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Bulletin issued at 13:41 HKT 17/Jul/2017

At 1 p.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 83 per cent.
During the past hour the mean UV Index recorded at King's Park was 3. The intensity of UV radiation was moderate.

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 3:30 p.m. today. Isolated squally thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 28 degrees;
Wong Chuk Hang 27 degrees;
Ta Kwu Ling 29 degrees;
Lau Fau Shan 29 degrees;
Tai Po 27 degrees;
Sha Tin 29 degrees;
Tuen Mun 29 degrees;
Tseung Kwan O 27 degrees;
Sai Kung 30 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 30 degrees;
Shek Kong 27 degrees;
Tsuen Wan Ho Koon 27 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 27 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 28 degrees;
Happy Valley 28 degrees;
Wong Tai Sin 29 degrees;
Stanley 27 degrees;
Kwun Tong 29 degrees;
Sham Shui Po 31 degrees;
Kai Tak Runway Park 27 degrees;
Yuen Long Park 29 degrees;
Tai Mei Tuk 29 degrees.

Between 11:45 a.m. and 12:45 p.m., the rainfall recorded in various regions were:

Tsuen Wan 0 to 7 mm;
Islands District 0 to 5 mm;
Kwai Tsing 0 to 3 mm;
Southern District 0 to 3 mm;
Wong Tai Sin 0 to 3 mm;
Yuen Long 0 to 2 mm;
Sham Shui Po 0 to 1 mm;
Wan Chai 0 to 1 mm;
Sha Tin 0 to 1 mm;
Eastern District 0 to 1 mm;
Kowloon City 0 to 1 mm;
Tai Po 0 to 1 mm.


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


Climatological Information for 17 Jul

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Bulletin updated at 12:45 HKT 17/Jul/2017

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

An active southerly airstream is bringing thundery showers to the northern part of the South China Sea and the coast of Guangdong. Locally, more than 10 millimetres of rainfall were recorded over many places in the past couple of hours.

At noon, Tropical Storm Talas was centred about 130 kilometres north of Vientiane. It is forecast to move west or west-northwest at about 28 kilometres per hour across the inland areas of Indo-China and dissipate gradually.

Weather forecast for this afternoon and tonight

Mainly cloudy with showers and a few squally thunderstorms. Showers will be heavy at times. Moderate southeasterly winds, fresh at times.

Outlook : Still showery with a few squally thunderstorms tomorrow. Showers will ease off with sunny periods in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 17/07/2017; 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 09:45 HKT 17/Jul/2017

GALE WARNING AREAS: TONKIN AND DANANG.

GENERAL SITUATION AT 162100 UTC:
FOR DETAILS ON TROPICAL STORM TALAS (1704), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 170145 UTC:

HONG KONG= E TO SE 5-6. DOWN TO 1000 M IN SCT SQUALLY HEAVY SHOWERS AND TS. SEA 2-3 M. SWELL S 2-3 M. TEMP 29-26 C. =
KWANGTUNG= SE 5-6, OCNL 7 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL S 2-3 M. =
TAIWAN STRAIT= SE 5-6, OCNL 7 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL S TO SW 2-3 M. =
BASHI= E TO SE 5-6, OCNL 7 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL S TO SW 2-3 M. =
PRATAS= SE 5-6, OCNL 7 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL S TO SW 2-3 M. =
BALINTANG= E TO SE 5-6, OCNL 7 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL S TO SW 2-3 M. =
SCARBOROUGH= S TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S TO SW 2-3 M. =
PARACEL= S TO SE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL S TO SW 2-3 M. =
TONKIN= S TO SE 6-7, UP TO 8 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M AT FIRST. =
DANANG= S TO SE 6-7, UP TO 8 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M AT FIRST. SWELL S TO SW 2-3 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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    Bulletin issued at 12:30 HKT 17/Jul/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 p.m. on 17 July 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    An active southerly airstream is bringing unsettled weather to the south China coastal waters.

    Area forecasts for the next 24 hours

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

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    South to southeast force 5 to 6, occasionally force 7 at first.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

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

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

    Waglan Island Wind south-southeast force 2
      Visibility 18 Kilometres

    Shantou Wind east force 3
      Visibility 1900 Metres in showers

    Dongsha Wind south-southeast force 4
      Visibility 8 Kilometres in rain

    Huangmaozhou Wind southeast force 4

    Xisha Wind southeast force 3
      Visibility 15 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 17/JUL/2017
    (Next update at 17:30 HKT 17/JUL/2017)
    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., TROPICAL STORM TALAS WAS CENTRED
     NEAR 19.0 DEGREES NORTH, 103.7 DEGREES EAST. IT
     IS FORECAST TO MOVE WEST OR WEST-NORTHWEST AT
     ABOUT 14 KNOTS ACROSS THE INLAND AREAS OF
     INDO-CHINA AND DISSIPATE GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  110/10-15
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  120/15-20                            26-29
   B.   2000 FT:  120/15-20                            22
   C.   5000 FT:  120/20                               19
   D.  10000 FT:  160/20                               12
   E.  18000 FT:  140/20                               MS3
   F.  24000 FT:  120/20                               MS13
   G.  30000 FT:  120/15                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      CLOUDY WITH SHOWERS AND A FEW SQUALLY
      THUNDERSTORMS. SHOWERS WILL BE HEAVY AT TIMES.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 2500 FT  BKN 10000 FT.  TEMPO
      FEW CB 1000 FT  SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 10 KM.  TEMPO 3000 M IN SHOWERS.  TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11400 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS.  MOD OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH SOUTHEASTERLY WINDS. CLOUDY
     WITH SHOWERS AND A FEW 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.

