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Bulletin issued at 09:02 HKT 27/Aug/2017

At 9 a.m. at the Hong Kong Observatory the air temperature was 26 degrees Celsius and the relative humidity 96 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.3. The intensity of UV radiation was low.

Please be reminded that:

The Tropical Cyclone Signal No. 8 has been issued.
The Amber Rainstorm Warning Signal has been issued.

The air temperatures at other places were:

King's Park 26 degrees;
Wong Chuk Hang 26 degrees;
Ta Kwu Ling 26 degrees;
Lau Fau Shan 26 degrees;
Tai Po 26 degrees;
Sha Tin 27 degrees;
Tuen Mun 27 degrees;
Tseung Kwan O 26 degrees;
Sai Kung 26 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 29 degrees;
Tsing Yi 26 degrees;
Shek Kong 27 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 26 degrees;
Hong Kong Park 26 degrees;
Shau Kei Wan 26 degrees;
Kowloon City 25 degrees;
Happy Valley 27 degrees;
Wong Tai Sin 26 degrees;
Stanley 26 degrees;
Kwun Tong 26 degrees;
Sham Shui Po 26 degrees;
Kai Tak Runway Park 27 degrees;
Yuen Long Park 27 degrees.

Between 7:45 and 8:45 a.m., the rainfall recorded in various regions were:

North District 4 to 14 mm;
Yuen Long 1 to 10 mm;
Tai Po 2 to 9 mm;
Sai Kung 0 to 5 mm;
Kwai Tsing 1 to 5 mm;
Tuen Mun 1 to 4 mm;
Tsuen Wan 0 to 4 mm;
Eastern District 0 to 4 mm;
Central & Western District 1 to 3 mm;
Yau Tsim Mong 1 to 3 mm;
Sha Tin 3 mm;
Islands District 0 to 2 mm;
Southern District 1 to 2 mm;
Wan Chai 1 to 2 mm;
Wong Tai Sin 1 mm;
Sham Shui Po 1 mm;
Kowloon City 1 mm;
Kwun Tong 1 mm.

Between midnight and 9 a.m. the minimum temperature was 24.0 degrees Celsius at the Hong Kong Observatory.

Here is the information on Severe Tropical Storm Pakhar:
Location: 21.9 degrees north, 113.4 degrees east; Maximum sustained wind near its centre: 110 km/h.


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


Climatological Information for 27 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Automatic Regional Weather Forecast in Hong Kong & Pearl River Delta Region

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Bulletin updated at 08:45 HKT 27/Aug/2017

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

Weather forecast for today

Gale force southeasterly winds. Occasionally storm force winds over the southern part of the territory at first. Winds will moderate tonight. Cloudy with occasional heavy squally showers. Seas will be very rough with swells. Temperatures will linger around 26 degrees during the day.

Outlook : There will still be showers tomorrow. Weather will improve in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 27/08/2017; 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 27/Aug/2017

STORM WARNING AREAS: HONG KONG, KWANGTUNG AND PARACEL.
GALE WARNING AREA: PRATAS.

GENERAL SITUATION AT 262100 UTC:
FOR DETAILS ON SEVERE TROPICAL STORM PAKHAR (1714), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 270100 UTC:

HONG KONG= SE UP TO 11, 6-7 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 12 M, 3-4 M LATER. SWELL SE 3 M. TEMP 28-27 C. =
KWANGTUNG= CYCLONIC 11, BEC S TO SE 8-9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 12 M, BEC 8 M. SWELL SE 3 M. =
TAIWAN STRAIT= SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SE 2 M. =
BASHI= E TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SE 2 M. =
PRATAS= SE 6-7, UP TO 9 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 8 M AT FIRST. SWELL SE 3 M. =
BALINTANG= E TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SE 2 M. =
SCARBOROUGH= S TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SE 3 M. =
PARACEL= S TO SE UP TO 11, BEC 7-8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 12 M, BEC 4-6 M. SWELL SE 3 M. =
TONKIN= NE 5-6, S 6 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S 2 M. =
DANANG= NE 5, S 6 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 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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    • SOUTH CHINA COASTAL WATERS
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    Bulletin issued at 09:30 HKT 27/Aug/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 27 August 2017

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

    Weather Situation:
    At 9 a.m., Severe Tropical Storm Pakhar with maximum sustained winds of about 110 kilometres per hour near its centre was located at 21.9 degrees north, 113.4 degrees east. It is forecast to move north-northwest at about 28 kilometres per hour towards the west of the Pearl River Estuary.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Southeast up to force 11, force 6 to 7 later.
    Frequent heavy squally showers and thunderstorms.
    Very high seas.

