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Bulletin issued at 11:02 HKT 23/Nov/2018

At 11 a.m. at the Hong Kong Observatory the air temperature was 22 degrees Celsius and the relative humidity 61 per cent.
During the past hour the mean UV Index recorded at King's Park was 4. The intensity of UV radiation was moderate.

The air temperatures at other places were:

King's Park 22 degrees;
Wong Chuk Hang 23 degrees;
Ta Kwu Ling 22 degrees;
Lau Fau Shan 20 degrees;
Tai Po 21 degrees;
Sha Tin 22 degrees;
Tuen Mun 22 degrees;
Tseung Kwan O 23 degrees;
Sai Kung 21 degrees;
Cheung Chau 24 degrees;
Chek Lap Kok 23 degrees;
Tsing Yi 22 degrees;
Shek Kong 21 degrees;
Tsuen Wan Ho Koon 21 degrees;
Tsuen Wan Shing Mun Valley 23 degrees;
Hong Kong Park 23 degrees;
Shau Kei Wan 25 degrees;
Kowloon City 22 degrees;
Happy Valley 24 degrees;
Wong Tai Sin 23 degrees;
Stanley 23 degrees;
Kwun Tong 22 degrees;
Sham Shui Po 24 degrees;
Kai Tak Runway Park 23 degrees;
Yuen Long Park 22 degrees;
Tai Mei Tuk 25 degrees.

Here is the information on Tropical Storm Usagi at 10 a.m.:
Location: 10.6 degrees north, 112.5 degrees east.


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


Climatological Information for 23 Nov

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 10:45 HKT 23/Nov/2018

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

A dry northeast monsoon is affecting Guangdong. Locally, the minimum temperature recorded at the Observatory was 18.1 degrees, the lowest so far since this autumn.

Tropical Depression Usagi has intensify into a tropical storm. At 10 a.m., Usagi was centred about 640 kilometres east of Ho Chi Minh City. It is forecast to move west-southwest at about 18 kilometres per hour across the southern part of the South China Sea. Meanwhile, Typhoon Man-yi was centred about 1250 kilometres south-southwest of Iwo Jima. It is forecast to move north-northwest at about 20 kilometres per hour across the western North Pacific.

Weather forecast for today

Mainly fine and dry. Moderate north to northeasterly winds, fresh at times.

Outlook : Mainly fine tomorrow. Becoming cloudy with rain early next week.


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

GALE WARNING AREAS: TAIWAN STRAIT, BASHI, BALINTANG, PARACEL AND DANANG.

GENERAL SITUATION AT 222100 UTC:
THE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS. FOR DETAILS ON TROPICAL DEPRESSION USAGI (1829), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 230100 UTC:

HONG KONG= N TO NE 5, OCNL 6. CLD. SEA UP TO 3 M. SWELL NE 2 M. TEMP 23-20 C. =
KWANGTUNG= N TO NE 5-6, 7 IN E. RAIN PATCHES. SEA 2-3 M, 4 M IN E. SWELL NE 2-3 M. =
TAIWAN STRAIT= NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL NE 2-3 M. =
BASHI= NE 6-7, OCNL 8. ISOL SHOWERS. SEA UP TO 6 M. SWELL NE 2-3 M. =
PRATAS= NE 6-7. ISOL SHOWERS. SEA 3-4 M. SWELL NE 2-3 M. =
BALINTANG= NE 6-7, OCNL 8. ISOL SHOWERS. SEA UP TO 6 M. SWELL NE 2-3 M. =
SCARBOROUGH= NE 6-7. DOWN TO 2000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2-3 M. =
PARACEL= N TO NE 6-7, 8 AT FIRST. DOWN TO 2000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M, 6 M AT FIRST. SWELL NE 2-3 M. =
TONKIN= N TO NE 5-6. RAIN PATCHES. SEA 2-3 M. SWELL NE 2 M. =
DANANG= N TO NE 6-7, OCNL 8. ISOL SHOWERS AND TS. SEA UP TO 6 M. SWELL NE 2-3 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 09:45 HKT 23/Nov/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:45 a.m. on 23 November 2018

    Warnings:
    Strong winds in all areas.

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

    Tropical Depression Usagi has intensified into a tropical storm. At 10 a.m., Usagi with maximum sustained winds of about 65 kilometres per hour near its centre was located at 10.6 degrees north, 112.5 degrees east. It is forecast to move west-southwest at about 18 kilometres per hour across the southern part of the South China Sea.

