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Bulletin issued at 16:02 HKT 25/Sep/2017

At 4 p.m. at the Hong Kong Observatory the air temperature was 31 degrees Celsius and the relative humidity 77 per cent.
During the past hour the mean UV Index recorded at King's Park was 3. The intensity of UV radiation was moderate.

Hot weather might cause adverse health effects. The Observatory advises the public to stay on the alert.

The air temperatures at other places were:

King's Park 30 degrees;
Wong Chuk Hang 31 degrees;
Ta Kwu Ling 32 degrees;
Lau Fau Shan 31 degrees;
Tai Po 29 degrees;
Sha Tin 31 degrees;
Tuen Mun 30 degrees;
Tseung Kwan O 30 degrees;
Sai Kung 29 degrees;
Cheung Chau 30 degrees;
Chek Lap Kok 31 degrees;
Tsing Yi 33 degrees;
Shek Kong 31 degrees;
Tsuen Wan Ho Koon 29 degrees;
Tsuen Wan Shing Mun Valley 31 degrees;
Hong Kong Park 31 degrees;
Shau Kei Wan 29 degrees;
Kowloon City 31 degrees;
Happy Valley 31 degrees;
Wong Tai Sin 31 degrees;
Stanley 30 degrees;
Kwun Tong 31 degrees;
Sham Shui Po 32 degrees;
Kai Tak Runway Park 30 degrees;
Yuen Long Park 31 degrees;
Tai Mei Tuk 30 degrees.


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


Climatological Information for 25 Sep

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 16:15 HKT 25/Sep/2017

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

Showers are affecting the coast of Guangdong. Meanwhile, the anticyclone aloft over southeastern China is intensifying gradually.

At 4 p.m., the tropical depression over the northern part of Vietnam was centred about 110 kilometres east-northeast of Hanoi. It is forecast to move northwest at about 22 kilometres per hour into the inland areas and dissipate gradually.

Weather forecast for tonight and tomorrow

Cloudy periods with isolated showers tonight and tomorrow morning. The minimum temperature will be about 28 degrees. Mainly fine and hot during the day. The maximum temperature will be around 32 degrees in the urban areas, and a couple of degrees higher in the New Territories. Light to moderate southeasterly winds.

Outlook : Mainly fine and very hot in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 26/09/2017; 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 25/Sep/2017

N0 WARNING.

GENERAL SITUATION AT 242100 UTC:
FOR DETAILS ON TROPICAL DEPRESSION OVER GULF OF TONKIN, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 250100 UTC:

HONG KONG= SE 4-5, OCNL 6 AT FIRST. ISOL SHOWERS AND TS. SEA UP TO 2 M, UP TO 3 M AT FIRST. SWELL SE 2-3 M. TEMP 32-28 C. =
KWANGTUNG= S TO SE 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL SE 2-3 M. =
TAIWAN STRAIT= S 4-5. ISOL SHOWERS. SEA UP TO 2 M. SWELL SE UP TO 2 M. =
BASHI= E 4-5. ISOL SHOWERS. SEA UP TO 2 M. SWELL E TO SE UP TO 2 M. =
PRATAS= S TO SE 4-5. ISOL SHOWERS. SEA UP TO 2 M. SWELL E TO SE 2-3 M. =
BALINTANG= E 4-5. ISOL SHOWERS. SEA UP TO 2 M. SWELL E TO SE UP TO 2 M. =
SCARBOROUGH= NE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL S UP TO 2 M. =
PARACEL= S TO SE 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL E TO SE 2-3 M. =
TONKIN= CYCLONIC 6-7, BEC S TO SE 5-6. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, BEC 2-3 M. SWELL E TO SE 2-3 M. =
DANANG= S TO SW 5-6. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S 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 16:30 HKT 25/Sep/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 25 September 2017

    Weather Situation:
    At 4 p.m., the tropical depression over the northern part of Vietnam with maximum sustained winds of about 45 kilometres per hour near its centre was located at 21.3 degrees north, 106.8 degrees east. It is forecast to move northwest at about 22 kilometres per hour into the inland areas and dissipate gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Southeast force 4 to 5.
    Isolated showers.
    Moderate seas.

    Nan'ao, Shanwei and South of Hong Kong:
    East to southeast force 4 to 5.
    Moderate seas.

    Shangchuan Dao:
    South to southeast force 4 to 5.
    Isolated showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    East to southeasterly winds of force 4 to 5. Isolated showers and thunderstorms.

