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Bulletin issued at 21:02 HKT 08/Oct/2016

At 9 p.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 70 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 27 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 27 degrees;
Sai Kung 27 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 29 degrees;
Tsing Yi 28 degrees;
Shek Kong 27 degrees;
Tsuen Wan Ho Koon 26 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 28 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 27 degrees;
Happy Valley 28 degrees;
Wong Tai Sin 27 degrees;
Stanley 28 degrees;
Kwun Tong 27 degrees;
Sham Shui Po 28 degrees;
Kai Tak Runway Park 28 degrees;
Yuen Long Park 28 degrees.

Here is the information on Tropical Storm Aere:
Location: 21.8 degrees north, 117.0 degrees east; Maximum sustained wind near its centre: 75 km/h.


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


Climatological Information for 8 Oct

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


Local Weather Forecast
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Bulletin updated at 20:45 HKT 08/Oct/2016

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

Weather forecast for tonight and tomorrow

Mainly cloudy with a few showers. Cooler tomorrow with a minimum temperature of around 24 degrees. Bright periods during the day. The maximum temperature will be about 28 degrees. Moderate to fresh northerly winds, occasionally strong on high ground.

Outlook : Still windy with a few rain patches in the following couple of days. Cooler in the morning.


(The above forecast period is valid up to 23:59 HKT tomorrow, 09/10/2016; 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 08/Oct/2016

GALE WARNING AREAS: KWANGTUNG, TAIWAN STRAIT AND PRATAS.

GENERAL SITUATION AT 080900 UTC:
FOR DETAILS ON TROPICAL STORM AERE (1619), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 081300 UTC:

HONG KONG= N 4-5, OCNL 6. A FEW SHOWERS AND TS. SEA 2 M. TEMP 24-28 C. =
KWANGTUNG= N TO NE 6-7, 8 IN E. DOWN TO 500 M IN FRQ SQUALLY SHOWERS AND TS IN E. SEA 3-4 M, 6 M IN E. SWELL NE 2-3 M. =
TAIWAN STRAIT= NE 7-8. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 4-6 M. =
BASHI= S TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S TO SW 2 M. =
PRATAS= CYCLONIC 7-8. DOWN TO 500 M IN FRQ SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 3 M. =
BALINTANG= S TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S TO SW 2 M. =
SCARBOROUGH= S TO SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2 M. =
PARACEL= N TO NE 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2 M. SWELL NE 2 M. =
TONKIN= NE 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
DANANG= N TO NE 4-5. ISOL 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.


  • Map showing the 10 forecast areas
  • Tidal Information

    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 20:45 HKT 08/Oct/2016

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 8:45 p.m. on 08 October 2016

    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:
    A replenishment of the northeast monsoon will affect the south China coastal waters later.

    At 9 p.m., Tropical Storm Aere with maximum sustained winds of about 75 kilometres per hour near its centre was located at 21.8 degrees north, 117.0 degrees east. It is forecast to move northeast slowly and linger over the northern part of the South China Sea.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North force 4 to 5, occasionally force 6.
    A few showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao:
    Cyclonic force 7 to 8.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Shanwei:
    North to northeast force 7 to 8.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    South of Hong Kong:
    North to northeast force 6 to 7.
    Scattered squally showers and thunderstorms.
    Rough seas.

    Shangchuan Dao:
    North to northeast force 5 to 6.
    Isolated showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    Northeasterly winds of force 7 to 8, cyclonic winds of up to force 8 in east. Squally showers and thunderstorms.

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

    Waglan Island Wind north force 6
      Visibility 27 Kilometres

    Shantou Wind east-northeast force 1
      Visibility 30 Kilometres

    Dongsha Wind west-northwest force 7
      Visibility 10 Kilometres

    Huangmaozhou Wind north-northwest force 5

    Macau Wind north force 3
      Visibility 21 Kilometres

    Xisha Wind north-northwest force 1
      Visibility 30 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
  • Descriptive Terms of Wind Speeds
  • Visibility Readings in Hong Kong Waters
  • Map showing forecast areas
  • Tidal Information

    • WEATHER FORECAST FOR LOCAL AVIATION
    Traditional Chinese Simplified Chinese

    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 08/OCT/2016
    (Next update at 01:30 HKT 09/OCT/2016)
    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 4 P.M., TROPICAL STORM AERE WAS CENTRED NEAR
     21.6 DEGREES NORTH 116.7 DEGREES EAST AND IS
     FORECAST TO MOVE NORTHEAST SLOWLY AND LINGER
     OVER THE NORTHERN PART OF THE SOUTH CHINA SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  360/10-15
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  360/15-20, OCNL 25                   29-27
   B.   2000 FT:  360/20-25, OCNL 30                   20
   C.   5000 FT:  060/20, OCNL 25                      19
   D.  10000 FT:  040/10-15                            11
   E.  18000 FT:  030/10                               MS4
   F.  24000 FT:  300/10-15                            MS14
   G.  30000 FT:  250/10-15                            MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SQUALLY SHOWERS AND
      ISOLATED THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT SCT 4500 FT. TEMPO FEW CB 1000 FT
      SCT 2500 FT BKN 4000 FT
   K. VISIBILITY    : 8 KM. TEMPO 4000 M IN SHOWERS. TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 10800 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTH TO NORTHEASTERLY WINDS,
     OCCASIONALLY STRONG OFFSHORE AND ON HIGH
     GROUNDS. MAINLY CLOUDY WITH A FEW SQUALLY
     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.

