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Bulletin issued at 09:16 HKT 07/Jun/2018

At 9 a.m. at the Hong Kong Observatory the air temperature was 26 degrees Celsius and the relative humidity 95 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.5. The intensity of UV radiation was low.

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

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.
The Thunderstorm Warning has been issued. It will remain effective until 1:00 p.m. today. A few squally thunderstorms are expected to occur over Hong Kong.
The Landslip Warning has been issued.
The Special Announcement of Flooding in Northern New Territories has been issued.

The air temperatures at other places were:

King's Park 26 degrees;
Wong Chuk Hang 27 degrees;
Ta Kwu Ling 27 degrees;
Lau Fau Shan 25 degrees;
Tai Po 26 degrees;
Sha Tin 27 degrees;
Tuen Mun 26 degrees;
Tseung Kwan O 26 degrees;
Sai Kung 26 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 27 degrees;
Shek Kong 27 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 26 degrees;
Hong Kong Park 26 degrees;
Shau Kei Wan 26 degrees;
Kowloon City 26 degrees;
Happy Valley 27 degrees;
Wong Tai Sin 26 degrees;
Stanley 27 degrees;
Kwun Tong 26 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 27 degrees;
Yuen Long Park 25 degrees;
Tai Mei Tuk 26 degrees.

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

North District 2 to 47 mm;
Sha Tin 0 to 26 mm;
Yuen Long 0 to 25 mm;
Tai Po 0 to 25 mm;
Islands District 0 to 19 mm;
Tuen Mun 3 to 18 mm;
Tsuen Wan 4 to 16 mm;
Kwai Tsing 4 to 16 mm;
Sai Kung 3 to 16 mm;
Wong Tai Sin 9 to 10 mm;
Sham Shui Po 4 mm;
Eastern District 0 to 1 mm;
Central & Western District 0 to 1 mm;
Southern District 0 to 1 mm;
Kwun Tong 1 mm.

Between midnight and 9 a.m. the minimum temperature was 26.0 degrees Celsius at the Hong Kong Observatory.

Here is the information on Tropical Storm Ewiniar:
Location: 20.9 degrees north, 111.3 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 7 Jun

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Bulletin updated at 08:45 HKT 07/Jun/2018

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

Weather forecast for today

Cloudy with squally showers and thunderstorms. Showers will be heavy at times. The maximum temperature will be about 29 degrees. Moderate to fresh east to southeasterly winds, occasionally strong offshore and on high ground. There will be swells.

Outlook : Squally showers and thunderstorms tomorrow. Still a few showers over the weekend.


(The above forecast period is valid up to 23:59 HKT today, 07/06/2018; 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 07/Jun/2018

GALE WARNING AREAS: KWANGTUNG AND PARACEL.

GENERAL SITUATION AT 062100 UTC:
FOR DETAILS ON TROPICAL STORM EWINIAR (1804), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 070100 UTC:

HONG KONG= E TO SE 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL S TO SW 2 M. TEMP 29-27 C. =
KWANGTUNG= E TO SE 5-6, OCNL 7, CYCLONIC UP TO 8 IN W. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 4 M, UP TO 6 M IN W. SWELL S TO SW 2-3 M. =
TAIWAN STRAIT= E TO NE 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL S TO SW UP TO 2 M. =
BASHI= E TO SE 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL S TO SW 2 M, E TO SE 2 M LATER. =
PRATAS= 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. =
BALINTANG= E TO SE 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL S TO SW 2 M, E TO SE 2 M LATER. =
SCARBOROUGH= S TO SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S TO SW 2-3 M. =
PARACEL= W TO SW 6-7, UP TO 8 IN NW AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M IN NW AT FIRST. SWELL S TO SW 2-3 M. =
TONKIN= W TO NW 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL W TO NW UP TO 2 M. =
DANANG= W TO SW 5-6, OCNL 7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 4 M. 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.


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    • SOUTH CHINA COASTAL WATERS
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    Bulletin issued at 09:30 HKT 07/Jun/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 07 June 2018

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

    Weather Situation:
    At 9 a.m., Tropical Storm Ewiniar with maximum sustained winds of about 65 kilometres per hour near its centre was located at 20.9 degrees north, 111.3 degrees east, it is forecast to move north or north-northeast at about 10 kilometres per hour edging closer to the coast of western Guangdong.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to southeast force 5 to 6, occasionally force 7.
    Scattered squally showers and thunderstorms. Showers will be heavy at times.
    Moderate to rough seas.

    Nan'ao and Shanwei:
    East to southeast force 5 to 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    South of Hong Kong:
    South to southeast force 5 to 6, occasionally force 7.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Shangchuan Dao:
    South to southeast force 7 to 8.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Outlook for the next 48 hours
    South to southeasterly winds of force 6 to 7. Frequent heavy squally showers and thunderstorms.

