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Bulletin issued at 17:02 HKT 26/Aug/2017

At 5 p.m. at the Hong Kong Observatory the air temperature was 31 degrees Celsius and the relative humidity 69 per cent.
During the past hour the mean UV Index recorded at King's Park was 2. The intensity of UV radiation was low.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.
The Very Hot Weather Warning is now in force. Very hot weather might cause adverse health effects. Members of the public should take care to avoid heatstroke.

The air temperatures at other places were:

King's Park 30 degrees;
Wong Chuk Hang 31 degrees;
Ta Kwu Ling 31 degrees;
Lau Fau Shan 31 degrees;
Tai Po 30 degrees;
Sha Tin 31 degrees;
Tuen Mun 33 degrees;
Tseung Kwan O 30 degrees;
Sai Kung 30 degrees;
Cheung Chau 30 degrees;
Chek Lap Kok 33 degrees;
Tsing Yi 31 degrees;
Shek Kong 32 degrees;
Tsuen Wan Ho Koon 31 degrees;
Tsuen Wan Shing Mun Valley 31 degrees;
Hong Kong Park 30 degrees;
Shau Kei Wan 29 degrees;
Kowloon City 30 degrees;
Happy Valley 31 degrees;
Wong Tai Sin 31 degrees;
Stanley 30 degrees;
Kwun Tong 30 degrees;
Sham Shui Po 32 degrees;
Kai Tak Runway Park 30 degrees;
Yuen Long Park 33 degrees.

Here is the information on Tropical Storm Pakhar:
Location: 18.7 degrees north, 117.6 degrees east; Maximum sustained wind near its centre: 75 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 16:45 HKT 26/Aug/2017

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

Weather forecast for tonight and tomorrow

Becoming cloudy with heavy squally showers. Moderate to fresh east to northeasterly winds, strengthening gradually. Becoming southeasterly winds tomorrow. 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 09:00 HKT 26/Aug/2017

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

GENERAL SITUATION AT 252100 UTC:
FOR DETAILS ON TROPICAL STORM PAKHAR (1714), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 260100 UTC:

HONG KONG= E 4-5, N TO NE UP TO 8 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2 M, UP TO 6 M LATER. SWELL SE 2-3 M. TEMP 33-27 C. =
KWANGTUNG= E 6-7, CYCLONIC 11 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, 12 M LATER. SWELL SE 3 M. =
TAIWAN STRAIT= NE 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 7-8, OCNL 9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 8 M. SWELL SE 3 M. =
PRATAS= E TO SE 5-6, BEC CYCLONIC UP TO 11. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 12 M LATER. SWELL E TO NE 3 M. =
BALINTANG= CYCLONIC 8-9, SE UP TO 10 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, UP TO 10 M LATER. SWELL SE 3 M. =
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 NE 3 M. =
PARACEL= E 5-6, CYCLONIC UP TO 11 LATER. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 12 M LATER. SWELL SE 2 M, NE 3 M LATER. =
TONKIN= E TO NE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S 2 M. =
DANANG= E TO NE 5-6. 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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    South China Coastal Waters

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    Bulletin issued at 16:30 HKT 26/Aug/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 26 August 2017

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

    Weather Situation:
    At 4 p.m., Tropical Storm Pakhar with maximum sustained winds of about 75 kilometres per hour near its centre was located at 18.4 degrees north, 117.7 degrees east. It is forecast to move northwest at about 30 kilometres per hour across the northern part of the South China Sea and intensify gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to northeast up to force 6, becoming force 9, becoming southeast up to force 7 tomorrow.
    Heavy squally showers and thunderstorms.
    Rough seas, becoming very rough seas.

    Nan'ao:
    Northeast up to force 9, becoming force 10 to 11.
    Frequent heavy squally showers and thunderstorms.
    Very rough seas, becoming very high seas.

    Shanwei:
    Northeast up to force 9, becoming cyclonic force 11.
    Frequent heavy squally showers and thunderstorms.
    Rough seas, becoming very high seas.

