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Bulletin issued at 19:02 HKT 11/Jul/2018

At 7 p.m. at the Hong Kong Observatory the air temperature was 31 degrees Celsius and the relative humidity 71 per cent.

The air temperatures at other places were:

King's Park 30 degrees;
Wong Chuk Hang 29 degrees;
Ta Kwu Ling 32 degrees;
Lau Fau Shan 30 degrees;
Tai Po 31 degrees;
Sha Tin 30 degrees;
Tuen Mun 30 degrees;
Tseung Kwan O 30 degrees;
Sai Kung 31 degrees;
Cheung Chau 29 degrees;
Chek Lap Kok 31 degrees;
Tsing Yi 29 degrees;
Shek Kong 30 degrees;
Tsuen Wan Ho Koon 28 degrees;
Tsuen Wan Shing Mun Valley 29 degrees;
Hong Kong Park 29 degrees;
Shau Kei Wan 29 degrees;
Kowloon City 30 degrees;
Happy Valley 30 degrees;
Wong Tai Sin 30 degrees;
Stanley 29 degrees;
Kwun Tong 30 degrees;
Sham Shui Po 29 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 30 degrees;
Tai Mei Tuk 30 degrees.

Here is the information on Tropical Storm Maria at 7 p.m.:
Location: 27.1 degrees north, 117.3 degrees east.


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


Climatological Information for 11 Jul

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 18:45 HKT 11/Jul/2018

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

The subsiding air in the outer circulation of Tropical Cyclone Maria is bringing generally fine weather to western Guangdong. Locally, it was very hot in the afternoon. Temperatures over many places rose to 33 degrees or above.

Severe Tropical Storm Maria has weakened into a tropical storm. At 7 p.m., Maria was centred about 230 kilometres west-northwest of Fuzhou. It is forecast to move west-northwest at about 25 kilometres per hour across inland Fujian and weaken.

Weather forecast for tonight and tomorrow

Mainly fine. Hot during the day tomorrow. Becoming cloudy with a few showers later. Temperatures will range between 27 and 32 degrees. Light winds, becoming moderate south to southeasterly winds.

Outlook : Squally showers and thunderstorms in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 12/07/2018; 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 11/Jul/2018

HURRICANE WARNING AREA: TAIWAN STRAIT.
GALE WARNING AREAS: KWANGTUNG AND BASHI.

GENERAL SITUATION AT 102100 UTC:
FOR DETAILS ON SEVERE TYPHOON MARIA (1808), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 110100 UTC:

HONG KONG= SE 3-4. FINE. TEMP 33-28 C. =
KWANGTUNG= S 4-5, UP TO 8 IN E. FINE. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS IN E. SEA UP TO 6 M. SWELL S UP TO 2 M. =
TAIWAN STRAIT= SW 11-12, SE 6-7 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 12-14 M, 3-4 M LATER. SWELL E TO NE 5-7 M. =
BASHI= S TO SW 6-7, UP TO 8 AT FIRST. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M AT FIRST. SWELL E TO NE 3-5 M. =
PRATAS= S TO SW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2 M, E TO NE 2-3 M. =
BALINTANG= S TO SW 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO NE 3-5 M. =
SCARBOROUGH= S TO SW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2 M, NE 2-3 M. =
PARACEL= S 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2 M. =
TONKIN= E TO NE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= N TO NW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S UP TO 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 19:30 HKT 11/Jul/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 11 July 2018

    Warnings:
    Strong winds in Nan'ao.

    Weather Situation:
    A broad area of low pressure is bringing unsettled weather to the south China coastal waters.

    Severe Tropical Storm Maria has weakened into a tropical storm. At 7 p.m., Maria with maximum sustained winds of about 85 kilometres per hour near its centre was located near 27.1 degrees north, 117.3 degrees east. It is forecast to move west-northwest at about 25 kilometres per hour across inland Fujian and weaken.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South to southeast force 4 to 5.
    A few showers later.
    Moderate seas.

    Nan'ao:
    South to southeast force 5 to 6.
    Isolated squally showers and thunderstorms.
    Moderate to rough seas.

    Shanwei, South of Hong Kong and Shangchuan Dao:
    South to southeast force 4 to 5.
    Isolated showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    East to southeasterly winds of force 5 to 6, occasionally force 7. Isolated squally showers and thunderstorms.

