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Bulletin issued at 22:02 HKT 24/Aug/2019

At 10 p.m. at the Hong Kong Observatory the air temperature was 33 degrees Celsius and the relative humidity 70 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.
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 32 degrees;
Wong Chuk Hang 31 degrees;
Ta Kwu Ling 31 degrees;
Lau Fau Shan 33 degrees;
Tai Po 33 degrees;
Sha Tin 33 degrees;
Tuen Mun 32 degrees;
Tseung Kwan O 31 degrees;
Sai Kung 34 degrees;
Cheung Chau 30 degrees;
Chek Lap Kok 34 degrees;
Tsing Yi 30 degrees;
Shek Kong 30 degrees;
Tsuen Wan Ho Koon 31 degrees;
Tsuen Wan Shing Mun Valley 30 degrees;
Hong Kong Park 32 degrees;
Shau Kei Wan 33 degrees;
Kowloon City 32 degrees;
Happy Valley 33 degrees;
Wong Tai Sin 32 degrees;
Stanley 31 degrees;
Kwun Tong 32 degrees;
Sham Shui Po 31 degrees;
Kai Tak Runway Park 33 degrees;
Yuen Long Park 33 degrees;
Tai Mei Tuk 33 degrees.

Here is the information on Severe Tropical Storm Bailu:
Location: 23.2 degrees north, 118.8 degrees east; Maximum sustained wind near its centre: 105 km/h.


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


Climatological Information for 24 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 21:45 HKT 24/Aug/2019

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

Weather forecast for tonight and tomorrow

Very hot at first. Mainly cloudy with occasional squally showers and thunderstorms. Temperatures will range between 27 and 31 degrees tomorrow. Moderate to fresh west to southwesterly winds, occasionally strong offshore tomorrow. There will be swells.

Outlook : Still a few showers on Monday. Very hot in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 25/08/2019; 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 21:00 HKT 24/Aug/2019

STORM WARNING AREAS: TAIWAN STRAIT, BASHI AND BALINTANG.
GALE WARNING AREAS: KWANGTUNG AND PRATAS.

GENERAL SITUATION AT 240900 UTC:
FOR DETAILS ON SEVERE TROPICAL STORM BAILU (1911) , PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 241300 UTC:

HONG KONG= W TO SW 4-5, BEC 6. DOWN TO 2000 M IN SQUALLY SHOWERS AND TS. SEA 2 M, BEC 3 M. SWELL E 2 M, SW 2 M. TEMP 27-31 C. =
KWANGTUNG= W TO SW 6-7, NW 8 IN E AT FIRST. DOWN TO 2000 M IN SQUALLY SHOWERS AND TS. SEA 3-4 M, 6 M IN E AT FIRST. SWELL E 2 M, SW 2 M. =
TAIWAN STRAIT= CYCLONIC 10, BEC S 8-9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 10 M, BEC 6-8 M. SWELL NE 3-5 M. =
BASHI= S 9-10, BEC S 7-8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 8-10 M, BEC 4-6 M. SWELL SW 3-5 M. =
PRATAS= NW 7-8, BEC SW 6-7. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, BEC 3-4 M. SWELL SW 3 M. =
BALINTANG= S 9-10, BEC S 7-8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 8-10 M, BEC 4-6 M. SWELL SW 3-5 M. =
SCARBOROUGH= SW 6-7. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 3 M. =
PARACEL= W TO SW 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 3 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.


  • Map showing the 10 forecast areas
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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 20:30 HKT 24/Aug/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 8:30 p.m. on 24 August 2019

    Warnings:
    Storm force winds in Nan'ao. Gale force winds in Shanwei. Strong winds in Hong Kong adjacent waters and south of Hong Kong.

    Weather Situation:
    At 8 p.m., Severe Tropical Storm Bailu with maximum sustained winds of about 105 kilometres per hour near its centre was located at 23.0 degrees north, 119.4 degrees east, it is forecast to move northwest at about 25 kilometres per hour crossing the Taiwan Strait.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    West to southwest force 4 to 5, becoming force 6.
    Squally showers and thunderstorms.
    Moderate seas, becoming rough.

    Nan'ao:
    Northwest force 7 to 8, becoming cyclonic force 9 to 10.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas, becoming high.

    Shanwei:
    West to northwest force 6 to 7, becoming force 8.
    Squally showers and thunderstorms.
    Rough seas, becoming very rough.

    South of Hong Kong:
    West to southwest force 5 to 6.
    Squally showers and thunderstorms.
    Moderate to rough seas.

    Shangchuan Dao:
    West to southwest force 4 to 5.
    Scattered squally showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    West to southwesterly winds of force 6 to 7, becoming south to southeasterly winds of force 5 to 6 later. Heavy squally showers and thunderstorms.

