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Bulletin issued at 21:26 HKT 30/Jul/2019

At 9 p.m. at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 82 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 3 has been issued.
The Thunderstorm Warning was issued at 9:25 p.m. It will remain effective until 11:00 p.m. today. Isolated squally thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

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

Between 7:45 and 8:45 p.m., the rainfall recorded in various regions were:

Central & Western District 0 to 3 mm;
Southern District 0 to 3 mm;
Wan Chai 0 to 2 mm;
Eastern District 0 to 1 mm;
Islands District 0 to 1 mm.

Here is the information on Tropical Depression:
Location: 17.8 degrees north, 114.4 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 30 Jul

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 21:15 HKT 30/Jul/2019

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

Weather forecast for tonight and tomorrow

Strong east to southeasterly winds, occasional gales offshore and on high ground. Cloudy with occasional squally showers and thunderstorms. Showers will be heavy at times tomorrow. Temperatures will range between 26 and 29 degrees. Seas will be rough with swells.

Outlook : Heavy squally showers and thunderstorms with high winds and rough seas in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 31/07/2019; 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 30/Jul/2019

GALE WARNING AREAS: HONG KONG, KWANGTUNG, PRATAS AND PARACEL.

GENERAL SITUATION AT 300900 UTC:
FOR DETAILS ON TROPICAL DEPRESSION OVER NORTHERN PART OF THE SOUTH CHINA SEA, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 301300 UTC:

HONG KONG= E TO SE 6-7, OCNL 8. DOWN TO 1000 M IN HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL SW UP TO 2 M. TEMP 26-29 C. =
KWANGTUNG= E TO SE 6-7, OCNL 8, CYCLONIC 7-8 IN WEST LATER. DOWN TO 1000 M IN HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL SW 2 M. =
TAIWAN STRAIT= SE 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. =
BASHI= SE 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL SW 2 M. =
PRATAS= SE 6-7, OCNL 8. DOWN TO 1000 M IN HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL SW 3-4 M. =
BALINTANG= SE 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL SW 3 M. =
SCARBOROUGH= S 6-7. DOWN TO 1000 M IN HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 3 M. =
PARACEL= CYCLONIC 6-7, S TO SE 7-8 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, 6 M LATER. SWELL SW 3-4 M. =
TONKIN= NE 4-5, NW 5-6 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M, 3 M LATER. =
DANANG= W TO NW 5-6, 7 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M, 4 M LATER. SWELL SW 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
  • Tidal Information

    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 21:30 HKT 30/Jul/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 p.m. on 30 July 2019

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

    Weather Situation:
    At 9 p.m., the tropical depression over the northern part of the South Chin Sea with maximum sustained winds of about 55 kilometres per hour near its centre was located at 17.8 degrees north, 114.4 degrees east. It is forecast to move northwest at about 12 kilometres per hour towards the vicinity of western Guangdong.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to southeast force 6 to 7, occasionally force 8.
    Heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Nan'ao:
    East to southeast force 6 to 7.
    Scattered heavy squally showers and thunderstorms.
    Rough seas.

    Shanwei:
    East to southeast force 6 to 7, occasionally force 8.
    Scattered heavy squally showers and thunderstorms.
    Rough to very rough seas.

    South of Hong Kong:
    East to southeast force 7 to 8.
    Heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Shangchuan Dao:
    Northeast force 6 to 7, becoming cyclonic force 7 to 8.
    Frequent heavy squally showers and thunderstorms.
    Rough seas, becoming very rough later.

    Outlook for the next 48 hours
    Southeasterly winds of force 6 to 7, force 8 at first. Heavy squally showers and thunderstorms.

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

    Waglan Island Wind east-northeast force 6
      Visibility 16 Kilometres

    Shantou Wind east-southeast force 2
      Visibility 30 Kilometres

    Dongsha Wind east-southeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 7

    Macau Wind east-northeast force 4
      Visibility 22 Kilometres

    Xisha Wind west force 4
      Visibility 15 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
  • Descriptive Terms of Wind Speeds
  • Visibility Readings in Hong Kong Waters
  • Map showing forecast areas
  • Tidal Information

    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 30/JUL/2019
    (Next update at 01:30 HKT 31/JUL/2019)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS, SEV TURB AND SEV GUSTS. 
     CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 5 P.M., THE TROPICAL DEPRESSION OVER THE
     NORTHERN PART OF THE SOUTH CHINA SEA WAS CENTRED
     NEAR 17.9 DEGREES NORTH 114.6 DEGREES EAST AND
     IS FORECAST TO MOVE NORTHWEST AT
     ABOUT 8 KNOTS TOWARDS THE VICINITY OF WESTERN
     GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  090/20 OCNL 25
                  TEMPO VRB/25G35 IN TS
       OFFSHORE:  090/25-30                            30-26
   B.   2000 FT:  100/30-35G45                         24
   C.   5000 FT:  100/35-40                            19
   D.  10000 FT:  110/40                               13
   E.  18000 FT:  110/35                               MS1
   F.  24000 FT:  090/35                               MS11
   G.  30000 FT:  080/35                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH SQUALLY SHOWERS AND THUNDERSTORMS.
      SHOWERS WILL BE HEAVY AT TIMES.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1200 FT SCT 2500 FT. 
      TEMPO FEW CB 800 FT SCT 1500 FT BKN 4000 FT
   K. VISIBILITY    : 9 KM. TEMPO 3000 M IN SHOWERS. 
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 12000 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 4.0-5.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     FRESH TO STRONG EAST TO SOUTHEASTERLY WINDS,
     STRONG OFFSHORE AND ON HIGH GROUND. CLOUDY WITH
     SQUALLY SHOWERS AND THUNDERSTORMS. SHOWERS WILL
     BE HEAVY AT TIMES.=

