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Bulletin issued at 11:02 HKT 07/Oct/2016

At 11 a.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 78 per cent.
During the past hour the mean UV Index recorded at King's Park was 3. The intensity of UV radiation was moderate.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.

The air temperatures at other places were:

King's Park 29 degrees;
Wong Chuk Hang 29 degrees;
Ta Kwu Ling 30 degrees;
Lau Fau Shan 29 degrees;
Tai Po 28 degrees;
Sha Tin 29 degrees;
Tuen Mun 29 degrees;
Tseung Kwan O 29 degrees;
Sai Kung 29 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 30 degrees;
Tsing Yi 30 degrees;
Shek Kong 30 degrees;
Tsuen Wan Ho Koon 28 degrees;
Tsuen Wan Shing Mun Valley 30 degrees;
Hong Kong Park 28 degrees;
Shau Kei Wan 29 degrees;
Kowloon City 29 degrees;
Happy Valley 30 degrees;
Wong Tai Sin 29 degrees;
Stanley 30 degrees;
Kwun Tong 29 degrees;
Sham Shui Po 30 degrees;
Kai Tak Runway Park 30 degrees;
Yuen Long Park 31 degrees.

Here is the information on Tropical Storm Aere:
Location: 20.6 degrees north, 116.3 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 7 Oct

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


Local Weather Forecast
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Bulletin updated at 10:45 HKT 07/Oct/2016

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

Weather forecast for today

Sunny periods. Moderate to fresh northerly winds. A few squally showers later with occasionally strong winds offshore and on high ground.

Outlook : Windier with squally showers over the weekend and Chung Yeung Festival holiday.


(The above forecast period is valid up to 23:59 HKT today, 07/10/2016; 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 09:00 HKT 07/Oct/2016

GALE WARNING AREAS: KWANGTUNG AND PRATAS.

GENERAL SITUATION AT 062100 UTC:
FOR DETAILS ON TROPICAL STORM AERE (1619), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 070100 UTC:

HONG KONG= N TO NE 4-5, OCNL 6. ISOL SHOWERS. SEA 2-3 M. TEMP 30-25 C. =
KWANGTUNG= NE 5-6, 7-8 IN E. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS IN E. SEA 3-4 M, UP TO 8 M IN E. =
TAIWAN STRAIT= E TO SE 6-7. DOWN TO 2000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. =
BASHI= SE 6-7. DOWN TO 1000 M IN SCT SHOWERS AND TS. SEA UP TO 5 M. SWELL W 2 M. =
PRATAS= CYCLONIC 8-9. DOWN TO 500 M IN FRQ SQUALLY SHOWERS AND TS. SEA UP TO 8 M. SWELL NE 2-3 M. =
BALINTANG= S TO SE 6-7. DOWN TO 1000 M IN SCT SHOWERS AND TS. SEA UP TO 5 M. SWELL W 2 M. =
SCARBOROUGH= S TO SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. =
PARACEL= N TO NE 4-5, 6-7 IN E. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 5 M. =
TONKIN= NE 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
DANANG= NE 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.


  • Map showing the 10 forecast areas
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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 10:15 HKT 07/Oct/2016

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 10:15 a.m. on 07 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:
    At 10 a.m., Tropical Storm Aere with maximum sustained winds of about 75 kilometres per hour near its centre was located at 20.6 degrees north, 116.3 degrees east. It is forecast to move west slowly, lingering over the northern part of the South China Sea and intensify gradually.

    Area forecasts for the next 24 hours

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

    Nan'ao:
    East to northeast force 7 to 8, up to force 9 in south.
    Scattered heavy squally showers and thunderstorms.
    Very rough seas.

    Shanwei:
    Northeast force 7 to 8, up to force 9 in south.
    Scattered heavy squally showers and thunderstorms.
    Very rough seas.

    South of Hong Kong:
    North to northeast force 5 to 6, force 6 to 7 in east.
    Isolated 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 9 to 10. Scattered heavy squally showers and thunderstorms.

