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Bulletin issued at 00:02 HKT 23/Sep/2019

At midnight at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 48 per cent.

Please be reminded that:

The Fire Danger Warning is Red and the fire risk is extreme.

The air temperatures at other places were:

King's Park 27 degrees;
Wong Chuk Hang 26 degrees;
Ta Kwu Ling 24 degrees;
Lau Fau Shan 25 degrees;
Tai Po 27 degrees;
Sha Tin 27 degrees;
Tuen Mun 25 degrees;
Tseung Kwan O 24 degrees;
Sai Kung 27 degrees;
Cheung Chau 25 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 27 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 25 degrees;
Hong Kong Park 27 degrees;
Shau Kei Wan 26 degrees;
Kowloon City 26 degrees;
Happy Valley 28 degrees;
Wong Tai Sin 27 degrees;
Stanley 27 degrees;
Kwun Tong 26 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 28 degrees;
Yuen Long Park 26 degrees;
Tai Mei Tuk 26 degrees.


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


Climatological Information for 23 Sep

Regional Weather in Hong Kong

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Bulletin updated at 00:00 HKT 23/Sep/2019

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

The northeast monsoon continued to affect southern China yesterday. Locally, the weather was fine. It was very dry during the day. The relative humidity over the territory once fell to 40 per cent or below. The northeast monsoon is expected to bring mainly fine weather to southern China in the next few days.

Besides, Typhoon Tapah weakened into a severe tropical storm yesterday. At 11 p.m. last night, Tapah was centred about 160 kilometres east-southeast of Busan. It is forecast to move northeast at about 45 kilometres per hour across the Sea of Japan and gradually evolve into an extratropical cyclone.

Weather forecast for Hong Kong (Monday, 23 Sep 2019)

Mainly fine and dry. Light rain at night. Temperatures will range between 25 and 31 degrees. Moderate to fresh east to northeasterly winds.

Outlook : Mainly fine in the following few days, apart from one or two rain patches on Tuesday morning.


(The above forecast period is valid up to 23:59 HKT today, 23/09/2019; 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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Bulletin issued at 21:00 HKT 22/Sep/2019

N0 WARNING.

GENERAL SITUATION AT 220900 UTC:
THE NORTHEAST MONSOON IS GENERALLY AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 221300 UTC:

HONG KONG= N TO NE 5-6, E 5-6 LATER. A FEW LIGHT RAIN PATCHES. SEA 2-3 M. SWELL NE 2 M. TEMP 25-31 C. =
KWANGTUNG= N TO NE 5-6, E 5-6 LATER. ISOL SHOWERS. SEA 2-3 M. SWELL NE 2 M. =
TAIWAN STRAIT= E TO NE 5-6. CLOUDY. SEA 2-3 M. SWELL NE 3-4 M. =
BASHI= E TO NE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL NE 2-3 M. =
PRATAS= N TO NE 4-5, E 4-5 LATER. ISOL SHOWERS. SEA UP TO 2 M. SWELL NE 2-3 M. =
BALINTANG= E TO NE 4-5. ISOL SHOWERS. SEA UP TO 2 M. SWELL NE 2-3 M. =
SCARBOROUGH= E TO NE 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
PARACEL= N TO NE 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
TONKIN= N TO NE 5-6. ISOL SHOWERS. SEA 2-3 M. =
DANANG= N TO NE 5-6. ISOL SHOWERS. SEA 2-3 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

    Current Weather | Local Weather Forecast | Regional Temperature Forecast in HK
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    Bulletin issued at 23:30 HKT 22/Sep/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 22 September 2019

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    The northeast monsoon is affecting the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North to northeast force 5 to 6, becoming east force 5 to 6 later.
    One or two rain patches later.
    Moderate to rough seas.

    Nan'ao and Shangchuan Dao:
    North to northeast force 5 to 6.
    Moderate to rough seas.

    Shanwei and South of Hong Kong:
    North to northeast force 5 to 6, becoming east force 5 to 6 later.
    Moderate to rough seas.

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

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

    Waglan Island Wind north force 4
      Visibility 50 Kilometres or above

    Shantou Wind south force 1
      Visibility 30 Kilometres

    Huangmaozhou Wind north-northeast force 5

    Macau Wind north force 2
      Visibility 30 Kilometres

    Xisha Wind northeast force 2
      Visibility 26 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 17:30 HKT 22/SEP/2019
    (Next update at 01:30 HKT 23/SEP/2019)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE NORTHEAST MONSOON IS BRINGING FINE AND DRY
     WEATHER TO SOUTHERN CHINA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  010/10-15
       OFFSHORE:  020/15-20, OCNL 25                   31-25
   B.   2000 FT:  020/20-25                            23
   C.   5000 FT:  040/20-25                            16
   D.  10000 FT:  300/15                               11
   E.  18000 FT:  280/10                               MS1
   F.  24000 FT:  270/5-10                             MS13
   G.  30000 FT:  220/15                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      3500-4000 FT.
   I. WEATHER       : 
      FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      NO CLOUDS OF HEIGHT AT OR BELOW 10000 FT.
   K. VISIBILITY    : 10 KM.
   L. 0 DEG. C LEVEL: 15500 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND AT LOW LEVELS.
   N. SEA STATE     : 2.0-3.0 M     SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EAST TO NORTHEASTERLY WINDS.
     MAINLY 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.

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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)

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    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 23/Sep/2019 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.3 C
Minimum Air Temperature                     25.9 C
Grass Minimum Temperature                   22.4 C
Relative Humidity                        34 - 50 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2233.2 mm
Against an average of                     2172.2 mm

Other Stations                Min                  Max
King's Park                  25.6 C               30.2 C
Wong Chuk Hang               26.0 C               30.9 C
Ta Kwu Ling                  20.4 C               30.8 C
Lau Fau Shan                 24.8 C               29.5 C
Tai Po                       24.6 C               29.6 C
Sha Tin                      26.4 C               30.8 C
Tuen Mun                     25.1 C               30.6 C
Tseung Kwan O                23.7 C               31.1 C
Sai Kung                     26.2 C               29.6 C
Cheung Chau                  23.7 C               30.9 C
Chek Lap Kok                 26.4 C               31.5 C
Tsing Yi                     25.5 C               31.3 C
Tsuen Wan Ho Koon            24.3 C               29.3 C
Tsuen Wan Shing Mun Valley   23.0 C               31.2 C
Hong Kong Park               25.5 C               31.6 C
Shau Kei Wan                 25.6 C               31.5 C
Kowloon City                 25.6 C               30.5 C
Happy Valley                 26.5 C               32.4 C
Wong Tai Sin                 25.7 C               31.7 C
Stanley                      26.2 C               31.9 C
Kwun Tong                    25.5 C               30.3 C
Sham Shui Po                 25.7 C               31.2 C
Kai Tak Runway Park          26.6 C               31.1 C
Yuen Long Park               23.3 C               31.8 C
Tai Mei Tuk               25.0 C               30.3 C

Duration of sunshine (King's Park):              11.2 H
The mean UV index recorded at King's Park yesterday was 5,
the UV intensity was Moderate.
The maximum UV index for yesterday was 9.
 

Yesterday's (22 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                           0.12
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 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 22 Sep
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