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Bulletin issued at 16:02 HKT 23/Aug/2019

At 4 p.m. at the Hong Kong Observatory the air temperature was 31 degrees Celsius and the relative humidity 74 per cent.
During the past hour the mean UV Index recorded at King's Park was 2. The intensity of UV radiation was low.

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 5:00 p.m. today. Isolated thunderstorms are expected to occur over New Territories.
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 29 degrees;
Lau Fau Shan 30 degrees;
Tai Po 30 degrees;
Sha Tin 32 degrees;
Tuen Mun 30 degrees;
Tseung Kwan O 31 degrees;
Sai Kung 32 degrees;
Cheung Chau 32 degrees;
Chek Lap Kok 31 degrees;
Tsing Yi 29 degrees;
Shek Kong 31 degrees;
Tsuen Wan Ho Koon 29 degrees;
Tsuen Wan Shing Mun Valley 30 degrees;
Hong Kong Park 30 degrees;
Shau Kei Wan 30 degrees;
Kowloon City 31 degrees;
Happy Valley 31 degrees;
Wong Tai Sin 31 degrees;
Stanley 32 degrees;
Kwun Tong 31 degrees;
Sham Shui Po 30 degrees;
Kai Tak Runway Park 30 degrees;
Yuen Long Park 32 degrees;
Tai Mei Tuk 32 degrees.

Between 2:45 and 3:45 p.m., lightning was detected within New Territories East and New Territories West. The rainfall recorded in various regions were:

North District 0 to 18 mm;
Yuen Long 0 to 3 mm;
Islands District 0 to 1 mm.


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


Climatological Information for 23 Aug

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 16:15 HKT 23/Aug/2019

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

Winds are weak over the coastal areas of Guangdong. Meanwhile, thundery showers triggered by high temperatures are affecting Guangdong.

At 4 p.m., Severe Tropical Storm Bailu was centred about 620 kilometres southeast of Gaoxiong. It is forecast to move northwest at about 28 kilometres per hour across the western North Pacific towards the vicinity of the southern part of Taiwan.

Weather forecast for tonight and tomorrow

A few showers. There will be isolated squally thunderstorms at first and later tomorrow. The minimum temperature will be about 28 degrees. Very hot with sunny periods and haze during the day. The maximum temperature will be around 34 degrees in the urban areas, and a couple of degrees higher in the New Territories. Light winds, becoming moderate west to northwesterlies later tomorrow.

Outlook : Windier with occasional showers and thunderstorms on Sunday. Weather will improve with less showers in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 24/08/2019; 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 23/Aug/2019

HURRICANE WARNING AREAS: BASHI AND BALINTANG.
GALE WARNING AREAS: TAIWAN STRAIT AND SCARBOROUGH.

GENERAL SITUATION AT 220900 UTC:
SEVERE TROPICAL STORM BAILU (1911) 984 HPA 17N 127E NW 14KT INTSF.

MARINE FORECAST FOR 24 HOURS FROM 230100 UTC:

HONG KONG= SE 3-4, NW 4 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. DOWN TO 4000 M IN SOME HAZE. TEMP 33-29 C. =
KWANGTUNG= NW 4-5, 6 IN E LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2 M, 3 M IN E LATER. SWELL E 2 M, S TO SW 2 M. =
TAIWAN STRAIT= N TO NE 5-6, BEC 7-8. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M, 4-6 M LATER. SWELL NE 2 M. =
BASHI= W TO NW 7-8, CYCLONIC UP TO 12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, UP TO 14 M LATER. SWELL E 3-5 M, 7 M IN E. =
PRATAS= NW 4-5, BEC 6-7. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 2 M, 3-4 M LATER. SWELL E 2 M, SW 2 M. =
BALINTANG= W TO NW 7-8, SW UP TO 12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, UP TO 14 M LATER. SWELL E 3-5 M, 7 M IN E. =
SCARBOROUGH= W TO SW 6-7, OCNL 8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL NE 2 M, SW 2 M. =
PARACEL= W TO SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SW 2 M. =
TONKIN= W TO SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= W TO SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 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 16:30 HKT 23/Aug/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 23 August 2019

    Warnings:
    Strong winds in Nan'ao and Shanwei.

