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Bulletin issued at 01:02 HKT 22/Oct/2017

At 1 a.m. at the Hong Kong Observatory the air temperature was 21 degrees Celsius and the relative humidity 63 per cent.

Please be reminded that:

The Fire Danger Warning is Yellow and the fire risk is high.

The air temperatures at other places were:

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


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


Climatological Information for 22 Oct

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 00:45 HKT 22/Oct/2017

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

The northeast monsoon continued to affect the coast of Guangdong yesterday. Locally, it was sunny and dry. The relative humidity over the territory fell below 60 per cent in the afternoon. The dry northeast monsoon is expected to continue to bring generally fine weather to Guangdong in the next few days. The temperature difference between day and night will be relatively large over the region.

Besides, Lan intensified from a severe typhoon into a super typhoon yesterday. At 11 p.m. last night, Lan was centred about 540 kilometres east-southeast of Okinawa. It is forecast to move north-northeast at about 30 kilometres per hour across the seas east of the Ryukyu Islands.

Weather forecast for Hong Kong

It will be fine. Slightly cooler in the morning and at night with a minimum temperature of around 21 degrees. Very dry during the day. The maximum temperature will be about 27 degrees. Moderate northerly winds, fresh at times.

Outlook : Remaining fine and dry in the following few days. Slightly cooler in the morning and at night on Monday.


(The above forecast period is valid up to 23:59 HKT today, 22/10/2017; 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 21/Oct/2017

GALE WARNING AREAS: KWANGTUNG, TAIWAN STRAIT, BASHI AND BALINTANG.

GENERAL SITUATION AT 210900 UTC:
THE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS. SUPER TYPHOON LAN (1721) 925 HPA 23N 132E NNE 15 KT INTST NC.

MARINE FORECAST FOR 24 HOURS FROM 211300 UTC:

HONG KONG= N 5-6. FINE. SEA 2-3 M. SWELL NE 2 M. TEMP 21-27 C. =
KWANGTUNG= N TO NE 6-7, OCNL 8 IN E. FINE. SEA 3-4 M, UP TO 6 M IN E. SWELL NE 2-5 M. =
TAIWAN STRAIT= N TO NE 7-8, OCNL 9. FINE. SEA UP TO 8 M. SWELL N TO NE 5-7 M. =
BASHI= N 7-8. ISOL SHOWERS AND TS. SEA 4-6 M. SWELL N TO NE 5-7 M. =
PRATAS= N 6-7. FINE. SEA 3-4 M. SWELL NE 3-5 M. =
BALINTANG= N 6-7, OCNL 8. ISOL SHOWERS AND TS. SEA UP TO 6 M. SWELL N TO NE 5-7 M. =
SCARBOROUGH= N 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL N TO NE 3 M. =
PARACEL= N TO NE 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL NE 2-3 M. =
TONKIN= N TO NE 5-6. FINE. SEA 2-3 M. SWELL NE 2 M. =
DANANG= N TO NE 5, OCNL 6. ISOL SHOWERS. SEA UP TO 3 M. SWELL NE 2-3 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.


  • 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
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    Bulletin issued at 23:30 HKT 21/Oct/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 21 October 2017

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

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

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North force 5 to 6.
    Moderate to rough seas.

    Nan'ao:
    North force 6 to 7, occasionally force 8.
    Rough to very rough seas.

    Shanwei and South of Hong Kong:
    North force 6 to 7.
    Rough seas.

    Shangchuan Dao:
    North to northeast force 5 to 6.
    Moderate to rough seas.

    Outlook for the next 48 hours
    Northeasterly winds of force 6 to 7.

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

    Waglan Island Wind north force 6
      Visibility 15 Kilometres

    Shantou Wind northeast force 1
      Visibility 28 Kilometres

    Dongsha Wind northeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind north-northeast force 5

    Xisha Wind north-northeast force 3
      Visibility 15 Kilometres

  • Explanation of Seas or Sea Waves
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  • Map showing forecast areas
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 22/OCT/2017
    (Next update at 9:00-9:30 HKT 22/OCT/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE NORTHEAST MONSOON IS AFFECTING THE COAST OF
     GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  020/10
       OFFSHORE:  020/15, OCNL 20                      20-26
   B.   2000 FT:  020/15-20                            16
   C.   5000 FT:  020/10                               14
   D.  10000 FT:  330/10                               10
   E.  18000 FT:  320/15                               MS4
   F.  24000 FT:  320/20                               MS12
   G.  30000 FT:  320/25                               MS29
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      3600-4600 FT
   I. WEATHER       : 
      FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 4000 FT
   K. VISIBILITY    : 10 KM
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 10800 FT
   M. TURBULENCE    : MOD OFFSHORE AND  NEAR HILLS
   N. SEA STATE     : 1.0-2.0 M     SEA TEMPERATURE    : 26 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTHERLY WINDS, FRESH AT TIMES. 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 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

    There is no tropical cyclone warning for shipping*.




    *Tropical cyclone warnings for shipping are issued by the Hong Kong Observatory for tropical cyclones located within the area bounded by 105E and 125E , 10N and 30N.




    For other tropical cyclone related information, please visit the World Meteorological Organization Web Site - Severe Weather Information Centre.

    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 22/Oct/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     27.2 C
Minimum Air Temperature                     21.6 C
Grass Minimum Temperature                   21.4 C
Relative Humidity                        56 - 72 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2540.9 mm
Against an average of                     2319.5 mm

Other Stations                Min                  Max
King's Park                  21.2 C               26.7 C
Wong Chuk Hang               22.0 C               28.3 C
Ta Kwu Ling                  20.6 C               27.0 C
Lau Fau Shan                 20.3 C               30.0 C
Tai Po                       20.6 C               26.4 C
Sha Tin                      21.5 C               27.0 C
Tuen Mun                     21.1 C               27.7 C
Tseung Kwan O                19.5 C               28.2 C
Sai Kung                     21.6 C               25.3 C
Cheung Chau                  20.6 C               28.3 C
Chek Lap Kok                 22.2 C               27.7 C
Tsing Yi                     21.2 C               27.8 C
Shek Kong                    20.0 C               27.3 C
Tsuen Wan Ho Koon            19.9 C               25.7 C
Tsuen Wan Shing Mun Valley   18.9 C               28.4 C
Hong Kong Park               21.5 C               28.4 C
Shau Kei Wan                 20.8 C               28.1 C
Kowloon City                 20.9 C               27.6 C
Happy Valley                 21.8 C               28.4 C
Wong Tai Sin                 21.0 C               28.1 C
Stanley                      21.4 C               28.6 C
Kwun Tong                    20.4 C               28.0 C
Sham Shui Po                 21.5 C               28.0 C
Kai Tak Runway Park          21.7 C               27.4 C
Yuen Long Park               21.6 C               28.6 C
Tai Mei Tuk               20.5 C               26.4 C

Duration of sunshine (King's Park):              10.5 H
The mean UV index recorded at King's Park yesterday was 4,
the UV intensity was Moderate.
The maximum UV index for yesterday was 7.
Sea surface temperature (Waglan Island):        26.5 C 

Yesterday's (21 Oct 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 to
0.14 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                               0.09
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                         0.14
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 21 Oct
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