    ===================================================================
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 20:06 HKT on 30 Jul 19

    VHHK SIGMET 3 VALID 301205/301605 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1853 E11547 - N1642 E11400 - N1930 E11130 - N2130 E11130 - N2331 E11619 - N2046 E11338 - N1853 E11547 TOP FL490 MOV NW 10KT INTSF=

    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 21:20 HKT 30/Jul/2019

    Tropical Cyclone Warning Bulletin

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

    The Strong Wind Signal, No. 3 is in force.

    This means that winds with mean speeds of 41 to 62 kilometres per hour are expected.

    At 9 p.m., the tropical depression over the northern part of the South China Sea was estimated to be about 500 kilometres south of Hong Kong (near 17.8 degrees north 114.4 degrees east) and is forecast to move northwest at about 12 kilometres per hour towards the vicinity of western Guangdong.

    According to the present forecast track, the tropical depression will maintain a distance of over 300 kilometres from Hong Kong tonight and tomorrow morning. Unless the tropical depression intensifies significantly or adopts a more northerly track, local winds will not strengthen significantly early tomorrow. The Strong Wind, Signal No. 3 is expected to remain in force before dawn tomorrow. Members of the public are advised to take note of the latest weather bulletin before departing tomorrow morning.

    Under the influence of the outer rainbands associated with the tropical depression, there will be heavy squally showers and thunderstorms over the coast of Guangdong in the next few days. Seas will be rough with swells.

    (Precautionary Announcements with No. 3 Signal)

    1. Please complete precautions as soon as possible. Make sure objects likely to be blown away are securely fastened or taken indoors. Check if all windows and doors can be securely locked.

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

    3. Seas are rough and there are swells. You are advised to stay away from the shoreline and low-lying areas, and not to engage in water sports.

    4. Avoid staying in areas exposed to high winds. Drivers using highways and flyovers should be alert to violent gusts.

    5. Small vessels not yet in typhoon shelters should seek shelter without delay. Use heavy anchors and check that all deck fittings are firmly fastened.

    6. 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 21:30 HKT 30/Jul/2019


    Tropical Cyclone Warning

    At 301200 UTC, Tropical Depression over the northern part of South China Sea with central pressure 996 hectopascals was centred within 90 nautical miles of one seven point eight degrees north (17.8 N) one one four point four degrees east (114.4 E) and is forecast to move northwest at about 6 knots for the next 24 hours.

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

    Radius of over 2 metre waves 300 nautical miles over northern semicircle, 240 nautical miles elsewhere.

    Forecast position and intensity at 311200 UTC
    Two zero point zero degrees north (20.0 N)
    One one two point two degrees east (112.2 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 011200 UTC
    Two one point three degrees north (21.3 N)
    One zero eight point nine degrees east (108.9 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 021200 UTC
    Two one point zero degrees north (21.0 N)
    One zero six point eight degrees east (106.8 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 031200 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 30/Jul/2019 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.4 C
Minimum Air Temperature                     27.4 C
Grass Minimum Temperature                   27.2 C
Relative Humidity                        72 - 91 Percent
Rainfall                                     1.0 mm 
Total rainfall since 1st January          1304.0 mm
Against an average of                     1456.5 mm

Other Stations                Min                  Max
King's Park                  26.5 C               31.3 C
Wong Chuk Hang               26.7 C               31.6 C
Ta Kwu Ling                  26.2 C               33.0 C
Lau Fau Shan                 25.8 C               34.6 C
Tai Po                       24.9 C               29.9 C
Sha Tin                      25.2 C               30.9 C
Tuen Mun                     27.0 C               31.3 C
Tseung Kwan O                26.0 C               30.3 C
Sai Kung                     26.3 C               30.7 C
Cheung Chau                  25.9 C               33.6 C
Chek Lap Kok                 28.2 C               33.9 C
Tsing Yi                     27.1 C               33.0 C
Shek Kong                    25.7 C               33.1 C
Tsuen Wan Ho Koon            25.5 C               31.1 C
Tsuen Wan Shing Mun Valley   26.3 C               31.8 C
Hong Kong Park               27.3 C               31.5 C
Shau Kei Wan                 25.6 C               29.8 C
Kowloon City                 26.4 C               31.7 C
Happy Valley                 27.2 C               31.6 C
Wong Tai Sin                 26.3 C               32.2 C
Stanley                      25.6 C               30.7 C
Kwun Tong                    26.3 C               30.3 C
Sham Shui Po                 26.3 C               32.3 C
Kai Tak Runway Park          26.4 C               30.3 C
Yuen Long Park               25.7 C               34.2 C
Tai Mei Tuk               25.7 C               32.2 C

Duration of sunshine (King's Park):              3.3 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 10.
 

Yesterday's (29 Jul 2019) 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                           0.08
Tap Mun                             0.08
Kat O                               0.10
Yuen Ng Fan                         0.11
Tai Mei Tuk                         0.11
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                        0.12

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 29 Jul
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