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

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

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

    Waglan Island Wind east force 5
      Visibility 17 Kilometres

    Shantou Wind east force 2
      Visibility 30 Kilometres

    Dongsha Wind east-northeast force 6
      Visibility 10 Kilometres

    Macau Wind east force 3
      Visibility 35 Kilometres

    Xisha Wind east force 3
      Visibility 30 Kilometres

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

    Bulletin issued at 10:17 HKT 26/AUG/2017
    (Next update at 17:30 HKT 26/AUG/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB. 
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN EASTERLY AIRSTREAM IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS.
     AT 8 A.M., TROPICAL STORM PAKHAR WAS LOCATED AT
     17.6 DEGREES NORTH, 120.1 DEGREES EAST.  IT IS
     FORECAST TO MOVE NORTHWEST AT ABOUT 15 KNOTS
     ENTERING THE SOUTH CHINA SEA AND INTENSIFYING
     GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  090/5-10
                  BECMG 040/10-15
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  070/10-15
                  BECMG 070/20-25                      30-34
   B.   2000 FT:  070/15-20
                  BECMG 070/25-30                      23
   C.   5000 FT:  090/20-25
                  BECMG 070/25-30                      20
   D.  10000 FT:  090/25                               12
   E.  18000 FT:  070/20-25                            MS4
   F.  24000 FT:  050/20
                  BECMG 120/20                         MS15
   G.  30000 FT:  070/20
                  BECMG 160/20                         MS30
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE 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 BKN 5000 FT
   K. VISIBILITY    : 10 KM.  TEMPO 3000 M IN SHOWERS. TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 10400 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS, OFFSHORE AND NEAR HILLS
   N. SEA STATE     : 1.0-3.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     FRESH NORTHEASTERLY WINDS, STRONG OFFSHORE.
     CLOUDY WITH 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 15:48 HKT on 26 Aug 17

    VHHK SIGMET 6 VALID 260600/261000 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1642 E11400 - N1818 E11236 - N2230 E11606 - N2236 E11730 - N2100 E11730 TOP FL400 MOV WSW 10KT NC= VHHK SIGMET 4 VALID 261300/261900 VHHH- VHHK HONG KONG FIR TC PAKHAR PSN N1942 E11630 CB FCST AT 1315Z WI 180NM OF TC CENTRE TOP FL450 INTSF FCST AT 1900Z TC CENTRE PSN N2030 E11506= VHHK SIGMET 7 VALID 261300/261900 VHHH- VHHK HONG KONG FIR TC PAKHAR PSN N1930 E11618 CB OBS AT 1300Z WI 180NM OF TC CENTRE TOP FL450 INTSF FCST AT 1900Z TC CENTRE PSN N2036 E11442=

    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 16:45 HKT 26/Aug/2017

    Tropical Cyclone Warning Bulletin

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

    The Standby Signal, No. 1 is in force.

    This means that a tropical cyclone now centred within about 800 kilometres of Hong Kong may affect us.

    At 5 p.m., Tropical Storm Pakhar was estimated to be about 540 kilometres southeast of Hong Kong (near 18.7 degrees north 117.6 degrees east) and is forecast to move northwest at about 30 kilometres per hour across the northern part of the South China Sea and intensify gradually.

    Pakhar is moving relatively fast, but its location in the past few hours was relatively south of the forecast position. With Pakhar edging closer to the coast of Guangdong, local winds will strengthen progressively tonight to early morning tomorrow (Sunday). The Observatory will consider issuing the Strong Wind Signal No. 3 before midnight tonight.

    According to the present track, Pakhar will be closest to Hong Kong during the day tomorrow and skirt within about 200 kilometres southwest of the territory. The need to issue the Gale or Storm Signal No. 8 will depend on the intensity change of Pakhar and its distance from Hong Kong.

    Rainbands associated with Pakhar will progressively affect the coast of Guangdong. Local weather will deteriorate significantly with squally heavy showers tomorrow. There may be flooding in low-lying areas. Seas will be rough with swells. Members of the public are advised to take precautions against strong winds and clear storm water drains to avoid flooding as soon as possible. Please also complete all clearing and recovery works in relation to Hato as early as possible.

    (Precautionary Announcements with No. 1 Signal)

    1. You are advised not to delay in taking all precautions to protect your home or property. Make sure now that all loose objects are secure. Porch furniture, flower pots and other objects likely to be blown away should be taken indoors. Check again and make sure all windows and doors can be securely locked.

    2. Storm water drains should be cleared of leaves and rubbish, this applies particularly to dwellers in low-lying areas.

    3. Engineers, architects and contractors should make sure that scaffoldings, hoardings and other temporary structures are secured.

    4. All small vessels including low power vessels and fishing vessels in open sea should seek shelter as soon as possible. Please take any precautions necessary for small vessels and secure them properly with moorings.

    5. Listen to radio, watch TV or browse the Hong Kong Observatory's web site for information on the tropical cyclone.
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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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    South China Coastal Waters |  Marine Forecast
    Severe Weather Information Centre

    Bulletin issued at 15:30 HKT 26/Aug/2017


    Tropical Cyclone Warning

    At 260600 UTC, Tropical Storm Pakhar (1714) with central pressure 980 hectopascals was centred within 90 nautical miles of one eight point two degrees north (18.2 N) one one eight point one degrees east (118.1 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 40 knots.

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

    Forecast position and intensity at 270600 UTC
    Two one point nine degrees north (21.9 N)
    One one two point zero degrees east (112.0 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 280600 UTC
    Two three point seven degrees north (23.7 N)
    One zero seven point three degrees east (107.3 E)
    Maximum winds 25 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 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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