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Bulletin issued at 19:02 HKT 21/Nov/2018

At 7 p.m. at the Hong Kong Observatory the air temperature was 25 degrees Celsius and the relative humidity 81 per cent.

The air temperatures at other places were:

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

Between 5:45 and 6:45 p.m., the rainfall recorded in various regions were:

North District 0 to 8 mm;
Tai Po 0 to 4 mm.

Here is the information on Tropical Depression at 7 p.m.:
Location: 10.5 degrees north, 120.5 degrees east.


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


Climatological Information for 21 Nov

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 19:20 HKT 21/Nov/2018

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

A cold front is crossing the coastal areas of Guangdong, bringing rainy weather to the region.

At 4 p.m., the tropical depression over the Philippines was centred about 450 kilometres south of Manila. It is forecast to move west at about 22 kilometres per hour across the central to southern parts of the Philippines.

Weather forecast for tonight and tomorrow

Mainly cloudy. Relatively low visibility and a few rain patches at first. It will become cool appreciably. The minimum temperature tomorrow morning will be about 18 degrees in the urban areas, and a couple of degrees lower in the New Territories. Sunny intervals in the afternoon. The maximum temperature will be around 22 degrees. Moderate to fresh north to northeasterly winds, occasionally strong offshore at first.

Outlook : Mainly fine and dry in the following couple of days. Becoming cloudy with rain early next week.


(The above forecast period is valid up to 23:59 HKT tomorrow, 22/11/2018; 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 21/Nov/2018

GALE WARNING AREAS: HONG KONG, KWANGTUNG, TAIWAN STRAIT, BASHI, PRATAS, BALINTANG, SCARBOROUGH, PARACEL, TONKIN AND DANANG.

GENERAL SITUATION AT 202100 UTC:
AN INTENSE NORTHEAST MONSOON IS EXPECTED TO AFFECT THE FORECAST AREAS LATER. FOR DETAILS ON TROPICAL DEPRESSION OVER THE PHILIPPINES, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 210100 UTC:

HONG KONG= E 6-7, BEC N UP TO 8. DOWN TO 4000 M IN MIST OR RAIN PATCHES. SEA 3-4 M, BEC 6 M. SWELL NE 2 M, 3 M LATER. TEMP 25-20 C. =
KWANGTUNG= E 6-7, BEC N 7-8. DOWN TO 4000 M IN MIST OR RAIN PATCHES. SEA 3-4 M, BEC 6 M. SWELL NE 2 M, 3 M LATER. =
TAIWAN STRAIT= E TO NE 5-6, BEC N 7-8. DOWN TO 4000 M IN MIST OR RAIN PATCHES. SEA 2-3 M, BEC 4-6 M. SWELL NE 2-3 M. =
BASHI= E TO NE 6-7, N 8 LATER. ISOL SHOWERS AND TS. SEA 3-4 M, 6 M LATER. SWELL NE 2-3 M. =
PRATAS= E 6-7, N 8 LATER. ISOL SHOWERS AND TS. SEA 3-4 M, 6 M LATER. SWELL NE 2 M, 3 M LATER. =
BALINTANG= E TO NE 7-8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 2-3 M. =
SCARBOROUGH= E TO NE 7-8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 2-3 M. =
PARACEL= E 6-7, N 8 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS LATER. SEA 3-4 M, 6 M LATER. SWELL NE 2 M, 3 M LATER. =
TONKIN= N 7-8. DOWN TO 4000 M IN MIST OR RAIN PATCHES. SEA 4-6 M. SWELL NE 2 M, 3 M LATER. =
DANANG= E 5-6, N 7-8 LATER. RAIN PATCHES. SEA 2-3 M, 4-6 M LATER. SWELL NE 2 M, 3 M LATER. =
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 19:30 HKT 21/Nov/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 21 November 2018

    Warnings:
    Gale force winds in all areas.

    Weather Situation:
    A cold front is crossing the coastal waters of Guangdong.

    At 7 p.m., the tropical depression over the Philippines with maximum sustained winds of about 45 kilometres per hour near its centre was located near 10.5 degrees north, 120.5 degrees east. It is forecast to move west at about 22 kilometres per hour across the central to southern parts of the Philippines.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North force 6 to 7, occasionally up to force 8.
    A few rain patches, misty at first.
    Rough to very rough seas.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    North force 6 to 7, occasionally up to force 8.
    Rough to very rough seas.

    Outlook for the next 48 hours
    North to northeasterly winds of force 7 to 8.