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

    Waglan Island Wind north force 4
      Visibility 11 Kilometres

    Shantou Wind calm
      Visibility 23 Kilometres in showers

    Dongsha Wind southeast force 4
      Visibility 7 Kilometres in rain

    Huangmaozhou Wind north force 3

    Macau Wind north force 3
      Visibility 6 Kilometres

    Xisha Wind north force 2
      Visibility 25 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 09:30 HKT 07/OCT/2016
    (Next update at 17:30 HKT 07/OCT/2016)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 8 A.M., TROPICAL STORM AERE WAS CENTRED AT
     20.6 DEGREES NORTH, 116.5 DEGREES EAST. IT IS
     FORECAST TO MOVE WEST AT ABOUT 4 KNOTS ACROSS
     THE NORTHERN PART OF THE SOUTH CHINA SEA AND
     INTENSIFY GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  350/10
                  TEMPO 100/15G25 IN TS
       OFFSHORE:  360/15-20                            29-32
   B.   2000 FT:  040/15-20, OCNL 25                   23
   C.   5000 FT:  040/15-20, OCNL 25                   18
   D.  10000 FT:  050/15-20                            10
   E.  18000 FT:  070/10-15                            MS3
   F.  24000 FT:  070/5-10                             MS13
   G.  30000 FT:  080/5-10                             MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      SUNNY INTERVALS. THERE WILL BE A FEW SHOWERS
      AND SQUALLY THUNDERSTORMS LATER.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT SCT 3500 FT TEMPO FEW CB 1000 FT
      SCT 2500 FT BKN 4000 FT
   K. VISIBILITY    : 10 KM. TEMPO 4000 M IN SHOWERS. TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 10500 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS AND HILLS. MOD OFFSHORE.
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTHERLY WINDS. MAINLY CLOUDY
     WITH OCCASIONAL SHOWERS AND SQUALLY
     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
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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 09:35 HKT on 07 Oct 16

    VHHK SIGMET 1 VALID 070135/070600 VHHH- VHHK HONG KONG FIR TC AERE OBS AT 0000Z N2036 E11630 CB TOP FL450 WI 120NM OF CENTRE MOV W 04KT INTSF FCST 0600Z TC CENTRE N2036 E11618=

    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 10:45 HKT 07/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 11 a.m., Tropical Storm Aere was estimated to be about 290 kilometres southeast of Hong Kong (near 20.6 degrees north 116.3 degrees east). It is forecast to move west slowly, linger over the northern part of the South China Sea and intensify gradually.
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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 09:30 HKT 07/Oct/2016


    Tropical Cyclone Warning

    At 070000 UTC, Tropical Storm Aere (1619) with central pressure 990 hectopascals was centred within 60 nautical miles of two zero point six degrees north (20.6 N) one one six point five degrees east (116.5 E) and is forecast to be slow moving for the next 24 hours.

    Maximum winds near the centre are estimated to be 40 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 080000 UTC
    Two zero point seven degrees north (20.7 N)
    One one six point one degrees east (116.1 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 090000 UTC
    Two one point one degrees north (21.1 N)
    One one six point two degrees east (116.2 E)
    Maximum winds 60 knots.

    Forecast position and intensity at 100000 UTC
    Two zero point nine degrees north (20.9 N)
    One one five point six degrees east (115.6 E)
    Maximum winds 55 knots.

    Forecast position and intensity at 110000 UTC
    Two zero point five degrees north (20.5 N)
    One one three point five degrees east (113.5 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 120000 UTC
    Two zero point three degrees north (20.3 N)
    One one zero point three degrees east (110.3 E)
    Maximum winds 30 knots.



    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/Oct/2016 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     32.4 C
Minimum Air Temperature                     25.9 C
Grass Minimum Temperature                   25.1 C
Relative Humidity                        58 - 95 Percent
Rainfall                                    16.7 mm 
Total rainfall since 1st January          2376.9 mm
Against an average of                     2268.3 mm

Other Stations                Min                  Max
King's Park                  25.1 C               32.3 C
Wong Chuk Hang               24.7 C               32.2 C
Ta Kwu Ling                  24.0 C               33.2 C
Lau Fau Shan                 24.4 C               31.1 C
Tai Po                       24.6 C               30.8 C
Sha Tin                      25.7 C               32.3 C
Tuen Mun                     25.3 C               32.7 C
Tseung Kwan O                24.6 C               33.9 C
Sai Kung                     25.8 C               31.4 C
Cheung Chau                  24.1 C               33.3 C
Chek Lap Kok                 26.7 C               32.5 C
Tsing Yi                     26.1 C               33.7 C
Shek Kong                    24.9 C               33.6 C
Tsuen Wan Ho Koon            24.6 C               30.6 C
Tsuen Wan Shing Mun Valley   25.0 C               33.1 C
Hong Kong Park               24.8 C               32.8 C
Shau Kei Wan                 24.4 C               33.0 C
Kowloon City                 25.5 C               33.1 C
Happy Valley                 25.3 C               34.1 C
Wong Tai Sin                 26.1 C               33.7 C
Stanley                      25.5 C               33.4 C
Kwun Tong                    25.3 C               33.0 C
Sham Shui Po                 26.0 C               33.8 C
Kai Tak Runway Park          25.3 C               32.9 C
Yuen Long Park               25.3 C               33.7 C

Duration of sunshine (King's Park):              8.9 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 9.
 

Yesterday's (06 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 06 Oct
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