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Bulletin issued at 21:02 HKT 17/Jul/2018

At 9 p.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 92 per cent.

Gusts reaching 70 kilometres per hour or above may continue to affect Hong Kong.

Please be reminded that:

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

The air temperatures at other places were:

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

Between 7:45 and 8:45 p.m., lightning was detected within Lantau and New Territories West. The rainfall recorded in various regions were:

Tuen Mun 4 to 12 mm;
Islands District 0 to 10 mm;
North District 0 to 10 mm;
Kwai Tsing 4 to 8 mm;
Tai Po 0 to 7 mm;
Tsuen Wan 4 to 7 mm;
Sha Tin 2 to 6 mm;
Yuen Long 1 to 6 mm;
Sham Shui Po 3 to 5 mm;
Yau Tsim Mong 1 to 5 mm;
Wong Tai Sin 3 to 4 mm;
Central & Western District 1 to 3 mm;
Kowloon City 1 to 3 mm;
Sai Kung 0 to 3 mm;
Eastern District 1 to 2 mm;
Southern District 0 to 1 mm;
Wan Chai 1 mm;
Kwun Tong 1 mm.

Here is the information on Tropical Storm Son-Tinh:
Location: 19.3 degrees north, 113.5 degrees east; Maximum sustained wind near its centre: 65 km/h.


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


Climatological Information for 17 Jul

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 20:45 HKT 17/Jul/2018

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

Weather forecast for tonight and tomorrow

Strong easterly winds, occasionally gale on high ground. Winds will moderate gradually tomorrow. Mainly cloudy with occasional squally showers and thunderstorms. There will be swells. Sunny intervals tomorrow. Temperatures will range between 27 and 31 degrees.

Outlook : Sunny periods and a few showers in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 18/07/2018; 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 21:00 HKT 17/Jul/2018

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

GENERAL SITUATION AT 170900 UTC:
FOR DETAILS ON TROPICAL STORM SON-TINH (1809), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 171300 UTC:

HONG KONG= E 6-7, OCNL 8 AT FIRST. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M AT FIRST. SWELL E 2 M. TEMP 27-31 C. =
KWANGTUNG= E 6-7, OCNL 8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL E 2-3 M, SW 2 M. =
TAIWAN STRAIT= NE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
BASHI= E 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E 2-3 M, SW 2 M. =
PRATAS= E TO SE 6-7, OCNL 8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL E 2-3 M, SW 2 M. =
BALINTANG= E 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E 2-3 M, SW 2 M. =
SCARBOROUGH= SW 6-7. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 2-3 M, E 2 M. =
PARACEL= CYCLONIC 8, BEC SE 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6 M, BEC 3-4 M. SWELL E 2-3 M, SW 2-3 M. =
TONKIN= E TO NE 6-7, CYCLONIC 7-8 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, 4-6 M LATER. SWELL NE 2 M. =
DANANG= S TO SW 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL S TO SW 2 M, E 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 20:45 HKT 17/Jul/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 8:45 p.m. on 17 July 2018

    Warnings:
    Gale force winds in all areas.

    Weather Situation:
    At 9 p.m., Tropical Storm Son-Tinh with maximum sustained winds of about 65 kilometres per hour near its centre was located near 19.3 degrees north, 113.5 degrees east. It is forecast to move west at about 35 kilometres per hour across the northern part of the South China Sea and towards Hainan Island.

    Area forecasts for the next 24 hours

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

    Nan'ao and Shanwei:
    East force 6 to 7, occasionally force 8.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    South of Hong Kong:
    East to southeast force 7 to 8.
    Frequent heavy squally showers and thunderstorms.
    Very rough seas.

    Shangchuan Dao:
    Cyclonic force 8, becoming east to southeast force 7 to 8.
    Frequent heavy squally showers and thunderstorms.
    Very rough seas.

    Outlook for the next 48 hours
    East to southeasterly winds of force 5 to 6. Scattered heavy squally showers and thunderstorms.

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

    Waglan Island Wind east force 6

    Shantou Wind east force 3
      Visibility 30 Kilometres

    Dongsha Wind east-southeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind east-southeast force 7

    Macau Wind east-southeast force 3
      Visibility 3800 Metres in thunderstorms

    Xisha Wind west-northwest force 2
      Visibility 23 Kilometres

  • Explanation of Seas or Sea Waves
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  • 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 17:30 HKT 17/JUL/2018
    (Next update at 01:30 HKT 18/JUL/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     GALE FORCE WINDS.  SEV TURB AND SEV GUSTS.
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 5 P.M., TROPICAL STORM SON-TINH WAS CENTRED
     NEAR 19.3 DEGREES NORTH 114.6 DEGREES EAST AND
     IS FORECAST TO MOVE WEST AT ABOUT 22 KNOTS
     ACROSS THE NORTHERN PART OF THE SOUTH CHINA SEA
     AND TOWARDS THE VICINITY OF HAINAN ISLAND.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  090/20-25
                  TEMPO VRB/25G35 IN TS
       OFFSHORE:  090/25-30, OCNL 35 LATER             33-27
   B.   2000 FT:  090/25-30, OCNL 35 LATER             25
   C.   5000 FT:  090/40                               20
   D.  10000 FT:  100/40                               12
   E.  18000 FT:  100/35                               MS1
   F.  24000 FT:  090/35                               MS10
   G.  30000 FT:  080/30                               MS24
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH OCCASIONAL SHOWERS AND A FEW
      SQUALLY THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT  SCT 4000 FT.  TEMPO FEW CB 1000 FT
      SCT 2000 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) : 11800 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 4.0-6.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     FRESH TO STRONG EASTERLY WINDS.  MAINLY CLOUDY
     WITH OCCASIONAL SHOWERS.  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 21:30 HKT on 17 Jul 18

