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Bulletin issued at 11:02 HKT 20/Sep/2019

At 11 a.m. at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 45 per cent.
During the past hour the mean UV Index recorded at King's Park was 7. The intensity of UV radiation was high.

Please be reminded that:

The Fire Danger Warning is Red and the fire risk is extreme.
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 30 degrees;
Wong Chuk Hang 31 degrees;
Ta Kwu Ling 30 degrees;
Lau Fau Shan 29 degrees;
Tai Po 29 degrees;
Sha Tin 31 degrees;
Tuen Mun 31 degrees;
Tseung Kwan O 31 degrees;
Sai Kung 29 degrees;
Cheung Chau 29 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 31 degrees;
Hong Kong Park 31 degrees;
Shau Kei Wan 31 degrees;
Kowloon City 30 degrees;
Happy Valley 32 degrees;
Wong Tai Sin 31 degrees;
Stanley 30 degrees;
Kwun Tong 31 degrees;
Sham Shui Po 31 degrees;
Kai Tak Runway Park 31 degrees;
Yuen Long Park 32 degrees;
Tai Mei Tuk 31 degrees.


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


Climatological Information for 20 Sep

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 10:45 HKT 20/Sep/2019

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

A continental airstream is bringing generally fine weather to southern China.

At 10 a.m., Tropical Storm Tapah was centred about 360 kilometres south-southwest of Okinawa. It is forecast to move northwest at about 10 kilometres and intensify gradually.

Weather forecast for today

Fine and dry. Very hot during the day. Moderate north to northeasterly winds.

Outlook : Fine and dry in the next couple of days.


(The above forecast period is valid up to 23:59 HKT today, 20/09/2019; 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 20/Sep/2019

GALE WARNING AREAS: TAIWAN STRAIT, BASHI AND BALINTANG.

GENERAL SITUATION AT 192100 UTC:
A NORTHEASTERLY AIRSTREAM IS GENERALLY AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 200100 UTC:

HONG KONG= N TO NE 4-5. FINE. SEA UP TO 2 M. SWELL E TO NE 2 M. TEMP 33-26 C. =
KWANGTUNG= NE 5-6, 7 IN E. ISOL SHOWERS. SEA 2-3 M, UP TO 4 M IN E. SWELL E TO NE 3 M. =
TAIWAN STRAIT= N TO NE 7-8. ISOL SHOWERS. SEA 4-6 M. SWELL NE 3 M. =
BASHI= N TO NE 7-8. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 3-5 M. =
PRATAS= N TO NE 5-6, OCNL 7. ISOL SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 3 M. =
BALINTANG= N TO NE 7-8. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 3-5 M. =
SCARBOROUGH= NW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL NE 3 M. =
PARACEL= N TO NE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL NE 3 M. =
TONKIN= N TO NE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= N TO NE 4-5. ISOL 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
  • 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 09:30 HKT 20/Sep/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 20 September 2019

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

    Weather Situation:
    .

    At 9 a.m., Tropical Storm Tapah with maximum sustained winds of about 75 kilometres per hour near its centre was located at 23.0 degrees north, 127.0 degrees east. It is forecast to move northwest at about 10 kilometres per hour and intensify gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North to northeast force 4 to 5.
    Moderate seas.

    Nan'ao:
    North to northeast force 6 to 7, occasionally force 8.
    Rough to very rough seas.

    Shanwei:
    North to northeast force 5 to 6, occasionally force 7.
    Moderate to rough seas.

    South of Hong Kong:
    North to northeast force 4 to 5, occasionally force 6.
    Moderate to rough seas.

    Shangchuan Dao:
    North to northeast force 4 to 5.
    Moderate seas.

    Outlook for the next 48 hours
    North to northeasterly winds of force 5 to 6.

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

    Waglan Island Wind north force 5
      Visibility 50 Kilometres or above

    Shantou Wind east force 2
      Visibility 17 Kilometres

    Huangmaozhou Wind north-northwest force 3

    Macau Wind north force 2
      Visibility 17 Kilometres

    Xisha Wind north-northeast force 2
      Visibility 16 Kilometres

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

    Bulletin issued at 09:30 HKT 20/SEP/2019
    (Next update at 12:30 HKT 20/SEP/2019)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A CONTINENTAL AIRSTREAM IS BRINGING GENERALLY
     FINE WEATHER TO SOUTHERN CHINA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  020/5-10
       OFFSHORE:  020/10-15                            27-33
   B.   2000 FT:  020/15-20                            23
   C.   5000 FT:  020/20-25                            17
   D.  10000 FT:  010/20                               12
   E.  18000 FT:  010/15                               0
   F.  24000 FT:  010/15                               MS14
   G.  30000 FT:  010/15                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT.
   K. VISIBILITY    : 9 KM.
   L. 0 DEG. C LEVEL: 18000 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD NEAR HILLS.
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTH TO NORTHEASTERLY WINDS,
     OCCASIONALLY FRESH. FINE.=

    ===================================================================
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.

    There is no Significant Weather Information (SIGMET)

    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 20/Sep/2019 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     32.4 C
Minimum Air Temperature                     24.9 C
Grass Minimum Temperature                   24.8 C
Relative Humidity                        53 - 95 Percent
Rainfall                                     8.7 mm 
Total rainfall since 1st January          2233.2 mm
Against an average of                     2140.7 mm

Other Stations                Min                  Max
King's Park                  24.6 C               32.1 C
Wong Chuk Hang               24.3 C               31.8 C
Ta Kwu Ling                  25.0 C               33.3 C
Lau Fau Shan                 25.2 C               32.3 C
Tai Po                       23.8 C               30.9 C
Sha Tin                      24.3 C               33.0 C
Tuen Mun                     25.3 C               32.9 C
Tseung Kwan O                23.3 C               32.5 C
Sai Kung                     25.1 C               31.3 C
Cheung Chau                  23.7 C               32.6 C
Chek Lap Kok                 26.3 C               32.5 C
Tsing Yi                     24.2 C               32.4 C
Shek Kong                    24.3 C               33.1 C
Tsuen Wan Ho Koon            22.4 C               31.0 C
Tsuen Wan Shing Mun Valley   23.4 C               33.1 C
Hong Kong Park               24.3 C               32.5 C
Kowloon City                 24.3 C               33.0 C
Happy Valley                 25.0 C               33.1 C
Wong Tai Sin                 24.2 C               33.6 C
Stanley                      24.3 C               31.9 C
Kwun Tong                    24.3 C               32.5 C
Sham Shui Po                 24.5 C               33.4 C
Kai Tak Runway Park          24.9 C               32.1 C
Yuen Long Park               24.9 C               34.1 C
Tai Mei Tuk               24.4 C               32.5 C

Duration of sunshine (King's Park):              10.3 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 (19 Sep 2019) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 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                           0.09
Tap Mun                             0.09
Kat O                               0.11
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.11
Sha Tau Kok                         0.10
Kwun Tong                           0.13
Sai Wan Ho                          0.10
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.14
Chek Lap Kok                        0.14

Note

      

    1. From readings taken at various locations in Hong Kong in the
past, the hourly mean ambient gamma radiation dose rate may
vary between 0.06 and 0.3 microsievert per hour. (1
microsievert = 0.000001 sievert = 0.001 millisievert)

    2. Temporal variations are generally caused by changes in
meteorological conditions such as rainfall, wind and
barometric pressure.

    3. Spatial variations are generally caused by differences in
the radioactive content of local rock and soil.

    4. The data displayed is provisional. Only limited data
validation has been carried out.
    Climatological Information for 19 Sep
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