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Bulletin issued at 07:02 HKT 17/Dec/2017

At 7 a.m. at the Hong Kong Observatory the air temperature was 12 degrees Celsius and the relative humidity 67 per cent.

Please be reminded that:

The Strong Monsoon Signal has been issued.
The Fire Danger Warning is Red and the fire risk is extreme.
The Cold Weather Warning is now in force. Cold weather might cause adverse health effects. Members of the public should take care to keep warm.

The air temperatures at other places were:

King's Park 11 degrees;
Wong Chuk Hang 12 degrees;
Ta Kwu Ling 10 degrees;
Lau Fau Shan 11 degrees;
Tai Po 11 degrees;
Sha Tin 12 degrees;
Tuen Mun 11 degrees;
Tseung Kwan O 11 degrees;
Sai Kung 11 degrees;
Cheung Chau 11 degrees;
Chek Lap Kok 12 degrees;
Tsing Yi 12 degrees;
Shek Kong 11 degrees;
Tsuen Wan Ho Koon 10 degrees;
Tsuen Wan Shing Mun Valley 11 degrees;
Hong Kong Park 12 degrees;
Shau Kei Wan 11 degrees;
Kowloon City 11 degrees;
Happy Valley 12 degrees;
Wong Tai Sin 11 degrees;
Stanley 12 degrees;
Kwun Tong 11 degrees;
Sham Shui Po 12 degrees;
Kai Tak Runway Park 13 degrees;
Yuen Long Park 11 degrees;
Tai Mei Tuk 11 degrees.

Here is the information on Tropical Storm Kai-tak at 5 a.m.:
Location: 12.0 degrees north, 124.5 degrees east.


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


Climatological Information for 17 Dec

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 06:45 HKT 17/Dec/2017

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

An intense winter monsoon is affecting the coastal areas of Guangdong.

At 5 a.m., Tropical Storm Kai-tak was centred about 470 kilometres southeast of Manila. It is forecast to move west-southwest at about 14 kilometres per hour across the Philippines.

Weather forecast for today

Cold and dry. Mainly cloudy in the morning. Sunny periods during the day with a maximum temperature of around 16 degrees. Fresh northerly winds, strong offshore and on high ground at first.

Outlook : Cold in the morning in the next couple of days with minimum temperatures remaining at 12 degrees or below.


(The above forecast period is valid up to 23:59 HKT today, 17/12/2017; 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 21:00 HKT 16/Dec/2017

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

GENERAL SITUATION AT 160900 UTC:
COLD FRONT 18N 112E 22N 121E 22N 123E 23N 115E S 15KT. TROPICAL STORM KAI-TAK (1726) 988 HPA 12N 125E WSW 8 KT INTST NC.

MARINE FORECAST FOR 24 HOURS FROM 161300 UTC:

HONG KONG= N 7-8. FINE. SEA 4-6 M. SWELL NE 2-3 M. TEMP 12-16 C. =
KWANGTUNG= N 7-8, OCNL 9 IN E. FINE. SEA 4-6 M, UP TO 8 M IN E. SWELL NE 3-5 M. =
TAIWAN STRAIT= N 8-9. RAIN PATCHES. SEA 6-8 M. SWELL NE 3-5 M. =
BASHI= N 8-9. RAIN PATCHES. SEA 6-8 M. SWELL NE 3-5 M. =
PRATAS= N 8, OCNL 9. RAIN PATCHES. SEA UP TO 6 M. SWELL NE 3-5 M. =
BALINTANG= N 8-9. RAIN PATCHES. SEA 6-8 M. SWELL NE 3-5 M. =
SCARBOROUGH= N 8-9. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 6-8 M. SWELL NE 3-5 M. =
PARACEL= N 8. RAIN PATCHES. SEA 6 M. SWELL NE 3-5 M. =
TONKIN= N 7-8. RAIN PATCHES. SEA 4-6 M. SWELL NE 2-3 M. =
DANANG= N 7-8. RAIN PATCHES. SEA 4-6 M. SWELL NE 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.


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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 05:30 HKT 17/Dec/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 17 December 2017

    Warnings:
    Gale force winds in all areas.

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

    At 5 a.m., Tropical Storm Kai-tak with maximum sustained winds of about 75 kilometres per hour near its centre was located at 12.0 degrees north, 124.5 degrees east, it is forecast to move west-southwest at about 14 kilometres per hour across the Philippines.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North force 7 to 8.
    Rough to very rough seas.

    Nan'ao:
    North force 8, occasionally force 9.
    Very rough to high seas.

    Shanwei, South of Hong Kong and Shangchuan Dao:
    North force 7 to 8.
    Rough to very rough seas.

    Outlook for the next 48 hours
    Northerly winds of force 7 to 8.

