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Bulletin issued at 07:02 HKT 01/Oct/2019

At 7 a.m. at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 63 per cent.

Please be reminded that:

The Fire Danger Warning is Yellow and the fire risk is high.
The Very Hot Weather Warning is now in force. Very hot weather might cause adverse health effects. Members of the public should take care to avoid heatstroke.

The air temperatures at other places were:

King's Park 28 degrees;
Wong Chuk Hang 25 degrees;
Ta Kwu Ling 23 degrees;
Lau Fau Shan 27 degrees;
Tai Po 27 degrees;
Sha Tin 25 degrees;
Tuen Mun 27 degrees;
Tseung Kwan O 26 degrees;
Sai Kung 27 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 28 degrees;
Shek Kong 24 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 24 degrees;
Hong Kong Park 27 degrees;
Shau Kei Wan 29 degrees;
Kowloon City 27 degrees;
Happy Valley 26 degrees;
Wong Tai Sin 27 degrees;
Stanley 27 degrees;
Kwun Tong 28 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 25 degrees;
Tai Mei Tuk 27 degrees.

Here is the information on Typhoon Mitag at 5 a.m.:
Location: 27.0 degrees north, 122.5 degrees east.


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


Climatological Information for 1 Oct

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 06:45 HKT 01/Oct/2019

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

The weather is generally fine over Guangdong.

At 5 a.m., Typhoon Mitag was centred about 470 kilometres south-southeast of Shanghai. It is forecast to move north at about 20 kilometres per hour in the general direction of the east China coast.

Weather forecast for today

Fine and dry. Very hot with some haze during the day with a maximum temperature of around 33 degrees. Light to moderate west to southwesterly winds.

Outlook : Mainly fine and hot in the next couple of days.


(The above forecast period is valid up to 23:59 HKT today, 01/10/2019; 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 30/Sep/2019

STORM WARNING AREA: TAIWAN STRAIT.
GALE WARNING AREA: BASHI.

GENERAL SITUATION AT 300900 UTC:
FOR DETAILS ON TYPHOON MITAG (1918), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 301300 UTC:

HONG KONG= W TO SW 4. DOWN TO 4000 M IN SOME HAZE. SWELL NE 2 M. TEMP 27-32 C. =
KWANGTUNG= W TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL NE 2-3 M. =
TAIWAN STRAIT= W TO NW 10-11, BEC S TO SW 8-9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 10-12 M, 6-8 M LATER. SWELL NE 3-5 M. =
BASHI= W TO SW 8-9, BEC 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, BEC 3-4 M. SWELL NE 3-5 M. =
PRATAS= W TO SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL NE 3 M. =
BALINTANG= W TO SW 6-7. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 3-4 M. =
SCARBOROUGH= S TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL NE 2-3 M. =
PARACEL= S TO SW 4-5. FINE. SEA UP TO 2 M. SWELL NE 2 M. =
TONKIN= S TO SW 4. FINE. =
DANANG= S TO SW 4. FINE. =
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 01/Oct/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 01 October 2019

    Warnings:
    Strong winds in Nan'ao.

    Weather Situation:
    At 5 a.m., Typhoon Mitag with maximum sustained winds of about 145 kilometres per hour near its centre was located at 27.0 degrees north, 122.5 degrees east. It is forecast to move north at about 20 kilometres per hour in the general direction of the east China coast.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    West to southwest force 4.
    Some haze.
    Moderate seas.

    Nan'ao:
    West to southwest force 5 to 6.
    Isolated showers and thunderstorms.
    Moderate to rough seas.

    Shanwei:
    West to southwest force 4 to 5.
    Isolated showers and thunderstorms.
    Moderate seas.

    South of Hong Kong and Shangchuan Dao:
    West to southwest force 4 to 5.
    Moderate seas.

    Outlook for the next 48 hours
    West to southwesterly winds of force 4 to 5.

