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Bulletin issued at 01:02 HKT 31/Oct/2019

At 1 a.m. at the Hong Kong Observatory the air temperature was 24 degrees Celsius and the relative humidity 69 per cent.

The air temperatures at other places were:

King's Park 23 degrees;
Wong Chuk Hang 24 degrees;
Ta Kwu Ling 19 degrees;
Lau Fau Shan 22 degrees;
Tai Po 22 degrees;
Sha Tin 23 degrees;
Tuen Mun 23 degrees;
Tseung Kwan O 22 degrees;
Sai Kung 24 degrees;
Cheung Chau 23 degrees;
Chek Lap Kok 24 degrees;
Tsing Yi 24 degrees;
Shek Kong 21 degrees;
Tsuen Wan Ho Koon 21 degrees;
Tsuen Wan Shing Mun Valley 22 degrees;
Hong Kong Park 24 degrees;
Shau Kei Wan 23 degrees;
Kowloon City 23 degrees;
Happy Valley 24 degrees;
Wong Tai Sin 24 degrees;
Stanley 24 degrees;
Kwun Tong 23 degrees;
Sham Shui Po 23 degrees;
Kai Tak Runway Park 24 degrees;
Yuen Long Park 22 degrees;
Tai Mei Tuk 23 degrees.

Here is the information on Severe Tropical Storm Matmo at 11:00 p.m. yesterday:
Location: 13.3 degrees north, 109.4 degrees east.


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


Climatological Information for 31 Oct

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Hong Kong Climatology


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Bulletin updated at 00:45 HKT 31/Oct/2019

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

The northeast monsoon affected southern China yesterday. Meanwhile, a band of clouds covered the coast of Guangdong. Locally, it was mainly cloudy. The weather was dry with bright periods during the day, and the relative humidity over the territory fell below 60 per cent. Under the influence of the monsoon, it will be windy over the south China coast today and tomorrow.

Besides, the tropical depression over the southern part of the South China Sea was named Matmo yesterday, and intensified into a severe tropical storm gradually. At 11 p.m. last night, Matmo was centred about 330 kilometres south-southeast of Da Nang. It is forecast to move west at about 22 kilometres per hour across the southern part of Vietnam.

Weather forecast for Hong Kong

Mainly cloudy. One or two light rain patches in the morning and at night. Bright periods during the day. 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 today, 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 21:00 HKT 30/Oct/2019

GALE WARNING AREA: DANANG.

GENERAL SITUATION AT 300900 UTC:
FOR DETAILS ON TROPICAL STORM 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 301300 UTC:

HONG KONG= E TO NE 5-6, OCNL 7. A FEW LIGHT RAIN PATCHES. SEA UP TO 4 M. SWELL NE 2 M. TEMP 22-26 C. =
KWANGTUNG= E TO NE 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
TAIWAN STRAIT= NE 6-7. CLD. SEA 3-4 M. SWELL NE 2 M. =
BASHI= E TO NE 5-6, OCNL 7. ISOL SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 2 M. =
PRATAS= NE 6-7. ISOL SHOWERS. SEA 3-4 M. SWELL NE 2 M. =
BALINTANG= E TO NE 5-6, OCNL 7. ISOL SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 2 M. =
SCARBOROUGH= E TO NE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL NE 2 M. =
PARACEL= N TO NE 6-7, BEC E 6-7. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
TONKIN= N TO NE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. =
DANANG= E TO NE 7-8, SE 5-6 LATER. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, 2-3 M LATER. 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 23:30 HKT 30/Oct/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 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 11 p.m., Severe Tropical Storm Matmo with maximum sustained winds of about 90 kilometres per hour near its centre was located at 13.3 degrees north, 109.4 degrees east. It is forecast to move west at about 22 kilometres per hour across 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.
    One or two light rain patches.
    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 16 Kilometres

