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Bulletin issued at 11:02 HKT 29/Sep/2017

At 11 a.m. at the Hong Kong Observatory the air temperature was 32 degrees Celsius and the relative humidity 69 per cent.
During the past hour the mean UV Index recorded at King's Park was 5. The intensity of UV radiation was moderate.

Please be reminded that:

The Very Hot Weather Warning is now in force. Very hot weather might cause adverse health effects. Members of the public should take care to avoid heatstroke.

The air temperatures at other places were:

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


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


Climatological Information for 29 Sep

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 10:45 HKT 29/Sep/2017

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

The southeasterly airstream now affecting the coast of Guangdong will be replaced by a fresh easterly airstream.

Weather forecast for today

Sunny periods and a few showers. Very hot during the day. Cloudy tonight. Moderate east to southeasterly winds, becoming fresh easterlies later.

Outlook : A few showers during the weekend. Sunny periods early next week.


(The above forecast period is valid up to 23:59 HKT today, 29/09/2017; 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 29/Sep/2017

N0 WARNING.

GENERAL SITUATION AT 282100 UTC:
AN EASTERLY AIRSTREAM IS GENERALLY AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 290100 UTC:

HONG KONG= E 3-4, UP TO 5 LATER. ISOL SHOWERS. SEA UP TO 2 M LATER. TEMP 33-26 C. =
KWANGTUNG= E TO SE 4-5, UP TO 6 IN E. ISOL SHOWERS AND TS. SEA 2 M, UP TO 3 M IN E. =
TAIWAN STRAIT= NE 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. =
BASHI= E 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA 2 M. =
PRATAS= E 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA 2 M. =
BALINTANG= E 4-5, OCNL 6. ISOL SHOWERS AND SQUALLY TS. SEA 2 M. =
SCARBOROUGH= E TO SE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
PARACEL= E TO SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
TONKIN= E 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= E TO SE 4-5. ISOL SHOWERS AND SQUALLY 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.


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    • 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 09:30 HKT 29/Sep/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 29 September 2017

    Warnings:
    Strong winds in Nan'ao, Shanwei and south of Hong Kong.

    Weather Situation:
    The southeasterly airstream now affecting the coast of Guangdong will be replaced by an easterly airstream.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 3 to 4, up to force 5 later.
    Isolated showers.
    Slight to moderate seas.

    Nan'ao:
    East to northeast force 5 to 6.
    Isolated showers and thunderstorms.
    Moderate to rough seas.

    Shanwei:
    East force 5 to 6.
    Isolated showers and thunderstorms.
    Moderate to rough seas.

    South of Hong Kong:
    East to southeast force 4 to 5, up to force 6 later.
    Isolated showers and thunderstorms.
    Moderate seas, becoming rough later.

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

    Outlook for the next 48 hours
    Easterly winds of force 4 to 5, occasionally force 6. Isolated showers and thunderstorms.

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

    Waglan Island Wind east force 2
      Visibility 49 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 30 Kilometres

    Dongsha Wind east force 2
      Visibility 10 Kilometres

    Macau Wind east force 2
      Visibility 35 Kilometres

    Xisha Wind south force 2
      Visibility 30 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 29/SEP/2017
    (Next update at 17:30 HKT 29/SEP/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE SOUTHEASTERLY AIRSTREAM NOW AFFECTING THE
     COAST OF GUANGDONG WILL BE REPLACED BY A FRESH
     EASTERLY AIRSTREAM.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  110/5-10 BEC 090/10-15
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  110/10 BEC 090/15-20                 30-33
   B.   2000 FT:  120/15-20                            25
   C.   5000 FT:  130/15                               19
   D.  10000 FT:  150/20                               11
   E.  18000 FT:  100/10                               MS3
   F.  24000 FT:  100/10                               MS14
   G.  30000 FT:  120/10                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      SUNNY PERIODS WITH A FEW 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    : 10 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 NEAR CUNIM/TS.
                      MOD OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 1.0 BEC 2.0 M   SEA TEMPERATURE    : 30 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EASTERLY 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 08:05 HKT on 28 Sep 17

    VHHK SIGMET 1 VALID 280005/280405 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2048 E11312 - N2030 E11512 - N1930 E11512 - N1930 E11400 - N2000 E11312 - N2048 E11312 TOP FL420 MOV W 10KT 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

    There is no tropical cyclone warning for shipping*.




    *Tropical cyclone warnings for shipping are issued by the Hong Kong Observatory for tropical cyclones located within the area bounded by 105E and 125E , 10N and 30N.




    For other tropical cyclone related information, please visit the World Meteorological Organization Web Site - Severe Weather Information Centre.

    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 29/Sep/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     34.1 C
Minimum Air Temperature                     28.2 C
Grass Minimum Temperature                   27.3 C
Relative Humidity                        59 - 86 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2406.3 mm
Against an average of                     2216.3 mm

Other Stations                Min                  Max
King's Park                  27.8 C               33.6 C
Wong Chuk Hang               26.0 C               31.8 C
Ta Kwu Ling                  25.4 C               35.7 C
Lau Fau Shan                 26.6 C               33.0 C
Tai Po                       26.5 C               33.1 C
Sha Tin                      26.1 C               34.1 C
Tuen Mun                     26.6 C               33.9 C
Tseung Kwan O                25.6 C               33.9 C
Sai Kung                     26.7 C               32.4 C
Cheung Chau                  27.0 C               32.6 C
Chek Lap Kok                 27.8 C               33.9 C
Tsing Yi                     26.5 C               32.6 C
Shek Kong                    26.1 C               35.5 C
Tsuen Wan Ho Koon            25.0 C               32.0 C
Tsuen Wan Shing Mun Valley   25.0 C               33.8 C
Hong Kong Park               26.7 C               32.7 C
Shau Kei Wan                 27.5 C               31.8 C
Kowloon City                 27.6 C               34.7 C
Happy Valley                 26.4 C               34.1 C
Wong Tai Sin                 26.5 C               34.3 C
Stanley                      26.7 C               32.7 C
Kwun Tong                    27.7 C               33.4 C
Sham Shui Po                 27.2 C               34.3 C
Kai Tak Runway Park          28.0 C               32.5 C
Yuen Long Park               26.6 C               35.7 C
Tai Mei Tuk               27.2 C               34.6 C

Duration of sunshine (King's Park):              10.9 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.
Sea surface temperature (Waglan Island):        30.0 C 

Yesterday's (28 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                             0.09
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                          0.08
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 28 Sep
     2003copy right image | Important notices | Privacy policy Last revision date: <29 Sep 2017> 

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