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

    Waglan Island Wind south-southwest force 4
      Visibility 41 Kilometres

    Shantou Wind south-southeast force 2
      Visibility 30 Kilometres

    Dongsha Wind southwest force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind south force 4

    Macau Wind south force 3
      Visibility 23 Kilometres

    Xisha Wind southwest force 3
      Visibility 25 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 11/JUL/2018
    (Next update at 01:30 HKT 12/JUL/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     TYPHOON MARIA HAS WEAKENED INTO A SEVERE
     TROPICAL STORM.
     AT 4 P.M., MARIA WAS CENTRED ABOUT 26.7 DEGREES
     NORTH, 118.1 DEGREES EAST. IT IS FORECAST TO
     MOVE WEST-NORTHWEST AT ABOUT 14 KNOTS ACROSS
     INLAND FUJIAN AND WEAKEN.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  180/5-10
       OFFSHORE:  180/10-15                            33-27
   B.   2000 FT:  180/10                               24
   C.   5000 FT:  270/10                               20
   D.  10000 FT:  070/10                               14
   E.  18000 FT:  050/15                               MS2
   F.  24000 FT:  070/10                               MS12
   G.  30000 FT:  070/10                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT.
   K. VISIBILITY    : 10 KM.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 12600 FT
   M. TURBULENCE    : NIL
   N. SEA STATE     : 0.5-1.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTH TO SOUTHEASTERLY WINDS. MAINLY
     FINE. BECOMING CLOUDY WITH A FEW SHOWERS LATER.=

    ===================================================================
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 11:48 HKT on 10 Jul 18

    VHHK SIGMET 1 VALID 100350/100750 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1742 E11448 - N1642 E11400 - N1930 E11130 - N1948 E11130 - N1948 E11212 - N1742 E11448 TOP FL450 MOV W 07KT NC= VHHK SIGMET 5 VALID 092350/100350 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1736 E11442 - N1642 E11400 - N1848 E11206 - N1900 E11324 - N1736 E11442 TOP FL400 STNR 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 18:30 HKT 11/Jul/2018


    Tropical Cyclone Warning

    Severe Tropical Storm Maria (1808) has weakened into a Tropical Storm with central pressure 988 hectopascals. At 110900 UTC, it was centred within 90 nautical miles of two six point nine degrees north (26.9 N) one one seven point eight degrees east (117.8 E) and is forecast to move west-northwest at about 14 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 45 knots.

    Radius of over 33 knot winds 90 nautical miles.
    Radius of over 2 metre waves 210 nautical miles.

    Forecast position and intensity at 120900 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 11/Jul/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     32.6 C
Minimum Air Temperature                     26.8 C
Grass Minimum Temperature                   26.4 C
Relative Humidity                        66 - 91 Percent
Rainfall                                     1.3 mm 
Total rainfall since 1st January           697.5 mm
Against an average of                     1199.3 mm

Other Stations                Min                  Max
King's Park                  25.9 C               30.6 C
Wong Chuk Hang               26.9 C               31.3 C
Ta Kwu Ling                  25.7 C               34.7 C
Lau Fau Shan                 23.7 C               33.9 C
Tai Po                       25.7 C               31.4 C
Sha Tin                      26.2 C               32.1 C
Tuen Mun                     26.3 C               32.3 C
Tseung Kwan O                25.4 C               31.4 C
Sai Kung                     25.9 C               31.2 C
Cheung Chau                  26.5 C               30.4 C
Chek Lap Kok                 26.4 C               34.2 C
Tsing Yi                     26.6 C               33.0 C
Shek Kong                    25.5 C               34.0 C
Tsuen Wan Ho Koon            24.9 C               31.3 C
Tsuen Wan Shing Mun Valley   25.7 C               32.1 C
Hong Kong Park               25.5 C               32.4 C
Shau Kei Wan                 26.0 C               30.4 C
Kowloon City                 25.8 C               32.0 C
Happy Valley                 26.8 C               32.9 C
Wong Tai Sin                 26.4 C               30.9 C
Stanley                      26.7 C               31.6 C
Kwun Tong                    25.8 C               30.4 C
Sham Shui Po                 26.7 C               32.1 C
Kai Tak Runway Park          26.7 C               30.2 C
Yuen Long Park               25.5 C               34.5 C
Tai Mei Tuk               26.4 C               32.1 C

Duration of sunshine (King's Park):              8.9 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 10.
 

Yesterday's (10 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 10 Jul
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