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Bulletin issued at 18:02 HKT 04/Nov/2017

At 6 p.m. at the Hong Kong Observatory the air temperature was 24 degrees Celsius and the relative humidity 52 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.0. The intensity of UV radiation was low.

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 24 degrees;
Wong Chuk Hang 25 degrees;
Ta Kwu Ling 24 degrees;
Lau Fau Shan 23 degrees;
Tai Po 25 degrees;
Sha Tin 25 degrees;
Tuen Mun 25 degrees;
Tseung Kwan O 23 degrees;
Sai Kung 25 degrees;
Cheung Chau 24 degrees;
Chek Lap Kok 26 degrees;
Tsing Yi 25 degrees;
Shek Kong 25 degrees;
Tsuen Wan Ho Koon 23 degrees;
Tsuen Wan Shing Mun Valley 23 degrees;
Hong Kong Park 24 degrees;
Shau Kei Wan 24 degrees;
Kowloon City 24 degrees;
Happy Valley 25 degrees;
Wong Tai Sin 24 degrees;
Stanley 24 degrees;
Kwun Tong 24 degrees;
Sham Shui Po 25 degrees;
Kai Tak Runway Park 25 degrees;
Yuen Long Park 25 degrees;
Tai Mei Tuk 24 degrees.

Here is the information on Severe Tropical Storm Damrey at 4 p.m.:
Location: 12.5 degrees north, 107.7 degrees east.


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


Climatological Information for 4 Nov

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 17:45 HKT 04/Nov/2017

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

A dry northeast monsoon is affecting southern China. Meanwhile, a broad band of clouds is covering the coastal areas of Guangdong. Locally, the relative humidity over many places stayed around 50 per cent in the afternoon.

At 4 p.m., Severe Tropical Storm Damrey was centred about 220 kilometres north-northeast of Ho Chi Minh City. It is forecast to move west at about 22 kilometres per hour across Indo-China and dissipate gradually.

Weather forecast for tonight and tomorrow

Mainly cloudy. Dry with sunny periods tomorrow. Temperatures will range between 20 and 26 degrees. Moderate to fresh northeasterly winds, occasionally strong offshore and on high ground at first.

Outlook : Mainly cloudy in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 05/11/2017; 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 04/Nov/2017

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

GENERAL SITUATION AT 032100 UTC:
FOR DETAILS ON TYPHOON DAMREY (1723), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS. AN INTENSE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 040100 UTC:

HONG KONG= NE 6-7, OCNL 8. A FEW RAIN PATCHES. SEA UP TO 6 M. SWELL NE 2 M. TEMP 25-20 C. =
KWANGTUNG= NE 7-8. ISOL SHOWERS. SEA 4-6 M. SWELL NE 3 M. =
TAIWAN STRAIT= NE 8-9. ISOL SHOWERS. SEA 6-8 M. SWELL NE 3-5 M. =
BASHI= NE 8-9. ISOL SHOWERS. SEA 6-8 M. SWELL NE 3-5 M. =
PRATAS= NE 7-8. ISOL SHOWERS. SEA 4-6 M. SWELL NE 3-5 M. =
BALINTANG= NE 8-9. ISOL SHOWERS. SEA 6-8 M. SWELL NE 3-5 M. =
SCARBOROUGH= NE 7-8. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 3-5 M. =
PARACEL= NE 7-8, 9 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 4-6 M, 8 M AT FIRST. SWELL NE 3-5 M. =
TONKIN= NE 6-7, 8 AT FIRST. ISOL SHOWERS. SEA 3-4 M, 6 M AT FIRST. SWELL NE 2-3 M. =
DANANG= NE 7-8. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 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 16:30 HKT 04/Nov/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 04 November 2017

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

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

    At 4 p.m., Severe Tropical Storm Damrey with maximum sustained winds of about 105 kilometres per hour near its centre was located at 12.5 degrees north, 107.7 degrees east. It is forecast to move west at about 22 kilometres per hour across Indo-China and dissipate gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Northeast force 6 to 7.
    Rough seas.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    Northeast force 7 to 8.
    Rough to very rough seas.

    Outlook for the next 48 hours
    Northeasterly winds of force 6 to 7, force 8 at first. Isolated squally showers and thunderstorms.

