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Bulletin issued at 11:02 HKT 01/Oct/2019

At 11 a.m. at the Hong Kong Observatory the air temperature was 31 degrees Celsius and the relative humidity 56 per cent.
During the past hour the mean UV Index recorded at King's Park was 5. The intensity of UV radiation was moderate.

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 32 degrees;
Wong Chuk Hang 32 degrees;
Ta Kwu Ling 33 degrees;
Lau Fau Shan 31 degrees;
Tai Po 33 degrees;
Sha Tin 33 degrees;
Tuen Mun 33 degrees;
Tseung Kwan O 34 degrees;
Sai Kung 33 degrees;
Cheung Chau 31 degrees;
Chek Lap Kok 31 degrees;
Tsing Yi 31 degrees;
Shek Kong 32 degrees;
Tsuen Wan Ho Koon 30 degrees;
Tsuen Wan Shing Mun Valley 34 degrees;
Hong Kong Park 31 degrees;
Shau Kei Wan 33 degrees;
Kowloon City 34 degrees;
Happy Valley 34 degrees;
Wong Tai Sin 34 degrees;
Stanley 32 degrees;
Kwun Tong 32 degrees;
Sham Shui Po 34 degrees;
Kai Tak Runway Park 33 degrees;
Yuen Long Park 33 degrees;
Tai Mei Tuk 34 degrees.

Here is the information on Typhoon Mitag at 10 a.m.:
Location: 27.8 degrees north, 122.1 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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Bulletin updated at 10:45 HKT 01/Oct/2019

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

The weather is generally fine over Guangdong.

At 10 a.m., Typhoon Mitag was centred about 380 kilometres south of Shanghai. It is forecast to move north-northeast at about 22 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. 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 09:00 HKT 01/Oct/2019

GALE WARNING AREA: TAIWAN STRAIT.

GENERAL SITUATION AT 302100 UTC:
FOR DETAILS ON TYPHOON MITAG (1918), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 010100 UTC:

HONG KONG= W TO SW 4. DOWN TO 4000 M IN SOME HAZE. SWELL NE 2 M. TEMP 33-27 C. =
KWANGTUNG= W TO SW 4-5. ISOL SHOWERS. SEA UP TO 2 M. SWELL NE 2-3 M. =
TAIWAN STRAIT= SW 5-6, 7-8 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, 4-6 M AT FIRST. SWELL NE 3-4 M. =
BASHI= W TO SW 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 3-4 M. =
PRATAS= W TO SW 4-5. FINE. SEA UP TO 2 M. SWELL NE 3 M. =
BALINTANG= W TO SW 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 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. =
TONKIN= S TO SW 4-5. FINE. SEA UP TO 2 M. =
DANANG= S TO SW 4-5. FINE. SEA 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 09:30 HKT 01/Oct/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 01 October 2019

    Warnings:
    Strong winds in Nan'ao.

    Weather Situation:
    At 9 a.m., Typhoon Mitag with maximum sustained winds of about 130 kilometres per hour near its centre was located at 27.6 degrees north, 122.0 degrees east. It is forecast to move north-northeast at about 22 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.
    Moderate to rough seas.

    Shanwei, 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 2
      Visibility 22 Kilometres

    Shantou Wind west-southwest force 1
      Visibility 25 Kilometres

    Dongsha Wind west-southwest force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind west-northwest force 4

    Macau Wind west-southwest force 2
      Visibility 12 Kilometres

    Xisha Wind northwest force 1
      Visibility 10 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 09:30 HKT 01/OCT/2019
    (Next update at 12:30 HKT 01/OCT/2019)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE WEATHER IS GENERALLY FINE OVER GUANGDONG.
     AT 9 A.M., TYPHOON MITAG WAS CENTRED NEAR 27.6
     DEGREES NORTH, 122.0 DEGREES EAST. IT IS
     FORECAST TO MOVE NORTH-NORTHEAST AT ABOUT 12
     KNOTS IN THE GENERAL DIRECTION OF THE EAST CHINA
     COAST.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  270/5-10
       OFFSHORE:  270/10-15                            30-34
   B.   2000 FT:  290/10                               26
   C.   5000 FT:  220/5-10
                  BECMG 320/5-10                       18
   D.  10000 FT:  180/10                               9
   E.  18000 FT:  310/10                               MS3
   F.  24000 FT:  320/10                               MS13
   G.  30000 FT:  310/15                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      FINE. LOCALIZED HAZE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT.
   K. VISIBILITY    : 8 KM. TEMPO 4000 M IN HAZE.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 9200 FT
   M. TURBULENCE    : NIL.
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT TO MODERATE WEST TO SOUTHWESTERLY WINDS.
     FINE.=

    ===================================================================
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

    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 09:30 HKT 01/Oct/2019


    Tropical Cyclone Warning

    At 010000 UTC, Typhoon Mitag (1918) with central pressure 970 hectopascals was centred within 30 nautical miles of two seven point four degrees north (27.4 N) one two two point zero degrees east (122.0 E) and is forecast to move north-northeast at about 12 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 70 knots.

    Radius of over 33 knot winds 210 nautical miles.
    Radius of over 47 knot winds 120 nautical miles over eastern semicircle, 90 nautical miles elsewhere.
    Radius of over 63 knot winds 60 nautical miles.
    Radius of over 2 metre waves 300 nautical miles.

    Forecast position and intensity at 020000 UTC
    Three one point eight degrees north (31.8 N)
    One two three point seven degrees east (123.7 E)
    Maximum winds 60 knots.

    Forecast position and intensity at 030000 UTC
    Three six point one degrees north (36.1 N)
    One two eight point five degrees east (128.5 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 040000 UTC
    Three seven point seven degrees north (37.7 N)
    One three three point nine degrees east (133.9 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 050000 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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