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Bulletin issued at 05:02 HKT 21/Jul/2018

At 5 a.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 86 per cent.

The air temperatures at other places were:

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


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


Climatological Information for 21 Jul

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 04:45 HKT 21/Jul/2018

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

The weather is generally fine over southeastern China. Meanwhile, an area of low pressure over the central and northern parts of the South China Sea is bringing unsettled weather to the region.

At 5 a.m., Severe Tropical Storm Ampil was centred about 120 kilometres east of Okinawa. It is forecast to move northwest at about 28 kilometres per hour towards the vicinity of the Ryukyu Islands.

Weather forecast for today

Mainly cloudy with isolated showers. Very hot with sunny periods during the day. The maximum temperature will be around 33 degrees. Light to moderate easterly winds.

Outlook : Very hot and mainly fine with isolated showers tomorrow. More showers in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 21/07/2018; 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 20/Jul/2018

N0 WARNING.

GENERAL SITUATION AT 200900 UTC:
LOW 1002 HPA 18N 116E E 10 KT INTSF

MARINE FORECAST FOR 24 HOURS FROM 201300 UTC:

HONG KONG= E TO NE 4-5, W TO SW 4-5 LATER. ISOL SHOWERS AND TS. SEA UP TO 2 M. TEMP 27-33 C. =
KWANGTUNG= E TO NE 4-5, OCNL 6, W TO SW 4-5 LATER. ISOL SHOWERS AND TS. SEA UP TO 3 M, UP TO 2 M LATER. SWELL SW 2 M. =
TAIWAN STRAIT= NE 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. =
BASHI= W TO SW 4-5, BEC E TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M, BEC 2-3 M. SWELL SW 2-3 M. =
PRATAS= E TO NE 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 2 M. =
BALINTANG= W TO SW 4-5, BEC E TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M, BEC 2-3 M. SWELL SW 2-3 M. =
SCARBOROUGH= W TO SW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 2-3 M. =
PARACEL= W TO SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2-3 M. =
TONKIN= S 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. =
DANANG= S TO SW 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 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 05:30 HKT 21/Jul/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 21 July 2018

    Weather Situation:
    An area of low pressure over the central and northern parts of the South China Sea is bringing unsettled weather to the south China coastal waters.

    At 5 a.m., Severe Tropical Storm Ampil with maximum sustained winds of about 90 kilometres per hour near its centre was located near 26.0 degrees north, 128.9 degrees east. It is forecast to move northwest at about 28 kilometres per hour towards the vicinity of the Ryukyu Islands.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to northeast force 4, becoming west to southwest force 4.
    Isolated showers and thunderstorms.
    Moderate seas.

    Nan'ao and Shanwei:
    East to northeast force 4 to 5, becoming north to northwest force 4 to 5 later.
    Isolated showers and thunderstorms.
    Moderate to rough seas.

    South of Hong Kong and Shangchuan Dao:
    East to northeast force 4 to 5, becoming west to southwest force 4 to 5.
    Isolated showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    South to southwesterly winds of force 5 to 6, occasionally force 7. Isolated squally showers and thunderstorms.

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

    Waglan Island Wind northeast force 2
      Visibility 24 Kilometres

    Shantou Wind east force 1
      Visibility 30 Kilometres

    Dongsha Wind east-northeast force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 2

    Macau Wind south-southeast force 1
      Visibility 11 Kilometres

    Xisha Wind north-northwest force 2
      Visibility 16 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 01:30 HKT 21/JUL/2018
    (Next update at 9:00-9:30 HKT 21/JUL/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN AREA OF LOW PRESSURE OVER THE CENTRAL AND
     NORTHERN PARTS OF THE SOUTH CHINA SEA IS
     BRINGING UNSETTLED WEATHER TO THE SOUTH CHINA
     COASTAL WATERS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  100/5-10
       OFFSHORE:  090/10-15                            27-32
   B.   2000 FT:  110/10-15                            23
   C.   5000 FT:  090/15                               20
   D.  10000 FT:  080/15                               12
   E.  18000 FT:  070/10                               MS1
   F.  24000 FT:  070/20                               MS12
   G.  30000 FT:  080/10                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH ISOLATED SHOWERS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 FT.
   K. VISIBILITY    : 10 KM.  TEMPO 4000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD OFFSHORE AND NEAR HILLS AT FIRST
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT WINDS. SUNNY PERIODS APART FROM ISOLATED
     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 00:50 HKT on 21 Jul 18

    VHHK SIGMET 4 VALID 201255/201655 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1806 E11312 - N1812 E11512 - N1642 E11400 - N1930 E11130 - N1954 E11130 - N1954 E11142 - N1806 E11312 TOP FL500 STNR NC= VHHK SIGMET 5 VALID 201655/202055 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1742 E11354 - N1724 E11436 - N1642 E11400 - N1830 E11224 - N1836 E11242 - N1742 E11354 TOP FL500 STNR 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 21/Jul/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.6 C
Minimum Air Temperature                     26.0 C
Grass Minimum Temperature                   25.6 C
Relative Humidity                        73 - 97 Percent
Rainfall                                     7.1 mm 
Total rainfall since 1st January           934.3 mm
Against an average of                     1333.8 mm

Other Stations                Min                  Max
King's Park                  25.7 C               30.8 C
Wong Chuk Hang               25.7 C               30.7 C
Ta Kwu Ling                  25.5 C               32.0 C
Lau Fau Shan                 25.1 C               31.5 C
Tai Po                       26.2 C               30.6 C
Sha Tin                      26.3 C               31.7 C
Tuen Mun                     25.5 C               31.1 C
Tseung Kwan O                25.8 C               30.8 C
Sai Kung                     26.9 C               30.3 C
Cheung Chau                  24.8 C               29.1 C
Chek Lap Kok                 26.5 C               33.3 C
Tsing Yi                     25.9 C               31.9 C
Shek Kong                    25.8 C               32.1 C
Tsuen Wan Ho Koon            24.6 C               30.6 C
Tsuen Wan Shing Mun Valley   25.6 C               31.0 C
Hong Kong Park               25.2 C               30.6 C
Shau Kei Wan                 25.0 C               30.2 C
Kowloon City                 25.7 C               31.6 C
Happy Valley                 26.4 C               31.9 C
Wong Tai Sin                 26.0 C               31.1 C
Stanley                      25.7 C               30.3 C
Kwun Tong                    25.9 C               30.8 C
Sham Shui Po                 25.9 C               32.7 C
Kai Tak Runway Park          26.1 C               30.1 C
Yuen Long Park               25.6 C               32.5 C
Tai Mei Tuk               25.5 C               31.4 C

Duration of sunshine (King's Park):              6.4 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 11.
 

Yesterday's (20 Jul 2018) 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                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.11
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.08
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.12
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 20 Jul
     2003copy right image | Important notices | Privacy policy Last revision date: <21 Jul 2018> 

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