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Bulletin issued at 23:02 HKT 09/Oct/2016

At 11 p.m. at the Hong Kong Observatory the air temperature was 25 degrees Celsius and the relative humidity 71 per cent.

The air temperatures at other places were:

King's Park 24 degrees;
Wong Chuk Hang 25 degrees;
Ta Kwu Ling 24 degrees;
Lau Fau Shan 24 degrees;
Tai Po 24 degrees;
Sha Tin 24 degrees;
Tuen Mun 25 degrees;
Tseung Kwan O 24 degrees;
Sai Kung 24 degrees;
Cheung Chau 24 degrees;
Chek Lap Kok 25 degrees;
Tsing Yi 25 degrees;
Shek Kong 24 degrees;
Tsuen Wan Ho Koon 23 degrees;
Tsuen Wan Shing Mun Valley 24 degrees;
Hong Kong Park 25 degrees;
Shau Kei Wan 24 degrees;
Kowloon City 24 degrees;
Happy Valley 25 degrees;
Wong Tai Sin 24 degrees;
Stanley 25 degrees;
Kwun Tong 24 degrees;
Sham Shui Po 25 degrees;
Kai Tak Runway Park 25 degrees;
Yuen Long Park 24 degrees.

Here is the information on Tropical Storm Aere at 11 p.m.:
Location: 21.7 degrees north, 117.7 degrees east.


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


Climatological Information for 9 Oct

Regional Weather in Hong Kong

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Hong Kong Climatology


Local Weather Forecast
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Bulletin updated at 23:15 HKT 09/Oct/2016

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

The northeast monsoon affected southern China today. Locally, it was mainly cloudy with one or two rain patches. There were sunny intervals during the day. The weather was cooler. Temperatures over many places were two to three degrees lower than those of yesterday. The northeast monsoon is expected to bring relatively cool weather to southern China in the next couple of days. Under the combined effect of the northeast monsoon and Tropical Cyclone Aere, it will be windier with a few rain patches over the south China coastal areas.

At 11 p.m., Tropical Storm Aere was centred about 150 kilometres northeast of Dongsha. It is forecast to be slow-moving and linger over the northern part of the South China Sea.

Weather forecast for Hong Kong (Monday, 10 Oct 2016)

Mainly cloudy with one or two rain patches in the morning and at night. Cooler in the morning with a minimum temperature of around 24 degrees. Sunny intervals during the day with a maximum temperature of about 28 degrees. Moderate to fresh northerly winds, occasionally strong on high ground.

Outlook : 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, 10/10/2016; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

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MARINE FORECAST
Traditional Chinese Simplified Chinese

Marine Forecast

Weather Information for the Marine Community

Bulletin issued at 21:00 HKT 09/Oct/2016

GALE WARNING AREAS: KWANGTUNG, TAIWAN STRAIT, BASHI AND PRATAS.

GENERAL SITUATION AT 090900 UTC:
FOR DETAILS ON TROPICAL STORM AERE (1619), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 091300 UTC:

HONG KONG= N 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL E UP TO 2 M. TEMP 24-28 C. =
KWANGTUNG= N TO NE 6-7, UP TO 8 IN E. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS IN E. SEA 3-4 M, UP TO 6 M IN E. SWELL NE 2-3 M. =
TAIWAN STRAIT= NE 8, OCNL 9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 8 M. SWELL NE 3 M, SW 2 M. =
BASHI= S TO SE 6-7, OCNL 8 IN W. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M IN W. SWELL S TO SW 2 M. =
PRATAS= CYCLONIC 7-8. DOWN TO 500 M IN FRQ HEAVY 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, UP TO 3 M IN N. =
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. SWELL NE UP TO 2 M LATER. =
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

    Current Weather | Local Weather Forecast | Regional Temperature Forecast in HK
    9-day Weather Forecast | UV Index Forecast | Weather Information for Fishermen

    Bulletin issued at 23:30 HKT 09/Oct/2016

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 09 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:
    The northeast monsoon is affecting the south China coastal waters.

    At 11 p.m., Tropical Storm Aere with maximum sustained winds of about 65 kilometres per hour near its centre was located at 21.7 degrees north, 117.7 degrees east. It is forecast to be slow-moving 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.
    Isolated 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.
    Occasional heavy squally showers and thunderstorms.
    Rough to very rough seas.

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

    Shangchuan Dao:
    North to northeast force 5 to 6.
    Moderate to rough seas.

    Outlook for the next 48 hours
    Northeasterly winds of force 6 to 7, cyclonic winds of up to force 8 in east at first. Squally showers and thunderstorms.