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

    Waglan Island Wind west force 4
      Visibility 17 Kilometres

    Shantou Wind west force 1
      Visibility 30 Kilometres

    Dongsha Wind west-southwest force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind west force 4

    Macau Wind west-southwest force 3
      Visibility 13 Kilometres

    Xisha Wind calm
      Visibility 7 Kilometres in mist

  • 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 01/OCT/2019
    (Next update at 9:00-9:30 HKT 01/OCT/2019)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     WINDS ARE RELATIVELY WEAK AND THE WEATHER IS
     GENERALLY FINE OVER GUANGDONG.
     AT 11 P.M. LAST NIGHT, TYPHOON MITAG WAS LOCATED
     AT 25.3 DEGREES NORTH, 122.7 DEGREES EAST. IT IS
     FORECAST TO MOVE NORTH-NORTHWEST AT ABOUT 12
     KNOTS SKIRTING THE COASTAL WATERS OF
     NORTHEASTERN TAIWAN, AND MOVE IN THE GENERAL
     DIRECTION OF THE EAST CHINA COAST LATER.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  270/5-10                             27-32
   B.   2000 FT:  320/10                               25
   C.   5000 FT:  350/15                               18
   D.  10000 FT:  060/10
                  BECMG 270/10                         11
   E.  18000 FT:  320/15                               MS3
   F.  24000 FT:  340/20                               MS12
   G.  30000 FT:  360/15                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      FINE. LOCALIZED HAZE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 4000 FT
   K. VISIBILITY    : 9 KM. TEMPO 4000 M IN HAZE.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 10200 FT
   M. TURBULENCE    : NIL
   N. SEA STATE     : 0.5-1.0 M     SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT TO MODERATE WEST TO SOUTHWESTERLY WINDS.
     FINE. LOCALIZED HAZE.=

    ===================================================================
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.

    There is no Significant Weather Information (SIGMET)

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    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 06:30 HKT 01/Oct/2019


    Tropical Cyclone Warning

    At 302100 UTC, Typhoon Mitag (1918) with central pressure 965 hectopascals was centred within 60 nautical miles of two seven point zero degrees north (27.0 N) one two two point two degrees east (122.2 E) and is forecast to move north at about 10 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 75 knots.

    Radius of over 33 knot winds 210 nautical miles.
    Radius of over 47 knot winds 90 nautical miles.
    Radius of over 63 knot winds 45 nautical miles.
    Radius of over 2 metre waves 300 nautical miles.

    Forecast position and intensity at 012100 UTC
    Three one point three degrees north (31.3 N)
    One two three point three degrees east (123.3 E)
    Maximum winds 60 knots.

    Forecast position and intensity at 022100 UTC
    Three five point six degrees north (35.6 N)
    One two seven point eight degrees east (127.8 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 032100 UTC
    Three seven point six degrees north (37.6 N)
    One three three point one degrees east (133.1 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 042100 UTC
    Become extratropical low.



    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 01/Oct/2019 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     33.4 C
Minimum Air Temperature                     27.2 C
Grass Minimum Temperature                   25.3 C
Relative Humidity                        46 - 85 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2233.2 mm
Against an average of                     2233.1 mm

Other Stations                Min                  Max
King's Park                  26.6 C               33.5 C
Wong Chuk Hang               24.2 C               34.5 C
Ta Kwu Ling                  22.7 C               35.0 C
Lau Fau Shan                 25.2 C               33.5 C
Tai Po                       25.0 C               33.9 C
Sha Tin                      24.1 C               35.1 C
Tuen Mun                     25.3 C               34.0 C
Tseung Kwan O                24.2 C               35.0 C
Sai Kung                     25.3 C               33.4 C
Cheung Chau                  24.7 C               34.9 C
Chek Lap Kok                 26.5 C               34.4 C
Tsing Yi                     25.0 C               33.6 C
Tsuen Wan Ho Koon            23.6 C               33.0 C
Tsuen Wan Shing Mun Valley   23.0 C               35.9 C
Hong Kong Park               25.6 C               33.8 C
Shau Kei Wan                 26.3 C               34.6 C
Kowloon City                 26.1 C               35.3 C
Happy Valley                 25.1 C               36.0 C
Wong Tai Sin                 25.1 C               35.5 C
Stanley                      25.2 C               34.7 C
Kwun Tong                    26.4 C               35.8 C
Sham Shui Po                 25.3 C               35.7 C
Kai Tak Runway Park          26.6 C               35.1 C
Yuen Long Park               24.1 C               36.1 C
Tai Mei Tuk               25.4 C               35.5 C

Duration of sunshine (King's Park):              10.0 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 7.
 

Yesterday's (30 Sep 2019) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 to
0.15 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                               0.11
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.11
Sha Tau Kok                         0.11
Kwun Tong                           0.13
Sai Wan Ho                          0.10
King's Park                         0.15
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.15

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 30 Sep
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