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Bulletin issued at 00:02 HKT 07/Sep/2017

At midnight at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 84 per cent.

The air temperatures at other places were:

King's Park 28 degrees;
Wong Chuk Hang 28 degrees;
Ta Kwu Ling 27 degrees;
Lau Fau Shan 27 degrees;
Tai Po 27 degrees;
Sha Tin 29 degrees;
Tuen Mun 28 degrees;
Tseung Kwan O 27 degrees;
Sai Kung 27 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 30 degrees;
Tsing Yi 28 degrees;
Shek Kong 27 degrees;
Tsuen Wan Ho Koon 27 degrees;
Tsuen Wan Shing Mun Valley 28 degrees;
Hong Kong Park 28 degrees;
Shau Kei Wan 28 degrees;
Kowloon City 28 degrees;
Happy Valley 29 degrees;
Wong Tai Sin 28 degrees;
Stanley 28 degrees;
Kwun Tong 29 degrees;
Sham Shui Po 29 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 29 degrees;
Tai Mei Tuk 27 degrees.

Here is the information on Tropical Depression Guchol at 11:00 p.m. yesterday:
Location: 22.0 degrees north, 120.0 degrees east.


Note: The data above is provisional. Only limited data validation has been carried out.


Climatological Information for 7 Sep

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Bulletin updated at 00:00 HKT 07/Sep/2017

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

Showers affected the coast of Guangdong and the northern part of the South China Sea yesterday. Locally, it was mainly cloudy with a few showers. More than 10 millimetres of rainfall were recorded over Lantau Island and the northern part of the New Territories. It was hot with sunny periods during the day. The weather will still be relatively unsettled with showers over the northern part of the South China Sea today and tomorrow.

The area of low pressure over the Luzon Strait intensified into a tropical depression yesterday morning and was named Guchol. At 11 p.m. last night, Guchol was centred about 70 kilometres south-southwest of Gaoxiong. It is forecast to move north-northwest at about 14 kilometres per hour in the general direction of the Taiwan Strait and the coast of Fujian and will weaken gradually later.

Weather forecast for Hong Kong (Thursday, 7 Sep 2017)

Mainly cloudy with a few showers and isolated thunderstorms. Temperatures will range between 27 and 31 degrees. Light to moderate southwesterly winds.

Outlook : Still a few showers on Friday. Mainly fine during the weekend and early next week.


(The above forecast period is valid up to 23:59 HKT today, 07/09/2017; 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 06/Sep/2017

N0 WARNING.

GENERAL SITUATION AT 060900 UTC:
FOR DETAILS ON TROPICAL DEPRESSION GUCHOL (1717), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 061300 UTC:

HONG KONG= SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. TEMP 27-31 C. =
KWANGTUNG= SW 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL SE UP TO 2 M. =
TAIWAN STRAIT= SE 6, BEC CYCLONIC 6, OCNL 7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL SE 2-3 M. =
BASHI= CYCLONIC 6, OCNL 7, BEC SW 6. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 3 M. =
PRATAS= SW 5-6, OCNL 7. DOWN TO 1000 M IN SQUALLY HEAVY SHOWERS AND TS. SEA UP TO 4 M. SWELL E TO NE 2-3 M. =
BALINTANG= SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL NE 3 M. =
SCARBOROUGH= W TO SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL NE UP TO 2 M. =
PARACEL= S TO SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL E UP TO 2 M. =
TONKIN= S 4-5. DOWN TO 4000 M IN ISOL SQUALLY 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 23:30 HKT 06/Sep/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 06 September 2017

    Warnings:
    Strong winds in Nan'ao and Shanwei.

    Weather Situation:
    At 11 p.m., Tropical Depression Guchol with maximum sustained winds of about 55 kilometres per hour near its centre was located at 22.0 degrees north, 120.0 degrees east. It is forecast to move north-northwest at about 14 kilometres per hour in the general direction of the Taiwan Strait and the coast of Fujian and will weaken gradually later.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Southwest force 4 to 5.
    Isolated squally showers and thunderstorms.
    Moderate seas.

    Nan'ao:
    West to northwest force 5 to 6.
    Heavy squally showers and thunderstorms.
    Rough seas.

    Shanwei:
    West to southwest force 5, occasionally force 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    South of Hong Kong and Shangchuan Dao:
    Southwest force 4 to 5.
    Isolated squally showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    South to southwesterly winds of force 4 to 5. Isolated squally showers and thunderstorms.

