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Bulletin issued at 11:02 HKT 31/Dec/2017

At 11 a.m. at the Hong Kong Observatory the air temperature was 18 degrees Celsius and the relative humidity 57 per cent.
During the past hour the mean UV Index recorded at King's Park was 3. The intensity of UV radiation was moderate.

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 18 degrees;
Wong Chuk Hang 20 degrees;
Ta Kwu Ling 18 degrees;
Lau Fau Shan 18 degrees;
Tai Po 19 degrees;
Sha Tin 19 degrees;
Tuen Mun 19 degrees;
Tseung Kwan O 20 degrees;
Sai Kung 17 degrees;
Cheung Chau 19 degrees;
Chek Lap Kok 18 degrees;
Tsing Yi 18 degrees;
Shek Kong 19 degrees;
Tsuen Wan Ho Koon 17 degrees;
Tsuen Wan Shing Mun Valley 19 degrees;
Hong Kong Park 19 degrees;
Shau Kei Wan 19 degrees;
Kowloon City 20 degrees;
Happy Valley 20 degrees;
Wong Tai Sin 19 degrees;
Stanley 19 degrees;
Kwun Tong 19 degrees;
Sham Shui Po 20 degrees;
Kai Tak Runway Park 20 degrees;
Yuen Long Park 18 degrees;
Tai Mei Tuk 20 degrees.


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


Climatological Information for 31 Dec

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 10:45 HKT 31/Dec/2017

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

A dry northeast monsoon is affecting Guangdong.

Weather forecast for today

Mainly fine and dry. Moderate to fresh north to northeasterly winds, becoming easterlies tonight.

Outlook : Mainly fine with cool morning on New Year's Day. Becoming cloudier gradually midweek this week.


(The above forecast period is valid up to 23:59 HKT today, 31/12/2017; 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 31/Dec/2017

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

GENERAL SITUATION AT 302100 UTC:
AN INTENSE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 310100 UTC:

HONG KONG= N TO NE 6-7. FINE. SEA 3-4 M. SWELL E 2 M. TEMP 20-16 C. =
KWANGTUNG= N TO NE 6-7, OCNL 8 IN E. FINE. SEA 3-4 M, UP TO 6 M IN E. SWELL NE 2-3 M. =
TAIWAN STRAIT= N TO NE 7-8. FINE. SEA 4-6 M. SWELL NE 2-3 M. =
BASHI= N TO NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL NE 2-3 M. =
PRATAS= N TO NE 7, OCNL 8. FINE. SEA UP TO 6 M. SWELL NE 2-3 M. =
BALINTANG= N TO NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL NE 3 M. =
SCARBOROUGH= N TO NE 7-8. ISOL SHOWERS. SEA 4-6 M. SWELL NE 3 M. =
PARACEL= N TO NE 7-8. ISOL SHOWERS. SEA 4-6 M. SWELL NE 2-3 M. =
TONKIN= N TO NE 6-7. RAIN PATCHES. SEA 3-4 M. SWELL NE 2 M. =
DANANG= N TO NE 6-7. RAIN PATCHES. SEA 3-4 M. SWELL NE 2 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 31/Dec/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 31 December 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 to northeast force 6 to 7.
    Rough seas.

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

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

    Shangchuan Dao:
    North to northeast force 6 to 7.
    Rough seas.

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

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

    Waglan Island Wind north force 5

    Shantou Wind north-northwest force 1
      Visibility 27 Kilometres

    Dongsha Wind northeast force 5
      Visibility 10 Kilometres

    Huangmaozhou Wind north-northeast force 4

    Macau Wind north-northeast force 4
      Visibility 12 Kilometres

    Xisha Wind northeast force 3
      Visibility 18 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 09:30 HKT 31/DEC/2017
    (Next update at 17:30 HKT 31/DEC/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:  030/10, OCNL 15 AT FIRST
       OFFSHORE:  010/15 OCNL 20-25 AT FIRST
                  BECMG 090/10-15                      17-21
   B.   2000 FT:  040/10-15, OCNL 20 AT FIRST          12
   C.   5000 FT:  020/10                               10
   D.  10000 FT:  300/15                               5
   E.  18000 FT:  270/30                               MS6
   F.  24000 FT:  270/45                               MS16
   G.  30000 FT:  270/55                               MS31
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 8000 FT
   K. VISIBILITY    : 9 KM.
   L. 0 DEG. C LEVEL: 15000 FT      10 DEG. C LEVEL(S) : 5000 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND NEAR HILLS AT FIRST
   N. SEA STATE     : 2.0-3.0 M     SEA TEMPERATURE    : 19 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE EAST TO 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 20:11 HKT on 01 Dec 17

    VHHK SIGMET 4 VALID 010820/011220 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1642 E11400 - N1736 E11312 - N1812 E11512 - N1642 E11400 TOP FL450 MOV W 05KT NC= VHHK SIGMET 5 VALID 011220/011620 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1806 E11506 - N1642 E11400 - N1712 E11330 - N1818 E11448 - N1806 E11506 TOP FL420 MOV W 05KT WKN=

    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 31/Dec/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     22.6 C
Minimum Air Temperature                     17.6 C
Grass Minimum Temperature                   14.8 C
Relative Humidity                        59 - 83 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2572.1 mm
Against an average of                     2396.8 mm

Other Stations                Min                  Max
King's Park                  16.6 C               23.9 C
Wong Chuk Hang               17.8 C               24.2 C
Ta Kwu Ling                  14.0 C               25.1 C
Lau Fau Shan                 15.0 C               24.8 C
Tai Po                       16.1 C               23.1 C
Sha Tin                      16.6 C               24.4 C
Tuen Mun                     16.3 C               25.0 C
Tseung Kwan O                15.8 C               24.7 C
Sai Kung                     16.8 C               22.5 C
Cheung Chau                  17.2 C               23.5 C
Chek Lap Kok                 17.8 C               23.7 C
Tsing Yi                     17.8 C               24.6 C
Shek Kong                    17.0 C               25.3 C
Tsuen Wan Ho Koon            16.2 C               24.5 C
Tsuen Wan Shing Mun Valley   17.6 C               26.1 C
Hong Kong Park               17.3 C               24.7 C
Shau Kei Wan                 16.5 C               21.8 C
Kowloon City                 16.9 C               25.6 C
Happy Valley                 17.5 C               25.6 C
Wong Tai Sin                 17.5 C               25.2 C
Stanley                      17.1 C               21.9 C
Kwun Tong                    16.9 C               24.9 C
Sham Shui Po                 17.3 C               26.1 C
Kai Tak Runway Park          18.0 C               22.5 C
Yuen Long Park               15.3 C               25.5 C
Tai Mei Tuk               16.5 C               24.9 C

Duration of sunshine (King's Park):              8.7 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 5.
Sea surface temperature (Waglan Island):        17.8 C 

Yesterday's (30 Dec 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 30 Dec
     2003copy right image | Important notices | Privacy policy Last revision date: <31 Dec 2017> 

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