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Bulletin issued at 06:30 HKT 24/Sep/2017

At 6 a.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 94 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 28 degrees;
Wong Chuk Hang 27 degrees;
Ta Kwu Ling 29 degrees;
Lau Fau Shan 27 degrees;
Tai Po 29 degrees;
Sha Tin 30 degrees;
Tuen Mun 29 degrees;
Tseung Kwan O 28 degrees;
Sai Kung 29 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 30 degrees;
Tsing Yi 29 degrees;
Shek Kong 29 degrees;
Tsuen Wan Ho Koon 28 degrees;
Tsuen Wan Shing Mun Valley 29 degrees;
Hong Kong Park 27 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 28 degrees;
Happy Valley 27 degrees;
Wong Tai Sin 28 degrees;
Stanley 27 degrees;
Kwun Tong 28 degrees;
Sham Shui Po 29 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 29 degrees;
Tai Mei Tuk 28 degrees.

Between 4:45 and 5:45 a.m., lightning was detected within Lantau, Hong Kong and Kowloon. The rainfall recorded in various regions were:

Islands District 0 to 13 mm;
Southern District 1 to 9 mm;
Wan Chai 3 to 7 mm;
Central & Western District 1 to 5 mm;
Eastern District 2 to 5 mm;
Yau Tsim Mong 0 to 3 mm;
Sai Kung 0 to 1 mm;
Kowloon City 0 to 1 mm;
Kwun Tong 0 to 1 mm.

Here is the information on Tropical Depression:
Location: 18.2 degrees north, 114.2 degrees east; Maximum sustained wind near its centre: 45 km/h.


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


Climatological Information for 24 Sep

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 05:45 HKT 24/Sep/2017

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

Weather forecast for today

Mainly cloudy. A few showers and squalls. There will be isolated thunderstorms. Sunny intervals during the day. The maximum temperature will be around 31 degrees. Moderate to fresh east to southeasterly winds, strong offshore and on high ground. There will be swells.

Outlook : Still a few showers tomorrow. Becoming fine and very hot midweek this week.


(The above forecast period is valid up to 23:59 HKT today, 24/09/2017; 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 23/Sep/2017

N0 WARNING.

GENERAL SITUATION AT 230900 UTC:
AN EASTERLY AIRSTREAM IS GENERALLY AFFECTING THE FORECAST AREAS. LOW 1002HPA 17N 116E W 10KT INTST NC.

MARINE FORECAST FOR 24 HOURS FROM 231300 UTC:

HONG KONG= E TO SE 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. TEMP 27-31 C. =
KWANGTUNG= E TO SE 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. =
TAIWAN STRAIT= E TO NE 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. =
BASHI= E TO SE 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL E UP TO 2 M. =
PRATAS= E TO SE 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL E 2 M. =
BALINTANG= E TO SE 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL E 2 M. =
SCARBOROUGH= SE 5-6, OCNL 7. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL E 2 M. =
PARACEL= E TO SE 5-6, UP TO 7 LATER. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 4 M LATER. SWELL E 2 M LATER. =
TONKIN= E 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= E 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL E 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

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    Bulletin issued at 05:30 HKT 24/Sep/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 24 September 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    At 5 a.m., the tropical depression over the northern part of the South China Sea with maximum sustained winds of about 45 kilometres per hour near its centre was located near 18.2 degrees north, 114.4 degrees east. It is forecast to move west-northwest at about 25 kilometres per hour towards the vicinity of the western part of Guangdong to Hainan Island.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to southeast force 5 to 6, occasionally force 7.
    Isolated squally showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao, Shanwei and South of Hong Kong:
    East to southeast force 5 to 6, occasionally force 7.
    Isolated squally showers and thunderstorms.
    Moderate to rough seas.

    Shangchuan Dao:
    East force 5 to 6, becoming cyclonic up to force 7.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    Southerly winds of force 5 to 6. Isolated squally showers and thunderstorms.