    Nan'ao:
    South to southeast force 5 to 6, up to force 7 at first.
    Frequent heavy squally showers and thunderstorms.
    Moderate to rough seas.

    Shanwei:
    South to southeast force 6 to 7, up to force 8 at first.
    Frequent heavy squally showers and thunderstorms.
    High seas.

    South of Hong Kong:
    South to southeast up to force 11, becoming force 9.
    Frequent heavy squally showers and thunderstorms.
    Very high seas.

    Shangchuan Dao:
    Cyclonic up to force 11, becoming south to southeast force 9.
    Frequent heavy squally showers and thunderstorms.
    Very high seas.

    Outlook for the next 48 hours
    South to southeasterly winds of force 5 to 6. Squally showers and thunderstorms.

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

    Waglan Island Wind southeast force 9
      Visibility 2100 Metres

    Shantou Wind east force 2
      Visibility 30 Kilometres

    Dongsha Wind south-southeast force 5
      Visibility 9 Kilometres

    Macau Wind east force 7
      Visibility 9 Kilometres

    Xisha Wind south-southwest force 4
      Visibility 28 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
  • Descriptive Terms of Wind Speeds
  • Visibility Readings in Hong Kong Waters
  • Map showing forecast areas
  • Tidal Information

    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 27/AUG/2017
    (Next update at 9:00-9:30 HKT 27/AUG/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     SEV TURB AND SEV GUSTS.  
     STORM FORCE WINDS. 
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 1 A.M.,  SEVERE TROPICAL STORM PAKHAR WAS
     CENTRED AT 20.3 DEGREES NORTH, 115.3 DEGREES
     EAST. IT IS FORECAST TO MOVE NORTHWEST AT ABOUT
     16 KNOTS CLOSER TO THE COAST OF GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  040/20-25G35
                  BECMG 120/25-35G45
                  TEMPO VRB/25G40 IN TS
       OFFSHORE:  040/30-40G50
                  BECMG 150/45-50G60                   25-28
   B.   2000 FT:  070/30-35G50
                  BECMG 150/45-55G65                   22
   C.   5000 FT:  090/40
                  BECMG 120/50                         19
   D.  10000 FT:  080/40
                  BECMG 120/45                         11
   E.  18000 FT:  090/35
                  BECMG 130/45                         MS2
   F.  24000 FT:  090/25
                  BECMG 110/45                         MS12
   G.  30000 FT:  120/25
                  BECMG 130/45                         MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH OCCASIONAL HEAVY SQUALLY SHOWERS
      AND ISOLATED THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT  SCT 3500 FT TEMPO FEW 800 FT CB
      SCT 2000 FT BKN 5000 FT
   K. VISIBILITY    : 9 KM.  TEMPO 2500 M IN SHOWERS. TEMPO 1500 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 10200 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 4.0-12.0 M    SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     STRONG TO OCCASIONALLY GALE SOUTHEASTERLY WINDS,
     STORM FORCE OFFSHORE, BECOMING MODERATE TO FRESH
     SOUTHEASTERLY WINDS.  CLOUDY WITH OCCASIONAL
     HEAVY SQUALLY SHOWERS AND 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 09:35 HKT on 27 Aug 17

    VHHK SIGMET 1 VALID 270135/270500 VHHH- VHHK HONG KONG FIR EMBD TS FCST W OF LINE N2318 E11618 - N2006 E11648 TOP FL500 MOV W 15KT NC= VHHK SIGMET 21 VALID 262220/270300 VHHH- VHHK HONG KONG FIR TC PAKHAR PSN N2112 E11406 CB OBS AT 2100Z WI 180NM OF TC CENTRE TOP FL500 NC FCST AT 0300Z TC CENTRE PSN N2154 E11242=

    Please click here for more about the SIGMET

    TROPICAL CYCLONE WARNING Skip to main content
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    Tropical Cyclone Warnings

    Bulletin issued at 08:45 HKT 27/Aug/2017

    Tropical Cyclone Warning Bulletin

    Here is the latest Tropical Cyclone Warning Bulletin issued by the Hong Kong Observatory.

    The No. 8 Southeast Gale or Storm Signal is in force.

    This means that winds with mean speeds of 63 kilometres per hour or more are expected from the southeast quarter.