    Weather Situation:
    At 4 p.m., Severe Tropical Storm Bailu with maximum sustained winds of about 90 kilometres per hour near its centre was located at 19.4 degrees north, 125.2 degrees east. It is forecast to move northwest at about 28 kilometres per hour across the western North Pacific towards the vicinity of the southern part of Taiwan.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North to northwest force 3 to 4.
    Isolated squally showers and thunderstorms, some haze.
    Slight to moderate seas.

    Nan'ao:
    North to northwest force 4 to 5, becoming force 6 to 7 later.
    Scattered squally showers and thunderstorms.
    Moderate seas, becoming rough later.

    Shanwei:
    North to northwest force 4 to 5, becoming force 6 later.
    Scattered squally showers and thunderstorms.
    Moderate seas, becoming rough later.

    South of Hong Kong and Shangchuan Dao:
    West to northwest force 4 to 5.
    Isolated squally showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    West to southwesterly winds of force 5 to 6, cyclonic winds of up to force 10 in east at first. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind east force 1
      Visibility 34 Kilometres

    Shantou Wind south-southeast force 2
      Visibility 30 Kilometres

    Dongsha Wind east-northeast force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind east-northeast force 3

    Macau Wind east-southeast force 1
      Visibility 20 Kilometres

    Xisha Wind west-southwest force 2
      Visibility 29 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 12:30 HKT 23/AUG/2019
    (Next update at 17:30 HKT 23/AUG/2019)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     WINDS ARE WEAK OVER THE COASTAL AREAS OF
     GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1300 TO 2300 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  VRB/5-10
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  150/10                               33-28
   B.   2000 FT:  070/10                               24
   C.   5000 FT:  050/15                               19
   D.  10000 FT:  060/15                               11
   E.  18000 FT:  080/20                               MS1
   F.  24000 FT:  090/20                               MS13
   G.  30000 FT:  080/30                               MS23
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH ISOLATED SHOWERS AND
      THUNDERSTORMS. SUNNY PERIODS IN THE AFTERNOON.
      LOCALISED HAZE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT SCT 2500 FT.
      TEMPO FEW CB 1000 FT SCT 2500 FT BKN 4000 FT
   K. VISIBILITY    : 10 KM. TEMPO 4000 M IN SHOWERS/HAZE. TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 10800 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS.
   N. SEA STATE     : 0.5-1.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT WINDS. CLOUDY PERIODS WITH ISOLATED
     SHOWERS AND 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.

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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

    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/Aug/2019 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     33.0 C
Minimum Air Temperature                     27.5 C
Grass Minimum Temperature                   26.7 C
Relative Humidity                        66 - 88 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          1705.9 mm
Against an average of                     1800.0 mm

Other Stations                Min                  Max
King's Park                  26.7 C               32.6 C
Wong Chuk Hang               25.0 C               31.5 C
Ta Kwu Ling                  25.3 C               34.8 C
Lau Fau Shan                 25.5 C               32.3 C
Tai Po                       25.6 C               32.2 C
Sha Tin                      25.7 C               33.3 C
Tuen Mun                     26.4 C               33.1 C
Tseung Kwan O                25.3 C               32.2 C
Sai Kung                     26.6 C               33.2 C
Chek Lap Kok                 27.3 C               34.0 C
Tsing Yi                     25.9 C               32.4 C
Shek Kong                    24.6 C               34.2 C
Tsuen Wan Ho Koon            24.0 C               30.5 C
Tsuen Wan Shing Mun Valley   24.5 C               32.3 C
Hong Kong Park               26.2 C               32.8 C
Shau Kei Wan                 25.9 C               31.1 C
Kowloon City                 26.6 C               33.4 C
Happy Valley                 26.3 C               33.0 C
Wong Tai Sin                 26.4 C               33.2 C
Stanley                      26.2 C               31.7 C
Kwun Tong                    26.6 C               32.6 C
Sham Shui Po                 26.6 C               33.4 C
Kai Tak Runway Park          26.1 C               31.3 C
Yuen Long Park               25.7 C               33.7 C
Tai Mei Tuk               26.3 C               34.1 C

Duration of sunshine (King's Park):              9.4 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 8.
 

Yesterday's (22 Aug 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                               0.10
Yuen Ng Fan                         0.11
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 Aug
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