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Bulletin issued at 22:02 HKT 26/Aug/2017

At 10 p.m. at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 69 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 3 has been issued.
The Thunderstorm Warning has been issued. It will remain effective until 11:30 p.m. today. Isolated thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 29 degrees;
Wong Chuk Hang 30 degrees;
Ta Kwu Ling 28 degrees;
Lau Fau Shan 27 degrees;
Tai Po 29 degrees;
Sha Tin 29 degrees;
Tuen Mun 29 degrees;
Tseung Kwan O 29 degrees;
Sai Kung 30 degrees;
Cheung Chau 29 degrees;
Chek Lap Kok 30 degrees;
Tsing Yi 30 degrees;
Shek Kong 27 degrees;
Tsuen Wan Ho Koon 28 degrees;
Tsuen Wan Shing Mun Valley 29 degrees;
Hong Kong Park 30 degrees;
Shau Kei Wan 29 degrees;
Kowloon City 29 degrees;
Happy Valley 30 degrees;
Wong Tai Sin 29 degrees;
Stanley 29 degrees;
Kwun Tong 29 degrees;
Sham Shui Po 30 degrees;
Kai Tak Runway Park 30 degrees;
Yuen Long Park 28 degrees;
Tai Mei Tuk 28 degrees.

Here is the information on Severe Tropical Storm Pakhar:
Location: 19.7 degrees north, 116.5 degrees east; Maximum sustained wind near its centre: 90 km/h.


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


Climatological Information for 26 Aug

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 21:45 HKT 26/Aug/2017

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

Weather forecast for tonight and tomorrow

Strong northeasterly winds, strengthening gradually. Becoming southeasterly winds tomorrow. Cloudy with squally showers. Showers will be heavy at times. Thunderstorms at first. Seas will be rough with swells. Temperatures will range between 26 and 30 degrees.

Outlook : There will still be heavy squally showers at first on Monday. Weather will improve in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 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 21:00 HKT 26/Aug/2017

STORM WARNING AREAS: HONG KONG, KWANGTUNG, PRATAS AND PARACEL.
GALE WARNING AREAS: BASHI, BALINTANG AND SCARBOROUGH.

GENERAL SITUATION AT 260900 UTC:
FOR DETAILS ON TROPICAL STORM PAKHAR (1714), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 261300 UTC:

HONG KONG= NE 7-8, BEC SE UP TO 11 TOMORROW. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, BEC 12 M. SWELL SE 3-5 M. TEMP 26-29 C. =
KWANGTUNG= E TO NE UP TO 9, BEC CYCLONIC 11. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 8 M, BEC 12 M. SWELL SE 3-5 M. =
TAIWAN STRAIT= SE 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL SE 2 M. =
BASHI= E TO SE 7, UP TO 8 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL SE 3 M. =
PRATAS= CYCLONIC 11, BEC SE UP TO 9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 12 M. SWELL SE 3-5 M. =
BALINTANG= E TO SE 7, UP TO 8 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL SE 3 M. =
SCARBOROUGH= S TO SE 7-8, UP TO 9 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 8 M. SWELL S 3 M. =
PARACEL= E TO NE UP TO 9, BEC CYCLONIC 11. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 8 M, BEC 12 M. SWELL E TO NE 3-5 M. =
TONKIN= E TO NE 5-6, S UP TO 7 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 4 M LATER. SWELL S 2 M. =
DANANG= E TO NE 5-6, S UP TO 7 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 4 M LATER. 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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    South China Coastal Waters

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    Bulletin issued at 20:25 HKT 26/Aug/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 8:25 p.m. on 26 August 2017

    Warnings:
    Storm force winds in all areas.

    Weather Situation:
    Tropical Storm Pakhar has intensified into a severe tropical storm. At 8 p.m., Pakhar with maximum sustained winds of about 90 kilometres per hour near its centre was located at 19.3 degrees north, 116.8 degrees east. It is forecast to move northwest at about 30 kilometres per hour towards the coast of Guangdong gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Northeast force 7 to 8, becoming southeast up to force 11 tomorrow.
    Frequent heavy squally showers and thunderstorms.
    Very rough seas, becoming high seas.

    Nan'ao:
    Southeast up to force 9, becoming force 11.
    Frequent heavy squally showers and thunderstorms.
    High seas, becoming very high seas.

    Shanwei, South of Hong Kong and Shangchuan Dao:
    East to northeast up to force 9, becoming cyclonic force 11.
    Frequent heavy squally showers and thunderstorms.
    High seas, becoming very high seas.

