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Bulletin issued at 12:41 HKT 07/Sep/2017

At noon at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 77 per cent.
During the past hour the mean UV Index recorded at King's Park was 4. The intensity of UV radiation was moderate.

Please be reminded that:

The Thunderstorm Warning was issued at 12:40 p.m. It will remain effective until 2:30 p.m. today. Isolated thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 30 degrees;
Wong Chuk Hang 30 degrees;
Ta Kwu Ling 26 degrees;
Sha Tin 29 degrees;
Tuen Mun 31 degrees;
Tseung Kwan O 31 degrees;
Sai Kung 30 degrees;
Cheung Chau 30 degrees;
Chek Lap Kok 31 degrees;
Tsing Yi 30 degrees;
Shek Kong 29 degrees;
Tsuen Wan Ho Koon 28 degrees;
Tsuen Wan Shing Mun Valley 29 degrees;
Hong Kong Park 30 degrees;
Shau Kei Wan 31 degrees;
Kowloon City 30 degrees;
Happy Valley 31 degrees;
Wong Tai Sin 31 degrees;
Stanley 29 degrees;
Kwun Tong 31 degrees;
Sham Shui Po 31 degrees;
Kai Tak Runway Park 30 degrees;
Yuen Long Park 30 degrees;
Tai Mei Tuk 30 degrees.

Between 10:45 and 11:45 a.m., the rainfall recorded in various regions were:

North District 0 to 29 mm;
Tai Po 0 to 8 mm;
Yuen Long 0 to 8 mm;
Sha Tin 0 to 4 mm;
Tsuen Wan 0 to 2 mm;
Kwai Tsing 0 to 2 mm.

No rainfall was recorded at the Hong Kong Observatory between midnight last night and midday today.

Here is the information on Tropical Depression Guchol at noon:
Location: 23.4 degrees north, 119.1 degrees east.


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


Climatological Information for 7 Sep

Regional Weather in Hong Kong

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Bulletin updated at 11:45 HKT 07/Sep/2017

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

A trough of low pressure is bringing showers to the northern part of the South China Sea and the coast of Guangdong.

At noon, Tropical Depression Guchol was centred about 150 kilometres northwest of Gaoxiong. It is forecast to move north at about 14 kilometres per hour across the Taiwan Strait and weaken gradually.

Weather forecast for this afternoon and tonight

Mainly cloudy with a few showers and isolated thunderstorms. Light to moderate southwesterly winds.

Outlook : Still a few showers in the next couple of days. Mainly fine 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 09:00 HKT 07/Sep/2017

N0 WARNING.

GENERAL SITUATION AT 062100 UTC:
FOR DETAILS ON TROPICAL DEPRESSION GUCHOL (1717), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 070100 UTC:

HONG KONG= SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. TEMP 31-27 C. =
KWANGTUNG= SW 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL SW UP TO 2 M. =
TAIWAN STRAIT= CYCLONIC 6, BEC SW 5-6. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SE 2-3 M. =
BASHI= SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL SW UP TO 2 M. =
PRATAS= SW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2 M. =
BALINTANG= SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL SW UP TO 2 M. =
SCARBOROUGH= SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL SW 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 SW UP TO 2 M. =
TONKIN= S 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= S TO SW 4-5. DOWN TO 2000 M IN SCT 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 12:30 HKT 07/Sep/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 p.m. on 07 September 2017

    Warnings:
    Strong winds in Nan'ao.

    Weather Situation:
    A trough of low pressure is affecting the south China coastal waters.

    At noon, Tropical Depression Guchol with maximum sustained winds of about 45 kilometres per hour near its centre was located at 23.4 degrees north, 119.1 degrees east. It is forecast to move north at about 14 kilometres per hour across the Taiwan Strait and weaken gradually.

    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.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

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

    Shangchuan Dao:
    South to southwest force 4 to 5.
    Scattered 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 southeast force 4
      Visibility 33 Kilometres

    Shantou Wind south-southwest force 2
      Visibility 10 Kilometres

    Dongsha Wind southwest force 2
      Visibility 10 Kilometres

    Macau Wind east-southeast force 2
      Visibility 30 Kilometres

    Xisha Wind west-southwest force 4
      Visibility 16 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 09:00 HKT 07/SEP/2017
    (Next update at 17:30 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 :
     AT 9 A.M., TROPICAL DEPRESSION GUCHOL WAS
     LOCATED AT 22.9 DEGREES NORTH, 119.1 DEGREES
     EAST. IT IS FORECAST TO MOVE NORTH AT ABOUT 8
     KNOTSR ACROSS THE TAIWAN STRAIT AND WEAKEN
     GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  210/5-10
                  TEMPO VRB/15G25 IN TS                28-32
   B.   2000 FT:  210/10-15                            22
   C.   5000 FT:  180/10                               20
   D.  10000 FT:  300/10                               12
   E.  18000 FT:  090/10                               MS3
   F.  24000 FT:  130/10                               MS12
   G.  30000 FT:  100/10                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      SUNNY INTERVALS AND A FEW SHOWERS. 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    : 8 KM.  TEMPO 4000 M IN SHOWERS.  TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 10600 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS.
   N. SEA STATE     : 1.0-1.5 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 10:20 HKT on 07 Sep 17

    VHHK SIGMET 1 VALID 070220/070520 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2012 E11230 - N2018 E11130 - N2124 E11130 - N2136 E11200 - N2148 E11318 - N2012 E11230 TOP FL380 MOV NW 05KT NC= VHHK SIGMET 7 VALID 062220/070220 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2012 E11130 - N2124 E11130 - N2148 E11212 - N2012 E11218 - N2012 E11130 TOP FL350 MOV W 05 KT NC=

    Please click here for more about the SIGMET

    Tropical Cyclone Warning
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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

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    Bulletin issued at 12:30 HKT 07/Sep/2017


    Tropical Cyclone Warning

    At 070300 UTC, Tropical Depression Guchol (1717) with central pressure 1000 hectopascals was centred within 60 nautical miles of two three point three degrees north (23.3 N) one one nine point one degrees east (119.1 E) and is forecast to move north at about 8 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 25 knots.

    Radius of over 2 metre waves 60 nautical miles.

    Forecast position and intensity at 080300 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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