    VHHK SIGMET 14 VALID 171315/171715 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF N21 TOP FL450 MOV W 15KT NC= VHHK SIGMET 12 VALID 171030/171500 VHHH- VHHK HONG KONG FIR TC SON-TINH PSN N1918 E11442 CB OBS AT 0900Z WI 120NM OF TC CENTRE TOP FL450 NC FCST AT 1500Z TC CENTRE PSN N1918 E11248= VHHK SIGMET 15 VALID 171330/171800 VHHH- VHHK HONG KONG FIR TC SON-TINH PSN N1912 E11336 CB OBS AT 1200Z WI 120NM OF TC CENTRE TOP FL450 NC FCST AT 1800Z TC CENTRE PSN N1918 E11142=

    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 20:45 HKT 17/Jul/2018

    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., Tropical Storm Son-Tinh was estimated to be about 340 kilometres south-southwest of Hong Kong (near 19.3 degrees north 113.5 degrees east) and is forecast to move west at about 35 kilometres per hour across the northern part of the South China Sea and towards Hainan Island.

    In the past couple of hours, local winds were strengthening and outer rain bands of Son-Tinh also brought squally showers to Hong Kong.

    Based on the current forecast track, Son-Tinh will depart gradually from Hong Kong tonight and tomorrow morning. The chance of issuing the Gale or Storm Signal, No. 8 is rather low.

    As seas are high and there are swells, members of the public are advised to stay away from the shoreline and not to engage in water sports.

    In the past hour, the maximum sustained winds recorded at Cheung Chau, Tate's Cairn and Chek Lap Kok were 56, 53 and 51 kilometres per hour with maximum gusts 65, 75 and 69 kilometres per hour respectively.

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

    3. Listen to radio, watch TV or browse the Hong Kong Observatorys 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

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    Severe Weather Information Centre

    Bulletin issued at 21:30 HKT 17/Jul/2018


    Tropical Cyclone Warning

    At 171200 UTC, Tropical Storm Son-Tinh (1809) with central pressure 990 hectopascals was centred within 90 nautical miles of one nine point two degrees north (19.2 N) one one three point six degrees east (113.6 E) and is forecast to move west at about 18 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 40 knots.

    Radius of over 33 knot winds 60 nautical miles over northern semicircle, 30 nautical miles elsewhere.
    Radius of over 2 metre waves 180 nautical miles over northern semicircle, 120 nautical miles elsewhere.

    Forecast position and intensity at 181200 UTC
    One nine point two degrees north (19.2 N)
    One zero six point seven degrees east (106.7 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 191200 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 17/Jul/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.4 C
Minimum Air Temperature                     25.7 C
Grass Minimum Temperature                   24.0 C
Relative Humidity                        67 - 93 Percent
Rainfall                                     5.8 mm 
Total rainfall since 1st January           873.8 mm
Against an average of                     1276.0 mm

Other Stations                Min                  Max
King's Park                  25.4 C               30.7 C
Wong Chuk Hang               25.9 C               30.6 C
Ta Kwu Ling                  25.6 C               31.7 C
Lau Fau Shan                 24.5 C               31.0 C
Tai Po                       25.6 C               29.6 C
Sha Tin                      26.1 C               31.6 C
Tuen Mun                     26.4 C               31.6 C
Tseung Kwan O                25.2 C               30.6 C
Sai Kung                     26.1 C               30.0 C
Cheung Chau                  25.1 C               29.3 C
Chek Lap Kok                 26.7 C               32.4 C
Tsing Yi                     26.2 C               31.3 C
Shek Kong                    26.1 C               31.4 C
Tsuen Wan Ho Koon            24.8 C               29.6 C
Tsuen Wan Shing Mun Valley   25.3 C               30.5 C
Hong Kong Park               25.1 C               30.0 C
Shau Kei Wan                 25.2 C               30.1 C
Kowloon City                 25.0 C               30.7 C
Happy Valley                 26.4 C               32.1 C
Wong Tai Sin                 25.5 C               30.4 C
Stanley                      25.8 C               30.0 C
Kwun Tong                    25.6 C               29.9 C
Sham Shui Po                 25.8 C               32.4 C
Kai Tak Runway Park          26.1 C               30.1 C
Yuen Long Park               25.8 C               32.2 C
Tai Mei Tuk               25.4 C               30.5 C

Duration of sunshine (King's Park):              5.6 H
The mean UV index recorded at King's Park yesterday was 5,
the UV intensity was Moderate.
The maximum UV index for yesterday was 12.
Sea surface temperature (Waglan Island):        28.2 C 

Yesterday's (16 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                           0.08
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                      0.12
Chek Lap Kok                        0.13

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 16 Jul
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