    The latest significant weather information
    issued by the Hong Kong Observatory at 13:00 HKT on 17 Jul 17

    VHHK SIGMET 1 VALID 170130/170500 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11130 - N2124 E11130 - N2230 E11342 - N2342 E11730 - N2106 E11730 - N2200 E11600 - N2100 E11130 TOP FL400 MOV WNW 10KT NC= VHHK SIGMET 2 VALID 170500/170900 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF LINE N2200 E11730 - N2000 E11130 TOP FL400 MOV WNW 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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    Bulletin issued at 09:50 HKT 17/Jul/2017


    Tropical Cyclone Warning

    At 170000 UTC, Tropical Storm Talas (1704) with central pressure 990 hectopascals was centred within 60 nautical miles of one nine point zero degrees north (19.0 N) one zero four point zero degrees east (104.0 E) and is forecast to move west or west-northwest at about 15 knots for the next 24 hours.

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

    Radius of over 33 knot winds 30 nautical miles.
    Radius of over 2 metre waves 180 nautical miles.

    No further warnings on this Tropical Storm will be issued by the Hong Kong Observatory unless it re-enters the Hong Kong area of responsibility.

    Forecast position and intensity at 180000 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/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.5 C
Minimum Air Temperature                     26.1 C
Grass Minimum Temperature                   26.2 C
Relative Humidity                        83 - 97 Percent
Rainfall                                    21.0 mm 
Total rainfall since 1st January          1373.0 mm
Against an average of                     1276.0 mm

Other Stations                Min                  Max
King's Park                  25.8 C               28.5 C
Wong Chuk Hang               25.8 C               29.9 C
Ta Kwu Ling                  25.7 C               30.2 C
Lau Fau Shan                 24.6 C               28.9 C
Tai Po                       25.5 C               29.2 C
Sha Tin                      26.6 C               29.9 C
Tuen Mun                     25.4 C               30.9 C
Tseung Kwan O                25.9 C               28.9 C
Sai Kung                     26.0 C               29.6 C
Cheung Chau                  25.0 C               29.2 C
Chek Lap Kok                 26.0 C               31.5 C
Tsing Yi                     25.9 C               30.1 C
Shek Kong                    26.3 C               29.4 C
Tsuen Wan Ho Koon            24.9 C               27.5 C
Tsuen Wan Shing Mun Valley   25.4 C               28.8 C
Hong Kong Park               25.1 C               29.4 C
Shau Kei Wan                 25.2 C               28.8 C
Kowloon City                 25.1 C               28.5 C
Happy Valley                 26.5 C               30.5 C
Wong Tai Sin                 25.8 C               28.8 C
Stanley                      25.5 C               30.1 C
Kwun Tong                    25.5 C               28.9 C
Sham Shui Po                 25.9 C               29.6 C
Kai Tak Runway Park          25.8 C               29.4 C
Yuen Long Park               25.2 C               29.1 C
Tai Mei Tuk               25.7 C               28.8 C

Duration of sunshine (King's Park):              0.6 H
The mean UV index recorded at King's Park yesterday was 2,
the UV intensity was Low.
The maximum UV index for yesterday was 5.
 

Yesterday's (16 Jul 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.07 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                           0.07
Tap Mun                             0.08
Kat O                               0.08
Yuen Ng Fan                         0.11
Tai Mei Tuk                         0.11
Sha Tau Kok                         0.10
Kwun Tong                           0.11
Sai Wan Ho                          0.09
King's Park                         0.14
Tsim Bei Tsui                       0.12
Cape D'Aguilar                      0.12
Chek Lap Kok                        0.14

Note

      

    1. From readings taken at various locations in Hong Kong during
the period 1987-2016, the background ambient gamma radiation
levels may vary between 0.06 and 0.30 microsievert per hour.

    2. The extent of health effects to a person as a result of
exposure to radiation is expressed by a physical quantity
called equivalent dose, in unit of sievert.  Protective
action may be required if there is an increase in the
ambient gamma dose rate above background such that the total
additional dose is expected to exceed 5000 microsieverts in
a relatively short period of time. For example, a dose of
5000 microsieverts may be reached when the ambient gamma
dose rate is 1000 microsieverts per hour (several thousand
times above background) and lasts for 5 hours.

    3. The readings of ambient gamma radiation level from
instrument are expressed in unit of gray, which is
numerically equal to the gamma dose expressed in sievert.
    Climatological Information for 16 Jul
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