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

    Waglan Island Wind west-southwest force 5
      Visibility 11 Kilometres

    Shantou Wind west-southwest force 1
      Visibility 30 Kilometres

    Dongsha Wind west-southwest force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind west force 6

    Macau Wind west force 2
      Visibility 9 Kilometres

    Xisha Wind west-southwest force 2
      Visibility 25 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
  • Descriptive Terms of Wind Speeds
  • Visibility Readings in Hong Kong Waters
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 24/AUG/2019
    (Next update at 01:30 HKT 25/AUG/2019)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB. 
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 5 P.M., SEVERE TROPICAL STORM BAILU WAS
     LOCATED AT 22.5 DEGREES NORTH, 120.3 DEGREES
     EAST. IT IS FORECAST TO MOVE NORTHWEST AT ABOUT
     14 KNOTS, CROSSING THE TAIWAN STRAIT.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  290/10
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  250/15-20                            36-27
   B.   2000 FT:  320/20, OCNL 25                      26
   C.   5000 FT:  350/20, OCNL 25                      21
   D.  10000 FT:  010/25                               13
   E.  18000 FT:  020/25                               MS1
   F.  24000 FT:  030/25                               MS11
   G.  30000 FT:  030/20, OCNL 25                      MS24
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      1600-2500 FT
   I. WEATHER       : 
      MAINLY CLOUDY. ISOLATED SQUALLY SHOWERS AND
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT SCT 3000 FT  
      TEMPO FEW CB 1000 FT SCT 1500 FT  BKN 4000 FT
   K. VISIBILITY    : 8 KM. TEMPO 3000 M IN SHOWERS. 
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 12400 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS AND  NEAR HILLS. 
                      MOD OFFSHORE.
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH WEST TO SOUTHWESTERLIES,
     OCCASIONALLY STRONG OFFSHORE. MAINLY CLOUDY WITH
     SQUALLY 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.

    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 21:41 HKT on 24 Aug 19

    VHHK SIGMET 3 VALID 241340/241740 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1825 E11524 - N2034 E11339 - N2228 E11350 - N2356 E11721 - N2358 E11730 - N2100 E11730 TOP FL520 MOV WNW 10KT NC=

    Please click here for more about the SIGMET

    TROPICAL CYCLONE WARNING Skip to main content
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    Tropical Cyclone Warnings

    Bulletin issued at 21:45 HKT 24/Aug/2019

    Tropical Cyclone Warning Bulletin

    Here is the latest Tropical Cyclone Warning Bulletin issued by the Hong Kong Observatory.

    The Standby Signal, No. 1 is in force.

    This means that a tropical cyclone now centred within about 800 kilometres of Hong Kong may affect us.

    At 10 p.m., Severe Tropical Storm Bailu was estimated to be about 490 kilometres east-northeast of Hong Kong (near 23.2 degrees north 118.8 degrees east) and is forecast to move northwest at about 25 kilometres per hour crossing the Taiwan Strait.
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    TROPICAL CYCLONE WARNING FOR SHIPPING
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    Tropical Cyclone Warning for Shipping

    Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
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    Severe Weather Information Centre

    Bulletin issued at 21:30 HKT 24/Aug/2019


    Tropical Cyclone Warning

    At 241200 UTC, Severe Tropical Storm Bailu (1911) with central pressure 980 hectopascals was centred within 90 nautical miles of two three point one degrees north (23.1 N) one one nine point three degrees east (119.3 E) and is forecast to move northwest at about 14 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 55 knots.

    Radius of over 33 knot winds 120 nautical miles.
    Radius of over 47 knot winds 60 nautical miles.
    Radius of over 2 metre waves 240 nautical miles.

    Forecast position and intensity at 251200 UTC
    Two four point eight degrees north (24.8 N)
    One one four point five degrees east (114.5 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 261200 UTC
    Dissipated over land.



    The Hong Kong Observatory's tropical cyclone warnings for shipping are issued about one and a half hours after the time of observation. They incorporate additional information derived from surface and upper-air data and may therefore be slightly different from the real-time satellite or radar-based positions given in the hourly bulletins for public.

    While the forecast positions and track indicate the most likely future path of the tropical cyclone, they may deviate from the actual path taken by the storm.

    Tropical Cyclone Track
    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 24/Aug/2019 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.4 C
Minimum Air Temperature                     28.2 C
Grass Minimum Temperature                   27.4 C
Relative Humidity                        72 - 87 Percent
Rainfall                                     0.7 mm 
Total rainfall since 1st January          1706.6 mm
Against an average of                     1812.9 mm

Other Stations                Min                  Max
King's Park                  27.7 C               31.0 C
Wong Chuk Hang               26.3 C               30.7 C
Ta Kwu Ling                  26.2 C               32.4 C
Lau Fau Shan                 26.2 C               31.6 C
Tai Po                       27.1 C               32.3 C
Sha Tin                      27.2 C               33.0 C
Tuen Mun                     26.5 C               30.2 C
Tseung Kwan O                26.1 C               32.8 C
Sai Kung                     27.3 C               33.7 C
Cheung Chau                  26.2 C               33.5 C
Chek Lap Kok                 26.8 C               32.3 C
Tsing Yi                     26.7 C               31.7 C
Shek Kong                    25.7 C               32.4 C
Tsuen Wan Ho Koon            24.9 C               29.4 C
Tsuen Wan Shing Mun Valley   25.3 C               32.2 C
Hong Kong Park               27.1 C               31.5 C
Shau Kei Wan                 26.9 C               31.9 C
Kowloon City                 27.6 C               31.6 C
Happy Valley                 27.4 C               31.9 C
Wong Tai Sin                 27.7 C               32.4 C
Stanley                      27.0 C               32.8 C
Kwun Tong                    27.5 C               32.6 C
Sham Shui Po                 27.8 C               32.2 C
Kai Tak Runway Park          26.9 C               31.3 C
Yuen Long Park               26.4 C               32.8 C
Tai Mei Tuk               27.1 C               34.3 C

Duration of sunshine (King's Park):              3.8 H
The mean UV index recorded at King's Park yesterday was 3,
the UV intensity was Moderate.
The maximum UV index for yesterday was 9.
 

Yesterday's (23 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                         0.10
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                        0.14

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 23 Aug
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