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

    Waglan Island Wind north-northeast force 5
      Visibility 10 Kilometres

    Shantou Wind east force 1
      Visibility 30 Kilometres in showers

    Dongsha Wind north force 4
      Visibility 9 Kilometres in drizzle

    Huangmaozhou Wind north force 4

    Macau Wind north force 4
      Visibility 9 Kilometres

    Xisha Wind east-northeast force 2
      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 09/OCT/2016
    (Next update at 01:30 HKT 10/OCT/2016)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE NORTHEAST MONSOON IS AFFECTING SOUTHERN
     CHINA.  AT 4 P.M., TROPICAL STORM AERE WAS
     CENTRED NEAR 21.7 DEGREES NORTH, 117.6 DEGREES
     EAST.  IT IS FORECAST TO BE SLOW-MOVING 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:  010/10-15
       OFFSHORE:  010/15-20, OCNL 25                   28-26
   B.   2000 FT:  020/20-25, OCNL 30                   19
   C.   5000 FT:  020/20-25, OCNL 30 IN E              17
   D.  10000 FT:  040/10-15                            9
   E.  18000 FT:  040/10                               MS4
   F.  24000 FT:  270/10                               MS13
   G.  30000 FT:  250/15                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      MAINLY CLOUDY WITH ONE OR TWO RAIN PATCHES.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT SCT 4000 FT
   K. VISIBILITY    : 10 KM. TEMPO 4000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 10000 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTH TO NORTHEASTERLY WINDS,
     OCCASIONALLY STRONG OFFSHORE AND ON HIGH GROUND.
     MAINLY CLOUDY WITH A FEW RAIN PATCHES.=

    ===================================================================
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 22:43 HKT on 09 Oct 16

    VHHK SIGMET 12 VALID 091445/091845 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2330 E11648 - N2342 E11730 - N2124 E11730 - N2136 E11606 - N2248 E11612 - N2330 E11648 TOP FL480 STNR NC= VHHK SIGMET 10 VALID 091800/100000 VHHH- VHHK HONG KONG FIR TC AERE FCST AT 1800Z N2124 E11730 CB TOP FL480 WI 120NM OF CENTRE MOV SW 02KT NC FCST 0000Z TC CENTRE N2112 E11706=

    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.

    The latest report on Tropical Cyclone Aere broadcast by Dr LEE TSZ CHEUNG , Senior Scientific Officer of the Hong Kong Observatory at 6:18 p.m. on 08 Oct 2016.
    Listen Listen

    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
    Current Weather |  Local Weather Forecast |  9-day Weather Forecast
    South China Coastal Waters |  Marine Forecast
    Severe Weather Information Centre

    Bulletin issued at 21:30 HKT 09/Oct/2016


    Tropical Cyclone Warning

    At 091200 UTC, Tropical Storm Aere (1619) with central pressure 994 hectopascals was centred within 90 nautical miles of two one point six degrees north (21.6 N) one one seven point seven degrees east (117.7 E) and is forecast to be slow moving for the next 24 hours.

    Maximum winds near the centre are estimated to be 35 knots.

    Radius of over 33 knot winds 30 nautical miles.
    Radius of over 2 metre waves 120 nautical miles over northern semicircle, 90 nautical miles elsewhere.

    Forecast position and intensity at 101200 UTC
    Two zero point six degrees north (20.6 N)
    One one six point zero degrees east (116.0 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 09/Oct/2016 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     29.9 C
Minimum Air Temperature                     27.0 C
Grass Minimum Temperature                   25.8 C
Relative Humidity                        69 - 76 Percent
Rainfall                                      Trace 
Total rainfall since 1st January          2394.2 mm
Against an average of                     2269.5 mm

Other Stations                Min                  Max
King's Park                  26.5 C               30.1 C
Wong Chuk Hang               26.6 C               29.9 C
Ta Kwu Ling                  26.3 C               29.1 C
Lau Fau Shan                 26.2 C               29.1 C
Tai Po                       26.4 C               28.6 C
Sha Tin                      26.8 C               29.6 C
Tuen Mun                     26.6 C               29.8 C
Tseung Kwan O                26.1 C               31.2 C
Sai Kung                     26.7 C               29.3 C
Cheung Chau                  25.9 C               29.7 C
Chek Lap Kok                 27.5 C               32.3 C
Tsing Yi                     27.2 C               30.3 C
Shek Kong                    25.9 C               31.2 C
Tsuen Wan Ho Koon            25.5 C               28.3 C
Tsuen Wan Shing Mun Valley   26.5 C               31.5 C
Hong Kong Park               27.0 C               30.7 C
Shau Kei Wan                 26.7 C               30.7 C
Kowloon City                 26.4 C               30.0 C
Happy Valley                 27.5 C               31.6 C
Wong Tai Sin                 26.8 C               30.9 C
Stanley                      27.1 C               30.9 C
Kwun Tong                    26.5 C               31.4 C
Sham Shui Po                 26.9 C               30.1 C
Kai Tak Runway Park          27.3 C               31.0 C
Yuen Long Park               26.8 C               31.2 C

Duration of sunshine (King's Park):              2.1 H
The mean UV index recorded at King's Park yesterday was 2,
the UV intensity was Low.
The maximum UV index for yesterday was 7.
 

Yesterday's (08 Oct 2016) 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                               0.09
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                        0.14

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 08 Oct
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