    Outlook for the next 48 hours
    Southeasterly winds of force 7 to 8. Heavy squally showers and thunderstorms.

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

    Waglan Island Wind east-northeast force 7
      Visibility 12 Kilometres

    Shantou Wind east force 2
      Visibility 30 Kilometres

    Dongsha Wind east-northeast force 5
      Visibility 8 Kilometres in rain

    Macau Wind east force 2
      Visibility 50 Kilometres or above

    Xisha Wind east-northeast force 2
      Visibility 30 Kilometres

  • Explanation of Seas or Sea Waves
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  • Descriptive Terms of Wind Speeds
  • Visibility Readings in Hong Kong Waters
  • Map showing forecast areas
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 20:00 HKT 26/AUG/2017
    (Next update at 01:30 HKT 27/AUG/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     GALE FORCE WINDS,SEV TURB AND SEV GUSTS.  
     CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     TROPICAL STORM PAKHAR HAS INTENSIFIED INTO A
     SEVERE TROPICAL STORM.
     AT 8 P.M., PAKHAR WAS CENTRED AT 19.3 DEGREES
     NORTH, 116.8 DEGREES EAST. IT IS FORECAST TO
     MOVE NORTHWEST AT ABOUT 16 KNOTS TOWARDS THE
     COAST OF GUANGDONG GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 2000 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  060/10-15
                  BEC 060/20-25
                  TEMPO VRB/25G35 IN TS
       OFFSHORE:  070/20-25
                  BECMG 070/30-35                      30-26
   B.   2000 FT:  070/20-25
                  BECMG 070/30-35                      24
   C.   5000 FT:  070/25-30                            19
   D.  10000 FT:  080/30-35                            11
   E.  18000 FT:  090/25-30                            MS4
   F.  24000 FT:  110/25                               MS14
   G.  30000 FT:  140/20                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH SQUALLY SHOWERS AND 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: 16500 FT      10 DEG. C LEVEL(S) : 10400 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 2.0-5.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     STRONG TO GALE FORCE EAST TO NORTHEASTERLY
     WINDS, BECOMING SOUTHEASTERLY WINDS,
     OCCASIONALLY REACHING STORM FORCE WINDS
     OFFSHORE.  CLOUDY WITH HEAVY SQUALLY SHOWERS AND
     THUNDERSTORMS. CLOUDY WITH 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 21:30 HKT on 26 Aug 17

    VHHK SIGMET 9 VALID 261000/261400 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1642 E11400 - N1900 E11154 - N2248 E11606 - N2312 E11730 - N2100 E11730 TOP FL420 MOV WSW 10KT NC= VHHK SIGMET 10 VALID 261300/261900 VHHH- VHHK HONG KONG FIR TC PAKHAR PSN N1936 E11624 CB FCST AT 1300Z WI 180NM OF TC CENTRE TOP FL450 INTSF FCST AT 1900Z TC CENTRE PSN N2036 E11442= VHHK SIGMET 12 VALID 261330/261800 VHHH- VHHK HONG KONG FIR TC PAKHAR PSN N1936 E11630 CB OBS AT 1315Z WI 210NM OF TC CENTRE TOP FL480 NC FCST AT 1800Z TC CENTRE PSN N2018 E11506=

    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 21:45 HKT 26/Aug/2017

    Tropical Cyclone Warning Bulletin

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

    The Strong Wind Signal, No. 3 is in force.

    This means that winds with mean speeds of 41 to 62 kilometres per hour are expected.

    At 10 p.m., Severe Tropical Storm Pakhar was estimated to be about 380 kilometres southeast of Hong Kong (near 19.7 degrees north 116.5 degrees east) and is forecast to move northwest at about 30 kilometres per hour towards the coast of Guangdong gradually.
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    TROPICAL CYCLONE WARNING FOR SHIPPING
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    Tropical Cyclone Warning for Shipping

    Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
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    Severe Weather Information Centre

    Bulletin issued at 21:30 HKT 26/Aug/2017


    Tropical Cyclone Warning

    Tropical Storm Pakhar (1714) has intensified into a Severe Tropical Storm with central pressure 984 hectopascals. At 261200 UTC, it was centred within 90 nautical miles of one nine point four degrees north (19.4 N) one one six point seven degrees east (116.7 E) and is forecast to move northwest at about 16 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 50 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 271200 UTC
    Two two point five degrees north (22.5 N)
    One one zero point eight degrees east (110.8 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 281200 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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