2 C 

Yesterday's (30 Aug 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 30 Aug
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