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

    Waglan Island Wind southwest force 2
      Visibility 22 Kilometres

    Shantou Wind southeast force 2
      Visibility 28 Kilometres

    Macau Wind south-southwest force 1
      Visibility 45 Kilometres

    Xisha Wind south-southwest force 3
      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 17:30 HKT 06/SEP/2017
    (Next update at 01:30 HKT 07/SEP/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     SHOWERS ARE AFFECTING THE COAST OF GUANGDONG AND
     THE NORTHERN PART OF THE SOUTH CHINA SEA.
     AT 4 P.M., TROPICAL DEPRESSION GUCHOL WAS
     CENTRED NEAR 21.0 DEGREES NORTH, 120.1 DEGREES
     EAST.  IT IS FORECAST TO MOVE NORTH-NORTHWEST AT
     ABOUT 8 KNOTS IN THE GENERAL DIRECTION OF TAIWAN
     STRAIT AND THE COAST OF FUJIAN AND WILL WEAKEN
     GRADUALLY LATER.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  210/5-10
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  210/10-15                            31-27
   B.   2000 FT:  210/10-15                            24
   C.   5000 FT:  060/10                               21
   D.  10000 FT:  060/10                               12
   E.  18000 FT:  110/20                               MS1
   F.  24000 FT:  110/25                               MS11
   G.  30000 FT:  130/25                               MS24
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS AND ISOLATED
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 FT.  TEMPO FEW CB 1000 FT
      SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 9 KM.  TEMPO 4000 M IN SHOWERS.
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS.
   N. SEA STATE     : 1.5 M         SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT TO MODERATE SOUTHWESTERLY WINDS.  MAINLY
     CLOUDY WITH A FEW SHOWERS AND ISOLATED
     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 21:03 HKT on 06 Sep 17

    VHHK SIGMET 3 VALID 060905/061305 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1954 E11636 - N1842 E11442 - N1800 E11300 - N1930 E11130 - N2048 E11318 - N2100 E11730 - N1954 E11636 TOP FL420 MOV W 05KT WKN= VHHK SIGMET 5 VALID 061305/061705 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1900 E11554 - N1900 E11500 - N2206 E11500 - N2306 E11730 - N2100 E11730 TOP FL420 MOV NW 10KT WKN=

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    Tropical Cyclone Warning

    There is no tropical cyclone warning signal.

    For other tropical cyclone related information, please visit the World Meteorological Organization Web Site - Severe Weather Information Centre.

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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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    Bulletin issued at 00:30 HKT 07/Sep/2017


    Tropical Cyclone Warning

    At 061500 UTC, Tropical Depression Guchol (1717) with central pressure 998 hectopascals was centred within 60 nautical miles of two one point nine degrees north (21.9 N) one one nine point seven degrees east (119.7 E) and is forecast to move north-northwest at about 8 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 30 knots.

    Radius of over 2 metre waves 60 nautical miles.

    Forecast position and intensity at 071500 UTC
    Dissipated over sea.



    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 07/Sep/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     32.3 C
Minimum Air Temperature                     27.3 C
Grass Minimum Temperature                   26.6 C
Relative Humidity                        65 - 94 Percent
Rainfall                                      Trace 
Total rainfall since 1st January          2319.4 mm
Against an average of                     1971.8 mm

Other Stations                Min                  Max
King's Park                  27.1 C               32.4 C
Wong Chuk Hang               27.1 C               32.1 C
Ta Kwu Ling                  25.8 C               33.0 C
Tai Po                       26.2 C               31.5 C
Sha Tin                      26.3 C               32.6 C
Tuen Mun                     26.6 C               32.3 C
Tseung Kwan O                26.3 C               32.6 C
Sai Kung                     26.4 C               31.0 C
Cheung Chau                  26.4 C               32.9 C
Chek Lap Kok                 27.5 C               33.5 C
Tsing Yi                     26.5 C               32.4 C
Shek Kong                    25.9 C               33.5 C
Tsuen Wan Ho Koon            26.1 C               30.9 C
Tsuen Wan Shing Mun Valley   26.3 C               32.9 C
Hong Kong Park               26.8 C               32.5 C
Shau Kei Wan                 26.6 C               34.0 C
Kowloon City                 27.0 C               32.7 C
Happy Valley                 27.3 C               33.5 C
Wong Tai Sin                 26.5 C               32.7 C
Stanley                      26.9 C               31.6 C
Kwun Tong                    27.3 C               32.8 C
Sham Shui Po                 27.2 C               33.0 C
Kai Tak Runway Park          27.1 C               32.9 C
Yuen Long Park               27.1 C               34.7 C
Tai Mei Tuk               26.5 C               32.3 C

Duration of sunshine (King's Park):              7.2 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 10.
Sea surface temperature (Waglan Island):        27.6 C 

Yesterday's (06 Sep 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.07 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                           0.07
Tap Mun                             0.08
Kat O                               0.08
Yuen Ng Fan                         0.11
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                      0.12
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 06 Sep
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