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Bulletin issued at 13:02 HKT 10/Sep/2018

At 1 p.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 73 per cent.
During the past hour the mean UV Index recorded at King's Park was 3. The intensity of UV radiation was moderate.

The low pressure area over the Luzon Strait has strengthened into a tropical depression. It is expected to move across the vicinity of the Luzon Strait slowly today and will affect the northern part of the South China Sea tomorrow. The Observatory will consider issuing the Standby Signal No. 1 tomorrow.

The air temperatures at other places were:

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

Here is the information on Tropical Depression at noon:
Location: 21.6 degrees north, 121.6 degrees east.


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


Climatological Information for 10 Sep

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 12:45 HKT 10/Sep/2018

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

The northeast monsoon is affecting Guangdong.

The area of low pressure over the Luzon Strait has intensified into a tropical depression. At noon, the tropical depression was centred about 180 kilometres southeast of Gaoxiong. It is expected to move across the vicinity of the Luzon Strait slowly at first, and move west at about 12 kilometres per hour entering the northern part of the South China Sea later.

Weather forecast for this afternoon and tonight

Mainly cloudy. Sunny periods and isolated showers in the afternoon. Moderate easterly winds.

Outlook : Mainly fine tomorrow. Windy with a few squally showers midweek this week.


(The above forecast period is valid up to 23:59 HKT today, 10/09/2018; 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 10/Sep/2018

GALE WARNING AREAS: TAIWAN STRAIT AND BASHI.

GENERAL SITUATION AT 092100 UTC:
THE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS. LOW 1002HPA 22N 122E SLOW MOVING INTST INTSF.

MARINE FORECAST FOR 24 HOURS FROM 100100 UTC:

HONG KONG= E TO NE 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL NE UP TO 2 M. TEMP 31-26 C. =
KWANGTUNG= N TO NE 5-6, 7 IN E. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, 4 M IN E. SWELL NE 2 M. =
TAIWAN STRAIT= N TO NE 7-8. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL N TO NE 2-3 M. =
BASHI= E TO NE 6-7, OCNL 8. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL N TO NE 2-3 M. =
PRATAS= N TO NE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3-4 M. SWELL NE 2 M. =
BALINTANG= SW 6-7. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
SCARBOROUGH= W TO NW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL NE UP TO 2 M. =
PARACEL= NE 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL NE 2 M. =
TONKIN= NE 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL NE UP TO 2 M. =
DANANG= NE 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL NE 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 12:30 HKT 10/Sep/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 p.m. on 10 September 2018

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    The northeast monsoon is affecting the south China coastal waters.

    The area of low pressure over the Luzon Strait has intensified into a tropical depression. At noon., the tropical depression with maximum sustained winds of about 45 kilometres per hour near its centre was located at 21.6 degrees north, 121.6 degrees east. It is forecast to move across the vicinity of the Luzon Strait slowly at first, and move west at about 12 kilometres per hour entering the northern part of the South China Sea later.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 4 to 5, occasionally force 6.
    Isolated squally showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao:
    North to northeast force 6 to 7.
    Scattered squally showers and thunderstorms.
    Rough seas.

    Shanwei:
    North to northeast force 6 to 7.
    Isolated squally showers and thunderstorms.
    Rough seas.

    South of Hong Kong:
    Northeast force 5 to 6.
    Isolated squally showers and thunderstorms.
    Moderate to rough seas.

    Shangchuan Dao:
    Northeast force 5 to 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    Northeasterly winds of force 6 to 7, becoming cyclonic winds of force 7 to 8. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind northeast force 3
      Visibility 27 Kilometres

