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Bulletin issued at 00:02 HKT 30/Sep/2019

At midnight at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 81 per cent.

The air temperatures at other places were:

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

Here is the information on Typhoon Mitag at 11:00 p.m. yesterday:
Location: 20.6 degrees north, 124.5 degrees east.


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


Climatological Information for 30 Sep

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Bulletin updated at 00:00 HKT 30/Sep/2019

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

A dry continental airstream brought generally fine weather to southern China yesterday. Locally, it was fine, but hazy in the afternoon. The visibility in the harbour once fell below 4000 metres. Under the influence of a continental airstream, the weather will be fine and hot but hazy over southern China in the next couple of days.

Besides, Tropical Storm Mitag intensified progressively into a typhoon yesterday. At 11 p.m. last night, Mitag was centred about 580 kilometres south-southeast of Taibei. It is forecast to move northwest at about 22 kilometres per hour towards the seas east of Taiwan.

Weather forecast for Hong Kong (Monday, 30 Sep 2019)

Fine but hazy. The minimum temperature will be about 27 degrees. Hot and dry during the day. The maximum temperature will be around 32 degrees in the urban areas, and a couple of degrees higher in the New Territories. Light to moderate northwesterly winds.

Outlook : Mainly fine and hot in the following few days. Still hazy on Tuesday and Wednesday.


(The above forecast period is valid up to 23:59 HKT today, 30/09/2019; 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 29/Sep/2019

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

GENERAL SITUATION AT 290900 UTC:
FOR DETAILS ON SEVERE TROPICAL STORM MITAG (1918), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 291300 UTC:

HONG KONG= N TO NW 4, W 4 LATER. DOWN TO 4000 M IN SOME HAZE. SWELL NE 2 M. TEMP 27-32 C. =
KWANGTUNG= N TO NW 4-5, W 4-5 LATER. FINE. SEA UP TO 2 M. SWELL NE 2 M. =
TAIWAN STRAIT= NE 6-7, BEC 7-8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M, BEC 4-6 M. SWELL NE 2-3 M. =
BASHI= CYCLONIC 11-12, BEC W TO SW 10-11. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA 12-14 M, BEC 10-12 M. SWELL NE 3-7 M. =
PRATAS= N TO NE 5-6, BEC W TO NW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL NE 3 M. =
BALINTANG= N TO NW 9-10, BEC W TO SW 9-10. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA 8-10 M. SWELL NE 3-5 M. =
SCARBOROUGH= N TO NW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL NE 2-3 M. =
PARACEL= N TO NE 4-5, NW 4-5 LATER. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL NE 2 M. =
TONKIN= N TO NW 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
DANANG= N TO NW 4-5. ISOL SHOWERS. 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 23:30 HKT 29/Sep/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 29 September 2019

    Warnings:
    Strong winds in Nan'ao.

    Weather Situation:
    At 11 p.m., Typhoon Mitag with maximum sustained winds of about 120 kilometres per hour near its centre was located at 20.6 degrees north, 124.5 degrees east. It is forecast to move northwest at about 22 kilometres per hour towards the seas east of Taiwan.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North to northwest force 4, becoming west force 4 later.
    Some haze.
    Moderate seas.

    Nan'ao:
    North to northeast force 5 to 6, becoming west to northwest force 6 to 7.
    Moderate to rough seas, becoming very rough later.

    Shanwei:
    North to northeast force 4 to 5, becoming west to northwest force 4 to 5.
    Moderate seas.

    South of Hong Kong and Shangchuan Dao:
    North to northwest force 4 to 5, becoming west force 4 to 5 later.
    Moderate seas.

    Outlook for the next 48 hours
    West to southwesterly winds of force 4 to 5. Isolated showers and thunderstorms.

