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Bulletin issued at 11:02 HKT 02/Sep/2017

At 11 a.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 76 per cent.
During the past hour the mean UV Index recorded at King's Park was 5. The intensity of UV radiation was moderate.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.

The air temperatures at other places were:

King's Park 29 degrees;
Wong Chuk Hang 29 degrees;
Ta Kwu Ling 31 degrees;
Lau Fau Shan 29 degrees;
Tai Po 30 degrees;
Sha Tin 32 degrees;
Tuen Mun 29 degrees;
Tseung Kwan O 30 degrees;
Sai Kung 30 degrees;
Cheung Chau 28 degrees;
Chek Lap Kok 30 degrees;
Tsing Yi 29 degrees;
Shek Kong 30 degrees;
Tsuen Wan Ho Koon 29 degrees;
Tsuen Wan Shing Mun Valley 30 degrees;
Hong Kong Park 30 degrees;
Shau Kei Wan 31 degrees;
Kowloon City 30 degrees;
Happy Valley 31 degrees;
Wong Tai Sin 30 degrees;
Stanley 28 degrees;
Kwun Tong 30 degrees;
Sham Shui Po 30 degrees;
Kai Tak Runway Park 30 degrees;
Yuen Long Park 31 degrees;
Tai Mei Tuk 32 degrees.

Here is the information on Tropical Storm Mawar:
Location: 21.3 degrees north, 117.2 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 2 Sep

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 10:45 HKT 02/Sep/2017

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

Weather forecast for today

A few showers and sunny intervals. Showers will be heavier at times with squally thunderstorms later. Moderate northerly winds, fresh offshore later.

Outlook : Windier with occasional squally showers in the next couple of days.


(The above forecast period is valid up to 23:59 HKT today, 02/09/2017; 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 02/Sep/2017

STORM WARNING AREAS: KWANGTUNG, BASHI AND PRATAS.
GALE WARNING AREAS: TAIWAN STRAIT AND BALINTANG.

GENERAL SITUATION AT 012100 UTC:
FOR DETAILS ON TROPICAL STORM MAWAR (1716), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 020100 UTC:

HONG KONG= NW 5-6, 7 LATER. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M, 4 M LATER. SWELL NE 2 M, 3 M LATER. TEMP 31-26 C. =
KWANGTUNG= W TO NW 7-8, CYCLONIC UP TO 10 IN E. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, BEC 10 M IN E. SWELL E TO NE 3 M, S 3 M. =
TAIWAN STRAIT= NE 7-8, OCNL 9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 8 M. SWELL SE 3 M. =
BASHI= S TO SW 8-9, OCNL 10. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 10 M. SWELL NE 3 M, S 3 M. =
PRATAS= CYCLONIC 8-9, OCNL 10. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 10 M. SWELL NE 3 M, S 3 M. =
BALINTANG= SW 7-8, OCNL 9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 8 M. SWELL NE 3 M, S 3 M. =
SCARBOROUGH= SW 6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL S 2-3 M. =
PARACEL= W TO NW 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 2-3 M. =
TONKIN= SW 5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2 M. SWELL E TO NE 2 M. =
DANANG= SW 5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2 M. SWELL E TO NE 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.


  • Map showing the 10 forecast areas
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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 09:30 HKT 02/Sep/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 02 September 2017

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

    Weather Situation:
    At 9 a.m., Tropical Storm Mawar with maximum sustained winds of about 85 kilometres per hour near its centre was located near 21.3 degrees north, 117.3 degrees east. It is forecast to move north-northwest slowly in the general direction of the coast of eastern Guangdong and strengthen gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Northwest force 5 to 6, force 7 later.
    Scattered heavy squally showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao:
    Cyclonic force 8 to 9, up to force 10 later.
    Frequent heavy squally showers and thunderstorms.
    Very rough to high seas.

    Shanwei:
    Northwest force 8 to 9, becoming southwest up to force 10 later.
    Frequent heavy squally showers and thunderstorms.
    Very rough to high seas.

    South of Hong Kong:
    West to northwest force 6 to 7.
    Occasional heavy squally showers and thunderstorms.
    Rough seas.

    Shangchuan Dao:
    West to northwest force 5 to 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    Southwesterly winds of force 7 to 8, cyclonic winds up to force 12 in east at first. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind west force 3
      Visibility 11 Kilometres

