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Bulletin issued at 13:02 HKT 26/Aug/2017

At 1 p.m. at the Hong Kong Observatory the air temperature was 33 degrees Celsius and the relative humidity 60 per cent.
During the past hour the mean UV Index recorded at King's Park was 11. The intensity of UV radiation was extreme. The public is advised to avoid prolonged exposure under the sun to prevent damage to skin and eyes.

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 33 degrees;
Wong Chuk Hang 33 degrees;
Ta Kwu Ling 34 degrees;
Lau Fau Shan 35 degrees;
Tai Po 32 degrees;
Sha Tin 33 degrees;
Tuen Mun 33 degrees;
Tseung Kwan O 33 degrees;
Sai Kung 33 degrees;
Cheung Chau 34 degrees;
Chek Lap Kok 35 degrees;
Tsing Yi 34 degrees;
Shek Kong 35 degrees;
Tsuen Wan Ho Koon 32 degrees;
Tsuen Wan Shing Mun Valley 33 degrees;
Hong Kong Park 33 degrees;
Shau Kei Wan 31 degrees;
Kowloon City 33 degrees;
Happy Valley 33 degrees;
Wong Tai Sin 33 degrees;
Stanley 32 degrees;
Kwun Tong 32 degrees;
Sham Shui Po 33 degrees;
Kai Tak Runway Park 32 degrees;
Yuen Long Park 35 degrees.

Here is the information on Tropical Storm Pakhar:
Location: 18.1 degrees north, 118.7 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 12:45 HKT 26/Aug/2017

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

Weather forecast for this afternoon and tonight

Mainly fine and very hot. One or two showers later. Moderate easterly winds, becoming northeasterly winds gradually, fresh offshore.

Outlook : Windy with heavy squally showers in the next 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 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 12:30 HKT 26/Aug/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 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 noon, Tropical Storm Pakhar with maximum sustained winds of about 65 kilometres per hour near its centre was located at 18.1 degrees north, 119.0 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 force 5 to 6, becoming north to northeast up to force 8 later.
    Occasional squally showers and thunderstorms.
    Rough seas, becoming very rough later.

    Nan'ao:
    Northeast force 7 to 8, becoming force 10 to 11.
    Frequent heavy squally showers and thunderstorms.
    Very rough seas, becoming very high.

    Shanwei:
    Northeast force 6 to 7, becoming cyclonic force 11.
    Frequent heavy squally showers and thunderstorms.
    Rough seas, becoming very high.

    South of Hong Kong and Shangchuan Dao:
    East to northeast force 6 to 7, becoming cyclonic force 11 later.
    Frequent heavy squally showers and thunderstorms.
    Rough seas, becoming very high later.

    Outlook for the next 48 hours
    Cyclonic winds of force 10 to 11, becoming 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-northeast force 4
      Visibility 46 Kilometres

    Dongsha Wind northeast force 4
      Visibility 10 Kilometres

    Macau Wind north-northeast force 2
      Visibility 18 Kilometres

    Xisha Wind east force 3
      Visibility 30 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
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  • 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.

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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 13:25 HKT on 26 Aug 17

    VHHK SIGMET 2 VALID 260205/260600 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1730 E11436 - N1924 E11254 - N2254 E11648 - N2300 E11730 - N2100 E11730 TOP FL450 MOV WSW 10KT NC= VHHK SIGMET 1 VALID 261230/261830 VHHH- VHHK HONG KONG FIR TC PAKHAR PSN N1948 E11630 CB FCST AT 1230Z WI 180NM OF TC CENTRE TOP FL500 INTSF FCST AT 1830Z TC CENTRE PSN N2030 E11500= 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=

    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 12:45 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 1 p.m., Tropical Storm Pakhar was estimated to be about 660 kilometres southeast of Hong Kong (near 18.1 degrees north 118.7 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.
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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 12:35 HKT 26/Aug/2017


    Tropical Cyclone Warning

    At 260300 UTC, Tropical Storm Pakhar (1714) with central pressure 980 hectopascals was centred within 90 nautical miles of one seven point eight degrees north (17.8 N) one one nine point one degrees east (119.1 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 45 nautical miles.
    Radius of over 2 metre waves 120 nautical miles.

    Forecast position and intensity at 270300 UTC
    Two one point three degrees north (21.3 N)
    One one three point one degrees east (113.1 E)
    Maximum winds 60 knots.

    Forecast position and intensity at 280300 UTC
    Two three point zero degrees north (23.0 N)
    One zero eight point five degrees east (108.5 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 290300 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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