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Bulletin issued at 05:02 HKT 25/Aug/2019

At 5 a.m. at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 83 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.

The air temperatures at other places were:

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

Here is the information on Severe Tropical Storm Bailu:
Location: 23.2 degrees north, 117.8 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 25 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 04:45 HKT 25/Aug/2019

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

Weather forecast for today

Mainly cloudy with occasional squally showers and thunderstorms. The maximum temperature will be around 31 degrees during the day. Moderate to fresh west to southwesterly winds, occasionally strong offshore. There will be swells.

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


(The above forecast period is valid up to 23:59 HKT today, 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 05:30 HKT 25/Aug/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 25 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 5 a.m., Severe Tropical Storm Bailu with maximum sustained winds of about 105 kilometres per hour near its centre was located at 23.2 degrees north, 117.8 degrees east. It is forecast to move northwest or west-northwest at about 25 kilometres per hour towards the coast of southeastern China.

    Area forecasts for the next 24 hours

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

    Nan'ao:
    Cyclonic force 8 to 9, occasionally force 10.
    Frequent heavy squally showers and thunderstorms.
    Very rough to high seas.

    Shanwei:
    West to southwest force 6 to 7, occasionally force 8.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    South of Hong Kong:
    West to southwest force 5 to 6.
    Heavy 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
    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 force 4
      Visibility 12 Kilometres

    Shantou Wind southwest force 1
      Visibility 700 Metres in rain

    Dongsha Wind north force 2
      Visibility 9 Kilometres in thunderstorms

    Huangmaozhou Wind west-southwest force 3

    Macau Wind west-northwest force 4
      Visibility 10 Kilometres

    Xisha Wind west-southwest force 3
      Visibility 30 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 01:30 HKT 25/AUG/2019
    (Next update at 9:00-9:30 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 1 A.M., SEVERE TROPICAL STORM BAILU WAS
     LOCATED AT 23.1 DEGREES NORTH, 118.0 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 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  270/10-15
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  250/15-20, OCNL 25                   27-32
   B.   2000 FT:  300/20-25                            27
   C.   5000 FT:  320/20-25                            22
   D.  10000 FT:  330/25-30                            14
   E.  18000 FT:  340/25                               MS1
   F.  24000 FT:  350/25                               MS11
   G.  30000 FT:  020/25                               MS23
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      MAINLY CLOUDY WITH OCCASIONAL 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) : 12800 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS, OFFSHORE AND  NEAR HILLS
   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 04:00 HKT on 25 Aug 19

    VHHK SIGMET 7 VALID 242000/242230 VHHH- VHHK HONG KONG FIR TC BAILU PSN N2318 E11730 CB FCST AT 2000Z WI 210NM OF TC CENTRE TOP FL520 MOV NW 14KT NC FCST AT 2230Z TC CENTRE PSN N2330 E11706=

    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 04:45 HKT 25/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 5 a.m., Severe Tropical Storm Bailu was estimated to be about 390 kilometres east-northeast of Hong Kong (near 23.2 degrees north 117.8 degrees east) and is forecast to move northwest or west-northwest at about 25 kilometres per hour towards the coast of southeastern China.

    Bailu will make landfall over the coast of southeastern China shortly. The outer rainbands of Bailu will affect Guangdong, bringing squally showers to the region today.

    After making landfall, Bailu will weaken gradually. The chance of generally strong winds in Hong Kong is low, but there will be occasional strong winds offshore.

    Unless Bailu takes on a track closer to the Pearl River Estuary, the chance of Strong Wind Signal, No. 3 is not high. The Standby Signal, No. 1 will remain in force for a period of time.

    (Precautionary Announcements with No. 1 Signal)

    1. Precautions should be taken. Windows and doors should be checked.

    2. Drains should be cleared of leaves and rubbish. People in low-lying areas should take precautions against flooding.

    3. People planning to visit Guangdong, Macau, outlying islands or remote parts of Hong Kong should note that changes in weather may affect your trips.

    4. There may be swells. You are advised to stay away from the shoreline and not to engage in water sports.

    5. Listen to radio, watch TV or browse the Hong Kong Observatory's website and mobile app for the latest information on the tropical cyclone.
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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 03:30 HKT 25/Aug/2019


    Tropical Cyclone Warning

    At 241800 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 seven point nine degrees east (117.9 E) and is forecast to move northwest or west-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 180 nautical miles.

    Forecast position and intensity at 251800 UTC
    Two five point three degrees north (25.3 N)
    One one three point five degrees east (113.5 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 261800 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 25/Aug/2019 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     33.9 C
Minimum Air Temperature                     27.7 C
Grass Minimum Temperature                   26.7 C
Relative Humidity                        60 - 87 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          1706.6 mm
Against an average of                     1836.6 mm

Other Stations                Min                  Max
King's Park                  27.1 C               33.9 C
Wong Chuk Hang               25.4 C               34.4 C
Ta Kwu Ling                  25.3 C               37.1 C
Lau Fau Shan                 26.3 C               34.7 C
Tai Po                       26.4 C               35.2 C
Sha Tin                      25.9 C               36.4 C
Tuen Mun                     26.1 C               34.5 C
Tseung Kwan O                25.5 C               34.7 C
Sai Kung                     27.0 C               36.2 C
Cheung Chau                  26.1 C               34.5 C
Chek Lap Kok                 27.7 C               35.5 C
Tsing Yi                     26.0 C               34.1 C
Shek Kong                    24.7 C               35.7 C
Tsuen Wan Ho Koon            24.8 C               33.6 C
Tsuen Wan Shing Mun Valley   24.6 C               34.8 C
Hong Kong Park               26.6 C               34.5 C
Shau Kei Wan                 26.6 C               35.2 C
Kowloon City                 27.2 C               35.5 C
Happy Valley                 26.5 C               35.6 C
Wong Tai Sin                 26.8 C               36.4 C
Stanley                      26.6 C               34.7 C
Kwun Tong                    27.7 C               35.0 C
Sham Shui Po                 26.5 C               35.2 C
Kai Tak Runway Park          27.0 C               34.4 C
Yuen Long Park               25.6 C               36.5 C
Tai Mei Tuk               26.9 C               36.0 C

Duration of sunshine (King's Park):              10.0 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 (24 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                               0.11
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.10
Sha Tau Kok                         0.10
Kwun Tong                           0.13
Sai Wan Ho                          0.10
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 24 Aug
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