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Bulletin issued at 13:02 HKT 01/Aug/2018

At 1 p.m. at the Hong Kong Observatory the air temperature was 32 degrees Celsius and the relative humidity 70 per cent.
During the past hour the mean UV Index recorded at King's Park was 9. The intensity of UV radiation was very high.

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 30 degrees;
Ta Kwu Ling 32 degrees;
Lau Fau Shan 31 degrees;
Tai Po 30 degrees;
Sha Tin 33 degrees;
Tuen Mun 33 degrees;
Tseung Kwan O 30 degrees;
Sai Kung 30 degrees;
Cheung Chau 30 degrees;
Chek Lap Kok 33 degrees;
Tsing Yi 32 degrees;
Shek Kong 34 degrees;
Tsuen Wan Ho Koon 31 degrees;
Tsuen Wan Shing Mun Valley 31 degrees;
Hong Kong Park 31 degrees;
Shau Kei Wan 31 degrees;
Kowloon City 32 degrees;
Happy Valley 32 degrees;
Wong Tai Sin 30 degrees;
Stanley 30 degrees;
Kwun Tong 32 degrees;
Sham Shui Po 32 degrees;
Kai Tak Runway Park 31 degrees;
Yuen Long Park 32 degrees;
Tai Mei Tuk 30 degrees.

Between 11:45 a.m. and 12:45 p.m., lightning was detected within New Territories East. The rainfall recorded in various regions were:

Tai Po 0 to 4 mm;
North District 0 to 2 mm.


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


Climatological Information for 1 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 12:45 HKT 01/Aug/2018

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

An anticyclone aloft is affecting southeastern China. Meanwhile, a southwesterly airstream is bringing showers to the coast of Guangdong.

At noon, Tropical Storm Jongdari was centred about 580 kilometres east-southeast of Shanghai. It is forecast to move southwest at about 12 kilometres per hour across the East China Sea in the general direction of the coast of Jiangsu to Zhejiang.

Weather forecast for this afternoon and tonight

Mainly cloudy. Very hot with sunny periods in the afternoon. There will be one or two showers and isolated thunderstorms at first. Moderate southwesterly winds.

Outlook : Sunny periods and a few showers in the next few days. It will be very hot during the day.


(The above forecast period is valid up to 23:59 HKT today, 01/08/2018; 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 09:00 HKT 01/Aug/2018

N0 WARNING.

GENERAL SITUATION AT 312100 UTC:
A SOUTHWESTERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 010100 UTC:

HONG KONG= SW 3-4, OCNL 5. ISOL SHOWERS AND TS. SEA UP TO 2 M. TEMP 33-28 C. =
KWANGTUNG= S TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
TAIWAN STRAIT= SW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL N TO NE UP TO 2 M. =
BASHI= W TO SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL N TO NE UP TO 2 M. =
PRATAS= W TO SW 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
BALINTANG= W TO SW 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL N TO NE UP TO 2 M. =
SCARBOROUGH= SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL SW UP TO 2 M. =
PARACEL= S TO SW 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL SW UP TO 2 M. =
TONKIN= S TO SW 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 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 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 12:30 HKT 01/Aug/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 p.m. on 01 August 2018

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

    Weather Situation:
    A southwesterly airstream is affecting the south China coastal waters.

    At noon, Tropical Storm Jongdari with maximum sustained winds of about 65 kilometres per hour near its centre was located near 29.9 degrees north, 127.3 degrees east. It is forecast to move southwest at about 12 kilometres per hour across the East China Sea in the general direction of the coast of Jiangsu to Zhejiang.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Southwest force 3 to 4, occasionally force 5.
    Isolated showers and thunderstorms.
    Slight to moderate seas.

    Nan'ao and Shanwei:
    West to southwest force 4 to 5, occasionally force 6.
    Moderate to rough seas.

    South of Hong Kong and Shangchuan Dao:
    Southwest force 4 to 5, occasionally force 6.
    Isolated showers and thunderstorms.
    Moderate to rough seas.

