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Bulletin issued at 10:02 HKT 28/Jul/2019

At 10 a.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 80 per cent.
During the past hour the mean UV Index recorded at King's Park was 2. The intensity of UV radiation was low.

Announcement on Localised Heavy Rain: Rain was particularly heavy in Lantau Island in Islands District, with more than 70 millimetres of rainfall recorded in the past 1 hour ending at 8:15 a.m. and may cause serious flooding.

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 11:30 a.m. today. Isolated thunderstorms are expected to occur over New Territories.

The air temperatures at other places were:

King's Park 28 degrees;
Wong Chuk Hang 30 degrees;
Ta Kwu Ling 27 degrees;
Lau Fau Shan 25 degrees;
Tai Po 27 degrees;
Sha Tin 28 degrees;
Tuen Mun 26 degrees;
Tseung Kwan O 30 degrees;
Sai Kung 29 degrees;
Cheung Chau 29 degrees;
Chek Lap Kok 27 degrees;
Tsing Yi 27 degrees;
Shek Kong 26 degrees;
Tsuen Wan Ho Koon 26 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 29 degrees;
Shau Kei Wan 28 degrees;
Kowloon City 29 degrees;
Happy Valley 29 degrees;
Wong Tai Sin 29 degrees;
Stanley 30 degrees;
Kwun Tong 29 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 28 degrees;
Yuen Long Park 26 degrees;
Tai Mei Tuk 30 degrees.

Between 8:45 and 9:45 a.m., lightning was detected over all regions. The rainfall recorded in various regions were:

Tai Po 0 to 42 mm;
Yuen Long 2 to 42 mm;
Tsuen Wan 0 to 31 mm;
North District 0 to 23 mm;
Sha Tin 0 to 14 mm;
Kwai Tsing 2 to 13 mm;
Tuen Mun 0 to 7 mm;
Sai Kung 0 to 3 mm;
Islands District 0 to 3 mm;
Sham Shui Po 1 to 2 mm.


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


Climatological Information for 28 Jul

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Bulletin updated at 09:45 HKT 28/Jul/2019

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

The anticyclone aloft over southern China is weakening slightly. Meanwhile, showers are affecting the northern part of the South China Sea and the coast of Guangdong.

Weather forecast for today

Mainly cloudy with a few showers. Showers will be heavier in some areas at first with isolated thunderstorms. Sunny intervals in the afternoon. Light to moderate southerly winds.

Outlook : Sunny intervals and a few showers in the next couple of days. Showers becoming more frequent midweek this week.


(The above forecast period is valid up to 23:59 HKT today, 28/07/2019; 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 28/Jul/2019

N0 WARNING.

GENERAL SITUATION AT 272100 UTC:
A SOUTHERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 280100 UTC:

HONG KONG= S TO SE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. TEMP 32-27 C. =
KWANGTUNG= S TO SE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
TAIWAN STRAIT= S TO SE 4-5, UP TO 6 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2 M, UP TO 3 M LATER. =
BASHI= SE 4-5, UP TO 6 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2 M, UP TO 3 M LATER. =
PRATAS= S TO SE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
BALINTANG= SE 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
SCARBOROUGH= S TO SE 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
PARACEL= S TO SE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
TONKIN= S 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= S 4-5. DOWN TO 4000 M IN ISOL SQUALLY 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

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    Bulletin issued at 09:30 HKT 28/Jul/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 28 July 2019

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

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South to southeast force 4 to 5.
    Isolated squally showers and thunderstorms.
    Moderate seas.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    South to southeast force 4 to 5.
    Isolated squally showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    Southeasterly winds of force 4 to 5, becoming force 6. Isolated squally showers and thunderstorms.

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

    Waglan Island Wind southwest force 2
      Visibility 50 Kilometres or above

    Shantou Wind south-southeast force 2
      Visibility 28 Kilometres

    Dongsha Wind south-southwest force 1
      Visibility 10 Kilometres

    Huangmaozhou Wind south-southwest force 3

    Macau Wind south-southwest force 1
      Visibility 27 Kilometres

    Xisha Wind southwest force 1
      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 09:30 HKT 28/JUL/2019
    (Next update at 12:30 HKT 28/JUL/2019)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A SOUTHERLY AIRSTREAM IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  180/5-10
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  190/10                               25-33
   B.   2000 FT:  190/10                               25
   C.   5000 FT:  210/10                               20
   D.  10000 FT:  110/10                               12
   E.  18000 FT:  030/25                               MS2
   F.  24000 FT:  070/15                               MS12
   G.  30000 FT:  060/25                               MS23
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY AND A FEW SHOWERS. ISOLATED
      THUNDERSTORMS. SUNNY INTERVALS IN THE AFTERNOON.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT SCT 3000 FT. TEMPO CB 1000 FT SCT
      1500 BKN 4000 FT
   K. VISIBILITY    : 10 KM. TEMPO 4000 M IN SHOWERS. TEMPO 2000 IN TS.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 11400 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS
   N. SEA STATE     : 0.5-1.0 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT TO MODERATE SOUTHEASTERLY WINDS. MAINLY
     CLOUDY AND A FEW SHOWERS. ISOLATED THUNDERSTORMS.=

    ===================================================================
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 10:10 HKT on 28 Jul 19

    VHHK SIGMET 3 VALID 280210/280610 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2207 E11259 - N2349 E11703 - N2357 E11730 - N2151 E11730 - N2053 E11238 - N2145 E11244 - N2207 E11259 TOP FL430 MOV NW 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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     2003copy right image | Important notices | Privacy policy Last revision date: <27 Jul 2019> 
    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 28/Jul/2019 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     33.3 C
Minimum Air Temperature                     29.0 C
Grass Minimum Temperature                   28.6 C
Relative Humidity                        59 - 85 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          1302.5 mm
Against an average of                     1424.8 mm

Other Stations                Min                  Max
King's Park                  28.2 C               33.0 C
Wong Chuk Hang               28.3 C               31.9 C
Ta Kwu Ling                  26.0 C               35.0 C
Lau Fau Shan                 28.0 C               33.0 C
Tai Po                       27.1 C               34.5 C
Sha Tin                      29.0 C               34.2 C
Tuen Mun                     28.7 C               33.7 C
Tseung Kwan O                27.7 C               34.8 C
Sai Kung                     28.6 C               34.9 C
Cheung Chau                  27.2 C               34.8 C
Chek Lap Kok                 29.2 C               35.1 C
Tsing Yi                     28.3 C               32.8 C
Shek Kong                    26.9 C               34.7 C
Tsuen Wan Ho Koon            26.0 C               32.2 C
Tsuen Wan Shing Mun Valley   27.7 C               33.4 C
Hong Kong Park               28.7 C               34.3 C
Shau Kei Wan                 28.7 C               34.1 C
Kowloon City                 28.4 C               34.5 C
Happy Valley                 28.7 C               35.2 C
Wong Tai Sin                 29.1 C               34.5 C
Stanley                      28.5 C               31.9 C
Kwun Tong                    28.7 C               33.5 C
Sham Shui Po                 28.2 C               33.4 C
Kai Tak Runway Park          28.8 C               34.2 C
Yuen Long Park               27.9 C               35.4 C
Tai Mei Tuk               27.4 C               36.0 C

Duration of sunshine (King's Park):              10.4 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 11.
 

Yesterday's (27 Jul 2019) 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                               0.10
Yuen Ng Fan                         0.11
Tai Mei Tuk                         0.10
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                        0.12

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 27 Jul
     2003copy right image | Important notices | Privacy policy Last revision date: <28 Jul 2019> 

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