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Bulletin issued at 17:31 HKT 25/Aug/2017

At 5 p.m. at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 87 per cent.
During the past hour the mean UV Index recorded at King's Park was 2. The intensity of UV radiation was low.

Tropical Storm Pakhar is expected to move across Luzon and enter the South China Sea tomorrow (Saturday). The Observatory will consider issuing the Standby Signal No.1 during the day tomorrow. Owing to the terrain of Luzon, there is still uncertainty in the future track and intensity of Pakhar after crossing Luzon. It will move in a general northwest direction towards western Guangdong but will probably be further away from Hong Kong than Hato. Local winds are expected to strengthen with occasional heavy squally showers on Sunday. Members of the public are advised to take precautions against strong winds and clear storm water drains to avoid flooding. Please also complete all clearing works in relation to Hato as early as possible.

The air temperatures at other places were:

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

Here is the information on Tropical Storm Pakhar at 4 p.m.:
Location: 15.5 degrees north, 122.7 degrees east.


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


Climatological Information for 25 Aug

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 16:45 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 4 p.m., Tropical Storm Pakhar was centred about 210 kilometres east-northeast of Manila. It is forecast to move west-northwest at about 20 kilometres per hour across Luzon.

Weather forecast for tonight and tomorrow

Mainly cloudy with one or two showers. Very hot with sunny periods tomorrow. Temperatures will range between 28 and 33 degrees. Moderate easterly winds, becoming northeasterlies later.

Outlook : Windy with squally showers in the following couple of days. Weather will improve midweek next week.


(The above forecast period is valid up to 23:59 HKT tomorrow, 26/08/2017; 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 25/Aug/2017

GALE WARNING AREAS: BALINTANG AND SCARBOROUGH.

GENERAL SITUATION AT 242100 UTC:
FOR DETAILS ON TROPICAL DEPRESSION PAKHAR (1714), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 250100 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 UP TO 2 M. TEMP 31-27 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 M. =
TAIWAN STRAIT= SE 4-5, BEC NE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SW UP TO 2 M. =
BASHI= E 4-5, 6-7 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 2 M, 3-4 M LATER. SWELL S TO SW UP TO 2 M, SE UP TO 3 M LATER. =
PRATAS= E TO SE 5-6, UP TO 7 LATER. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 4 M LATER. SWELL S TO SW UP TO 2 M. =
BALINTANG= E 6-7, 8 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, 6 M LATER. SWELL S TO SW UP TO 2 M, SE UP TO 3 M LATER. =
SCARBOROUGH= SE 4-5, NE UP TO 8 IN E LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 2 M, UP TO 6 M LATER. SWELL S TO SW UP TO 2 M. =
PARACEL= E 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S UP TO 2 M. =
TONKIN= 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. =
DANANG= E 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S TO SW 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 16:50 HKT 25/Aug/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:50 p.m. on 25 August 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    An easterly airstream is affecting the south China coastal waters.

    At 4 p.m., Tropical Storm Pakhar with maximum sustained winds of about 75 kilometres per hour near its centre was located at 15.5 degrees north, 122.7 degrees east. It is forecast to move west-northwest at about 20 kilometres per hour across Luzon.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 4 to 5, becoming northeast up to force 6 later.
    Isolated squally showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao and Shanwei:
    East force 5 to 6, becoming force 7 later.
    Isolated squally showers and thunderstorms.
    Moderate to rough seas.

    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
    Easterly winds of force 7 to 8, becoming cyclonic winds of force 9 to 10. Occasional heavy squally showers and thunderstorms.

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

    Waglan Island Wind east-northeast force 2
      Visibility 42 Kilometres

    Shantou Wind south-southeast force 2
      Visibility 30 Kilometres

    Dongsha Wind east-northeast force 3
      Visibility 10 Kilometres

    Macau Wind east force 2
      Visibility 30 Kilometres

    Xisha Wind east force 2
      Visibility 28 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 25/AUG/2017
    (Next update at 01:30 HKT 26/AUG/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN EASTERLY AIRSTREAM IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS.
     AT 4 P.M., TROPICAL STORM PAKHAR WAS LOCATED AT
     15.5 DEGREES NORTH, 122.7 DEGREES EAST.  IT IS
     FORECAST TO MOVE WEST-NORTHWEST AT ABOUT 10
     KNOTS ACROSS LUZON.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  100/10
       OFFSHORE:  100/10-15 OCNL 20                    30-28
   B.   2000 FT:  110/10-15 OCNL 20                    22
   C.   5000 FT:  090/15                               20
   D.  10000 FT:  100/20                               11
   E.  18000 FT:  090/20                               MS4
   F.  24000 FT:  080/20                               MS14
   G.  30000 FT:  070/15                               MS29
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW ISOLATED SHOWERS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 2500 FT
   K. VISIBILITY    : 10 KM.  TEMPO 4000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 16000 FT      10 DEG. C LEVEL(S) : 10400 FT
   M. TURBULENCE    : MOD OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 1.0-2.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EAST TO NORTHEASTERLY WINDS.
     SUNNY PERIODS WITH 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 14:55 HKT on 25 Aug 17

    VHHK SIGMET 4 VALID 250655/251055 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1854 E11206 - N1930 E11130 - N2048 E11130 - N2130 E11300 - N1924 E11254 - N1854 E11206 TOP FL420 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 15:30 HKT 25/Aug/2017


    Tropical Cyclone Warning

    At 250600 UTC, Tropical Storm Pakhar (1714) with central pressure 992 hectopascals was centred within 90 nautical miles of one five point five degrees north (15.5 N) one two three point zero degrees east (123.0 E) and is forecast to move west-northwest at about 10 knots 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 120 nautical miles.

    Forecast position and intensity at 260600 UTC
    One eight point one degrees north (18.1 N)
    One one eight point nine degrees east (118.9 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 270600 UTC
    Two one point two degrees north (21.2 N)
    One one three point zero degrees east (113.0 E)
    Maximum winds 55 knots.

    Forecast position and intensity at 280600 UTC
    Two two point three degrees north (22.3 N)
    One zero eight point nine degrees east (108.9 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 290600 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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