    Area forecasts for the next 24 hours

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

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

    South of Hong Kong and Shangchuan Dao:
    North to northeast force 5 to 6, occasionally force 7.
    Moderate to rough seas.

    Outlook for the next 48 hours
    East to northeasterly winds of force 5 to 6.

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

    Waglan Island Wind north force 4
      Visibility 16 Kilometres

    Shantou Wind north force 1
      Visibility 17 Kilometres

    Huangmaozhou Wind northeast force 4

    Macau Wind north force 3
      Visibility 9 Kilometres

    Xisha Wind northeast force 4
      Visibility 15 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 10:15 HKT 23/NOV/2018
    (Next update at 12:30 HKT 23/NOV/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE NORTHEAST MONSOON IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS.
     TROPICAL DEPRESSION USAGI HAS INTENSIFY INTO A
     TROPICAL STORM.  AT 10 A.M., USAGI WAS CENTRED
     NEAR 10.6 DEGREES NORTH, 112.5 DEGREES EAST.  IT
     IS FORECAST TO MOVE WEST-SOUTHWEST AT ABOUT 10
     KNOTS ACROSS THE SOUTHERN PART OF THE SOUTH
     CHINA SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1015 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  020/10 BEC 090/10-15
       OFFSHORE:  020/15 BEC 090/15-20                 20-25
   B.   2000 FT:  020/15 BEC 090/15-20                 16
   C.   5000 FT:  180/10 BEC 340/10                    11
   D.  10000 FT:  280/20                               6
   E.  18000 FT:  270/30                               MS6
   F.  24000 FT:  300/60                               MS16
   G.  30000 FT:  300/70                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT.
   K. VISIBILITY    : 10 KM.
   L. 0 DEG. C LEVEL: 15000 FT
      10 DEG. C LEVEL(S) : 5200, 7600 FT
   M. TURBULENCE    : MOD OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 2.0 M         SEA TEMPERATURE    : 24 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EASTERLY WINDS.  MAINLY 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
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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 23/Nov/2018


    Tropical Cyclone Warning

    The tropical depression Usagi (1829) has intensified into a Tropical Storm with central pressure 996 hectopascals. At 230000 UTC, it was centred within 60 nautical miles of one zero point seven degrees north (10.7 N) one one two point seven degrees east (112.7 E) and is forecast to move west-southwest at about 10 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 35 knots.

    Radius of over 33 knot winds 30 nautical miles.
    Radius of over 2 metre waves 120 nautical miles.

    Forecast position and intensity at 240000 UTC
    One zero point two degrees north (10.2 N)
    One zero nine point five degrees east (109.5 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 250000 UTC
    One zero point four degrees north (10.4 N)
    One zero seven point three degrees east (107.3 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 260000 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 23/Nov/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     21.9 C
Minimum Air Temperature                     18.8 C
Grass Minimum Temperature                   19.2 C
Relative Humidity                        60 - 78 Percent
Rainfall                                     0.2 mm 
Total rainfall since 1st January          2090.3 mm
Against an average of                     2364.9 mm

Other Stations                Min                  Max
King's Park                  18.2 C               21.7 C
Wong Chuk Hang               19.0 C               22.0 C
Ta Kwu Ling                  17.3 C               22.9 C
Lau Fau Shan                 17.2 C               24.0 C
Tai Po                       17.6 C               21.5 C
Sha Tin                      18.3 C               21.2 C
Tuen Mun                     18.2 C               22.9 C
Tseung Kwan O                17.6 C               21.3 C
Sai Kung                     17.8 C               20.9 C
Cheung Chau                  17.7 C               22.6 C
Chek Lap Kok                 18.3 C               23.8 C
Tsing Yi                     18.8 C               22.4 C
Shek Kong                    17.5 C               23.0 C
Tsuen Wan Ho Koon            16.7 C               21.3 C
Tsuen Wan Shing Mun Valley   18.6 C               22.6 C
Hong Kong Park               19.2 C               22.3 C
Shau Kei Wan                 18.5 C               21.9 C
Kowloon City                 17.9 C               22.0 C
Happy Valley                 19.3 C               22.6 C
Wong Tai Sin                 18.3 C               21.6 C
Stanley                      19.1 C               21.8 C
Kwun Tong                    17.9 C               21.5 C
Sham Shui Po                 18.5 C               23.3 C
Kai Tak Runway Park          18.5 C               21.9 C
Yuen Long Park               17.7 C               22.6 C
Tai Mei Tuk               17.3 C               22.4 C

Duration of sunshine (King's Park):              1.4 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 5.
 

Yesterday's (22 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 22 Nov
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