    sigmet
    Traditional Chinese Simplified Chinese

    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 08 Oct 16

    VHHK SIGMET 9 VALID 081330/081800 VHHH- VHHK HONG KONG FIR TC AERE OBS AT 1200Z N2148 E11700 CB TOP FL480 WI 120NM OF CENTRE MOV NE 02KT NC FCST 1800Z TC CENTRE N2154 E11706=

    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 20:45 HKT 08/Oct/2016

    Tropical Cyclone Bulletin

    Here is the latest Tropical Cyclone 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 9 p.m., Tropical Storm Aere was estimated to be about 300 kilometres east of Hong Kong (near 21.8 degrees north 117.0 degrees east) and is forecast to move northeast slowly and linger over the northern part of the South China Sea.

    Aere showed sign of weakening. During the past few hours, its distance from Hong Kong was increasing gradually.

    A replenishment of the northeast monsoon is expected to reach the coastal areas of Guangdong tonight, bringing relatively cooler weather to Hong Kong. The Observatory will monitor the movement and intensity changes of Aere to consider the need of keeping the Standby Signal, No. 1.

    In the past hour, the maximum sustained winds recorded at Tate's Cairn were 55 kilometres per hour.

    (Precautionary Announcements with No. 1 Signal)

    1. Since there may be swells, you are advised to stay away from the shoreline and not to engage in water sports.

    2. Listen to radio, watch TV or browse the Hong Kong Observatory's web site for information on the tropical cyclone.
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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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    Severe Weather Information Centre

    Bulletin issued at 21:30 HKT 08/Oct/2016


    Tropical Cyclone Warning

    At 081200 UTC, Tropical Storm Aere (1619) with central pressure 990 hectopascals was centred within 90 nautical miles of two one point eight degrees north (21.8 N) one one seven point zero degrees east (117.0 E) and is forecast to move east slowly for the next 24 hours.

    Maximum winds near the centre are estimated to be 40 knots.

    Radius of over 33 knot winds 45 nautical miles.
    Radius of over 2 metre waves 120 nautical miles over northern semicircle, 90 nautical miles elsewhere.

    Forecast position and intensity at 091200 UTC
    Two one point three degrees north (21.3 N)
    One one seven point three degrees east (117.3 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 101200 UTC
    Two zero point four degrees north (20.4 N)
    One one five point eight degrees east (115.8 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 111200 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 08/Oct/2016 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     29.3 C
Minimum Air Temperature                     25.5 C
Grass Minimum Temperature                   25.1 C
Relative Humidity                        68 - 97 Percent
Rainfall                                    17.3 mm 
Total rainfall since 1st January          2394.2 mm
Against an average of                     2269.3 mm

Other Stations                Min                  Max
King's Park                  25.1 C               29.6 C
Wong Chuk Hang               24.5 C               30.0 C
Ta Kwu Ling                  24.1 C               30.4 C
Lau Fau Shan                 25.3 C               30.8 C
Tai Po                       24.6 C               28.9 C
Sha Tin                      24.9 C               30.4 C
Tuen Mun                     24.8 C               31.1 C
Tseung Kwan O                23.8 C               29.7 C
Sai Kung                     25.7 C               29.6 C
Cheung Chau                  24.8 C               28.9 C
Chek Lap Kok                 26.3 C               31.9 C
Tsing Yi                     24.3 C               30.4 C
Shek Kong                    24.6 C               30.6 C
Tsuen Wan Ho Koon            23.8 C               28.5 C
Tsuen Wan Shing Mun Valley   24.1 C               30.5 C
Hong Kong Park               24.5 C               30.3 C
Shau Kei Wan                 25.1 C               30.8 C
Kowloon City                 24.9 C               30.0 C
Happy Valley                 24.8 C               31.6 C
Wong Tai Sin                 25.2 C               30.5 C
Stanley                      25.4 C               30.9 C
Kwun Tong                    25.1 C               30.2 C
Sham Shui Po                 25.3 C               30.4 C
Kai Tak Runway Park          25.7 C               30.6 C
Yuen Long Park               24.9 C               31.6 C

Duration of sunshine (King's Park):              3.8 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.
 

Yesterday's (07 Oct 2016) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 to
0.15 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                               0.09
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.13
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.09
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.15

Note

      

    1. From readings taken at various locations in Hong Kong during
the period 1987-2015, 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 07 Oct
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