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

At midnight at the Hong Kong Observatory the air temperature was 22 degrees Celsius and the relative humidity 78 per cent.

The air temperatures at other places were:

King's Park 21 degrees;
Wong Chuk Hang 20 degrees;
Ta Kwu Ling 18 degrees;
Lau Fau Shan 20 degrees;
Tai Po 20 degrees;
Sha Tin 19 degrees;
Tuen Mun 20 degrees;
Tseung Kwan O 19 degrees;
Sai Kung 21 degrees;
Cheung Chau 21 degrees;
Chek Lap Kok 23 degrees;
Tsing Yi 22 degrees;
Shek Kong 19 degrees;
Tsuen Wan Ho Koon 19 degrees;
Tsuen Wan Shing Mun Valley 19 degrees;
Hong Kong Park 21 degrees;
Shau Kei Wan 21 degrees;
Kowloon City 21 degrees;
Happy Valley 21 degrees;
Wong Tai Sin 21 degrees;
Stanley 22 degrees;
Kwun Tong 21 degrees;
Sham Shui Po 21 degrees;
Kai Tak Runway Park 23 degrees;
Yuen Long Park 20 degrees;
Tai Mei Tuk 21 degrees.

Here is the information on Tropical Depression at 11:00 p.m. yesterday:
Location: 11.9 degrees north, 118.9 degrees east.


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


Climatological Information for 2 Nov

Regional Weather in Hong Kong

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Bulletin updated at 00:00 HKT 02/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, the weather was fine and dry. It was cooler in the morning. The monsoon will continue to moderate today and a replenishment of the northeast monsoon will reach the south China coast tomorrow. It will be cloudier and windier over the region during the weekend.

Besides, the area of low pressure west of the Philippines intensified into a tropical depression yesterday. At 11 p.m. last night, the tropical depression was centred about 520 kilometres east-northeast of Nansha Dao. It is forecast to move west at about 20 kilometres per hour across the southern part of the South China Sea. Meanwhile, the tropical depression over the seas south of Vietnam was centred about 360 kilometres south of Ho Chi Minh City. It is forecast to move west slowly towards the Gulf of Thailand.

Weather forecast for Hong Kong (Thursday, 2 Nov 2017)

It will be fine. The minimum temperature in the morning will be about 21 degrees in the urban areas, and a couple of degrees lower in the New Territories. Dry during the day with a maximum temperature of around 28 degrees. Moderate northeasterly winds.

Outlook : Becoming cloudy with a few rain patches in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 02/11/2017; 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 01/Nov/2017

N0 WARNING.

GENERAL SITUATION AT 010900 UTC:
THE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS. FOR DETAILS ON TROPICAL DEPRESSION NEAR THE PHILIPPINES, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 011300 UTC:

HONG KONG= NE 5-6. FINE. SEA 2-3 M. SWELL NE 2 M. TEMP 21-28 C. =
KWANGTUNG= NE 6-7. FINE. SEA 3-4 M. SWELL NE 2-3 M. =
TAIWAN STRAIT= NE 5-6, OCNL 7. FINE. SEA 3 M. SWELL NE 2-3 M. =
BASHI= NE 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL NE 3 M. =
PRATAS= NE 6-7. ISOL SHOWERS. SEA 3-4 M. SWELL NE 3 M. =
BALINTANG= NE 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL NE 3-4 M. =
SCARBOROUGH= NE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 3-4 M. =
PARACEL= NE 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL NE 3-4 M. =
TONKIN= NE 5-6. RAIN PATCHES. SEA 2-3 M. SWELL NE 2 M. =
DANANG= NE 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL NE 3-4 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 01/Nov/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 01 November 2017

    Warnings:
    Strong winds in all areas.

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

    At 11 p.m., the tropical depression west of the Philippines with maximum sustained winds of about 45 kilometres per hour near its centre was located near 11.9 degrees north, 118.9 degrees east. It is forecast to move west at about 20 kilometres per hour across the southern part of the South China Sea.

    Area forecasts for the next 24 hours

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

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    Northeast force 6 to 7.
    Rough seas.

    Outlook for the next 48 hours
    North to northeasterly winds of force 6 to 7, up to force 8 later. Isolated showers and thunderstorms later.