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

    Waglan Island Wind southeast force 4
      Visibility 19 Kilometres

    Shantou Wind southeast force 2
      Visibility 30 Kilometres

    Macau Wind east-southeast force 2
      Visibility 30 Kilometres

    Xisha Wind south force 2
      Visibility 27 Kilometres

  • Explanation of Seas or Sea Waves
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 09:00 HKT 25/SEP/2017
    (Next update at 17:30 HKT 25/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 8 A.M., THE TROPICAL DEPRESSION OVER BEIBU
     WAN WAS CENTRED NEAR 20.1 DEGREES NORTH, 108.3
     DEGREES EAST.  IT IS FORECAST TO MOVE NORTHWEST
     AT ABOUT 12 KNOTS IN THE GENERAL DIRECTION OF
     THE NORTHERN PART OF VIETNAM.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  140/10-15
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  140/15-20                            29-33
   B.   2000 FT:  160/15-20                            24
   C.   5000 FT:  170/25                               19
   D.  10000 FT:  180/30                               12
   E.  18000 FT:  140/20                               MS2
   F.  24000 FT:  120/20                               MS12
   G.  30000 FT:  080/20                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      SUNNY PERIODS AND A FEW SHOWERS.  ISOLATED
      THUNDERSTORMS AT FIRST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 FT.  TEMPO FEW CB 1000 FT
      SCT 2000 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) : 12000 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS.
                      MOD OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTH TO SOUTHEASTERLY WINDS.  MAINLY
     CLOUDY WITH A FEW SHOWERS.=

    ===================================================================
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 12:15 HKT on 24 Sep 17

    VHHK SIGMET 2 VALID 240120/240420 VHHH- VHHK HONG KONG FIR EMBD TS FCST W OF LINE N2254 E11454 - N1824 E11524 TOP FL450 MOV W 15KT NC= VHHK SIGMET 4 VALID 240420/240820 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF LINE N2142 E11730 - N1948 E11130 TOP FL450 MOV WNW 15KT 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 15:30 HKT 25/Sep/2017


    Tropical Cyclone Warning

    At 250600 UTC, the tropical depression over the northern part of Vietnam with central pressure 1000 hectopascals was centred within 90 nautical miles of two one point one degrees north (21.1 N) one zero seven point one degrees east (107.1 E) and is forecast to move northwest at about 12 knots for the next 24 hours.

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

    Radius of over 2 metre waves 90 nautical miles.

    No further warnings on this Tropical Depression will be issued by the Hong Kong Observatory unless re-intensification takes place.

    Forecast position and intensity at 260600 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 25/Sep/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     30.5 C
Minimum Air Temperature                     27.1 C
Grass Minimum Temperature                   26.5 C
Relative Humidity                        77 - 94 Percent
Rainfall                                     5.6 mm 
Total rainfall since 1st January          2405.8 mm
Against an average of                     2185.4 mm

Other Stations                Min                  Max
King's Park                  26.9 C               30.5 C
Wong Chuk Hang               27.3 C               30.7 C
Ta Kwu Ling                  26.1 C               31.1 C
Lau Fau Shan                 26.3 C               30.6 C
Tai Po                       26.6 C               30.1 C
Sha Tin                      27.8 C               31.1 C
Tuen Mun                     27.6 C               31.8 C
Tseung Kwan O                27.1 C               31.0 C
Sai Kung                     27.5 C               30.2 C
Cheung Chau                  25.4 C               29.6 C
Chek Lap Kok                 27.0 C               32.1 C
Tsing Yi                     27.4 C               32.6 C
Shek Kong                    27.3 C               32.1 C
Tsuen Wan Ho Koon            26.0 C               29.3 C
Tsuen Wan Shing Mun Valley   27.0 C               31.3 C
Hong Kong Park               26.4 C               30.8 C
Shau Kei Wan                 26.3 C               30.2 C
Kowloon City                 26.6 C               31.2 C
Happy Valley                 27.2 C               31.0 C
Wong Tai Sin                 26.7 C               30.7 C
Stanley                      26.3 C               31.0 C
Kwun Tong                    27.1 C               30.7 C
Sham Shui Po                 27.4 C               31.5 C
Kai Tak Runway Park          27.2 C               30.3 C
Yuen Long Park               27.4 C               32.6 C
Tai Mei Tuk               25.9 C               29.7 C

Duration of sunshine (King's Park):              2.4 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 7.
Sea surface temperature (Waglan Island):        29.7 C 

Yesterday's (24 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 24 Sep
     2003copy right image | Important notices | Privacy policy Last revision date: <25 Sep 2017> 

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