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Bulletin issued at 05:02 HKT 13/Sep/2018

At 5 a.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 84 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.

The air temperatures at other places were:

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

Between 3:45 and 4:45 a.m., the rainfall recorded in various regions were:

Islands District 0 to 1 mm.

Here is the information on Tropical Storm Barijat:
Location: 20.8 degrees north, 111.5 degrees east; Maximum sustained wind near its centre: 85 km/h.


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


Climatological Information for 13 Sep

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 04:45 HKT 13/Sep/2018

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

Weather forecast for today

Mainly cloudy with a few squally showers. The maximum temperature will be about 30 degrees. Moderate to fresh east to southeasterly winds, occasionally strong offshore and on high ground at first. There will be swells.

Outlook : Very hot on Friday and Saturday. Weather will deteriorate significantly with frequent heavy rain and squalls on Sunday. Seas will be very rough with swells.


(The above forecast period is valid up to 23:59 HKT today, 13/09/2018; 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 21:00 HKT 12/Sep/2018

GALE WARNING AREAS: HONG KONG, KWANGTUNG, PARACEL AND TONKIN.

GENERAL SITUATION AT 120900 UTC:
FOR DETAILS ON TROPICAL STORM BARIJAT (1823), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 121300 UTC:

HONG KONG= E 7-8, BEC SE 7-8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL E 2 M. TEMP 26-30 C. =
KWANGTUNG= CYCLONIC 8-9, SE 7-8 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, 4-6 M LATER. SWELL E TO NE 3 M. =
TAIWAN STRAIT= NE 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL NE 2 M. =
BASHI= E TO NE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E 2-3 M. =
PRATAS= E 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E 2-3 M. =
BALINTANG= E TO NE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E 2-3 M. =
SCARBOROUGH= E TO NE 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL NE UP TO 2 M. =
PARACEL= SW 6-7, UP TO 8-9 IN N. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, 6-8 M IN N. SWELL NE 2-3 M. =
TONKIN= NE 6, CYCLONIC 8-9 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3 M, 6-8 M LATER. =
DANANG= E TO NE 4-5, BEC SW 5-6. DOWN TO 1000 M IN SQUALLY SHOWERS AND TS. SEA UP TO 2 M, BEC 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 05:30 HKT 13/Sep/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 13 September 2018

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

    Weather Situation:
    At 5 a.m., Tropical Storm Barijat with maximum sustained winds of about 85 kilometres per hour near its centre was located at 20.8 degrees north, 111.5 degrees east. It is forecast to move west at about 22 kilometres per hour towards the vicinity of Leizhou Peninsula.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 5 to 6, becoming east to southeast force 4 to 5.
    A few squally showers.
    Moderate to rough seas.

    Nan'ao:
    East to southeast force 4 to 5.
    Moderate seas.

    Shanwei:
    East to southeast force 5 to 6.
    A few squally showers.
    Moderate to rough seas.

    South of Hong Kong:
    Southeast force 6 to 7.
    Scattered heavy squally showers and thunderstorms.
    Rough seas.

    Shangchuan Dao:
    Cyclonic force 8 to 9, becoming south to southeast force 6 to 7.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Outlook for the next 48 hours
    East to northeasterly winds of force 6 to 7, up to force 8 in east. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind east-northeast force 5
      Visibility 15 Kilometres

    Shantou Wind east force 1
      Visibility 13 Kilometres

    Dongsha Wind east force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind east-southeast force 6

    Macau Wind east force 3
      Visibility 14 Kilometres

    Xisha Wind east force 1
      Visibility 19 Kilometres

  • Explanation of Seas or Sea Waves
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  • Descriptive Terms of Wind Speeds
  • Visibility Readings in Hong Kong Waters
  • Map showing forecast areas
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 13/SEP/2018
    (Next update at 9:00-9:30 HKT 13/SEP/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     SEV TURB AND SEV GUSTS.  GALE FORCE WINDS. ISOL
     CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 1 A.M., TROPICAL STORM BARIJAT WAS CENTRED
     NEAR 20.8 DEGREES NORTH 112.6 DEGREES EAST AND
     IS FORECAST TO MOVE WEST AT ABOUT 10 KNOTS
     TOWARDS THE VICINITY OF LEIZHOU PENINSULA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  090/20-25
                  BECMG  120/15-20
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  090/30G40
                  BECMG 120/20-25                      26-29
   B.   2000 FT:  100/30G40
                  BECMG 120/20-25                      21
   C.   5000 FT:  120/25                               18
   D.  10000 FT:  130/30                               11
   E.  18000 FT:  120/30                               MS3
   F.  24000 FT:  090/20                               MS12
   G.  30000 FT:  070/20                               MS29
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SQUALLY SHOWERS.
      SHOWERS WILL BE MORE FREQUENT WITH
      THUNDERSTORMS AT FIRST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT SCT 5000FT. TEMPO FEW CB 1000 FT
      SCT 2000 FT  BKN 4000 FT
   K. VISIBILITY    : 9 KM. TEMPO 3000 M IN SHOWERS. TEMPO 2000 M IN TS
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11000 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS, OFFSHORE AND  NEAR HILLS
   N. SEA STATE     : 5.0-7.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EAST TO SOUTHEASTERLY WINDS.
     MAINLY CLOUDY WITH A FEW SQUALLY 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.