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

    Waglan Island Wind north force 6
      Visibility 32 Kilometres

    Shantou Wind northeast force 2
      Visibility 30 Kilometres

    Huangmaozhou Wind north force 5

    Macau Wind north force 4
      Visibility 7 Kilometres

    Xisha Wind north-northeast force 5
      Visibility 19 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 01:30 HKT 17/DEC/2017
    (Next update at 9:00-9:30 HKT 17/DEC/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN INTENSE WINTER MONSOON IS AFFECTING THE
     COASTAL AREAS OF GUANGDONG.
     AT 11 P.M. LAST NIGHT, TROPICAL STORM KAI-TAK
     WAS CENTERED NEAR 12.0 DEGREES NORTH, 124.9
     DEGREES EAST AND IS FORECAST TO MOVE
     WEST-SOUTHWEST AT ABOUT 8 KNOTS ACROSS THE
     PHILIPPINES.  
     
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  360/15
       OFFSHORE:  010/20-25, OCNL 30                   10-16
   B.   2000 FT:  030/25-30, OCNL 35                   7
   C.   5000 FT:  080/15                               8
   D.  10000 FT:  280/15                               1
   E.  18000 FT:  290/30                               1
   F.  24000 FT:  280/25                               MS13
   G.  30000 FT:  260/20                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      2500-3300 FT.
   I. WEATHER       : 
      MAINLY CLOUDY.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT SCT 4000 FT
   K. VISIBILITY    : 10 KM.
   L. 0 DEG. C LEVEL: 19500 FT      10 DEG. C LEVEL(S) : 1000 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 2.0-4.5 M     SEA TEMPERATURE    : 21 DEG
IV.  FURTHER OUTLOOK: 
     FRESH NORTHERLY WINDS, STRONG OFFSHORE. MAINLY
     CLOUDY AT FIRST, SUNNY PERIODS DURING THE DAY.=

    ===================================================================
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

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    Bulletin issued at 06:30 HKT 17/Dec/2017


    Tropical Cyclone Warning

    At 162100 UTC, Tropical Storm Kai-tak (1726) with central pressure 995 hectopascals was centred within 90 nautical miles of one two point zero degrees north (12.0 N) one two four point five degrees east (124.5 E) and is forecast to move west-southwest at about 8 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 35 knots.

    Radius of over 33 knot winds 30 nautical miles.
    Radius of over 2 metre waves 90 nautical miles.

    Forecast position and intensity at 172100 UTC
    One zero point seven degrees north (10.7 N)
    One two one point five degrees east (121.5 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 182100 UTC
    One zero point two degrees north (10.2 N)
    One one eight point zero degrees east (118.0 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 192100 UTC
    Nine point four degrees north (9.4 N)
    One one five point zero degrees east (115.0 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 202100 UTC
    Eight point four degrees north (8.4 N)
    One one one point two degrees east (111.2 E)
    Maximum winds 55 knots.

    Forecast position and intensity at 212100 UTC
    Seven point eight degrees north (7.8 N)
    One zero seven point two degrees east (107.2 E)
    Maximum winds 50 knots.



    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 17/Dec/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     19.5 C
Minimum Air Temperature                     12.2 C
Grass Minimum Temperature                   12.3 C
Relative Humidity                        59 - 78 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2572.1 mm
Against an average of                     2383.7 mm

Other Stations                Min                  Max
King's Park                  11.5 C               19.2 C
Wong Chuk Hang               12.4 C               19.1 C
Ta Kwu Ling                  10.8 C               18.4 C
Lau Fau Shan                 11.0 C               17.9 C
Tai Po                       11.6 C               19.0 C
Sha Tin                      11.9 C               19.4 C
Tuen Mun                     11.8 C               18.2 C
Tseung Kwan O                11.5 C               18.8 C
Sai Kung                     11.7 C               18.8 C
Cheung Chau                  11.4 C               18.0 C
Chek Lap Kok                 12.1 C               18.0 C
Tsing Yi                     12.0 C               19.1 C
Shek Kong                    11.4 C               18.6 C
Tsuen Wan Ho Koon             9.9 C               17.4 C
Tsuen Wan Shing Mun Valley   10.5 C               19.0 C
Hong Kong Park               12.7 C               19.8 C
Shau Kei Wan                 11.8 C               18.6 C
Kowloon City                 11.0 C               18.9 C
Happy Valley                 12.5 C               19.6 C
Wong Tai Sin                 11.2 C               18.9 C
Stanley                      12.2 C               18.8 C
Kwun Tong                    11.1 C               18.7 C
Sham Shui Po                 11.7 C               19.7 C
Kai Tak Runway Park          12.3 C               19.7 C
Yuen Long Park               11.1 C               18.5 C
Tai Mei Tuk               10.7 C               18.4 C

Duration of sunshine (King's Park):              6.1 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):        19.2 C 

Yesterday's (16 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                          0.10
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 16 Dec
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