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Bulletin issued at 00:02 HKT 03/Nov/2017

At midnight at the Hong Kong Observatory the air temperature was 24 degrees Celsius and the relative humidity 82 per cent.

The air temperatures at other places were:

King's Park 23 degrees;
Wong Chuk Hang 24 degrees;
Ta Kwu Ling 18 degrees;
Lau Fau Shan 21 degrees;
Tai Po 21 degrees;
Sha Tin 21 degrees;
Tuen Mun 21 degrees;
Tseung Kwan O 21 degrees;
Sai Kung 22 degrees;
Cheung Chau 22 degrees;
Chek Lap Kok 25 degrees;
Tsing Yi 21 degrees;
Shek Kong 19 degrees;
Tsuen Wan Ho Koon 20 degrees;
Tsuen Wan Shing Mun Valley 19 degrees;
Shau Kei Wan 23 degrees;
Kowloon City 23 degrees;
Happy Valley 23 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 21 degrees;
Tai Mei Tuk 22 degrees.

Here is the information on Severe Tropical Storm Damrey at 11:00 p.m. yesterday:
Location: 12.9 degrees north, 114.8 degrees east.


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


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Bulletin updated at 00:00 HKT 03/Nov/2017

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

A dry northeast monsoon continued to affect southern China yesterday. Locally, it was fine and dry. A replenishment of the northeast monsoon is expected to reach the south China coast today.

Besides, the tropical depression west of the Philippines intensified progressively into a severe tropical storm yesterday was named Damrey. At 11 p.m. last night, Damrey was centred about 280 kilometres north of Nansha Dao. It is forecast to move west at about 18 kilometres per hour across the southern part of the South China Sea. The tropical depression over the seas south of Vietnam weakened into an area of low pressure yesterday morning.

Weather forecast for Hong Kong (Friday, 3 Nov 2017)

It will be fine at first. Becoming cloudy with a few rain patches. Temperatures will range between 21 and 25 degrees. Moderate to fresh north to northeasterly winds.

Outlook : Windier and slightly cooler during the weekend.


(The above forecast period is valid up to 23:59 HKT today, 03/11/2017; 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 02/Nov/2017

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

GENERAL SITUATION AT 020900 UTC:
FOR DETAILS ON TROPICAL STORM DAMREY (1723), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS. THE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 021300 UTC:

HONG KONG= N TO NE 6-7, UP TO 8 LATER. RAIN PATCHES. SEA 3-4 M, UP TO 6 M LATER. SWELL NE 2 M. TEMP 21-25 C. =
KWANGTUNG= N TO NE 6-7, 8 LATER. RAIN PATCHES. SEA 3-4 M, 6 M LATER. SWELL NE 2-3 M. =
TAIWAN STRAIT= N TO NE 6-7, 8 LATER. RAIN PATCHES. SEA 3-4 M, 6 M LATER. SWELL NE 2-3 M. =
BASHI= NE 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL NE 3 M. =
PRATAS= N TO NE 6-7, 8 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M, 6 M LATER. SWELL NE 3 M. =
BALINTANG= E TO NE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 3 M. =
SCARBOROUGH= E TO SE 6-7, OCNL 8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL NE 3 M, SE 3 M. =
PARACEL= N TO NE 7-8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 3 M, SE 3 M. =
TONKIN= N 6-7, 8 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS LATER. SEA 3-4 M, 6 M LATER. SWELL NE 2 M. =
DANANG= N 6-7, BEC 8. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, BEC 6 M. SWELL NE 3 M, SE 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 23:30 HKT 02/Nov/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 02 November 2017

    Warnings:
    Gale force winds in all areas.

    Weather Situation:
    A replenishment of the northeast monsoon will reach the south China coastal waters today.

    At 11 p.m., Damrey with maximum sustained winds of about 90 kilometres per hour near its centre was located near 12.9 degrees north, 114.8 degrees east. It is forecast to move west 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 6 to 7, becoming force 8 later.
    A few rain patches.
    Rough seas, becoming very rough later.

    Nan'ao, Shanwei and South of Hong Kong:
    North to northeast force 6 to 7, becoming force 8 later.
    Rough seas, becoming very rough later.

    Shangchuan Dao:
    North to northeast force 6 to 7, becoming force 8 later.
    Isolated squally showers and thunderstorms.
    Rough seas, becoming very rough later.

    Outlook for the next 48 hours
    North to northeasterly winds of force 7 to 8. Isolated squally showers and thunderstorms.

