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Bulletin issued at 19:21 HKT 25/Aug/2019

At 7 p.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 87 per cent.

The air temperatures at other places were:

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

Between 5:45 and 6:45 p.m., the rainfall recorded in various regions were:

North District 1 to 5 mm;
Yuen Long 2 to 5 mm;
Tuen Mun 1 to 3 mm;
Tai Po 0 to 2 mm;
Tsuen Wan 0 to 2 mm;
Sham Shui Po 0 to 1 mm;
Central & Western District 0 to 1 mm;
Sai Kung 0 to 1 mm;
Sha Tin 0 to 1 mm;
Wong Tai Sin 0 to 1 mm.

Here is the information on Tropical Depression Bailu:
Location: 24.8 degrees north, 114.7 degrees east; Maximum sustained wind near its centre: 55 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 19:25 HKT 25/Aug/2019

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

The outer rainbands of the Tropical Cyclone Bailu are affecting Guangdong.

At 7 p.m., Tropical Depression Bailu was centred about 280 kilometres north of Hong Kong. It is forecast to move west-northwest at about 20 kilometres per hour further inland.

Weather forecast for tonight and tomorrow

Cloudy with occasional showers and squally thunderstorms. Showers will ease off with sunny intervals during the day tomorrow. Temperatures will range between 26 and 31 degrees. Moderate to fresh southwesterly winds, occasionally strong on high ground at first.

Outlook : Mainly fine and becoming very hot in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 26/08/2019; 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 25/Aug/2019

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

GENERAL SITUATION AT 242100 UTC:
FOR DETAILS ON SEVERE TROPICAL STORM BAILU (1911) , PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 250100 UTC:

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


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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 19:30 HKT 25/Aug/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 25 August 2019

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

    Weather Situation:
    At 7 p.m., Tropical Depression Bailu with maximum sustained winds of about 55 kilometres per hour near its centre was located at 24.8 degrees north, 114.7 degrees east. It is forecast to move west-northwest at about 20 kilometres per hour further inland.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South to southwest force 5 to 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao:
    South to southwest force 5 to 6.
    Isolated squally showers and thunderstorms.
    Moderate to rough seas.

    Shanwei and South of Hong Kong:
    South to southwest force 5 to 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

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

    Outlook for the next 48 hours
    South to southeasterly winds of force 5 to 6. Isolated showers and thunderstorms.

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

    Waglan Island Wind southwest force 4
      Visibility 25 Kilometres

    Shantou Wind south-southeast force 2
      Visibility 20 Kilometres in rain

    Dongsha Wind southwest force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind south force 4

    Macau Wind south-southwest force 2
      Visibility 8 Kilometres

    Xisha Wind southwest force 3
      Visibility 23 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 17:55 HKT 25/AUG/2019
    (Next update at 01:30 HKT 26/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 :
     TROPICAL STORM BAILU HAS WEAKENED INTO A
     TROPICAL DEPRESSION.
     AT 6 P.M., BAILU WAS CENTRED 24.7 DEGREES NORTH,
     115.0 DEGREES EAST AND IS FORECAST TO MOVE
     WEST-NORTHWEST AT ABOUT 11 KNOTS FURTHER INLAND.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  230/10-15
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  230/15-20, OCNL 25                   28-25
   B.   2000 FT:  210/25-30                            26
   C.   5000 FT:  260/30                               21
   D.  10000 FT:  270/30                               11
   E.  18000 FT:  340/20
                  BECMG 220/25                         MS1
   F.  24000 FT:  010/20
                  BECMG 180/20                         MS10
   G.  30000 FT:  040/25
                  BECMG 150/20                         MS22
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH OCCASIONAL SQUALLY SHOWERS AND
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1800 FT SCT 4000 FT  
      TEMPO FEW CB 1000 FT SCT 1500 FT  BKN 4000 FT
   K. VISIBILITY    : 7 KM. TEMPO 3000 M IN SHOWERS. TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11200 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS, OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH SOUTHWESTERLIES, OCCASIONALLY
     STRONG OFFSHORE AND ON HIGH GROUNDS. CLOUDY WITH
     OCCASIONAL SHOWERS AND THUNDERSTORMS. SHOWERS
     WILL EASE OFF WITH SUNNY INTERVALS DURING THE
     DAY.=

    ===================================================================
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 18:31 HKT on 25 Aug 19

    VHHK SIGMET 3 VALID 251030/251430 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2055 E11130 - N2130 E11130 - N2337 E11636 - N2050 E11512 - N2004 E11315 - N2055 E11130 TOP FL430 STNR WKN=

    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 19:25 HKT 25/Aug/2019

    Tropical Cyclone Warning Bulletin

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

    All signals were cancelled at 7:20 p.m.

    At 7 p.m., Tropical Depression Bailu was centred about 280 kilometres north of Hong Kong (near 24.8 degrees north 114.7 degrees east) and is forecast to move west-northwest at about 20 kilometres per hour further inland.

    Winds in Hong Kong will still be occasionally strong on high ground at first. There will also be swells over the sea. Members of the public should remain on the alert.
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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 19:20 HKT 25/Aug/2019


    Tropical Cyclone Warning

    Tropical Storm Bailu (1911) has weakened into a Tropical Depression with central pressure 998 hectopascals. At 250900 UTC, it was centred within 60 nautical miles of two four point seven degrees north (24.7 N) one one five point one degrees east (115.1 E) and is forecast to weaken further and move west-northwest at about 10 knots for the next 12 hours.

    Maximum winds near the centre are estimated to be 30 knots.

    Radius of over 2 metre waves 150 nautical miles over southeast quadrant, 90 nautical miles elsewhere.

    Forecast position and intensity at 252100 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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