    At 9 a.m., Severe Tropical Storm Pakhar was centred about 90 kilometres west-southwest of Hong Kong Observatory (near 21.9 degrees north 113.4 degrees east) and is forecast to move north-northwest at about 28 kilometres per hour towards the west of the Pearl River Estuary.

    In the past hour, winds occasionally reached storm force in the southwestern part of Hong Kong and occasionally reached hurricane force on high ground of Lantau Island. Pakhar will land to the west of the Pearl River Estuary in the next couple of hours. The Gale or Storm Signal No. 8 is expected to persist this morning.

    Rainbands associated with Pakhar are bringing occasional heavy showers and squalls to Hong Kong. There may be flooding in low-lying areas. Seas will be very rough with swells. Members of the public are advised to stay away from the shoreline and not to engage in water sports.

    In the past hour, the maximum sustained winds recorded at Ngong Ping, Cheung Chau and Chek Lap Kok were 130, 103 and 72 kilometres per hour with maximum gusts 173, 121 and 102 kilometres per hour respectively.

    (Precautionary Announcements with No. 8 Signal)

    1. Flights at Hong Kong International Airport may be affected by the weather. Please contact your airline for the latest flight information before departing for the airport.

    2. Lock all windows and doors, fit bars into position and insert reinforced shutters and gates if they are available. Adhesive tape fixed to large window-panes in exposed positions will reduce damage by broken glass. Storm water drains should be cleared of leaves and rubbish.

    3. Park your car where it is least likely to be damaged.

    4. Do not stand near windows on the exposed side of your home. Move all furniture and valuables away from these areas. Make sure you have a safe place to shelter, should windows be broken.

    5. Please listen to radio or watch TV for the latest weather information broadcast. You can also browse the Hong Kong Observatory's web site for the information.
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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 09:30 HKT 27/Aug/2017


    Tropical Cyclone Warning

    At 270000 UTC, Severe Tropical Storm Pakhar (1714) with central pressure 975 hectopascals was centred within 60 nautical miles of two one point eight degrees north (21.8 N) one one three point four degrees east (113.4 E) and is forecast to move north-northwest at about 15 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 60 knots.

    Radius of over 33 knot winds 90 nautical miles.
    Radius of over 47 knot winds 60 nautical miles.
    Radius of over 2 metre waves 180 nautical miles.

    Forecast position and intensity at 280000 UTC
    Two three point eight degrees north (23.8 N)
    One zero eight point zero degrees east (108.0 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 290000 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
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    Yesterday's Weather and Radiation Level

    Bulletin issued at 00:15 HKT 27/Aug/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     34.3 C
Minimum Air Temperature                     26.2 C
Grass Minimum Temperature                   25.7 C
Relative Humidity                        56 - 93 Percent
Rainfall                                     6.3 mm 
Total rainfall since 1st January          1980.8 mm
Against an average of                     1857.7 mm

Other Stations                Min                  Max
King's Park                  25.9 C               33.3 C
Wong Chuk Hang               26.9 C               33.8 C
Ta Kwu Ling                  24.7 C               34.8 C
Lau Fau Shan                 25.8 C               35.1 C
Tai Po                       25.7 C               33.2 C
Sha Tin                      26.6 C               33.9 C
Tuen Mun                     25.7 C               34.4 C
Tseung Kwan O                25.7 C               33.5 C
Sai Kung                     26.9 C               33.1 C
Cheung Chau                  25.1 C               34.2 C
Chek Lap Kok                 27.1 C               36.1 C
Tsing Yi                     26.4 C               34.9 C
Shek Kong                    25.2 C               35.5 C
Tsuen Wan Ho Koon            24.7 C               33.8 C
Tsuen Wan Shing Mun Valley   25.5 C               34.2 C
Hong Kong Park               25.8 C               33.9 C
Shau Kei Wan                 25.7 C               32.1 C
Kowloon City                 25.5 C               33.8 C
Happy Valley                 27.0 C               34.2 C
Wong Tai Sin                 25.9 C               33.7 C
Stanley                      26.3 C               32.7 C
Kwun Tong                    25.8 C               32.6 C
Sham Shui Po                 26.3 C               34.1 C
Kai Tak Runway Park          26.5 C               32.2 C
Yuen Long Park               25.9 C               35.7 C

Duration of sunshine (King's Park):              9.9 H
The mean UV index recorded at King's Park yesterday was 6,
the UV intensity was High.
The maximum UV index for yesterday was 11.
Sea surface temperature (Waglan Island):        25.8 C 

Yesterday's (26 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                         0.11
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 26 Aug
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