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Bulletin issued at 11:02 HKT 22/Jul/2018

At 11 a.m. at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 74 per cent.
During the past hour the mean UV Index recorded at King's Park was 7. The intensity of UV radiation was high.

According to the present forecast track, a tropical depression will linger in the vicinity of Beibu Wan and the coast of western Hainan Island today. It will maintain a distance of more than 600 kilometres from Hong Kong. It will not pose direct threat to Hong Kong for the time being. The Observatory will closely monitor the evolution of the tropical depression.

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 30 degrees;
Ta Kwu Ling 32 degrees;
Lau Fau Shan 30 degrees;
Tai Po 32 degrees;
Sha Tin 32 degrees;
Tuen Mun 32 degrees;
Tseung Kwan O 33 degrees;
Sai Kung 32 degrees;
Cheung Chau 30 degrees;
Chek Lap Kok 31 degrees;
Tsing Yi 31 degrees;
Shek Kong 33 degrees;
Tsuen Wan Ho Koon 29 degrees;
Tsuen Wan Shing Mun Valley 31 degrees;
Hong Kong Park 32 degrees;
Shau Kei Wan 32 degrees;
Kowloon City 32 degrees;
Happy Valley 32 degrees;
Wong Tai Sin 32 degrees;
Stanley 29 degrees;
Kwun Tong 32 degrees;
Sham Shui Po 31 degrees;
Kai Tak Runway Park 32 degrees;
Yuen Long Park 32 degrees;
Tai Mei Tuk 34 degrees.

Here is the information on Tropical Depression at 10 a.m.:
Location: 21.5 degrees north, 123.0 degrees east.

Here is the information on Tropical Depression at 10 a.m.:
Location: 19.3 degrees north, 107.8 degrees east.


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


Climatological Information for 22 Jul

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 10:45 HKT 22/Jul/2018

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

The weather is generally fine over southeastern China.

At 10 a.m., the tropical depression over Beibu Wan was centred about 280 kilometres west-southwest of Haikou. It is forecast to move east slowly and linger in the vicinity of Beibu Wan and the coast of western Hainan Island. Meanwhile, the tropical depression over Luzon Strait was centred about 420 kilometres south-southeast of Taibei. It is forecast to move north-northeast at about 25 kilometres per hour towards the seas east of Taiwan. Severe Tropical Storm Ampil was centred about 140 kilometres east of Shanghai. It is forecast to move northwest at about 30 kilometres per hour across the East China Sea towards the vicinity of Zhejiang to Jiangsu.

Weather forecast for today

Mainly fine and very hot apart from isolated showers. Light winds.

Outlook : More showers in the next couple of days.


(The above forecast period is valid up to 23:59 HKT today, 22/07/2018; 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 22/Jul/2018

N0 WARNING.

GENERAL SITUATION AT 212100 UTC:
FOR DETAILS ON THE TROPICAL DEPRESSION OVER LUZON STRAIT, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS. FOR DETAILS ON THE TROPICAL DEPRESSION OVER GULF OF TONKIN, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 220100 UTC:

HONG KONG= S TO SW 3-4. ISOL SHOWERS. TEMP 33-27 C. =
KWANGTUNG= S TO SW 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL SW 2 M. =
TAIWAN STRAIT= W TO NW 4-5, BEC SW 5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
BASHI= CYCLONIC 6-7, W TO SW 6 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 2-3 M. =
PRATAS= W TO SW 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 2 M. =
BALINTANG= W TO SW 5-6, 7 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 2-4 M. SWELL SW 2-3 M. =
SCARBOROUGH= SW 5-6, OCNL 7 AT FIRST. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 2-4 M. SWELL SW 2 M. =
PARACEL= S 5-6. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS IN N. SEA 2-3 M. SWELL SW 2-3 M. =
TONKIN= CYCLONIC 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. =
DANANG= S TO SW 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-4 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 10:00 HKT 22/Jul/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 10:00 a.m. on 22 July 2018

    Weather Situation:
    At 10 a.m., the tropical depression over Beibu Wan with maximum sustained winds of about 55 kilometres per hour near its centre was located near 19.3 degrees north, 107.8 degrees east. It is forecast to move east slowly and linger in the vicinity of Beibu Wan and the coast of western Hainan Island. Meanwhile, the tropical depression over Luzon Strait with maximum sustained winds of about 55 kilometres per hour near its centre was located near 21.5 degrees north, 123.0 degrees east. It is forecast to move north-northeast at about 25 kilometres per hour towards the seas east of Taiwan.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South to southwest force 3 to 4.
    Isolated showers.
    Slight to moderate seas.

    Nan'ao and Shanwei:
    West to southwest force 4 to 5.
    Moderate seas.

