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Bulletin issued at 06:02 HKT 25/Aug/2017

At 6 a.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 88 per cent.

The air temperatures at other places were:

King's Park 28 degrees;
Wong Chuk Hang 29 degrees;
Ta Kwu Ling 27 degrees;
Lau Fau Shan 27 degrees;
Tai Po 28 degrees;
Sha Tin 28 degrees;
Tuen Mun 27 degrees;
Tseung Kwan O 27 degrees;
Sai Kung 28 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 29 degrees;
Tsing Yi 28 degrees;
Shek Kong 28 degrees;
Tsuen Wan Ho Koon 26 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 28 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 28 degrees;
Happy Valley 28 degrees;
Wong Tai Sin 28 degrees;
Stanley 27 degrees;
Kwun Tong 27 degrees;
Sham Shui Po 28 degrees;
Kai Tak Runway Park 28 degrees;
Yuen Long Park 28 degrees.


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


Climatological Information for 25 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 06:15 HKT 25/Aug/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 Pakhar was centred about 400 kilometres east-northeast of Manila. It is forecast to move west or west-northwest at about 22 kilometres per hour towards the vicinity of Luzon.

Weather forecast for today

Sunny intervals and a few showers. Hot with a maximum temperature of about 31 degrees. Moderate east to southeasterly winds.

Outlook : Hot with sunny intervals tomorrow. More showers in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 25/08/2017; 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 21:00 HKT 24/Aug/2017

N0 WARNING.

GENERAL SITUATION AT 240900 UTC:
TROPICAL DEPRESSION HATO (1713) 996HPA 23N 106E W 14 KT WKN. LOW 1008HPA 16N 128E W 5 KT INTSF.

MARINE FORECAST FOR 24 HOURS FROM 241300 UTC:

HONG KONG= E TO SE 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S 2 M. TEMP 27-31 C. =
KWANGTUNG= E TO SE 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S TO SW 2-3 M. =
TAIWAN STRAIT= SE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SW 2 M. =
BASHI= E TO SE 4-5, UP TO 6 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2 M, UP TO 3 M LATER. SWELL S TO SW 2 M. =
PRATAS= E TO SE 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S TO SW 2 M. =
BALINTANG= E TO SE 4-5, 6-7 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2 M, 3-4 M LATER. SWELL S TO SW 2 M. =
SCARBOROUGH= S 4-5, NE 5 IN E LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SW 2 M. =
PARACEL= E TO SE 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S 2 M. =
TONKIN= SE 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S TO SW 2-3 M. =
DANANG= SE 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S TO SW 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 05:30 HKT 25/Aug/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 25 August 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    At 5 a.m., Tropical Depression Pakhar with maximum sustained winds of about 55 kilometres per hour near its centre was located near 15.4 degrees north, 124.6 degrees east. It is forecast to move west or west-northwest at about 22 kilometres per hour towards the vicinity of Luzon.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to southeast force 4 to 5, occasionally force 6.
    Isolated squally showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    East to southeast force 4 to 5, occasionally force 6.
    Isolated squally showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    East to southeasterly winds of force 7 to 8, becoming cyclonic winds of force 9 to 10 in east later. Occasional heavy squally showers and thunderstorms.

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

    Waglan Island Wind east force 4
      Visibility 9 Kilometres

    Shantou Wind calm
      Visibility 30 Kilometres

    Dongsha Wind southeast force 2
      Visibility 10 Kilometres

    Xisha Wind south force 2
      Visibility 24 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 25/AUG/2017
    (Next update at 9:00-9:30 HKT 25/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 SOUTHERLY AIRSTREAM IS AFFECTING THE COAST OF
     GUANGDONG. AT 11 P.M. LAST NIGHT, THE AREA OF
     LOW PRESSURE TO THE EAST OF THE PHILIPPINES
     INTENSIFIED INTO A TROPICAL DEPRESSION.  IT WAS
     CENTRED NEAR 15.6 DEGREES NORTH, 126.2 DEGREES
     EAST AND IS FORECAST TO MOVE WEST-NORTHWEST AT
     ABOUT 11 KNOTS TOWARDS THE VICINITY OF LUZON.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  120/10
                  /TEMPO VRB/15G25 IN TS
                  
