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Bulletin issued at 00:02 HKT 03/Sep/2017

At midnight at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 87 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.

The air temperatures at other places were:

King's Park 27 degrees;
Wong Chuk Hang 26 degrees;
Ta Kwu Ling 27 degrees;
Lau Fau Shan 26 degrees;
Tai Po 27 degrees;
Sha Tin 27 degrees;
Tuen Mun 26 degrees;
Tseung Kwan O 26 degrees;
Sai Kung 27 degrees;
Cheung Chau 25 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 27 degrees;
Shek Kong 26 degrees;
Tsuen Wan Ho Koon 26 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 27 degrees;
Shau Kei Wan 25 degrees;
Kowloon City 26 degrees;
Happy Valley 27 degrees;
Wong Tai Sin 26 degrees;
Stanley 25 degrees;
Kwun Tong 26 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 26 degrees;
Yuen Long Park 27 degrees;
Tai Mei Tuk 27 degrees.

Here is the information on Severe Tropical Storm Mawar:
Location: 21.7 degrees north, 117.1 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 3 Sep

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 00:00 HKT 03/Sep/2017

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

Tropical Cyclone Mawar intensified from a tropical storm into a severe tropical storm yesterday and lingered over the northeastern part of the South China Sea. Its associated rainbands affected the coast of Guangdong. Locally, it was hazy with sunny intervals. There were squally thunderstorms later. More than 20 millimetres of rainfall were recorded over Lantau Island. Mawar is expected to move north-northwest slowly in the general direction of the coast of eastern Guangdong. There will still be squally showers over the region today and tomorrow.

Weather forecast for Hong Kong (Sunday, 3 Sep 2017)

Cloudy with squally showers and thunderstorms. Temperatures will range between 26 and 29 degrees. Moderate northwesterly winds, becoming fresh southwesterlies, strong offshore. There will be swells.

Outlook : There will still be squally showers on Monday. The weather will improve in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 03/09/2017; 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 21:00 HKT 02/Sep/2017

STORM WARNING AREA: KWANGTUNG.
GALE WARNING AREAS: TAIWAN STRAIT AND PRATAS.

GENERAL SITUATION AT 020900 UTC:
FOR DETAILS ON SEVERE TROPICAL STORM MAWAR (1716), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 021300 UTC:

HONG KONG= NW 4-5, SW UP TO 6 LATER. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA UP TO 2 M, UP TO 3 M LATER. SWELL NE 2-3 M. TEMP 26-29 C. =
KWANGTUNG= W TO SW 5-6, CYCLONIC UP TO 11 IN E. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 12 M IN E. SWELL E TO NE 3 M. =
TAIWAN STRAIT= E TO SE 5-6, UP TO 9 IN S. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 8 M IN S. SWELL NE 3 M. =
BASHI= S TO SW 5-6, 7 IN W. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 4 M IN W. SWELL S TO SW 3 M. =
PRATAS= S TO SW 6-7, UP TO 9 IN N. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 8 M IN N. SWELL NE 3 M. =
BALINTANG= S TO SW 5-6, 7 IN W. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 4 M IN W. SWELL S TO SW 3 M. =
SCARBOROUGH= SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S TO SW 2-3 M. =
PARACEL= SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL NE 2-3 M. =
TONKIN= SW 5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2 M. SWELL E TO NE 2 M. =
DANANG= SW 5. DOWN TO 2000 M IN SCT 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.


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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 23:30 HKT 02/Sep/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.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 11 p.m., Severe Tropical Storm Mawar with maximum sustained winds of about 90 kilometres per hour near its centre was located near 21.6 degrees north, 117.0 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 4 to 5, becoming southwest up to force 6.
    Squally showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao:
    Cyclonic force 10 to 11, becoming east to southeast force 11.
    Frequent heavy squally showers and thunderstorms.
    Very high to phenomenal seas.

    Shanwei:
    North to northwest force 10 to 11, becoming cyclonic force 11.
    Frequent heavy squally showers and thunderstorms.
    Very high to phenomenal seas.

    South of Hong Kong:
    West to southwest force 5 to 6.
    Heavy squally showers and thunderstorms.
    Moderate to rough seas.

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

    Outlook for the next 48 hours
    Southwesterly winds of force 5 to 6, up to force 9 in east at first. Frequent heavy squally showers and thunderstorms at first.