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

    Outlook for the next 48 hours
    South to southwesterly winds of force 5 to 6, occasionally force 7. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind southwest force 3
      Visibility 36 Kilometres

    Shantou Wind west-southwest force 2
      Visibility 20 Kilometres

    Dongsha Wind west-southwest force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind south force 2

    Macau Wind south-southwest force 1
      Visibility 30 Kilometres

    Xisha Wind south-southwest force 4
      Visibility 9 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 09:30 HKT 22/JUL/2018
    (Next update at 12:30 HKT 22/JUL/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 9 A.M., THE TROPICAL DEPRESSION OVER BEIBU
     WAN WAS CENTRED NEAR 19.3 DEGREES NORTH, 107.6
     DEGREES EAST. IT IS FORECAST TO MOVE EAST SLOWLY
     AND LINGER OVER THE VICINITY OF BEIBU WAN.
     MEANWHILE, THE TROPICAL DEPRESSION OVER LUZON
     STRAIT WAS CENTRED NEAR 21.4 DEGREES NORTH,
     122.9 DEGREES EAST. IT IS FORECAST TO MOVE
     NORTH-NORTHEAST AT ABOUT 14 KNOTS TOWARDS THE
     SEAS EAST OF TAIWAN.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  200/5-10
                  TEMPO VRB/15G25 IN TS                30-34
   B.   2000 FT:  240/10                               24
   C.   5000 FT:  210/10                               20
   D.  10000 FT:  190/15-20                            11
   E.  18000 FT:  150/10                               MS1
   F.  24000 FT:  180/10                               MS12
   G.  30000 FT:  270/10                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE. ISOLATED SHOWERS AND A FEW
      THUNDERSTORMS OVER INLAND IN THE AFTERNOON.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT.  
      TEMPO FEW CB 1000 FT  SCT 2500 FT  BKN 4000 FT.
   K. VISIBILITY    : 10 KM.  TEMPO 4000 M IN SHOWERS. 
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS
   N. SEA STATE     : 0.5-1.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTHERLY WINDS.  MAINLY CLOUDY AND
     ISOLATED 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.

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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 10:27 HKT on 22 Jul 18

    VHHK SIGMET 1 VALID 220230/220630 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1900 E11348 - N1824 E11230 - N1930 E11130 - N2124 E11130 - N2136 E11324 - N1900 E1134 TOP FL500 MOV N 10KT NC= VHHK SIGMET 2 VALID 220230/220630 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1900 E11348 - N1824 E11230 - N1930 E11130 - N2124 E11130 - N2136 E11324 - N1900 E11348 TOP FL500 MOV N 10KT NC=

    Please click here for more about the SIGMET

    Tropical Cyclone Warning
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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

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    Severe Weather Information Centre

    Bulletin issued at 09:31 HKT 22/Jul/2018


    Tropical Cyclone Warning

    At 220000 UTC, the tropical depression over Gulf of Tonkin with central pressure 996 hectopascals was centred within 60 nautical miles of one nine point three degrees north (19.3 N) one zero seven point seven degrees east (107.7 E) and is forecast to move east slowly for the next 24 hours.

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

    Radius of over 2 metre waves 90 nautical miles.

    Forecast position and intensity at 230000 UTC
    Two zero point two degrees north (20.2 N)
    One zero nine point three degrees east (109.3 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 240000 UTC
    Two one point seven degrees north (21.7 N)
    One zero nine point four degrees east (109.4 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 250000 UTC
    Dissipated over land.

    Bulletin issued at 09:30 HKT 22/Jul/2018


    Tropical Cyclone Warning

    At 220000 UTC, the tropical depression over Luzon Strait with central pressure 996 hectopascals was centred within 60 nautical miles of two one point zero degrees north (21.0 N) one two two point seven degrees east (122.7 E) and is forecast to move north-northeast at about 14 knots for the next 24 hours.

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

    Radius of over 2 metre waves 120 nautical miles over southern semicircle, 60 nautical miles elsewhere.

    Forecast position and intensity at 230000 UTC
    Two five point zero degrees north (25.0 N)
    One two three point seven degrees east (123.7 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 240000 UTC
    Dissipated over sea.



    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 22/Jul/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     33.1 C
Minimum Air Temperature                     27.4 C
Grass Minimum Temperature                   26.2 C
Relative Humidity                        59 - 88 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January           934.3 mm
Against an average of                     1347.0 mm

Other Stations                Min                  Max
King's Park                  26.6 C               32.6 C
Wong Chuk Hang               25.4 C               31.2 C
Ta Kwu Ling                  25.1 C               34.0 C
Lau Fau Shan                 25.7 C               32.2 C
Tai Po                       26.1 C               32.6 C
Sha Tin                      26.1 C               34.0 C
Tuen Mun                     25.9 C               32.3 C
Tseung Kwan O                25.5 C               33.7 C
Sai Kung                     26.5 C               33.2 C
Cheung Chau                  25.7 C               31.9 C
Chek Lap Kok                 26.7 C               33.8 C
Tsing Yi                     26.1 C               32.5 C
Shek Kong                    25.2 C               34.6 C
Tsuen Wan Ho Koon            24.5 C               30.8 C
Tsuen Wan Shing Mun Valley   24.9 C               32.8 C
Hong Kong Park               26.1 C               33.6 C
Shau Kei Wan                 26.3 C               32.3 C
Kowloon City                 26.7 C               33.3 C
Happy Valley                 26.0 C               33.6 C
Wong Tai Sin                 26.1 C               33.7 C
Stanley                      26.2 C               32.1 C
Kwun Tong                    26.5 C               33.0 C
Sham Shui Po                 26.8 C               33.3 C
Kai Tak Runway Park          27.1 C               32.1 C
Yuen Long Park               25.0 C               34.5 C
Tai Mei Tuk               26.3 C               33.7 C

Duration of sunshine (King's Park):              8.0 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 9.
 

Yesterday's (21 Jul 2018) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 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                             0.08
Kat O                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.11
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.08
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 21 Jul
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