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Bulletin issued at 19:02 HKT 26/Aug/2017

At 7 p.m. at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 74 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.
The Thunderstorm Warning has been issued. It will remain effective until 8:30 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 30 degrees;
Tseung Kwan O 29 degrees;
Sai Kung 29 degrees;
Cheung Chau 29 degrees;
Chek Lap Kok 30 degrees;
Tsing Yi 29 degrees;
Shek Kong 28 degrees;
Tsuen Wan Ho Koon 28 degrees;
Tsuen Wan Shing Mun Valley 29 degrees;
Hong Kong Park 29 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 29 degrees;
Yuen Long Park 29 degrees;
Tai Mei Tuk 27 degrees.

Between 5:45 and 6:45 p.m., the rainfall recorded in various regions were:

North District 0 to 1 mm.

Here is the information on Tropical Storm Pakhar:
Location: 19.1 degrees north, 117.1 degrees east; Maximum sustained wind near its centre: 85 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

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 18:55 HKT 26/Aug/2017

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

Weather forecast for tonight and tomorrow

Cloudy with squally showers. Showers will be heavy at times. Isolated thunderstorms at first. 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 tomorrow.

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 19:30 HKT 26/Aug/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 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 7 p.m., Tropical Storm Pakhar with maximum sustained winds of about 85 kilometres per hour near its centre was located at 19.1 degrees north, 117.1 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 force 6, becoming force 9, becoming southeast up to force 7 tomorrow.
    Frequent heavy squally showers and thunderstorms.
    Rough seas, becoming very rough seas.

    Nan'ao:
    Southeast up to force 9, becoming force 11.
    Frequent heavy squally showers and thunderstorms.
    Very rough 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.
    Very rough 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 northeast force 6
      Visibility 13 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
  • Explanation of Swells
  • 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 17:30 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 :
     AT 6 P.M., TROPICAL STORM PAKHAR WAS CENTRED AT
     19.0 DEGREES NORTH, 117.4 DEGREES EAST. IT IS
     FORECAST TO MOVE NORTHWEST AT ABOUT 16 KNOTS
     ACROSS THE NORTHERN PART OF THE SOUTH CHINA SEA
     AND INTENSIFY GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 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                      33-26
   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    : 10 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 .  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 18:30 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 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= 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=

    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 18:45 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 7 p.m., Tropical Storm Pakhar was estimated to be about 470 kilometres southeast of Hong Kong (near 19.1 degrees north 117.1 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. With Pakhar edging closer to the coast of Guangdong, local winds will strengthen gradually tonight and early morning tomorrow. The Observatory will consider issuing the Strong Wind Signal No. 3 in the next few hours.

    According to the present track, Pakhar will be closest to Hong Kong during the day tomorrow (Sunday), skirting within about 200 kilometres southwest of the territory. If Pakhar strengthens or adopts a track closer to Hong Kong overnight tonight, the Observatory will not rule out the possibility of issuing the Gale or Storm Signal No. 8 before dawn tomorrow.

    Rainbands associated with Pakhar will progressively affect the coast of Guangdong. Local weather will deteriorate significantly with heavy squally showers tomorrow. There may be flooding in low-lying areas. Seas will be rough with swells. Members of the public are advised to stay away from the shoreline and not to engage in water sports. Please also take precautions against strong winds and clear storm water drains to avoid flooding as soon as possible. All clearing and recovery works in relation to Hato should be completed 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. If you are planning to visit Guangdong, Macau, any of the off-shore islands or remote parts of Hong Kong, you are reminded that changes in weather may affect your plans.

    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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    Severe Weather Information Centre

    Bulletin issued at 18:30 HKT 26/Aug/2017


    Tropical Cyclone Warning

    At 260900 UTC, Tropical Storm Pakhar (1714) with central pressure 988 hectopascals was centred within 90 nautical miles of one eight point nine degrees north (18.9 N) one one seven point four degrees east (117.4 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 45 knots.

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

    Forecast position and intensity at 270900 UTC
    Two two point two degrees north (22.2 N)
    One one one point four degrees east (111.4 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 280900 UTC
    Two three point seven degrees north (23.7 N)
    One zero six point six degrees east (106.6 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 290900 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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