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Bulletin issued at 00:02 HKT 09/Nov/2019

At midnight at the Hong Kong Observatory the air temperature was 23 degrees Celsius and the relative humidity 53 per cent.

Please be reminded that:

The Fire Danger Warning is Red and the fire risk is extreme.

The air temperatures at other places were:

King's Park 22 degrees;
Wong Chuk Hang 22 degrees;
Ta Kwu Ling 17 degrees;
Lau Fau Shan 20 degrees;
Tai Po 22 degrees;
Sha Tin 23 degrees;
Tuen Mun 22 degrees;
Tseung Kwan O 20 degrees;
Sai Kung 22 degrees;
Cheung Chau 21 degrees;
Chek Lap Kok 23 degrees;
Tsing Yi 23 degrees;
Shek Kong 17 degrees;
Tsuen Wan Ho Koon 20 degrees;
Tsuen Wan Shing Mun Valley 18 degrees;
Hong Kong Park 22 degrees;
Shau Kei Wan 21 degrees;
Kowloon City 21 degrees;
Happy Valley 22 degrees;
Wong Tai Sin 22 degrees;
Stanley 22 degrees;
Kwun Tong 21 degrees;
Sham Shui Po 22 degrees;
Kai Tak Runway Park 23 degrees;
Yuen Long Park 21 degrees;
Tai Mei Tuk 21 degrees.

Here is the information on Severe Tropical Storm Nakri at 11:00 p.m. yesterday:
Location: 12.4 degrees north, 115.5 degrees east.


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


Climatological Information for 9 Nov

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Bulletin updated at 00:00 HKT 09/Nov/2019

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

A dry northeast monsoon brought generally fine weather to southern China yesterday. Locally, it was fine and dry. The relative humidity over the territory stayed below 50 per cent. The northeast monsoon is expected to bring generally fine weather to southern China today. It will be windy over the coast. The monsoon will moderate slightly early to midweek next week.

At 11 p.m. last night, Severe Tropical Storm Nakri was centred about 250 kilometres northeast of Nansha. It is forecast to move west at about 12 kilometres per hour across the central and southern parts of the South China Sea.

Weather forecast for Hong Kong (Saturday, 9 Nov 2019)

Fine and dry. It will be slightly cooler. The minimum temperature in the morning will be about 20 degrees in the urban areas, and a couple of degrees lower in the New Territories. The maximum temperature will be around 25 degrees during the day. Moderate to fresh northeasterly winds, strengthening from the east gradually.

Outlook : Mainly fine early to midweek next week with temperatures rising slightly.


(The above forecast period is valid up to 23:59 HKT today, 09/11/2019; 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 08/Nov/2019

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

GENERAL SITUATION AT 080900 UTC:
FOR DETAILS ON SEVERE TROPICAL STORM NAKRI (1924), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS. THE NORTHEAST MONSOON IS GENERALLY AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 081300 UTC:

HONG KONG= NE 5-6, OCNL 7. FINE. SEA UP TO 4 M. SWELL NE 3 M, SE 2-3 M. TEMP 20-25 C. =
KWANGTUNG= N TO NE 6-7, OCNL 8. FINE. SEA UP TO 6 M. SWELL NE 3 M, SE 3 M. =
TAIWAN STRAIT= NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL NE 3-4 M. =
BASHI= NE 7-8. ISOL SHOWERS AND TS. SEA 4-6 M. SWELL NE 3-4 M. =
PRATAS= NE 7-8. ISOL SHOWERS AND TS. SEA 4-6 M. SWELL NE 3-4 M, SE 3 M. =
BALINTANG= NE 7-8. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 3-4 M. =
SCARBOROUGH= E 8-9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M. SWELL NE 4-5 M, SE 4 M. =
PARACEL= N TO NE 7-8, UP TO 9 IN S. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 5-6 M, UP TO 8 M IN S. SWELL NE 4-5 M, SE 4 M. =
TONKIN= N TO NE 5-6. FINE. SEA 2-3 M. =
DANANG= N 6-7, UP TO 8 LATER. DOWN TO 2000 M IN SCT SHOWERS AND TS. SEA 3-4 M, UP TO 6 M LATER. SWELL NE 4 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 08/Nov/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 08 November 2019

    Warnings:
    Gale force winds in Nan'ao, Shanwei, south of Hong Kong and Shangchuan Dao. Strong winds in Hong Kong adjacent waters.

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

    At 11 p.m., Severe Tropical Storm Nakri with maximum sustained winds of about 110 kilometres per hour near its centre was located at 12.4 degrees north, 115.5 degrees east. It is forecast to move west at about 12 kilometres per hour across the central and southern parts of the South China Sea.

    Area forecasts for the next 24 hours

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

    Nan'ao:
    Northeast force 7 to 8.
    Rough to very rough seas.

