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Bulletin issued at 12:02 HKT 24/Aug/2019

At noon 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 5. The intensity of UV radiation was moderate.

Tropical Cyclone Bailu will move into Taiwan Strait this afternoon and edge progressively closer to the southeast coast of China. Depending on the situation, the Observatory will consider issuing the Standby Signal, No. 1 this afternoon. Please take note of the latest weather report issued by the Observatory.

Please be reminded that:

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 31 degrees;
Wong Chuk Hang 32 degrees;
Ta Kwu Ling 35 degrees;
Lau Fau Shan 32 degrees;
Tai Po 33 degrees;
Sha Tin 34 degrees;
Tuen Mun 33 degrees;
Tseung Kwan O 35 degrees;
Sai Kung 34 degrees;
Cheung Chau 33 degrees;
Chek Lap Kok 32 degrees;
Tsing Yi 32 degrees;
Shek Kong 33 degrees;
Tsuen Wan Ho Koon 31 degrees;
Tsuen Wan Shing Mun Valley 33 degrees;
Hong Kong Park 34 degrees;
Shau Kei Wan 34 degrees;
Kowloon City 34 degrees;
Happy Valley 33 degrees;
Wong Tai Sin 34 degrees;
Stanley 32 degrees;
Kwun Tong 33 degrees;
Sham Shui Po 33 degrees;
Kai Tak Runway Park 32 degrees;
Yuen Long Park 34 degrees;
Tai Mei Tuk 35 degrees.

No rainfall was recorded at the Hong Kong Observatory between midnight last night and midday today.

Here is the information on Severe Tropical Storm Bailu at noon:
Location: 21.9 degrees north, 121.1 degrees east.


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


Climatological Information for 24 Aug

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Bulletin updated at 11:45 HKT 24/Aug/2019

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

The outer subsiding air of Tropical Cyclone Bailu is bringing very hot weather to Guangdong. Locally, temperatures over many places rose to about 33 degrees around noon. Under the influence of haze, the visibility in the harbour fell to around 3000 metres.

At noon, Severe Tropical Storm Bailu was centred about 120 kilometres southeast of Gaoxiong. It is forecast to move northwest at about 28 kilometres per hour towards the vicinity of the southern part of Taiwan.

Weather forecast for this afternoon and tonight

Very hot with sunny periods and haze in the afternoon. Isolated showers and a few squally thunderstorms tonight. Moderate west to northwesterly winds, fresh offshore later.

Outlook : Windier with occasional showers and thunderstorms tomorrow. Fewer showers in the following couple of days. Very hot midweek next week.


(The above forecast period is valid up to 23:59 HKT today, 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 11:00 HKT 24/Aug/2019

STORM WARNING AREAS: TAIWAN STRAIT, BASHI AND BALINTANG.
GALE WARNING AREA: SCARBOROUGH.

GENERAL SITUATION AT 232100 UTC:
FOR DETAILS ON SEVERE TROPICAL STORM BAILU (1911) , PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 240300 UTC:

HONG KONG= W TO NW 4-5. DOWN TO 4000 M IN SOME HAZE. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS LATER.. TEMP 34-27 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 7-8, CYCLONIC UP TO 11 LATER. DOWN TO 500 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, UP TO 12M LATER. SWELL NE 3-5 M UP TO 6M LATER. =
BASHI= CYCLONIC UP TO 11, W TO SW 7-8 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 10-12 M, 4-6 M LATER. SWELL E 6M, 3-5 M IN E LATER. =
PRATAS= NW 6-7 BEC W TO SW 6-7. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E 2 M, SW 2 M. =
BALINTANG= W TO NW 9-10, SW UP TO 11. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, UP TO 12 M. SWELL E 5-6 M, 6 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 12:30 HKT 24/Aug/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 p.m. on 24 August 2019

    Warnings:
    Storm force winds in Nan'ao. Strong winds in Shanwei.

    Weather Situation:
    At noon, Severe Tropical Storm Bailu with maximum sustained winds of about 105 kilometres per hour near its centre was located at 21.9 degrees north, 121.1 degrees east. It is forecast to move northwest at about 28 kilometres per hour towards the vicinity of southern part of Taiwan.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    West to northwest force 4 to 5.
    Haze, isolated showers and thunderstorms.
    Slight to moderate seas.

    Nan'ao:
    North to northwest force 6 to 7, becoming cyclonic force 8 to 9, up to force 10 in east at first.
    Frequent squally showers and thunderstorms.
    Rough seas, becoming very rough to high.

    Shanwei:
    North to northwest force 6.
    Scattered squally showers and thunderstorms.
    Rough seas.

    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, becoming south to southeasterly winds of force 5 to 6 later. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind west force 4
      Visibility 7 Kilometres

    Shantou Wind west-northwest force 3
      Visibility 30 Kilometres

    Dongsha Wind west-northwest force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind west-northwest force 4

    Macau Wind west-northwest force 2
      Visibility 6 Kilometres

    Xisha Wind west-southwest force 2
      Visibility 30 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 09:30 HKT 24/AUG/2019
    (Next update at 12:30 HKT 24/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 WERE WEAK OVER THE COASTAL AREAS OF
     GUANGDONG.
     AT 8 A.M., SEVERE TROPICAL STORM BAILU WAS
     LOCATED AT 21.3 DEGREES ORTH, 121.9 DEGREES
     EAST. IT IS FORECAST TO MOVE NORTHWEST AT ABOUT
     15 KNOTS TOWARDS THE VICINITY OF SOUTHERN PART
     OF TAIWAN.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  320/5-10
                  BECMG 290/10
                  TEMPO VRB/15G25 IN TS.
       OFFSHORE:  320/10
                  BECMG 290/10-15                      29-35
   B.   2000 FT:  360/5-10
                  BECMG 320/15-20                      26
   C.   5000 FT:  040/15                               21
   D.  10000 FT:  030/15                               13
   E.  18000 FT:  060/20                               MS1
   F.  24000 FT:  080/25                               MS11
   G.  30000 FT:  110/15                               MS24
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      1600-2500 FT
   I. WEATHER       : 
      SUNNY PERIODS. LOCALIZED HAZE/MIST. A FEW
      SHOWERS AND ISOLATED SQUALLY THUNDERSTORMS
      LATER.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT SCT 3000 FT  TEMPO FEW CB 1000 FT
      SCT 1500 FT  BKN 5000 FT
   K. VISIBILITY    : 7 KM. TEMPO 2500 M IN SHOWERS/MIST/HAZE. 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. MOD NEAR HILLS.
   N. SEA STATE     : 0.5-1.0 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH WEST TO NORTHWESTERLIES.
     MAINLY CLOUDY. A FEW SHOWERS AND ISOLATED
     SQUALLY 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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    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

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    Bulletin issued at 12:30 HKT 24/Aug/2019


    Tropical Cyclone Warning

    At 240300 UTC, Severe Tropical Storm Bailu (1911) with central pressure 980 hectopascals was centred within 90 nautical miles of two one point eight degrees north (21.8 N) one two one point one degrees east (121.1 E) and is forecast to move northwest at about 15 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 300 nautical miles.

    Forecast position and intensity at 250300 UTC
    Two four point four degrees north (24.4 N)
    One one five point nine degrees east (115.9 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 260300 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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