       OFFSHORE:  140/15 OCNL 20                       27-30
   B.   2000 FT:  140/15-20                            22
   C.   5000 FT:  130/10                               20
   D.  10000 FT:  100/10                               12
   E.  18000 FT:  080/10                               MS4
   F.  24000 FT:  080/10                               MS14
   G.  30000 FT:  100/20                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH ISOLATED SHOWERS AND
      THUNDERSTORMS. HOT WITH SUNNY INTERVALS DURING
      THE DAY.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 2500 FT.
   K. VISIBILITY    : 9 KM.  TEMPO 3000 M IN SHOWERS/TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11200 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS, OFFSHORE AND  NEAR HILLS
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE  EAST TO SOUTHEASTERLY WINDS.  SUNNY
     INTERVALS AND A FEW SHOWERS.=

    ===================================================================
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 04:42 HKT on 25 Aug 17

    VHHK SIGMET 2 VALID 241755/242155 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1736 E11442 - N1812 E11330 - N2212 E11542 - N2230 E11730 - N2100 E11730 TOP FL400 MOV W 10KT NC= VHHK SIGMET 3 VALID 242045/250045 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1642 E11400 - N1748 E11300 - N2200 E11536 - N2200 E11730 - N2100 E11730 TOP FL400 MOV W 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.

    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 06:31 HKT 25/Aug/2017


    Tropical Cyclone Warning

    Tropical Depression Pakhar (1714) has entered the area of responsibility of the Hong Kong Observatory.

    At 242100 UTC, Tropical Depression Pakhar (1714) with central pressure 998 hectopascals was centred within 90 nautical miles of one five point two degrees north (15.2 N) one two four point six degrees east (124.6 E) and is forecast to move west or west-northwest at about 12 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.

    Forecast position and intensity at 252100 UTC
    One seven point five degrees north (17.5 N)
    One two zero point eight degrees east (120.8 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 262100 UTC
    Two zero point six degrees north (20.6 N)
    One one five point four degrees east (115.4 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 272100 UTC
    Two two point three degrees north (22.3 N)
    One zero nine point eight degrees east (109.8 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 282100 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 25/Aug/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.5 C
Minimum Air Temperature                     27.3 C
Grass Minimum Temperature                   26.0 C
Relative Humidity                        79 - 90 Percent
Rainfall                                      Trace 
Total rainfall since 1st January          1974.4 mm
Against an average of                     1836.6 mm

Other Stations                Min                  Max
King's Park                  27.2 C               31.8 C
Wong Chuk Hang               28.0 C               32.1 C
Ta Kwu Ling                  26.4 C               33.5 C
Lau Fau Shan                 26.8 C               33.0 C
Tai Po                       27.3 C               30.6 C
Sha Tin                      28.8 C               32.3 C
Tuen Mun                     27.6 C               32.3 C
Tseung Kwan O                26.9 C               31.6 C
Sai Kung                     27.2 C               30.8 C
Cheung Chau                  25.2 C               31.7 C
Chek Lap Kok                 25.7 C               33.4 C
Tsing Yi                     28.0 C               33.8 C
Shek Kong                    27.8 C               33.7 C
Tsuen Wan Ho Koon            26.0 C               30.5 C
Tsuen Wan Shing Mun Valley   27.4 C               32.8 C
Hong Kong Park               28.0 C               32.4 C
Shau Kei Wan                 26.8 C               30.8 C
Kowloon City                 27.3 C               32.0 C
Happy Valley                 28.0 C               32.1 C
Wong Tai Sin                 27.4 C               31.7 C
Stanley                      27.2 C               32.2 C
Kwun Tong                    27.5 C               31.7 C
Sham Shui Po                 28.0 C               32.9 C
Kai Tak Runway Park          27.1 C               30.3 C
Yuen Long Park               28.4 C               34.0 C

Duration of sunshine (King's Park):              7.0 H
The mean UV index recorded at King's Park yesterday was 5,
the UV intensity was Moderate.
The maximum UV index for yesterday was 11.
 

Yesterday's (24 Aug 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                           0.07
Tap Mun                             0.08
Kat O                               0.08
Yuen Ng Fan                         0.11
Tai Mei Tuk                         0.11
Sha Tau Kok                         0.10
Kwun Tong                           0.11
Sai Wan Ho                          0.09
King's Park                         0.14
Tsim Bei Tsui                       0.12
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 24 Aug
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