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Bulletin issued at 09:02 HKT 01/Nov/2017

At 9 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 1. The intensity of UV radiation was low.

The air temperatures at other places were:

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

Between midnight and 9 a.m. the minimum temperature was 20.5 degrees Celsius at the Hong Kong Observatory.

Here is the information on Tropical Depression at 9 a.m.:
Location: 11.4 degrees north, 120.6 degrees east.


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


Climatological Information for 1 Nov

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 08:45 HKT 01/Nov/2017

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

The northeast monsoon continues to bring fine weather to southern China.

At 8 a.m., the tropical depression near the Philippines was centred about 700 kilometres east of Nansha Dao. It is forecast to move west at about 20 kilometres per hour towards 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 today

It will be fine. Cooler in the morning. Dry during the day with a maximum temperature of around 26 degrees. Moderate east to northeasterly winds.

Outlook : Mainly fine and dry in the next couple of days. Slightly cloudier during the weekend.


(The above forecast period is valid up to 23:59 HKT today, 01/11/2017; 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 09:00 HKT 01/Nov/2017

GALE WARNING AREAS: BALINTANG AND SCARBOROUGH.

GENERAL SITUATION AT 312100 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 010100 UTC:

HONG KONG= E TO NE 5-6. FINE. SEA 2-3 M. SWELL NE 2-3 M. TEMP 26-21 C. =
KWANGTUNG= NE 6-7. FINE. SEA 3-4 M. SWELL NE 3 M. =
TAIWAN STRAIT= NE 6-7. FINE. SEA 3-4 M. SWELL NE 3 M. =
BASHI= NE 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL NE 3 M. =
PRATAS= NE 6-7. ISOL SHOWERS LATER. SEA 3-4 M. SWELL NE 3 M. =
BALINTANG= NE 6-7, OCNL 8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL NE 3-5 M. =
SCARBOROUGH= NE 6-7, OCNL 8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL NE 3-5 M. =
PARACEL= NE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 3-5 M. =
TONKIN= NE 6-7. ISOL SHOWERS. SEA 3-4 M. SWELL NE 2-3 M. =
DANANG= NE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 3-5 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 09:30 HKT 01/Nov/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 01 November 2017

    Warnings:
    Strong winds in all areas.

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

    At 9 a.m., the tropical depression near the Philippines with maximum sustained winds of about 45 kilometres per hour near its centre was located near 11.4 degrees north, 120.6 degrees east. It is forecast to move west at about 20 kilometres per hour towards the southern part of the South China Sea.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to northeast force 5 to 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
    Northeasterly winds of force 6 to 7, becoming force 8 later. Isolated squally showers and thunderstorms later.

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

    Waglan Island Wind north-northeast force 4
      Visibility 22 Kilometres

    Dongsha Wind northeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind northeast force 4

    Macau Wind east-northeast force 2

    Xisha Wind northeast force 3
      Visibility 14 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 09:00 HKT 01/NOV/2017
    (Next update at 17:30 HKT 01/NOV/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN INTENSE NORTHEAST MONSOON IS AFFECTING THE
     SOUTH CHINA COASTAL AREAS. AT 8 A.M., TROPICAL
     DEPRESSION NEAR THE PHILIPPINES WAS LOCATED NEAR
     11.4 DEGREES NORTH, 120.7 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 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  060/5-10
       OFFSHORE:  070/15                               22-27
   B.   2000 FT:  060/10-15, OCNL 20                   16
   C.   5000 FT:  040/10-15                            15
   D.  10000 FT:  340/25                               8
   E.  18000 FT:  250/15                               MS2
   F.  24000 FT:  240/10                               MS14
   G.  30000 FT:  260/20                               MS28
   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    : 7 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     : 1.5-2.0 M     SEA TEMPERATURE    : 26 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 02:56 HKT on 16 Oct 17

    VHHK SIGMET 10 VALID 151500/151900 VHHH- VHHK HONG KONG FIR SEV TURB FCST W OF E115 FL340/400 STNR NC= VHHK SIGMET 11 VALID 151900/152300 VHHH- VHHK HONG KONG FIR SEV TURB FCST W OF E115 FL340/400 STNR NC=

    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 09:30 HKT 01/Nov/2017


    Tropical Cyclone Warning

    At 010000 UTC, Tropical Depression near the Philippines with central pressure 1002 hectopascals was centred within 90 nautical miles of one one point four degrees north (11.4 N) one two zero point seven degrees east (120.7 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 020000 UTC
    One one point nine degrees north (11.9 N)
    One one six point six degrees east (116.6 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 030000 UTC
    One one point six degrees north (11.6 N)
    One one three point one degrees east (113.1 E)
    Maximum winds 55 knots.

    Forecast position and intensity at 040000 UTC
    One one point eight degrees north (11.8 N)
    One zero nine point one degrees east (109.1 E)
    Maximum winds 55 knots.

    Forecast position and intensity at 050000 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 01/Nov/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     25.0 C
Minimum Air Temperature                     19.0 C
Grass Minimum Temperature                   17.9 C
Relative Humidity                        47 - 70 Percent
Rainfall                                      trace 
Total rainfall since 1st January          2540.9 mm
Against an average of                     2334.0 mm

Other Stations                Min                  Max
King's Park                  18.5 C               25.4 C
Wong Chuk Hang               19.1 C               24.7 C
Ta Kwu Ling                  13.9 C               25.5 C
Lau Fau Shan                 17.5 C               25.0 C
Tai Po                       16.5 C               23.6 C
Sha Tin                      18.5 C               24.8 C
Tuen Mun                     18.2 C               26.1 C
Tseung Kwan O                17.5 C               25.5 C
Sai Kung                     18.4 C               23.0 C
Cheung Chau                  18.1 C               25.6 C
Chek Lap Kok                 19.3 C               25.9 C
Tsing Yi                     19.5 C               25.8 C
Shek Kong                    17.3 C               26.1 C
Tsuen Wan Ho Koon            16.4 C               24.7 C
Tsuen Wan Shing Mun Valley   17.2 C               25.8 C
Hong Kong Park               19.0 C               24.4 C
Shau Kei Wan                 18.0 C               24.0 C
Kowloon City                 17.7 C               25.9 C
Happy Valley                 19.2 C               26.4 C
Wong Tai Sin                 17.9 C               26.2 C
Stanley                      18.9 C               24.6 C
Kwun Tong                    17.8 C               24.8 C
Sham Shui Po                 18.7 C               26.7 C
Kai Tak Runway Park          19.5 C               25.0 C
Yuen Long Park               18.1 C               26.9 C
Tai Mei Tuk               18.1 C               24.1 C

Duration of sunshine (King's Park):              10.1 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):        25.3 C 

Yesterday's (31 Oct 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 31 Oct
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