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Bulletin issued at 22:41 HKT 03/Sep/2017

At 10 p.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 91 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 3 was issued at 10:40 p.m.
The Thunderstorm Warning has been issued. It will remain effective until 11:45 p.m. today. Squally thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

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

Here is the information on Tropical Storm Mawar:
Location: 22.8 degrees north, 116.1 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 3 Sep

Regional Weather in Hong Kong

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Bulletin updated at 21:45 HKT 03/Sep/2017

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

Weather forecast for tonight and tomorrow

Cloudy. There will be heavy rain with squalls and thunderstorms. Rain will ease off later tomorrow. Temperatures will range between 25 and 30 degrees. Moderate to fresh west to southwesterly winds, strengthening overnight. Winds will moderate later tomorrow. Seas will be rough with swells at first.

Outlook : Sunny periods in the following few days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 04/09/2017; 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 03/Sep/2017

GALE WARNING AREAS: KWANGTUNG, TAIWAN STRAIT AND PRATAS.

GENERAL SITUATION AT 030900 UTC:
FOR DETAILS ON TROPICAL STORM MAWAR (1716), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 031300 UTC:

HONG KONG= W TO SW 5-6. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S TO SW 2 M. TEMP 25-30 C. =
KWANGTUNG= SW 6-7, CYCLONIC 9 IN E AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, 8 M IN E AT FIRST. SWELL S TO SW 3 M. =
TAIWAN STRAIT= S7, OCNL 8. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL S 2 M. =
BASHI= SW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S TO SW 3 M. =
PRATAS= SW 6-7, UP TO 8 IN N AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M IN N AT FIRST. SWELL S TO SW 3 M. =
BALINTANG= SW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S TO SW 3 M. =
SCARBOROUGH= SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SW 2 M. =
PARACEL= S TO SW 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S TO SW 2 M. =
TONKIN= S TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= S TO SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 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 20:15 HKT 03/Sep/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 8:15 p.m. on 03 September 2017

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

    Weather Situation:
    At 7 p.m., Tropical Storm Mawar with maximum sustained winds of about 85 kilometres per hour near its centre was located near 22.5 degrees north, 116.2 degrees east. It is forecast to move northwest or west-northwest at about 12 kilometres per hour in the general direction of the coast of eastern Guangdong.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    West to southwest force 5 to 6.
    Frequent heavy squally showers and thunderstorms.
    Rough seas.

    Nan'ao:
    Southwest force 6 to 7, up to force 8 at first.
    Frequent heavy squally showers and thunderstorms.
    High seas.

    Shanwei:
    Cyclonic force 9, becoming southwest force 7 to 8.
    Frequent heavy squally showers and thunderstorms.
    Very high seas.

    South of Hong Kong:
    Southwest force 6 to 7.
    Frequent heavy squally showers and thunderstorms.
    Rough seas.

    Shangchuan Dao:
    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. Isolated squally showers and thunderstorms.

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

    Waglan Island Wind west-southwest force 5
      Visibility 17 Kilometres

    Shantou Wind east force 3
      Visibility 1800 Metres in showers

    Dongsha Wind west-southwest force 4
      Visibility 10 Kilometres

    Macau Wind south-southwest force 2
      Visibility 11 Kilometres

    Xisha Wind south-southwest force 2
      Visibility 17 Kilometres

  • Explanation of Seas or Sea Waves
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 18:15 HKT 03/SEP/2017
    (Next update at 01:30 HKT 04/SEP/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS, SEV TURB AND SEV GUSTS.
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     SEVERE TROPICAL STORM MAWAR HAS WEAKENED INTO A
     TROPICAL STORM.
     AT 6 P.M., MAWAR WAS CENTRED NEAR 22.5 DEGREES
     NORTH 116.2 DEGREES EAST AND IS FORECAST TO MOVE
     NORTHWEST OR WEST-NORTHWEST AT ABOUT 6 KNOTS IN
     THE GENERAL DIRECTION OF THE COAST OF EASTERN
     GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1815 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  250/10-15 BEC 250/20-25
                  TEMPO VRB/25G35 IN TS
       OFFSHORE:  250/20-25                            31-25
   B.   2000 FT:  300/15-20 BEC 280/20-25, OCNL 30     23
   C.   5000 FT:  330/20                               19
   D.  10000 FT:  360/25                               12
   E.  18000 FT:  020/25                               MS2
   F.  24000 FT:  050/30                               MS10
   G.  30000 FT:  080/30                               MS23
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH HEAVY RAIN WITH SQUALLS AND
      THUNDERSTORMS.  LOCALIZED MIST AT FIRST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 FT  BKN 8000 FT.  TEMPO
      FEW CB 800 FT  SCT 1500 FT  BKN 4000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 3000 M IN RAIN/MIST.
                      TEMPO 1500 M IN TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11000 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 2.5-3.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     FRESH TO STRONG SOUTHWESTERLY WINDS.  CLOUDY
     WITH HEAVY RAIN WITH SQUALLS AND THUNDERSTORMS.
     RAIN WILL EASE OFF LATER.=

    ===================================================================
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 21:30 HKT on 03 Sep 17

    VHHK SIGMET 7 VALID 031030/031500 VHHH- VHHK HONG KONG FIR TC MAWAR PSN N2224 E11618 CB OBS AT 0900Z WI 240NM OF TC CENTRE TOP FL450 NC FCST AT 1500Z TC CENTRE PSN N2242 E11548= VHHK SIGMET 9 VALID 031330/031600 VHHH- VHHK HONG KONG FIR TC MAWAR PSN N2236 E11606 CB OBS AT 1200Z WI 210NM OF TC CENTRE TOP FL450 NC FCST AT 1600Z TC CENTRE PSN N2248 E11548=

    Please click here for more about the SIGMET

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    Tropical Cyclone Warnings

    Bulletin issued at 22:40 HKT 03/Sep/2017

    The No. 3 Strong Wind Signal has been issued at 10:40 p.m. to replace the No. 1 Standby Signal.
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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 21:30 HKT 03/Sep/2017


    Tropical Cyclone Warning

    At 031200 UTC, Tropical Storm Mawar (1716) with central pressure 988 hectopascals was centred within 60 nautical miles of two two point six degrees north (22.6 N) one one six point one degrees east (116.1 E) and is forecast to move northwest or west-northwest at about 6 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 90 nautical miles.

    Forecast position and intensity at 041200 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
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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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