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Bulletin issued at 01:02 HKT 26/Aug/2017

At 1 a.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 85 per cent.

The air temperatures at other places were:

King's Park 27 degrees;
Wong Chuk Hang 28 degrees;
Ta Kwu Ling 26 degrees;
Lau Fau Shan 26 degrees;
Tai Po 27 degrees;
Sha Tin 27 degrees;
Tuen Mun 26 degrees;
Tseung Kwan O 26 degrees;
Sai Kung 27 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 28 degrees;
Shek Kong 26 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 26 degrees;
Hong Kong Park 27 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 27 degrees;
Happy Valley 28 degrees;
Wong Tai Sin 27 degrees;
Stanley 27 degrees;
Kwun Tong 27 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 28 degrees;
Yuen Long Park 26 degrees.

Here is the information on Tropical Storm Pakhar at 11:00 p.m. yesterday:
Location: 16.2 degrees north, 121.9 degrees east.


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


Climatological Information for 26 Aug

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Bulletin updated at 00:45 HKT 26/Aug/2017

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

The weather was generally fine over southeastern China yesterday. Locally, it was hot with sunny periods and a few showers. Besides, the tropical depression to the east of the Philippines was named Pakhar yesterday morning and intensified into a tropical storm. Pakhar is expected to cross Luzon, move into the northern part of the South China Sea and intensify gradually today. It will move closer to the south China coast and bring squally showers and thunderstorms to the region afterwards.

At 11 p.m. last night, Tropical Storm Pakhar was centred about 210 kilometres north-northeast of Manila. It is forecast to move west-northwest at about 22 kilometres per hour across Luzon.

Weather forecast for Hong Kong

Mainly cloudy with one or two showers. One or two thunderstorms over the southern waters of Hong Kong at first. Very hot with sunny periods during the day. 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 today, 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 21:00 HKT 25/Aug/2017

GALE WARNING AREAS: KWANGTUNG, BASHI, PRATAS, BALINTANG AND SCARBOROUGH.

GENERAL SITUATION AT 250900 UTC:
FOR DETAILS ON TROPICAL STORM PAKHAR (1714), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 251300 UTC:

HONG KONG= E 4-5, NE UP TO 6 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S UP TO 2 M. TEMP 28-33 C. =
KWANGTUNG= E 5-6, UP TO 9 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 8 M LATER. SWELL S 2 M, SE 3 M LATER. =
TAIWAN STRAIT= 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 6-7, UP TO 9 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 8 M LATER. SWELL S TO SW UP TO 2 M, SE 3 M LATER. =
PRATAS= E TO SE 5-6, CYCLONIC UP TO 9 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 8 M LATER. SWELL S TO SW UP TO 2 M, SE 3 M LATER. =
BALINTANG= E 6-7, CYCLONIC UP TO 9 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 8 M LATER. SWELL S TO SW UP TO 2 M, SE 3 M LATER. =
SCARBOROUGH= NE 7-8, BEC CYCLONIC UP TO 9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, BEC 8 M. SWELL S TO SW UP TO 2 M, SE 3 M LATER. =
PARACEL= E 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S 2 M. =
TONKIN= E TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S TO SW 2 M. =
DANANG= E 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 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 23:30 HKT 25/Aug/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 25 August 2017

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

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

    At 11 p.m., Tropical Storm Pakhar with maximum sustained winds of about 75 kilometres per hour near its centre was located at 16.2 degrees north, 121.9 degrees east, it is forecast to move west-northwest at about 22 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, Shanwei and South of Hong Kong:
    East force 5 to 6, up to force 9 later.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas, becoming high seas later.

    Shangchuan Dao:
    East force 5 to 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    Easterly winds of force 8 to 9, becoming cyclonic winds up to force 11. Occasional heavy squally showers and thunderstorms.