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

    Waglan Island Wind west-southwest force 3
      Visibility 13 Kilometres

    Shantou Wind east-southeast force 1
      Visibility 29 Kilometres

    Huangmaozhou Wind southwest force 1

    Xisha Wind northeast force 2
      Visibility 23 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 29/SEP/2019
    (Next update at 01:30 HKT 30/SEP/2019)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     UNDER THE INFLUENCE OF A DRY CONTINENTAL
     AIRSTREAM, THE WEATHER IS GENERALLY FINE OVER
     SOUTHERN CHINA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  VRB/5-10                             32-27
   B.   2000 FT:  020/10                               23
   C.   5000 FT:  040/15                               17
   D.  10000 FT:  030/5-10                             11
   E.  18000 FT:  250/20                               MS4
   F.  24000 FT:  250/30                               MS15
   G.  30000 FT:  250/40                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT
   K. VISIBILITY    : 7 KM.
   L. 0 DEG. C LEVEL: 16000 FT      10 DEG. C LEVEL(S) : 11400 FT
   M. TURBULENCE    : NIL
   N. SEA STATE     : 0.5-1.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT TO MODERATE NORTHWESTERLY 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.

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    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 00:30 HKT 30/Sep/2019


    Tropical Cyclone Warning

    At 291500 UTC, Typhoon Mitag (1918) with central pressure 975 hectopascals was centred within 60 nautical miles of two zero point six degrees north (20.6 N) one two four point five degrees east (124.5 E) and is forecast to move northwest at about 12 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 65 knots.

    Radius of over 33 knot winds 210 nautical miles over eastern semicircle, 150 nautical miles elsewhere.
    Radius of over 47 knot winds 60 nautical miles.
    Radius of over 63 knot winds 30 nautical miles.
    Radius of over 2 metre waves 300 nautical miles.

    Forecast position and intensity at 301500 UTC
    Two five point two degrees north (25.2 N)
    One two two point two degrees east (122.2 E)
    Maximum winds 85 knots.

    Forecast position and intensity at 011500 UTC
    Two nine point seven degrees north (29.7 N)
    One two two point four degrees east (122.4 E)
    Maximum winds 65 knots.

    Forecast position and intensity at 021500 UTC
    Three four point zero degrees north (34.0 N)
    One two five point three degrees east (125.3 E)
    Maximum winds 55 knots.

    Forecast position and intensity at 031500 UTC
    Three seven point zero degrees north (37.0 N)
    One three zero point nine degrees east (130.9 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 041500 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 30/Sep/2019 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.7 C
Minimum Air Temperature                     26.6 C
Grass Minimum Temperature                   25.0 C
Relative Humidity                        63 - 83 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2233.2 mm
Against an average of                     2226.7 mm

Other Stations                Min                  Max
King's Park                  25.4 C               31.9 C
Wong Chuk Hang               24.0 C               31.8 C
Ta Kwu Ling                  22.1 C               34.3 C
Lau Fau Shan                 24.0 C               32.7 C
Tai Po                       24.2 C               31.3 C
Sha Tin                      23.8 C               33.6 C
Tuen Mun                     24.4 C               33.6 C
Tseung Kwan O                23.7 C               32.8 C
Sai Kung                     25.0 C               31.6 C
Cheung Chau                  24.4 C               33.5 C
Chek Lap Kok                 25.6 C               33.4 C
Tsing Yi                     24.1 C               31.7 C
Tsuen Wan Ho Koon            22.4 C               30.7 C
Tsuen Wan Shing Mun Valley   22.8 C               32.6 C
Hong Kong Park               25.0 C               30.7 C
Shau Kei Wan                 25.3 C               32.5 C
Kowloon City                 25.4 C               33.4 C
Happy Valley                 24.7 C               33.3 C
Wong Tai Sin                 24.9 C               33.0 C
Stanley                      25.2 C               32.2 C
Kwun Tong                    25.4 C               32.4 C
Sham Shui Po                 25.3 C               34.3 C
Kai Tak Runway Park          25.7 C               31.8 C
Yuen Long Park               22.9 C               34.6 C
Tai Mei Tuk               24.9 C               34.7 C

Duration of sunshine (King's Park):              8.8 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 (29 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                         0.10
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                        0.15

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 29 Sep
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