    Shantou Wind east force 2
      Visibility 15 Kilometres

    Huangmaozhou Wind east-northeast force 4

    Xisha Wind east-northeast force 4
      Visibility 17 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 01:30 HKT 31/OCT/2019
    (Next update at 9:00-9:30 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 11 P.M. LAST NIGHT, SEVERE TROPICAL STORM
     MATMO WAS CENTRED NEAR 13.3 DEGREES NORTH 109.4
     DEGREES EAST AND IS FORECAST TO MOVE WEST AT
     ABOUT 12 KNOTS ACROSS THE SOUTHERN PART OF
     VIETNAM.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  050/10-15
       OFFSHORE:  070/15-20, OCNL 25                   22-28
   B.   2000 FT:  080/15-20, OCNL 25                   20
   C.   5000 FT:  090/20-25                            16
   D.  10000 FT:  110/10                               10
   E.  18000 FT:  210/15                               MS4
   F.  24000 FT:  270/20                               MS15
   G.  30000 FT:  250/35                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      3300-3600 FT
   I. WEATHER       : 
      MAINLY CLOUDY. ONE OR TWO LIGHT RAIN PATCHES IN
      THE MORNING. BRIGHT PERIODS DURING THE DAY.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3500 FT.
   K. VISIBILITY    : 10 KM. TEMPO 4000 M IN RAIN.
   L. 0 DEG. C LEVEL: 15500 FT      10 DEG. C LEVEL(S) : 8800, 9200, 10000 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,
     OCCASIONALLY STRONG OFFSHORE. BRIGHT PERIODS
     DURING THE DAY. ONE OR TWO LIGHT RAIN PATCHES AT
     NIGHT.=

    ===================================================================
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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    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 31/Oct/2019


    Tropical Cyclone Warning

    At 301500 UTC, Severe Tropical Storm Matmo (1922) with central pressure 985 hectopascals was centred within 60 nautical miles of one three point three degrees north (13.3 N) one zero nine point four degrees east (109.4 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 50 knots.

    Radius of over 33 knot winds 150 nautical miles over northwest quadrant, 90 nautical miles elsewhere.
    Radius of over 47 knot winds 30 nautical miles.
    Radius of over 2 metre waves 270 nautical miles over northern semicircle, 180 nautical miles elsewhere.

    Forecast position and intensity at 311500 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 31/Oct/2019 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     26.4 C
Minimum Air Temperature                     21.5 C
Grass Minimum Temperature                   20.0 C
Relative Humidity                        53 - 68 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2382.7 mm
Against an average of                     2333.5 mm

Other Stations                Min                  Max
King's Park                  21.2 C               26.3 C
Wong Chuk Hang               21.1 C               26.4 C
Ta Kwu Ling                  15.8 C               27.3 C
Lau Fau Shan                 18.9 C               26.4 C
Tai Po                       18.3 C               25.5 C
Sha Tin                      21.1 C               26.3 C
Tuen Mun                     20.6 C               27.5 C
Tseung Kwan O                19.7 C               26.5 C
Sai Kung                     20.8 C               25.5 C
Cheung Chau                  19.4 C               26.4 C
Chek Lap Kok                 20.6 C               28.2 C
Tsing Yi                     20.6 C               26.9 C
Shek Kong                    18.0 C               27.4 C
Tsuen Wan Ho Koon            18.2 C               25.5 C
Tsuen Wan Shing Mun Valley   18.4 C               27.0 C
Hong Kong Park               20.6 C               27.4 C
Shau Kei Wan                 20.5 C               26.6 C
Kowloon City                 20.6 C               26.8 C
Happy Valley                 20.9 C               26.8 C
Wong Tai Sin                 20.5 C               26.8 C
Stanley                      21.9 C               26.7 C
Kwun Tong                    20.5 C               25.8 C
Sham Shui Po                 20.5 C               28.0 C
Kai Tak Runway Park          21.0 C               26.1 C
Yuen Long Park               19.6 C               28.1 C
Tai Mei Tuk               19.4 C               27.6 C

Duration of sunshine (King's Park):              4.4 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 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                         0.11
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 30 Oct
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