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

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

    Waglan Island Wind west-southwest force 2
      Visibility 46 Kilometres

    Shantou Wind southwest force 2
      Visibility 30 Kilometres

    Dongsha Wind west-southwest force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind west-southwest force 3

    Macau Wind south-southwest force 2
      Visibility 29 Kilometres

    Xisha Wind south-southwest 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 12:30 HKT 01/AUG/2018
    (Next update at 17:30 HKT 01/AUG/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A SOUTHWESTERLY AIRSTREAM IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1300 TO 2300 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  220/5-10
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  220/10-15                            33-29
   B.   2000 FT:  220/15                               25
   C.   5000 FT:  240/15                               20
   D.  10000 FT:  240/10                               12
   E.  18000 FT:  240/15                               MS2
   F.  24000 FT:  270/10                               MS13
   G.  30000 FT:  330/10                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      SUNNY INTERVALS WITH A FEW SHOWERS AND ISOLATED
      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) : 11000 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS.  MOD NEAR HILLS.
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTHWESTERLY WINDS.  MAINLY CLOUDY AND
     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 15:06 HKT on 30 Jul 18

    VHHK SIGMET 1 VALID 300417/300815 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2054 E11236 - N1900 E11248 - N1848 E11206 - N1930 E11130 - N2054 E11130 - N2054 E11236 TOP FL420 STNR NC= VHHK SIGMET 5 VALID 300709/301100 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1948 E11330 - N1836 E11218 - N1930 E11130 - N2106 E11130 - N2130 E11324 - N1948 E11330 TOP FL420 MOV NNE 10KT NC= VHHK SIGMET 4 VALID 300706/301100 VHHH- VHHK HONG KONG FIR WI N1948 E11330 - N1836 E11218 - N1930 E11130 - N2106 E11130 - N2130 E11324 - N1948 E11330 TOP FL420 MOV NNE 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 01/Aug/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     33.2 C
Minimum Air Temperature                     27.1 C
Grass Minimum Temperature                   26.7 C
Relative Humidity                        61 - 91 Percent
Rainfall                                     3.3 mm 
Total rainfall since 1st January           974.9 mm
Against an average of                     1473.3 mm

Other Stations                Min                  Max
King's Park                  27.3 C               33.3 C
Wong Chuk Hang               25.9 C               31.7 C
Ta Kwu Ling                  25.3 C               33.7 C
Lau Fau Shan                 27.3 C               31.7 C
Tai Po                       27.0 C               33.7 C
Sha Tin                      27.6 C               34.0 C
Tuen Mun                     27.5 C               33.1 C
Tseung Kwan O                26.9 C               34.6 C
Sai Kung                     27.9 C               34.7 C
Cheung Chau                  27.2 C               32.8 C
Chek Lap Kok                 29.0 C               34.6 C
Tsing Yi                     26.3 C               33.1 C
Shek Kong                    27.0 C               34.5 C
Tsuen Wan Ho Koon            26.7 C               31.6 C
Tsuen Wan Shing Mun Valley   26.9 C               32.5 C
Hong Kong Park               25.7 C               32.4 C
Shau Kei Wan                 27.9 C               32.7 C
Kowloon City                 27.8 C               34.3 C
Happy Valley                 27.1 C               34.3 C
Wong Tai Sin                 27.1 C               34.1 C
Stanley                      27.9 C               32.1 C
Kwun Tong                    27.8 C               33.5 C
Sham Shui Po                 28.1 C               33.3 C
Kai Tak Runway Park          27.7 C               33.3 C
Yuen Long Park               26.9 C               34.0 C
Tai Mei Tuk               27.8 C               35.1 C

Duration of sunshine (King's Park):              9.7 H
The mean UV index recorded at King's Park yesterday was 6,
the UV intensity was High.
The maximum UV index for yesterday was 12.
 

Yesterday's (31 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                           0.09
Tap Mun                             0.09
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                      0.13
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 31 Jul
     2003copy right image | Important notices | Privacy policy Last revision date: <01 Aug 2018> 

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