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

    Waglan Island Wind north-northeast force 3
      Visibility 23 Kilometres

    Shantou Wind south-southeast force 1
      Visibility 30 Kilometres

    Dongsha Wind east force 4
      Visibility 10 Kilometres

    Macau Wind southeast force 2
      Visibility 35 Kilometres

    Xisha Wind east-northeast force 1
      Visibility 30 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 26/AUG/2017
    (Next update at 9:00-9:30 HKT 26/AUG/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN EASTERLY AIRSTREAM IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS.
     AT 11 P.M. LAST NIGHT, TROPICAL STORM PAKHAR WAS
     LOCATED AT 16.2 DEGREES NORTH, 121.9 DEGREES
     EAST.  IT IS FORECAST TO MOVE WEST-NORTHWEST AT
     ABOUT 12 KNOTS ACROSS LUZON.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  100/5-10
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  100/10-15                            26-34
   B.   2000 FT:  110/15                               25
   C.   5000 FT:  110/15                               20
   D.  10000 FT:  100/20                               12
   E.  18000 FT:  100/20                               MS2
   F.  24000 FT:  080/25                               MS13
   G.  30000 FT:  060/20                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW ISOLATED SHOWERS AND
      THUNDERSTORMS
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 2500 FT TEMPO FEW 800 FT CB
      SCT 2000 FT
   K. VISIBILITY    : 10 KM.  TEMPO 4000 M IN SHOWERS. TEMPO 2500 M IN TS
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11400 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS, OFFSHORE AND  NEAR HILLS
   N. SEA STATE     : 1.0-1.5 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.

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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 01:00 HKT on 26 Aug 17

    VHHK SIGMET 7 VALID 251500/251700 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1906 E11554 - N1900 E11554 - N1900 E11230 - N2100 E11230 - N2100 E11600 - N1906 E11554 TOP FL420 MOV W 15KT NC= VHHK SIGMET 9 VALID 251700/252100 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1942 E11130 - N2118 E11130 - N2118 E11542 - N1942 E11542 - N1942 E11130 TOP FL420 MOV W 15KT 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 00:30 HKT 26/Aug/2017


    Tropical Cyclone Warning

    At 251500 UTC, Tropical Storm Pakhar (1714) with central pressure 992 hectopascals was centred within 90 nautical miles of one six point five degrees north (16.5 N) one two one point eight degrees east (121.8 E) and is forecast to move west-northwest at about 14 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.
    Radius of over 2 metre waves 120 nautical miles.

    Forecast position and intensity at 261500 UTC
    One nine point four degrees north (19.4 N)
    One one six point eight degrees east (116.8 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 271500 UTC
    Two one point eight degrees north (21.8 N)
    One one one point five degrees east (111.5 E)
    Maximum winds 60 knots.

    Forecast position and intensity at 281500 UTC
    Two two point six degrees north (22.6 N)
    One zero six point nine degrees east (106.9 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 291500 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 26/Aug/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     32.7 C
Minimum Air Temperature                     27.8 C
Grass Minimum Temperature                   27.4 C
Relative Humidity                        72 - 93 Percent
Rainfall                                     0.1 mm 
Total rainfall since 1st January          1974.5 mm
Against an average of                     1847.6 mm

Other Stations                Min                  Max
King's Park                  27.2 C               32.3 C
Wong Chuk Hang               27.4 C               32.1 C
Ta Kwu Ling                  25.8 C               32.5 C
Lau Fau Shan                 26.1 C               32.8 C
Tai Po                       26.6 C               30.6 C
Sha Tin                      27.1 C               32.1 C
Tuen Mun                     25.8 C               31.1 C
Tseung Kwan O                26.3 C               31.9 C
Sai Kung                     27.4 C               31.3 C
Cheung Chau                  26.2 C               32.8 C
Chek Lap Kok                 27.8 C               33.9 C
Tsing Yi                     27.4 C               33.1 C
Shek Kong                    25.5 C               33.0 C
Tsuen Wan Ho Koon            25.2 C               31.0 C
Tsuen Wan Shing Mun Valley   25.8 C               32.5 C
Hong Kong Park               27.7 C               32.2 C
Shau Kei Wan                 26.1 C               31.2 C
Kowloon City                 27.2 C               32.0 C
Happy Valley                 27.8 C               32.0 C
Wong Tai Sin                 26.9 C               31.7 C
Stanley                      27.0 C               30.8 C
Kwun Tong                    27.1 C               31.1 C
Sham Shui Po                 27.7 C               32.2 C
Kai Tak Runway Park          26.4 C               30.7 C
Yuen Long Park               26.4 C               34.4 C

Duration of sunshine (King's Park):              5.9 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 12.
 

Yesterday's (25 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                             0.08
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 25 Aug
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