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

    Waglan Island Wind northeast force 5
      Visibility 14 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 18 Kilometres

    Dongsha Wind northeast force 6
      Visibility 10 Kilometres

    Huangmaozhou Wind northeast force 5

    Macau Wind north-northeast force 4
      Visibility 11 Kilometres

    Xisha Wind east-northeast force 3
      Visibility 8 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 04/NOV/2017
    (Next update at 01:30 HKT 05/NOV/2017)
    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 SOUTHERN
     CHINA.
     AT 4 P.M., SEVERE TROPICAL STORM DAMREY WAS
     LOCATED NEAR 12.5 DEGREES NORTH, 107.7 DEGREES
     EAST. IT IS FORECAST TO MOVE WEST AT ABOUT 12
     KNOTS ACROSS INDO-CHINA AND DISSIPATE GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  060/10-15
       OFFSHORE:  060/20-25, OCNL 30                   26-20
   B.   2000 FT:  040/20-25, OCNL 30                   18
   C.   5000 FT:  080/25-30                            14
   D.  10000 FT:  100/10                               8
   E.  18000 FT:  180/15                               MS5
   F.  24000 FT:  240/25-30                            MS16
   G.  30000 FT:  220/25-30                            MS31
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      MAINLY CLOUDY.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 4000 FT.
   K. VISIBILITY    : 9 KM.
   L. 0 DEG. C LEVEL: 15000 FT      10 DEG. C LEVEL(S) : 9200 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND NEAR HILLS
   N. SEA STATE     : 2.5-4.0 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTHEASTERLY WINDS,
     OCCASIONALLY STRONG OFFSHORE AND ON HIGH GROUND.
     SUNNY PERIODS.=

    ===================================================================
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 12:35 HKT on 03 Nov 17

    VHHK SIGMET 1 VALID 030040/030440 VHHH- VHHK HONG KONG FIR EMBD TS FCST S OF N1818 TOP FL450 MOV W 10KT NC= VHHK SIGMET 2 VALID 030440/030840 VHHH- VHHK HONG KONG FIR EMBD TS FCST S OF N18 TOP FL450 MOV W 10KT 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 18:30 HKT 04/Nov/2017


    Tropical Cyclone Warning

    Severe Tropical Storm Damrey (1723) has weakened into a Tropical Storm with central pressure 988 hectopascals. At 040900 UTC, it was centred within 60 nautical miles of one two point five degrees north (12.5 N) one zero seven point four degrees east (107.4 E) and is forecast to move west at about 12 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 45 knots.

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

    No further warnings on this Tropical Storm will be issued by the Hong Kong Observatory unless re-intensification takes place.

    Forecast position and intensity at 050900 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 04/Nov/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     27.6 C
Minimum Air Temperature                     22.0 C
Grass Minimum Temperature                   19.6 C
Relative Humidity                        44 - 82 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2540.9 mm
Against an average of                     2338.6 mm

Other Stations                Min                  Max
King's Park                  22.0 C               28.2 C
Wong Chuk Hang               21.1 C               29.4 C
Ta Kwu Ling                  15.8 C               29.0 C
Lau Fau Shan                 19.2 C               29.6 C
Tai Po                       19.2 C               27.5 C
Sha Tin                      19.0 C               28.5 C
Tuen Mun                     20.5 C               29.1 C
Tseung Kwan O                20.0 C               29.4 C
Sai Kung                     21.6 C               27.5 C
Cheung Chau                  20.3 C               28.1 C
Chek Lap Kok                 21.2 C               30.3 C
Tsing Yi                     20.4 C               29.2 C
Shek Kong                    17.7 C               29.2 C
Tsuen Wan Ho Koon            19.1 C               27.1 C
Tsuen Wan Shing Mun Valley   18.4 C               29.0 C
Hong Kong Park               21.2 C               29.1 C
Shau Kei Wan                 21.3 C               29.4 C
Kowloon City                 21.4 C               28.3 C
Happy Valley                 21.0 C               29.8 C
Wong Tai Sin                 21.5 C               29.2 C
Stanley                      22.2 C               29.4 C
Kwun Tong                    20.9 C               28.5 C
Sham Shui Po                 21.1 C               30.5 C
Kai Tak Runway Park          22.3 C               28.6 C
Yuen Long Park               18.9 C               30.3 C
Tai Mei Tuk               20.5 C               28.2 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 7.
Sea surface temperature (Waglan Island):        25.3 C 

Yesterday's (03 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                      0.14
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 03 Nov
     2003copy right image | Important notices | Privacy policy Last revision date: <04 Nov 2017> 

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