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

    Waglan Island Wind east-northeast force 4
      Visibility 21 Kilometres

    Shantou Wind east force 1
      Visibility 27 Kilometres

    Dongsha Wind northeast force 4
      Visibility 9 Kilometres in drizzle

    Huangmaozhou Wind northeast force 4

    Macau Wind southeast force 2
      Visibility 18 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 17:30 HKT 02/NOV/2017
    (Next update at 01:30 HKT 03/NOV/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE NORTHEAST MONSOON IS AFFECTING SOUTHERN
     CHINA. AT 4 P.M., TROPICAL STORM DAMREY WAS
     LOCATED NEAR 12.8 DEGREES NORTH, 116.2 DEGREES
     EAST. IT IS FORECAST TO MOVE WEST AT ABOUT 10
     KNOTS ACROSS THE SOUTHERN PART OF THE SOUTH
     CHINA SEA AND INTENSIFY GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  050/5-10
       OFFSHORE:  050/15, OCNL 20                      25-19
   B.   2000 FT:  060/10-15, UP TO 20 LATER            19
   C.   5000 FT:  050/15-20                            17
   D.  10000 FT:  120/10                               9
   E.  18000 FT:  200/10                               MS4
   F.  24000 FT:  230/15                               MS14
   G.  30000 FT:  250/30                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      3400-3900 FT
   I. WEATHER       : 
      MAINLY FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 4000 FT
   K. VISIBILITY    : 7 KM.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 8400 FT
   M. TURBULENCE    : MOD OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 1.5-2.0 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTH TO NORTHEASTERLY WINDS.
     MAINLY CLOUDY WITH A FEW RAIN PATCHES=

    ===================================================================
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 10:01 HKT on 01 Nov 17

    VHHK SIGMET Z99 VALID 010201/010211 VHHH- VHHK HONG KONG FIR THIS IS A TEST SIGMET, PLEASE DISREGARD. TEST TC ADVISORY NUMBER 01 RECEIVED FM TOKYO TCAC AT 010200Z= =

    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 00:30 HKT 03/Nov/2017


    Tropical Cyclone Warning

    At 021500 UTC, Severe Tropical Storm Damrey (1723) with central pressure 988 hectopascals was centred within 90 nautical miles of one two point eight degrees north (12.8 N) one one four point nine degrees east (114.9 E) and is forecast to move west at about 10 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 50 knots.

    Radius of over 33 knot winds 60 nautical miles.
    Radius of over 47 knot winds 30 nautical miles.
    Radius of over 2 metre waves 120 nautical miles.

    Forecast position and intensity at 031500 UTC
    One two point zero degrees north (12.0 N)
    One one one point one degrees east (111.1 E)
    Maximum winds 65 knots.

    Forecast position and intensity at 041500 UTC
    One two point zero degrees north (12.0 N)
    One zero six point zero degrees east (106.0 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 051500 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 03/Nov/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     27.8 C
Minimum Air Temperature                     20.9 C
Grass Minimum Temperature                   19.0 C
Relative Humidity                        47 - 82 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2540.9 mm
Against an average of                     2336.6 mm

Other Stations                Min                  Max
King's Park                  20.3 C               28.7 C
Wong Chuk Hang               18.5 C               28.5 C
Ta Kwu Ling                  15.0 C               29.3 C
Lau Fau Shan                 18.3 C               29.3 C
Tai Po                       18.3 C               27.2 C
Sha Tin                      17.3 C               28.2 C
Tuen Mun                     18.4 C               30.1 C
Tseung Kwan O                17.7 C               29.4 C
Sai Kung                     20.0 C               26.1 C
Cheung Chau                  19.4 C               27.4 C
Chek Lap Kok                 20.0 C               29.2 C
Tsing Yi                     18.9 C               29.2 C
Shek Kong                    16.6 C               29.9 C
Tsuen Wan Ho Koon            17.8 C               28.5 C
Tsuen Wan Shing Mun Valley   17.0 C               29.9 C
Shau Kei Wan                 20.2 C               28.5 C
Kowloon City                 20.0 C               29.3 C
Happy Valley                 18.2 C               29.1 C
Wong Tai Sin                 18.7 C               29.5 C
Kwun Tong                    19.7 C               28.3 C
Sham Shui Po                 19.0 C               29.6 C
Kai Tak Runway Park          20.5 C               28.3 C
Yuen Long Park               17.3 C               29.7 C
Tai Mei Tuk               19.1 C               28.8 C

Duration of sunshine (King's Park):              10.3 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.
Sea surface temperature (Waglan Island):        25.4 C 

Yesterday's (02 Nov 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 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                           0.08
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                           0.12
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 during
the period 1987-2016, the background ambient gamma radiation
levels may vary between 0.06 and 0.30 microsievert per hour.

    2. The extent of health effects to a person as a result of
exposure to radiation is expressed by a physical quantity
called equivalent dose, in unit of sievert.  Protective
action may be required if there is an increase in the
ambient gamma dose rate above background such that the total
additional dose is expected to exceed 5000 microsieverts in
a relatively short period of time. For example, a dose of
5000 microsieverts may be reached when the ambient gamma
dose rate is 1000 microsieverts per hour (several thousand
times above background) and lasts for 5 hours.

    3. The readings of ambient gamma radiation level from
instrument are expressed in unit of gray, which is
numerically equal to the gamma dose expressed in sievert.
    Climatological Information for 02 Nov
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