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

    Shantou Wind east-northeast force 2
      Visibility 27 Kilometres

    Huangmaozhou Wind southeast force 7

    Macau Wind south-southeast force 2
      Visibility 11 Kilometres in thunderstorms

    Xisha Wind west-southwest force 6
      Visibility 15 Kilometres in showers

  • 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 07/JUN/2018
    (Next update at 12:30 HKT 07/JUN/2018)
    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 9 A.M. , TROPICAL STORM EWINIAR WAS LOCATED
     NEAR 20.9 DEGREES NORTH, 111.3 DEGREES EAST. IT
     IS FORECAST TO MOVE NORTH OR NORTH-NORTHEAST AT
     ABOUT 5 KNOTS EDGING CLOSER TO THE COAST OF
     WESTERN GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  130/15-20G30
                  TEMPO VRB/25G35 IN TS
       OFFSHORE:  140/20-25, OCNL 30G40                25-29
   B.   2000 FT:  140/25-30G40                         24
   C.   5000 FT:  140/25-30                            19
   D.  10000 FT:  160/30                               12
   E.  18000 FT:  160/30                               MS2
   F.  24000 FT:  170/25                               MS11
   G.  30000 FT:  190/20                               MS24
   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 1000 FT  SCT 2500 FT  
      TEMPO FEW CB 800 FT  SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 7 KM. TEMPO 2500 M IN SHOWERS. 
                      TEMPO 1500 M IN TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11000 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 3.0-5.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EAST TO SOUTHEASTERLY WINDS,
     OCCASIONALLY STRONG OFFSHORE AND ON HIGH GROUND.
     CLOUDY WITH 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 08:37 HKT on 07 Jun 18

    VHHK SIGMET 1 VALID 070045/070445 VHHH- VHHK HONG KONG FIR EMBD TS FCST NW OF LINE N2212 E11730 - N1742 E11306 TOP FL480 MOV NNW 15KT NC= VHHK SIGMET 7 VALID 062105/070105 VHHH- VHHK HONG KONG FIR EMBD TS FCST NW OF LINE N2218 E11730 - N1836 E11218 TOP FL480 MOV NNW 10KT NC=

    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 08:45 HKT 07/Jun/2018

    Tropical Cyclone Warning Bulletin

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

    The Standby Signal, No. 1 is in force.

    This means that a tropical cyclone now centred within about 800 kilometres of Hong Kong may affect us.

    At 9 a.m., Tropical Storm Ewiniar was estimated to be about 340 kilometres west-southwest of Hong Kong (near 20.9 degrees north 111.3 degrees east) and is forecast to move north or north-northeast at about 10 kilometres per hour edging closer to the coast of western Guangdong.
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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 09:30 HKT 07/Jun/2018


    Tropical Cyclone Warning

    At 070000 UTC, Tropical Storm Ewiniar (1804) with central pressure 995 hectopascals was centred within 90 nautical miles of two zero point eight degrees north (20.8 N) one one one point three degrees east (111.3 E) and is forecast to move north or north-northeast at about 5 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 35 knots.

    Radius of over 33 knot winds 30 nautical miles.
    Radius of over 2 metre waves 90 nautical miles.

    Forecast position and intensity at 080000 UTC
    Two two point four degrees north (22.4 N)
    One one one point five degrees east (111.5 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 090000 UTC
    Two three point three degrees north (23.3 N)
    One one two point four degrees east (112.4 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 100000 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 07/Jun/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.4 C
Minimum Air Temperature                     26.0 C
Grass Minimum Temperature                   25.9 C
Relative Humidity                        88 - 98 Percent
Rainfall                                    58.3 mm 
Total rainfall since 1st January           273.9 mm
Against an average of                      704.7 mm

Other Stations                Min                  Max
King's Park                  25.5 C               28.1 C
Wong Chuk Hang               25.7 C               28.7 C
Ta Kwu Ling                  25.6 C               28.7 C
Lau Fau Shan                 24.6 C               26.0 C
Tai Po                       25.0 C               28.7 C
Sha Tin                      25.4 C               29.0 C
Tuen Mun                     25.6 C               28.1 C
Tseung Kwan O                25.5 C               28.2 C
Sai Kung                     26.2 C               28.8 C
Cheung Chau                  25.3 C               27.3 C
Chek Lap Kok                 25.9 C               29.6 C
Tsing Yi                     26.0 C               29.1 C
Shek Kong                    25.4 C               28.5 C
Tsuen Wan Shing Mun Valley   25.6 C               28.1 C
Hong Kong Park               25.4 C               28.3 C
Shau Kei Wan                 25.3 C               28.3 C
Kowloon City                 25.5 C               28.2 C
Happy Valley                 26.4 C               29.0 C
Wong Tai Sin                 25.9 C               28.3 C
Stanley                      25.6 C               28.6 C
Kwun Tong                    25.8 C               28.4 C
Sham Shui Po                 26.0 C               28.6 C
Kai Tak Runway Park          25.9 C               28.9 C
Yuen Long Park               25.1 C               27.1 C
Tai Mei Tuk               24.9 C               27.4 C

Duration of sunshine (King's Park):              0.0 H
The mean UV index recorded at King's Park yesterday was 0.4,
the UV intensity was Low.
The maximum UV index for yesterday was 1.
 

Yesterday's (06 Jun 2018) 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                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.13
Sai Wan Ho                          0.09
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
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 06 Jun
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