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

    Waglan Island Wind east force 1
      Visibility 9 Kilometres

    Shantou Wind southwest force 1
      Visibility 23 Kilometres

    Dongsha Wind northeast force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 4

    Xisha Wind northeast force 3
      Visibility 24 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 17:30 HKT 21/NOV/2018
    (Next update at 01:30 HKT 22/NOV/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A COLD FRONT FORMED OVER INLAND GUANGDONG AND IS
     MOVING SOUTHWARDS GRADUALLY.  IT IS EXPECTED TO
     CROSS THE COASTAL AREAS TONIGHT.
     AT 4 P.M., THE TROPICAL DEPRESSION OVER THE
     PHILIPPINES WAS CENTRED NEAR 10.5 DEGREES NORTH,
     121.3 DEGREES EAST.  IT IS FORECAST TO MOVE WEST
     AT ABOUT 12 KNOTS ACROSS THE CENTRAL TO SOUTHERN
     PARTS OF THE PHILIPPINES.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  300/5-10 BEC 360/15-20
       OFFSHORE:  090/10 BEC 360/20-25, OCNL 30        26-18
   B.   2000 FT:  180/10 BEC 030/20-25, OCNL 30        20-16
   C.   5000 FT:  270/10 BEC 350/10                    14
   D.  10000 FT:  280/15                               7
   E.  18000 FT:  260/35                               MS4
   F.  24000 FT:  250/40                               MS15
   G.  30000 FT:  270/50                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW RAIN AND MIST PATCHES.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1200 FT  SCT 2500 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 3000 M IN RAIN/MIST.
   L. 0 DEG. C LEVEL: 15500 FT      10 DEG. C LEVEL(S) : 8400 FT
   M. TURBULENCE    : MOD TO SEV LATER.
   N. SEA STATE     : 1.5-3.5 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTHERLY WINDS, STRONG
     OFFSHORE.  MAINLY CLOUDY WITH A FEW RAIN AND
     MIST PATCHES AT FIRST.  SUNNY INTERVALS IN THE
     AFTERNOON.=

    ===================================================================
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)

    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 21/Nov/2018


    Tropical Cyclone Warning

    At 210900 UTC, the tropical depression over the Philippines with central pressure 1002 hectopascals was centred within 90 nautical miles of one zero point five degrees north (10.5 N) one two one point zero degrees east (121.0 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 25 knots.

    Radius of over 2 metre waves 90 nautical miles.

    Forecast position and intensity at 220900 UTC
    One zero point eight degrees north (10.8 N)
    One one six point two degrees east (116.2 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 230900 UTC
    One one point two degrees north (11.2 N)
    One one two point eight degrees east (112.8 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 240900 UTC
    One zero point nine degrees north (10.9 N)
    One one zero point one degrees east (110.1 E)
    Maximum winds 60 knots.

    Forecast position and intensity at 250900 UTC
    One one point nine degrees north (11.9 N)
    One zero eight point zero degrees east (108.0 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 260900 UTC
    One four point zero degrees north (14.0 N)
    One zero seven point three degrees east (107.3 E)
    Maximum winds 25 knots.



    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 21/Nov/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     24.0 C
Minimum Air Temperature                     22.0 C
Grass Minimum Temperature                   21.6 C
Relative Humidity                        74 - 87 Percent
Rainfall                                     0.1 mm 
Total rainfall since 1st January          2087.7 mm
Against an average of                     2361.0 mm

Other Stations                Min                  Max
King's Park                  21.6 C               24.0 C
Wong Chuk Hang               21.4 C               24.7 C
Ta Kwu Ling                  19.4 C               26.5 C
Lau Fau Shan                 19.9 C               29.6 C
Tai Po                       20.2 C               23.0 C
Sha Tin                      20.8 C               24.0 C
Tuen Mun                     21.7 C               25.4 C
Tseung Kwan O                21.2 C               23.6 C
Sai Kung                     21.8 C               23.4 C
Cheung Chau                  21.6 C               25.0 C
Chek Lap Kok                 22.2 C               26.4 C
Tsing Yi                     22.3 C               25.5 C
Shek Kong                    21.2 C               26.6 C
Tsuen Wan Ho Koon            20.7 C               25.3 C
Tsuen Wan Shing Mun Valley   21.6 C               25.6 C
Hong Kong Park               21.5 C               24.5 C
Shau Kei Wan                 21.0 C               23.0 C
Kowloon City                 21.4 C               25.3 C
Happy Valley                 21.6 C               25.4 C
Wong Tai Sin                 21.5 C               24.7 C
Stanley                      21.2 C               23.5 C
Kwun Tong                    21.0 C               23.9 C
Sham Shui Po                 22.1 C               25.7 C
Kai Tak Runway Park          21.8 C               23.6 C
Tai Mei Tuk               20.5 C               24.1 C

Duration of sunshine (King's Park):              2.9 H
The mean UV index recorded at King's Park yesterday was 1,
the UV intensity was Low.
The maximum UV index for yesterday was 4.
 

Yesterday's (20 Nov 2018) 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                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.13
Sai Wan Ho                          0.09
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 20 Nov
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