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

    Waglan Island Wind south-southeast force 3
      Visibility 10 Kilometres

    Shantou Wind northeast force 1
      Visibility 30 Kilometres

    Dongsha Wind west force 5
      Visibility 7 Kilometres in rain

    Macau Wind west-southwest force 3
      Visibility 17 Kilometres in showers

    Xisha Wind south-southwest force 2
      Visibility 19 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 02/SEP/2017
    (Next update at 01:30 HKT 03/SEP/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 :
     AT 5 P.M., SEVERE TROPICAL STORM MAWAR WAS
     CENTRED NEAR 21.5 DEGREES NORTH 117.0 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 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  270/10-15
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  260/15-20 OCNL 25 LATER              30-26
   B.   2000 FT:  350/10
                  BECMG 300/15 OCNL 20                 24
   C.   5000 FT:  360/15                               19
   D.  10000 FT:  010/25                               12
   E.  18000 FT:  050/20                               MS2
   F.  24000 FT:  040/15                               MS12
   G.  30000 FT:  090/20                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH SQUALLY SHOWERS AND THUNDERSTORMS.
      LOCALISED 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 3000 M IN SHOWERS/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     : 1.0-3.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     FRESH TO STRONG OCCASIONALLY SOUTHWESTERLY
     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 00:20 HKT on 03 Sep 17

    VHHK SIGMET 9 VALID 021325/021800 VHHH- VHHK HONG KONG FIR TC MAWAR PSN N2130 E11700 CB OBS AT 1200Z WI 240NM OF TC CENTRE TOP FL450 INTSF FCST AT 1800Z TC CENTRE PSN N2200 E11654= VHHK SIGMET 11 VALID 021620/022100 VHHH- VHHK HONG KONG FIR TC MAWAR PSN N2136 E11706 CB OBS AT 1500Z WI 240NM OF TC CENTRE TOP FL450 INTSF FCST AT 2100Z TC CENTRE PSN N2200 E11654=

    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 23:45 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 midnight, Severe Tropical Storm Mawar was estimated to be about 310 kilometres east-southeast of Hong Kong (near 21.7 degrees north 117.1 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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    Bulletin issued at 00:30 HKT 03/Sep/2017


    Tropical Cyclone Warning

    At 021500 UTC, Severe Tropical Storm Mawar (1716) with central pressure 984 hectopascals was centred within 60 nautical miles of two one point six degrees north (21.6 N) one one seven point one degrees east (117.1 E) and is forecast to move north-northwest slowly 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 over northern semicircle, 60 nautical miles elsewhere.
    Radius of over 47 knot winds 30 nautical miles.
    Radius of over 2 metre waves 120 nautical miles.

    Forecast position and intensity at 031500 UTC
    Two three point one degrees north (23.1 N)
    One one six point two degrees east (116.2 E)
    Maximum winds 55 knots.

    Forecast position and intensity at 041500 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 03/Sep/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     30.4 C
Minimum Air Temperature                     26.4 C
Grass Minimum Temperature                   25.9 C
Relative Humidity                        74 - 91 Percent
Rainfall                                     1.0 mm 
Total rainfall since 1st January          2256.4 mm
Against an average of                     1929.1 mm

Other Stations                Min                  Max
King's Park                  26.3 C               30.7 C
Wong Chuk Hang               24.5 C               31.0 C
Ta Kwu Ling                  24.7 C               32.0 C
Lau Fau Shan                 24.5 C               31.8 C
Tai Po                       25.1 C               31.0 C
Sha Tin                      25.3 C               32.3 C
Tuen Mun                     25.0 C               31.6 C
Tseung Kwan O                24.5 C               31.3 C
Sai Kung                     25.5 C               31.6 C
Cheung Chau                  24.8 C               31.7 C
Chek Lap Kok                 25.6 C               32.9 C
Tsing Yi                     25.3 C               31.5 C
Shek Kong                    25.2 C               32.5 C
Tsuen Wan Ho Koon            24.6 C               30.7 C
Tsuen Wan Shing Mun Valley   24.2 C               31.7 C
Hong Kong Park               24.4 C               31.3 C
Shau Kei Wan                 25.0 C               32.4 C
Kowloon City                 25.9 C               31.6 C
Happy Valley                 25.3 C               32.4 C
Wong Tai Sin                 24.5 C               31.9 C
Stanley                      25.2 C               30.5 C
Kwun Tong                    26.0 C               31.7 C
Sham Shui Po                 25.9 C               32.1 C
Kai Tak Runway Park          25.8 C               31.1 C
Yuen Long Park               25.6 C               32.5 C
Tai Mei Tuk               25.3 C               32.2 C

Duration of sunshine (King's Park):              1.1 H
The mean UV index recorded at King's Park yesterday was 3,
the UV intensity was Moderate.
The maximum UV index for yesterday was 6.
Sea surface temperature (Waglan Island):        27.3 C 

Yesterday's (02 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 02 Sep
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