    Shantou Wind east force 1
      Visibility 30 Kilometres

    Dongsha Wind north-northeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 5

    Macau Wind north-northeast force 1
      Visibility 35 Kilometres

    Xisha Wind west force 2
      Visibility 30 Kilometres

  • 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 12:30 HKT 10/SEP/2018
    (Next update at 17:30 HKT 10/SEP/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE NORTHEAST MONSOON IS AFFECTING GUANGDONG.
     THE AREA OF LOW PRESSURE OVER THE LUZON STRAIT
     HAS INTENSIFIED INTO A TROPICAL DEPRESSION.  AT
     NOON, THE TROPICAL DEPRESSION WAS CENTRED NEAR
     21.6 DEGREES NORTH, 121.6 DEGREES EAST.  IT IS
     EXPECTED TO MOVE ACROSS THE VICINITY OF THE
     LUZON STRAIT SLOWLY AT FIRST, AND MOVE WEST AT
     ABOUT 6 KNOTS ENTERING THE NORTHERN PART OF THE
     SOUTH CHINA SEA LATER.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1300 TO 2300 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  080/5-10
       OFFSHORE:  080/15                               31-27
   B.   2000 FT:  100/10 BEC 030/15                    23
   C.   5000 FT:  020/15                               17
   D.  10000 FT:  330/10                               11
   E.  18000 FT:  040/10                               MS2
   F.  24000 FT:  360/10                               MS13
   G.  30000 FT:  080/15                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      SUNNY PERIODS WITH A FEW SHOWERS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT  SCT 4000 FT.
   K. VISIBILITY    : 9 KM.  TEMPO 4000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11000 FT
   M. TURBULENCE    : MOD OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 1.5-2.0 M     SEA TEMPERATURE    : 26 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTH TO NORTHEASTERLY WINDS.  CLOUDY
     PERIODS.=

    ===================================================================
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 11:45 HKT on 10 Sep 18

    VHHK SIGMET 1 VALID 100350/100750 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2018 E11348 - N1848 E11542 - N1812 E11512 - N1800 E11254 - N1930 E11130 - N2106 E11130 - N2018 E11348 TOP FL450 STNR NC = VHHK SIGMET 6 VALID 092350/100350 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2130 E11130 - N1930 E11130 - N1830 E11218 - N1800 E11506 - N1912 E11600 - N2130 E11300 - N2130 E11130 TOP FL450 MOV SW 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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    Severe Weather Information Centre

    Bulletin issued at 12:30 HKT 10/Sep/2018


    Tropical Cyclone Warning

    An area of low pressure over the Luzon Strait has intensified into a Tropical Depression with central pressure 1002 hectopascals. At 100300 UTC, it was centred within 90 nautical miles of two one point five degrees north (21.5 N) one two one point seven degrees east (121.7 E) and is forecast to move across the vicinity of the Luzon Strait slowly at first, and move west at about 6 knots later.

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

    Radius of over 2 metre waves 60 nautical miles.

    Forecast position and intensity at 110300 UTC
    Two one point three degrees north (21.3 N)
    One one nine point one degrees east (119.1 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 120300 UTC
    Two zero point eight degrees north (20.8 N)
    One one six point one degrees east (116.1 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 130300 UTC
    Two zero point seven degrees north (20.7 N)
    One one one point nine degrees east (111.9 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 140300 UTC
    Two one point two degrees north (21.2 N)
    One zero six point four degrees east (106.4 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 150300 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 10/Sep/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     30.5 C
Minimum Air Temperature                     24.6 C
Grass Minimum Temperature                   24.7 C
Relative Humidity                        64 - 96 Percent
Rainfall                                    16.7 mm 
Total rainfall since 1st January          1673.5 mm
Against an average of                     2010.5 mm

Other Stations                Min                  Max
King's Park                  24.0 C               29.4 C
Wong Chuk Hang               24.1 C               30.0 C
Ta Kwu Ling                  23.6 C               30.8 C
Lau Fau Shan                 24.1 C               30.4 C
Tai Po                       24.9 C               28.8 C
Sha Tin                      24.8 C               30.4 C
Tuen Mun                     25.4 C               30.7 C
Tseung Kwan O                23.6 C               30.5 C
Sai Kung                     24.5 C               29.3 C
Cheung Chau                  23.9 C               28.4 C
Chek Lap Kok                 26.3 C               30.4 C
Tsing Yi                     24.6 C               30.8 C
Shek Kong                    24.5 C               31.2 C
Tsuen Wan Ho Koon            23.1 C               28.4 C
Tsuen Wan Shing Mun Valley   24.4 C               30.2 C
Hong Kong Park               23.9 C               29.8 C
Shau Kei Wan                 23.8 C               29.6 C
Kowloon City                 24.2 C               30.8 C
Happy Valley                 24.5 C               30.8 C
Wong Tai Sin                 24.4 C               31.8 C
Stanley                      24.5 C               29.4 C
Kwun Tong                    24.2 C               30.5 C
Sham Shui Po                 24.9 C               31.1 C
Kai Tak Runway Park          24.6 C               29.4 C
Yuen Long Park               25.1 C               31.7 C
Tai Mei Tuk               24.4 C               29.9 C

Duration of sunshine (King's Park):              1.7 H
The mean UV index recorded at King's Park yesterday was 3,
the UV intensity was Moderate.
The maximum UV index for yesterday was 9.
 

Yesterday's (09 Sep 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                           0.10
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                        0.14

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 09 Sep
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