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

    Waglan Island Wind east force 6
      Visibility 3800 Metres

    Shantou Wind northeast force 2
      Visibility 30 Kilometres

    Macau Wind east-northeast force 1
      Visibility 23 Kilometres

    Xisha Wind north-northwest force 2
      Visibility 22 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
  • Descriptive Terms of Wind Speeds
  • Visibility Readings in Hong Kong Waters
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 24/SEP/2017
    (Next update at 9:00-9:30 HKT 24/SEP/2017)
    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 1 A.M., THE TROPICAL DEPRESSION OVER THE
     CENTRAL PART OF THE SOUTH CHINA SEA WAS CENTERED
     NEAR 17.8 DEGREES NORTH 115.8 DEGREES EAST. IT
     IS FORECAST TO MOVE WEST-NORTHWEST AT ABOUT 14
     KNOTS TOWARDS THE VICINITY OF THE WESTERN PART
     OF GUANGDONG TO HAINAN ISLAND.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  090/10-15
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  090/15-25                            27-31
   B.   2000 FT:  100/20-25                            22
   C.   5000 FT:  090/20-25                            20
   D.  10000 FT:  090/20-25                            12
   E.  18000 FT:  100/20                               MS3
   F.  24000 FT:  090/20                               MS13
   G.  30000 FT:  080/20                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH ISOLATED SHOWERS AND
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT  SCT 4000 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: 18000 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS, NEAR HILLS AND MOD OFFSHORE.
   N. SEA STATE     : 2.5-3.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EAST TO SOUTHEASTERLY WINDS,
     OCCASIONALLY STRONG OFFSHORE AND ON HIGH GROUND.
     MAINLY CLOUDY WITH ISOLATED SHOWERS AND
     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 05:20 HKT on 24 Sep 17

    VHHK SIGMET 3 VALID 231720/232120 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1642 E11400 - N1918 E11142 - N1954 E11212 - N2200 E11730 - N2100 E11730 TOP FL450 MOV W 15KT NC= VHHK SIGMET 4 VALID 232120/240120 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1642 E11400 - N1918 E11142 - N1954 E11212 - N2200 E11730 - N2100 E11730 TOP FL450 MOV W 15KT NC=

    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 05:45 HKT 24/Sep/2017

    Tropical Cyclone Warning Bulletin

    Here is the latest Tropical Cyclone Warning 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 6 a.m., the tropical depression over the northern part of the South China Sea was estimated to be about 450 kilometres south of Hong Kong (near 18.2 degrees north 114.2 degrees east) and is forecast to move west-northwest at about 25 kilometres per hour towards the vicinity of the western part of Guangdong and Hainan Island.
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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 06:30 HKT 24/Sep/2017


    Tropical Cyclone Warning

    At 232100 UTC, the tropical depression over the northern part of the South China Sea with central pressure 1002 hectopascals was centred within 90 nautical miles of one eight point two degrees north (18.2 N) one one four point four degrees east (114.4 E) and is forecast to move west-northwest at about 14 knots for the next 24 hours.

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

    Radius of over 2 metre waves 180 nautical miles.

    Forecast position and intensity at 242100 UTC
    Two zero point four degrees north (20.4 N)
    One zero nine point three degrees east (109.3 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 252100 UTC
    Dissipated over land.



    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 24/Sep/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.4 C
Minimum Air Temperature                     26.7 C
Grass Minimum Temperature                   26.2 C
Relative Humidity                        74 - 98 Percent
Rainfall                                    33.4 mm 
Total rainfall since 1st January          2400.2 mm
Against an average of                     2177.6 mm

Other Stations                Min                  Max
King's Park                  26.1 C               31.0 C
Wong Chuk Hang               26.8 C               31.3 C
Ta Kwu Ling                  26.7 C               32.9 C
Lau Fau Shan                 25.8 C               32.0 C
Tai Po                       26.9 C               30.6 C
Sha Tin                      27.4 C               31.7 C
Tuen Mun                     26.0 C               32.0 C
Tseung Kwan O                26.8 C               30.0 C
Sai Kung                     27.9 C               30.4 C
Cheung Chau                  25.7 C               30.7 C
Chek Lap Kok                 27.0 C               33.5 C
Tsing Yi                     26.3 C               32.0 C
Shek Kong                    26.4 C               32.5 C
Tsuen Wan Ho Koon            25.5 C               29.9 C
Tsuen Wan Shing Mun Valley   25.8 C               31.0 C
Hong Kong Park               25.6 C               30.8 C
Shau Kei Wan                 25.3 C               30.2 C
Kowloon City                 25.9 C               32.2 C
Happy Valley                 26.6 C               31.4 C
Wong Tai Sin                 26.1 C               31.6 C
Stanley                      25.9 C               30.3 C
Kwun Tong                    26.2 C               30.5 C
Sham Shui Po                 26.5 C               32.4 C
Kai Tak Runway Park          26.1 C               30.4 C
Yuen Long Park               26.5 C               33.1 C
Tai Mei Tuk               27.2 C               31.4 C

Duration of sunshine (King's Park):              5.5 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.
Sea surface temperature (Waglan Island):        29.7 C 

Yesterday's (23 Sep 2017) 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                             0.08
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                      0.13
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 23 Sep
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