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Bulletin issued at 18:02 HKT 30/Oct/2019

At 6 p.m. at the Hong Kong Observatory the air temperature was 25 degrees Celsius and the relative humidity 56 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.0. The intensity of UV radiation was low.

The air temperatures at other places were:

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

Here is the information on Tropical Storm Matmo at 4 p.m.:
Location: 13.1 degrees north, 110.5 degrees east.


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


Climatological Information for 30 Oct

Regional Weather in Hong Kong

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Bulletin updated at 17:45 HKT 30/Oct/2019

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

A dry northeast monsoon is affecting southern China. Locally, the relative humidity over the territory fell below 60 per cent in the afternoon.

At 4 p.m., Tropical Storm Matmo was centred about 410 kilometres southeast of Da Nang. It is forecast to move west at about 22 kilometres per hour towards the southern part of Vietnam.

Weather forecast for tonight and tomorrow

Mainly cloudy and dry. Bright periods tomorrow. Temperatures will range between 22 and 26 degrees. Moderate to fresh east to northeasterly winds, occasionally strong offshore.

Outlook : Becoming fine in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 31/10/2019; 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 30/Oct/2019

N0 WARNING.

GENERAL SITUATION AT 292100 UTC:
FOR DETAILS ON TROPICAL DEPRESSION MATMO (1922), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS. THE NORTHEAST MONSOON IS GENERALLY AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 300100 UTC:

HONG KONG= E TO NE 5-6, OCNL 7. ONE OR TWO RAIN PATCHES. SEA UP TO 4 M. SWELL NE 2 M. TEMP 26-22 C. =
KWANGTUNG= E TO NE 6-7. ISOL SHOWERS. SEA 3-4 M. SWELL NE 2 M. =
TAIWAN STRAIT= NE 6-7. ISOL SHOWERS. SEA 3-4 M. SWELL NE 2 M. =
BASHI= E TO NE 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
PRATAS= NE 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
BALINTANG= E TO NE 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
SCARBOROUGH= E 5-6, OCNL 7 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 4 M AT FIRST. SWELL NE 2 M. =
PARACEL= N TO NE 6-7, E 6-7 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
TONKIN= N TO NE 5-6, BEC NE 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M, BEC 4 M. =
DANANG= N TO NE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 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 16:30 HKT 30/Oct/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 30 October 2019

    Warnings:
    Strong winds in all areas.

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

    At 4 p.m., Tropical Storm Matmo with maximum sustained winds of about 75 kilometres per hour near its centre was located at 13.1 degrees north, 110.5 degrees east. It is forecast to move west at about 22 kilometres per hour towards the southern part of Vietnam.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to northeast force 5 to 6, occasionally force 7.
    Moderate to rough seas.

    Nan'ao and Shanwei:
    Northeast force 6 to 7.
    Rough seas.

    South of Hong Kong and Shangchuan Dao:
    East to northeast force 6 to 7.
    Isolated squally showers and thunderstorms.
    Rough seas.

    Outlook for the next 48 hours
    East to northeasterly winds of force 6 to 7.

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

    Waglan Island Wind east-northeast force 4
      Visibility 29 Kilometres

    Shantou Wind east-southeast force 2
      Visibility 21 Kilometres

    Dongsha Wind northeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind northeast force 4

    Macau Wind north-northeast force 3
      Visibility 15 Kilometres

    Xisha Wind east-northeast force 4
      Visibility 5000 Metres in rain

  • 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 17:30 HKT 30/OCT/2019
    (Next update at 01:30 HKT 31/OCT/2019)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE NORTHEAST MONSOON IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS.
     AT 4 P.M., TROPICAL STORM MATMO WAS CENTRED NEAR
     13.1 DEGREES NORTH 110.5 DEGREES EAST AND IS
     FORECAST TO MOVE WEST AT ABOUT 12 KNOTS TOWARDS
     THE SOUTHERN PART OF VIETNAM.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  050/10-15
       OFFSHORE:  070/15-20, OCNL 25                   25-20
   B.   2000 FT:  070/20-25, OCNL 30                   18
   C.   5000 FT:  090/20-25                            14
   D.  10000 FT:  110/10                               11
   E.  18000 FT:  220/15                               MS4
   F.  24000 FT:  260/25                               MS15
   G.  30000 FT:  250/35                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3500 FT SCT 4500 FT.
   K. VISIBILITY    : 10 KM.
   L. 0 DEG. C LEVEL: 16000 FT      10 DEG. C LEVEL(S) : 11200 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 2.0-3.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EAST TO NORTHEASTERLY WINDS,
     STRONG OFFSHORE. BRIGHT 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.

    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 16:51 HKT on 30 Oct 19

    VHHK SIGMET 3 VALID 300850/301250 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2009 E11648 - N1642 E11400 - N1922 E11137 - N2009 E11648 TOP FL450 MOV W 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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    Bulletin issued at 18:30 HKT 30/Oct/2019


    Tropical Cyclone Warning

    At 300900 UTC, Tropical Storm Matmo (1922) with central pressure 990 hectopascals was centred within 90 nautical miles of one three point one degrees north (13.1 N) one one zero point five degrees east (110.5 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 150 nautical miles over northwest quadrant, 60 nautical miles elsewhere.
    Radius of over 2 metre waves 240 nautical miles.

    Forecast position and intensity at 310900 UTC
    One four point one degrees north (14.1 N)
    One zero five point seven degrees east (105.7 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 312100 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 30/Oct/2019 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     24.7 C
Minimum Air Temperature                     20.3 C
Grass Minimum Temperature                   20.3 C
Relative Humidity                        60 - 71 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2382.7 mm
Against an average of                     2331.0 mm

Other Stations                Min                  Max
King's Park                  19.5 C               24.4 C
Wong Chuk Hang               20.3 C               25.3 C
Ta Kwu Ling                  17.4 C               25.6 C
Lau Fau Shan                 18.4 C               24.6 C
Tai Po                       18.9 C               24.0 C
Sha Tin                      19.4 C               24.1 C
Tuen Mun                     19.5 C               25.1 C
Tseung Kwan O                18.2 C               25.4 C
Sai Kung                     19.8 C               23.9 C
Cheung Chau                  19.0 C               26.6 C
Chek Lap Kok                 19.7 C               26.2 C
Tsing Yi                     19.4 C               25.0 C
Shek Kong                    18.9 C               25.9 C
Tsuen Wan Ho Koon            17.9 C               22.8 C
Tsuen Wan Shing Mun Valley   17.9 C               26.0 C
Hong Kong Park               20.0 C               25.7 C
Shau Kei Wan                 19.4 C               25.1 C
Kowloon City                 18.9 C               24.4 C
Happy Valley                 20.1 C               25.3 C
Wong Tai Sin                 19.5 C               24.5 C
Stanley                      20.1 C               24.9 C
Kwun Tong                    19.3 C               24.6 C
Sham Shui Po                 19.6 C               26.6 C
Kai Tak Runway Park          19.5 C               24.6 C
Yuen Long Park               19.2 C               26.1 C
Tai Mei Tuk               18.7 C               24.9 C

Duration of sunshine (King's Park):              4.5 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 6.
 

Yesterday's (29 Oct 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                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.13
Sai Wan Ho                          0.10
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 Oct
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