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Bulletin issued at 10:02 HKT 05/Nov/2017

At 10 a.m. at the Hong Kong Observatory the air temperature was 22 degrees Celsius and the relative humidity 60 per cent.
During the past hour the mean UV Index recorded at King's Park was 2. 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 21 degrees;
Wong Chuk Hang 23 degrees;
Ta Kwu Ling 22 degrees;
Lau Fau Shan 21 degrees;
Tai Po 22 degrees;
Sha Tin 22 degrees;
Tuen Mun 23 degrees;
Tseung Kwan O 22 degrees;
Sai Kung 21 degrees;
Cheung Chau 22 degrees;
Chek Lap Kok 23 degrees;
Tsing Yi 22 degrees;
Shek Kong 23 degrees;
Tsuen Wan Ho Koon 21 degrees;
Tsuen Wan Shing Mun Valley 23 degrees;
Hong Kong Park 22 degrees;
Shau Kei Wan 23 degrees;
Kowloon City 21 degrees;
Happy Valley 23 degrees;
Wong Tai Sin 21 degrees;
Stanley 22 degrees;
Kwun Tong 21 degrees;
Sham Shui Po 23 degrees;
Kai Tak Runway Park 22 degrees;
Yuen Long Park 24 degrees;
Tai Mei Tuk 23 degrees.


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


Climatological Information for 5 Nov

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 09:45 HKT 05/Nov/2017

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

A dry northeast monsoon is affecting southern China.

Weather forecast for today

Mainly fine and dry. Moderate to fresh northeasterly winds.

Outlook : Mainly cloudy in the next couple of days.


(The above forecast period is valid up to 23:59 HKT today, 05/11/2017; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

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Marine Weather Information and Forecast

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MARINE FORECAST
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Marine Forecast

Weather Information for the Marine Community

Bulletin issued at 09:00 HKT 05/Nov/2017

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

GENERAL SITUATION AT 042100 UTC:
AN INTENSE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 050100 UTC:

HONG KONG= NE 5-6. A FEW RAIN PATCHES. SEA 2-3 M. SWELL NE 2 M. TEMP 26-21 C. =
KWANGTUNG= NE 7-8. ISOL SHOWERS. SEA 4-6 M. SWELL NE 3-4 M. =
TAIWAN STRAIT= NE 7-8, 9 AT FIRST. ISOL SHOWERS. SEA 4-6 M, 8 M AT FIRST. SWELL NE 3-5 M. =
BASHI= NE 7-8, 9 AT FIRST. ISOL SHOWERS AND TS. SEA 4-6 M, 8 M AT FIRST. SWELL NE 3-5 M. =
PRATAS= NE 7-8. ISOL SHOWERS AND TS. SEA 4-6 M. SWELL NE 3-5 M. =
BALINTANG= NE 7-8, 9 AT FIRST. ISOL SHOWERS AND TS. SEA 4-6 M, 8 M AT FIRST. SWELL NE 3-5 M. =
SCARBOROUGH= NE 6-7, 8 AT FIRST. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M, 6 M AT FIRST. SWELL NE 3-5 M. =
PARACEL= NE 7-8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 4-6 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, OCNL 8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 6 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.


  • Map showing the 10 forecast areas
  • Tidal Information

    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

    Current Weather | Local Weather Forecast | Regional Temperature Forecast in HK
    9-day Weather Forecast | UV Index Forecast | Weather Information for Fishermen

    Bulletin issued at 09:30 HKT 05/Nov/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 05 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.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Northeast force 5 to 6.
    A few rain patches later.
    Moderate to rough seas.

    Nan'ao:
    Northeast force 7 to 8, occasionally up to force 9.
    Rough to very rough seas.

    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 4
      Visibility 6 Kilometres

    Shantou Wind north-northeast force 1
      Visibility 20 Kilometres

    Dongsha Wind northeast force 5
      Visibility 10 Kilometres

    Huangmaozhou Wind northeast force 5

    Macau Wind north-northeast force 4
      Visibility 6 Kilometres

    Xisha Wind east-northeast force 4
      Visibility 10 Kilometres in showers

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
  • Descriptive Terms of Wind Speeds
  • Visibility Readings in Hong Kong Waters
  • Map showing forecast areas
  • Tidal Information

    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 09:30 HKT 05/NOV/2017
    (Next update at 17:30 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 THE SOUTH
     CHINA COASTAL WATERS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  050/10-15
       OFFSHORE:  070/20-25                            23-28
   B.   2000 FT:  060/15-20                            17
   C.   5000 FT:  080/20                               16
   D.  10000 FT:  120/15                               7
   E.  18000 FT:  210/10                               MS6
   F.  24000 FT:  230/20                               MS16
   G.  30000 FT:  230/30                               MS30
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      3700-4800FT
   I. WEATHER       : 
      MAINLY FINE. LOCALISED HAZE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 4000 FT
   K. VISIBILITY    : 10 KM. TEMPO 4000M IN HAZE.
   L. 0 DEG. C LEVEL: 16000 FT      10 DEG. C LEVEL(S) : 8800 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 2.5-3.5 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTHEASTERLY WINDS, FRESH OFFSHORE.
     MAINLY 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.

    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

    Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
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    South China Coastal Waters |  Marine Forecast
    Severe Weather Information Centre

    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 05/Nov/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     25.8 C
Minimum Air Temperature                     20.7 C
Grass Minimum Temperature                   19.2 C
Relative Humidity                        46 - 80 Percent
Rainfall                                     0.3 mm 
Total rainfall since 1st January          2541.2 mm
Against an average of                     2341.9 mm

Other Stations                Min                  Max
King's Park                  20.6 C               25.8 C
Wong Chuk Hang               21.5 C               25.8 C
Ta Kwu Ling                  20.0 C               26.5 C
Lau Fau Shan                 21.6 C               25.7 C
Tai Po                       20.6 C               24.9 C
Sha Tin                      20.4 C               26.3 C
Tuen Mun                     22.7 C               26.0 C
Tseung Kwan O                18.1 C               25.4 C
Sai Kung                     20.7 C               25.2 C
Cheung Chau                  21.6 C               25.3 C
Chek Lap Kok                 23.5 C               27.8 C
Tsing Yi                     22.9 C               26.2 C
Shek Kong                    21.4 C               27.2 C
Tsuen Wan Ho Koon            20.8 C               24.7 C
Tsuen Wan Shing Mun Valley   20.6 C               25.7 C
Hong Kong Park               21.4 C               25.6 C
Shau Kei Wan                 20.1 C               25.9 C
Kowloon City                 20.1 C               26.2 C
Happy Valley                 20.3 C               25.9 C
Wong Tai Sin                 19.9 C               26.7 C
Stanley                      20.0 C               25.6 C
Kwun Tong                    19.4 C               25.2 C
Sham Shui Po                 21.5 C               27.5 C
Kai Tak Runway Park          21.4 C               25.7 C
Yuen Long Park               22.8 C               27.3 C
Tai Mei Tuk               20.6 C               25.7 C

Duration of sunshine (King's Park):              1.5 H
The mean UV index recorded at King's Park yesterday was 2,
the UV intensity was Low.
The maximum UV index for yesterday was 6.
Sea surface temperature (Waglan Island):        25.0 C 

Yesterday's (04 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 04 Nov
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