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

    Waglan Island Wind northeast force 4
      Visibility 23 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 30 Kilometres

    Dongsha Wind northeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind northeast force 4

    Macau Wind southeast force 1
      Visibility 19 Kilometres

    Xisha Wind northeast force 3
      Visibility 14 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 01/NOV/2017
    (Next update at 01:30 HKT 02/NOV/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A DRY NORTHEAST MONSOON CONTINUES TO BRING FINE
     WEATHER TO SOUTHERN CHINA. AT 4 P.M., TROPICAL
     DEPRESSION NEAR THE PHILIPPINES WAS LOCATED NEAR
     11.6 DEGREES NORTH, 120.4 DEGREES EAST. IT IS
     FORECAST TO MOVE WEST AT ABOUT 11 KNOTS TOWARDS
     THE SOUTHERN PART 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:  080/5-10
       OFFSHORE:  070/15                               24-20
   B.   2000 FT:  060/10-15, OCNL 20                   17
   C.   5000 FT:  040/10-15                            16
   D.  10000 FT:  340/15                               7
   E.  18000 FT:  250/15                               MS4
   F.  24000 FT:  240/15                               MS15
   G.  30000 FT:  260/20                               MS30
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      4100-4900 FT
   I. WEATHER       : 
      FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      NO CLOUDS OF HEIGHT AT OR BELOW 10,000 FT.
   K. VISIBILITY    : 10 KM.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 9200 FT
   M. TURBULENCE    : MOD OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT TO MODERATE EAST TO NORTHEASTERLY WINDS.
     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.

    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 02/Nov/2017


    Tropical Cyclone Warning

    At 011500 UTC, Tropical Depression to the west of the Philippines with central pressure 1002 hectopascals was centred within 90 nautical miles of one two point zero degrees north (12.0 N) one one eight point seven degrees east (118.7 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 25 knots.

    Radius of over 2 metre waves 60 nautical miles.

    Forecast position and intensity at 021500 UTC
    One two point five degrees north (12.5 N)
    One one four point eight degrees east (114.8 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 031500 UTC
    One one point nine degrees north (11.9 N)
    One one one point zero degrees east (111.0 E)
    Maximum winds 55 knots.

    Forecast position and intensity at 041500 UTC
    One two point two degrees north (12.2 N)
    One zero seven point one degrees east (107.1 E)
    Maximum winds 25 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 02/Nov/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     26.4 C
Minimum Air Temperature                     20.5 C
Grass Minimum Temperature                   19.0 C
Relative Humidity                        47 - 78 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2540.9 mm
Against an average of                     2334.6 mm

Other Stations                Min                  Max
King's Park                  20.1 C               26.7 C
Wong Chuk Hang               20.3 C               27.3 C
Ta Kwu Ling                  15.3 C               27.8 C
Lau Fau Shan                 17.5 C               27.2 C
Tai Po                       19.0 C               25.7 C
Sha Tin                      18.6 C               26.7 C
Tuen Mun                     19.1 C               27.8 C
Tseung Kwan O                18.5 C               27.4 C
Sai Kung                     19.9 C               25.2 C
Cheung Chau                  20.4 C               26.8 C
Chek Lap Kok                 21.1 C               27.9 C
Tsing Yi                     20.7 C               27.8 C
Shek Kong                    18.2 C               28.0 C
Tsuen Wan Ho Koon            18.6 C               26.5 C
Tsuen Wan Shing Mun Valley   19.3 C               28.4 C
Hong Kong Park               20.4 C               27.2 C
Shau Kei Wan                 19.7 C               26.2 C
Kowloon City                 19.6 C               27.2 C
Happy Valley                 20.6 C               28.6 C
Wong Tai Sin                 20.1 C               28.1 C
Stanley                      21.0 C               26.2 C
Kwun Tong                    19.7 C               26.6 C
Sham Shui Po                 19.8 C               28.3 C
Kai Tak Runway Park          20.9 C               27.0 C
Yuen Long Park               18.6 C               28.5 C
Tai Mei Tuk               19.6 C               26.2 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 7.
Sea surface temperature (Waglan Island):        25.4 C 

Yesterday's (01 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                        0.14

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 01 Nov
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