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Bulletin issued at 01:02 HKT 17/Jul/2018

At 1 a.m. at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 85 per cent.

The air temperatures at other places were:

King's Park 28 degrees;
Wong Chuk Hang 28 degrees;
Ta Kwu Ling 26 degrees;
Lau Fau Shan 26 degrees;
Tai Po 27 degrees;
Sha Tin 28 degrees;
Tuen Mun 27 degrees;
Tseung Kwan O 27 degrees;
Sai Kung 28 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 29 degrees;
Tsing Yi 29 degrees;
Shek Kong 27 degrees;
Tsuen Wan Ho Koon 26 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 28 degrees;
Shau Kei Wan 28 degrees;
Kowloon City 28 degrees;
Happy Valley 29 degrees;
Wong Tai Sin 28 degrees;
Stanley 28 degrees;
Kwun Tong 28 degrees;
Sham Shui Po 28 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 26 degrees;
Tai Mei Tuk 27 degrees.

Here is the information on Tropical Depression at 11:00 p.m. yesterday:
Location: 18.8 degrees north, 122.0 degrees east.


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 00:45 HKT 17/Jul/2018

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

A ridge of high pressure brought a strong easterly airstream to the coast of Guangdong yesterday. Locally, the weather was mainly cloudy with a few showers at first. There were sunny periods during the day. Besides, the area of low pressure near Luzon intensified into a tropical depression yesterday afternoon. It is expected to move westwards across the northern part of the South China Sea rapidly and towards the vicinity of western Guangdong and Hainan Island today.

At 11 p.m. last night, the tropical depression near Luzon was centred about 490 kilometres north-northeast of Manila. It is forecast to move west at about 38 kilometres per hour across the vicinity of Luzon Strait and enter the South China Sea.

Weather forecast for Hong Kong

Mainly cloudy with sunny intervals and isolated showers. More showers later. Temperatures will range between 26 and 31 degrees. Moderate to fresh easterly winds, strengthening gradually later. There will be swells.

Outlook : Showers on Wednesday and winds will moderate later. Sunny intervals and a few showers in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 17/07/2018; 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 16/Jul/2018

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

GENERAL SITUATION AT 160900 UTC:
FOR DETAILS ON TROPICAL DEPRESSION NEAR LUZON, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 161300 UTC:

HONG KONG= E 6-7, UP TO 8 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M LATER. SWELL E 2 M. TEMP 26-31 C. =
KWANGTUNG= E TO NE 6-7, UP TO 8 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M LATER. SWELL E 2-3 M, SW 2 M. =
TAIWAN STRAIT= NE 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
BASHI= E TO NE 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. =
PRATAS= E TO NE 6-7, CYCLONIC UP TO 8 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M LATER. SWELL E 2-3 M, SW 2 M. =
BALINTANG= CYCLONIC 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. =
SCARBOROUGH= S 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 2-3 M. =
PARACEL= E TO SE 6-7, CYCLONIC UP TO 8 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M LATER. SWELL SW 2-3 M. =
TONKIN= E TO NE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
DANANG= S TO SW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL S TO 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
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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 23:30 HKT 16/Jul/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 16 July 2018

    Warnings:
    Gale force winds in all areas.

    Weather Situation:
    An easterly airstream is affecting the south China coastal waters.

    At 11 p.m., the tropical depression near Luzon with maximum sustained winds of about 45 kilometres per hour near its centre was located at 18.8 degrees north, 122.0 degrees east. It is forecast to move west at about 38 kilometres per hour across the vicinity of Luzon Strait and enter the South China Sea.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 6 to 7, up to force 8 later.
    Isolated showers and thunderstorms.
    Rough to very rough seas.

    Nan'ao and Shanwei:
    East to northeast force 6 to 7, up to force 8 later.
    Isolated showers and thunderstorms.
    Rough to very rough seas.

    South of Hong Kong:
    East to northeast force 6 to 7, becoming cyclonic up to force 8 later.
    Isolated showers and thunderstorms. Frequent heavy squally showers and thunderstorms later.
    Rough to very rough seas.

    Shangchuan Dao:
    East to northeast force 6 to 7, up to force 8 later.
    Isolated showers and thunderstorms. Frequent heavy squally showers and thunderstorms later.
    Rough to very rough seas.

    Outlook for the next 48 hours
    East to southeasterly winds of force 5 to 6, cyclonic winds of up to force 8 in west. Frequent heavy squally showers and thunderstorms in west.

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

    Waglan Island Wind east force 4
      Visibility 13 Kilometres

    Shantou Wind east-northeast force 1
      Visibility 30 Kilometres

    Dongsha Wind northeast force 4
      Visibility 9 Kilometres

    Huangmaozhou Wind east force 4

    Macau Wind east force 3
      Visibility 14 Kilometres

    Xisha Wind southwest force 3
      Visibility 13 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 01:30 HKT 17/JUL/2018
    (Next update at 9:00-9:30 HKT 17/JUL/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 11 P.M. LAST NIGHT, THE TROPICAL DEPRESSION
     NEAR LUZON WAS CENTRED NEAR 18.8 DEGREES NORTH,
     122.0 DEGREES EAST. IT IS FORECAST TO MOVE WEST
     AT ABOUT 20 KNOTS ACROSS THE VICINITY OF LUZON
     STRAIT AND ENTER THE SOUTH CHINA SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  060/5-10
       OFFSHORE:  090/10-15, OCNL 20 AT FIRST          27-31
   B.   2000 FT:  090/15-20                            23
   C.   5000 FT:  080/25                               20
   D.  10000 FT:  100/30                               12
   E.  18000 FT:  100/25                               MS3
   F.  24000 FT:  090/30                               MS12
   G.  30000 FT:  090/30                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      2800 - 3100 FT
   I. WEATHER       : 
      MAINLY CLOUDY WITH ISOLATED SHOWERS. SUNNY
      INTERVALS DURING THE DAY.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT  SCT 4000 FT.
   K. VISIBILITY    : 10 KM. TEMPO 4000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 18000 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD
   N. SEA STATE     : 2.0-3.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     FRESH TO OCCASIONALLY STRONG EASTERLY WINDS.
     MAINLY CLOUDY WITH SUNNY INTERVALS AND ISOLATED
     SHOWERS.=

    ===================================================================
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 13:50 HKT on 16 Jul 18

    VHHK SIGMET 1 VALID 160150/160550 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2106 E11442 - N2036 E11354 - N2136 E11142 - N2212 E11312 - N2106 E11442 TOP FL380 MOV NW 10KT NC= VHHK SIGMET 2 VALID 160550/160950 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2106 E11442 - N2024 E11442 - N2048 E11130 - N2048 E11130 - N2130 E11130 - N2218 E11324 - N2106 E11442 TOP FL380 MOV NW 15KT 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

    Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
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    Bulletin issued at 00:30 HKT 17/Jul/2018


    Tropical Cyclone Warning

    At 161500 UTC, Tropical Depression near Luzon with central pressure 998 hectopascals was centred within 90 nautical miles of one eight point eight degrees north (18.8 N) one two one point eight degrees east (121.8 E) and is forecast to move west at about 20 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 25 knots.

    Radius of over 2 metre waves 180 nautical miles.

    Forecast position and intensity at 171500 UTC
    One nine point seven degrees north (19.7 N)
    One one two point six degrees east (112.6 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 181500 UTC
    One nine point eight degrees north (19.8 N)
    One zero five point nine degrees east (105.9 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 191500 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
     2003copy right image | Important notices | Privacy policy Last revision date: <17 Jul 2018> 

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