    sigmet
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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 05:39 HKT on 13 Sep 18

    VHHK SIGMET 17 VALID 122140/130140 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2130 E11400 - N2206 E11618 - N2036 E11630 - N1918 E11124 - N2124 E11124 - N2212 E11318 - N2130 E11400 TOP FL500 MOV WNW 5KT NC= VHHK SIGMET 15 VALID 121920/122140 VHHH- VHHK HONG KONG FIR TC BARIJAT PSN N2048 E11218 CB OBS AT 1800Z WI 120NM OF TC CENTRE TOP FL500 NC FCST AT 2140Z TC CENTRE PSN N2054 E11130=

    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 04:45 HKT 13/Sep/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.

    At 5 a.m., Tropical Storm Barijat was estimated to be about 320 kilometres west-southwest of Hong Kong (near 20.8 degrees north 111.5 degrees east) and is forecast to move west at about 22 kilometres per hour towards the vicinity of Leizhou Peninsula.

    Barijat continues to move westward away from the territory. When Barijat no longer poses a threat to Hong Kong, the Observatory will cancel all Tropical Cyclone Warning Signals.

    (Precautionary Announcements with No. 1 Signal)

    1. There are swells over offshore waters, you are advised to remain staying away from the shoreline.

    2. Listen to radio, watch TV or browse the Hong Kong Observatory's website and mobile app for the latest information on the tropical cyclone.
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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 03:30 HKT 13/Sep/2018


    Tropical Cyclone Warning

    At 121800 UTC, the tropical storm Barijat (1823) with central pressure 988 hectopascals was centred within 90 nautical miles of two zero point eight degrees north (20.8 N) one one two point three degrees east (112.3 E) and is forecast to move west at about 12 knots for the next 24 hours.

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

    Radius of over 33 knot winds 60 nautical miles.
    Radius of over 2 metre waves 120 nautical miles.

    Forecast position and intensity at 131800 UTC
    Two one point four degrees north (21.4 N)
    One zero seven point one degrees east (107.1 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 140600 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 13/Sep/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.7 C
Minimum Air Temperature                     26.9 C
Grass Minimum Temperature                   25.6 C
Relative Humidity                        73 - 84 Percent
Rainfall                                      Trace 
Total rainfall since 1st January          1673.7 mm
Against an average of                     2038.6 mm

Other Stations                Min                  Max
King's Park                  26.3 C               28.6 C
Wong Chuk Hang               26.2 C               28.8 C
Ta Kwu Ling                  25.8 C               31.9 C
Lau Fau Shan                 25.6 C               30.5 C
Tai Po                       26.3 C               28.9 C
Sha Tin                      25.8 C               29.7 C
Tuen Mun                     26.4 C               30.3 C
Tseung Kwan O                24.9 C               28.3 C
Sai Kung                     25.9 C               28.8 C
Cheung Chau                  25.6 C               28.3 C
Chek Lap Kok                 26.5 C               31.1 C
Tsing Yi                     26.4 C               29.8 C
Shek Kong                    25.9 C               30.0 C
Tsuen Wan Ho Koon            24.9 C               28.2 C
Tsuen Wan Shing Mun Valley   25.8 C               29.5 C
Hong Kong Park               25.6 C               28.1 C
Shau Kei Wan                 25.4 C               29.1 C
Kowloon City                 25.3 C               28.9 C
Happy Valley                 26.5 C               29.2 C
Wong Tai Sin                 25.8 C               28.6 C
Stanley                      26.0 C               28.4 C
Kwun Tong                    25.8 C               28.0 C
Sham Shui Po                 26.0 C               29.6 C
Kai Tak Runway Park          26.8 C               28.8 C
Yuen Long Park               26.1 C               31.8 C
Tai Mei Tuk               25.7 C               29.4 C

Duration of sunshine (King's Park):              1.2 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 8.
 

Yesterday's (12 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                           0.09
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                        0.14

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 12 Sep
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