    Shantou Wind northeast force 1
      Visibility 30 Kilometres

    Macau Wind north force 1
      Visibility 7 Kilometres

    Xisha Wind southwest force 4
      Visibility 21 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 09:30 HKT 02/SEP/2017
    (Next update at 17:30 HKT 02/SEP/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 9 A.M., TROPICAL STORM MAWAR WAS CENTRED NEAR
     21.3 DEGREES NORTH 117.3 DEGREES EAST AND IS
     FORECAST TO MOVE NORTH-NORTHWEST SLOWLY IN THE
     GENERAL DIRECTION OF THE COAST OF EASTERN
     GUANGDONG AND STRENGTHEN GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  340/5-10 BEC 320/15
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  340/15 BEC 320/20-25                 28-33
   B.   2000 FT:  350/15-20                            25
   C.   5000 FT:  350/15                               20
   D.  10000 FT:  360/20                               11
   E.  18000 FT:  050/20                               MS2
   F.  24000 FT:  070/20                               MS12
   G.  30000 FT:  080/25                               MS24
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS AND SQUALLY
      THUNDERSTORMS.  SHOWERS WILL BE HEAVIER AT
      TIMES LATER.  LOCALIZED HAZE/MIST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT  SCT 4000 FT.  TEMPO FEW CB 1000 FT
      SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 4000 M IN SHOWERS/HAZE/MIST.
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 10600 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS AND OFFSHORE.
                      MOD NEAR HILLS.
   N. SEA STATE     : 1.5 BEC 3.0 M   SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     FRESH TO STRONG NORTHWESTERLY WINDS.  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 09:35 HKT on 02 Sep 17

    VHHK SIGMET 11 VALID 012320/020320 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1812 E11512 - N1806 E11512 - N1842 E11218 - N2124 E11342 - N1930 E11342 - N1812 E11512 TOP FL450 STNR INTSF= VHHK SIGMET 1 VALID 020135/020600 VHHH- VHHK HONG KONG FIR TC MAWAR PSN N2118 E11718 CB OBS AT 0000Z WI 210NM OF TC CENTRE TOP FL450 INTSF FCST AT 0600Z TC CENTRE PSN N2130 E11706= VHHK SIGMET 10 VALID 012235/020300 VHHH- VHHK HONG KONG FIR TC MAWAR PSN N2112 E11730 CB OBS AT 2100Z WI 210NM OF TC CENTRE TOP FL450 INTSF FCST AT 0300Z TC CENTRE PSN N2130 E11724=

    Please click here for more about the SIGMET

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    Tropical Cyclone Warnings

    Bulletin issued at 10:45 HKT 02/Sep/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 11 a.m., Tropical Storm Mawar was estimated to be about 330 kilometres east-southeast of Hong Kong (near 21.3 degrees north 117.2 degrees east) and is forecast to move north-northwest slowly in the general direction of the coast of eastern Guangdong and strengthen gradually.
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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 02/Sep/2017


    Tropical Cyclone Warning

    At 020000 UTC, Tropical Storm Mawar (1716) with central pressure 988 hectopascals was centred within 60 nautical miles of two one point three degrees north (21.3 N) one one seven point three degrees east (117.3 E) and is forecast to move north-northwest slowly for the next 24 hours.

    Maximum winds near the centre are estimated to be 45 knots.

    Radius of over 33 knot winds 90 nautical miles over northern semicircle, 60 nautical miles elsewhere.
    Radius of over 2 metre waves 150 nautical miles.

    Forecast position and intensity at 030000 UTC
    Two two point five degrees north (22.5 N)
    One one six point eight degrees east (116.8 E)
    Maximum winds 60 knots.

    Forecast position and intensity at 040000 UTC
    Two three point seven degrees north (23.7 N)
    One one five point seven degrees east (115.7 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 050000 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 02/Sep/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.7 C
Minimum Air Temperature                     26.1 C
Grass Minimum Temperature                   24.7 C
Relative Humidity                        68 - 98 Percent
Rainfall                                     6.5 mm 
Total rainfall since 1st January          2255.4 mm
Against an average of                     1918.8 mm

Other Stations                Min                  Max
King's Park                  25.6 C               32.1 C
Wong Chuk Hang               24.6 C               32.7 C
Ta Kwu Ling                  24.8 C               33.6 C
Tai Po                       24.8 C               32.1 C
Sha Tin                      25.7 C               33.5 C
Tuen Mun                     25.2 C               33.4 C
Tseung Kwan O                24.8 C               33.4 C
Sai Kung                     25.5 C               32.5 C
Cheung Chau                  24.8 C               34.3 C
Chek Lap Kok                 24.8 C               33.6 C
Tsing Yi                     24.9 C               33.4 C
Shek Kong                    24.5 C               34.2 C
Tsuen Wan Ho Koon            23.8 C               31.8 C
Tsuen Wan Shing Mun Valley   24.1 C               33.1 C
Hong Kong Park               24.9 C               32.0 C
Shau Kei Wan                 25.1 C               33.6 C
Kowloon City                 25.3 C               33.6 C
Happy Valley                 25.5 C               34.0 C
Wong Tai Sin                 24.3 C               34.0 C
Stanley                      25.6 C               32.0 C
Kwun Tong                    24.9 C               33.4 C
Sham Shui Po                 25.7 C               33.4 C
Kai Tak Runway Park          25.7 C               33.5 C
Yuen Long Park               25.3 C               35.1 C
Tai Mei Tuk               24.9 C               33.1 C

Duration of sunshine (King's Park):              2.4 H
The mean UV index recorded at King's Park yesterday was 2,
the UV intensity was Low.
The maximum UV index for yesterday was 7.
Sea surface temperature (Waglan Island):        27.2 C 

Yesterday's (01 Sep 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                         0.12
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 01 Sep
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