    Shanwei and South of Hong Kong:
    Northeast force 6 to 7, occasionally force 8.
    Rough to very rough seas.

    Shangchuan Dao:
    North to northeast force 6 to 7, becoming up to force 8.
    Rough to very rough seas.

    Outlook for the next 48 hours
    East to northeasterly winds of force 6 to 7, occasionally force 8.

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

    Waglan Island Wind northeast force 4

    Shantou Wind east-northeast force 2
      Visibility 25 Kilometres

    Dongsha Wind northeast force 5
      Visibility 10 Kilometres

    Huangmaozhou Wind northeast force 4

    Xisha Wind northeast force 4
      Visibility 12 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 08/NOV/2019
    (Next update at 01:30 HKT 09/NOV/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., SEVERE TROPICAL STORM NAKRI WAS
     CENTRED AT 12.5 DEGREES NORTH 116.3 DEGREES
     EAST. IT IS FORECAST TO MOVE WEST AT ABOUT 6
     KNOTS ACROSS THE CENTRAL AND SOUTHERN PARTS OF
     THE SOUTH CHINA SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  020/10-15
       OFFSHORE:  020/15, BECMG 20-25                  26-20
   B.   2000 FT:  040/15, BECMG 20-25                  19
   C.   5000 FT:  040/20                               13
   D.  10000 FT:  050/25                               10
   E.  18000 FT:  320/15                               MS5
   F.  24000 FT:  300/20                               MS11
   G.  30000 FT:  320/25                               MS24
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      NO CLOUDS OF HEIGHT AT OR BELOW 10000 FT.
   K. VISIBILITY    : 10 KM.
   L. 0 DEG. C LEVEL: 15500 FT      10 DEG. C LEVEL(S) : 6600, 10000 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 2.5-3.0 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTH TO NORTHEASTERLY WINDS,
     OCCASIONALLY STRONG OFFSHORE. 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 00:30 HKT 09/Nov/2019


    Tropical Cyclone Warning

    At 081500 UTC, Severe Tropical Storm Nakri (1924) with central pressure 975 hectopascals was centred within 90 nautical miles of one two point four degrees north (12.4 N) one one five point five degrees east (115.5 E) and is forecast to move west at about 6 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 60 knots.

    Radius of over 33 knot winds 150 nautical miles.
    Radius of over 47 knot winds 90 nautical miles.
    Radius of over 2 metre waves 300 nautical miles.

    Forecast position and intensity at 091500 UTC
    One two point seven degrees north (12.7 N)
    One one two point seven degrees east (112.7 E)
    Maximum winds 65 knots.

    Forecast position and intensity at 101500 UTC
    One three point four degrees north (13.4 N)
    One zero nine point six degrees east (109.6 E)
    Maximum winds 55 knots.

    Forecast position and intensity at 111500 UTC
    One four point six degrees north (14.6 N)
    One zero six point five degrees east (106.5 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 121500 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 09/Nov/2019 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     26.8 C
Minimum Air Temperature                     20.8 C
Grass Minimum Temperature                   17.8 C
Relative Humidity                        44 - 56 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2382.7 mm
Against an average of                     2347.3 mm

Other Stations                Min                  Max
King's Park                  20.3 C               26.1 C
Wong Chuk Hang               20.3 C               27.6 C
Ta Kwu Ling                  17.0 C               27.3 C
Lau Fau Shan                 18.8 C               27.5 C
Tai Po                       19.2 C               25.7 C
Sha Tin                      20.7 C               26.7 C
Tuen Mun                     19.9 C               27.1 C
Tseung Kwan O                18.3 C               27.3 C
Sai Kung                     20.4 C               25.7 C
Cheung Chau                  18.7 C               27.5 C
Chek Lap Kok                 21.1 C               27.8 C
Tsing Yi                     20.1 C               27.0 C
Shek Kong                    17.2 C               27.3 C
Tsuen Wan Ho Koon            17.3 C               25.3 C
Tsuen Wan Shing Mun Valley   17.5 C               27.1 C
Hong Kong Park               20.4 C               27.2 C
Shau Kei Wan                 19.7 C               27.2 C
Kowloon City                 19.9 C               26.7 C
Happy Valley                 20.4 C               27.7 C
Wong Tai Sin                 20.4 C               27.3 C
Stanley                      20.6 C               27.3 C
Kwun Tong                    19.5 C               26.3 C
Sham Shui Po                 20.1 C               28.7 C
Kai Tak Runway Park          20.4 C               26.5 C
Yuen Long Park               19.1 C               28.0 C
Tai Mei Tuk               19.3 C               27.4 C

Duration of sunshine (King's Park):              10.2 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 6.
 

Yesterday's (08 Nov 2019) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 to
0.14 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                          0.10
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.14

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 08 Nov
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