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Bulletin issued at 15:31 HKT 03/Jan/2018

At 3 p.m. at the Hong Kong Observatory the air temperature was 21 degrees Celsius and the relative humidity 69 per cent.
During the past hour the mean UV Index recorded at King's Park was 3. The intensity of UV radiation was moderate.

The air temperatures at other places were:

King's Park 22 degrees;
Wong Chuk Hang 21 degrees;
Ta Kwu Ling 24 degrees;
Lau Fau Shan 26 degrees;
Tai Po 22 degrees;
Sha Tin 23 degrees;
Tuen Mun 24 degrees;
Tseung Kwan O 21 degrees;
Sai Kung 21 degrees;
Cheung Chau 21 degrees;
Chek Lap Kok 25 degrees;
Tsing Yi 24 degrees;
Shek Kong 24 degrees;
Tsuen Wan Ho Koon 23 degrees;
Tsuen Wan Shing Mun Valley 23 degrees;
Hong Kong Park 22 degrees;
Shau Kei Wan 19 degrees;
Kowloon City 23 degrees;
Happy Valley 22 degrees;
Wong Tai Sin 22 degrees;
Stanley 20 degrees;
Kwun Tong 20 degrees;
Sham Shui Po 24 degrees;
Kai Tak Runway Park 21 degrees;
Yuen Long Park 25 degrees;
Tai Mei Tuk 22 degrees.

Here is the information on Tropical Storm Bolaven at 3 p.m.:
Location: 11.0 degrees north, 114.3 degrees east.


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


Climatological Information for 3 Jan

Regional Weather in Hong Kong

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Bulletin updated at 15:30 HKT 03/Jan/2018

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

An easterly airstream is affecting the coast of Guangdong.

Tropical Depression Bolaven has intensified into a tropical storm. At 3 p.m., Bolaven was centred about 70 kilometres north of Nansha Dao. It is forecast to move west at about 25 kilometres per hour towards the vicinity of the southern part of Vietnam.

Weather forecast for this afternoon and tonight

Mainly fine. Becoming cloudy tonight. Moderate to fresh easterly winds.

Outlook : Becoming cloudy with rain in the next couple of days. The weather will become cold early next week.


(The above forecast period is valid up to 23:59 HKT today, 03/01/2018; 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 03/Jan/2018

GALE WARNING AREAS: BASHI, PRATAS AND BALINTANG.

GENERAL SITUATION AT 022100 UTC:
AN EASTERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 030100 UTC:

HONG KONG= E 4-5, OCNL 6. FINE. RAIN PATCHES LATER. SEA UP TO 3 M. SWELL E UP TO 2 M. TEMP 22-17 C. =
KWANGTUNG= E TO NE 6-7. RAIN PATCHES. SEA 3-4 M. SWELL E TO NE 2-3 M. =
TAIWAN STRAIT= NE 5-6, OCNL 7. FINE. SEA UP TO 4 M. SWELL NE 2 M. =
BASHI= E 7-8. RAIN PATCHES. SEA 4-6 M. SWELL E TO NE 3-4 M. =
PRATAS= E 6-7, OCNL 8. RAIN PATCHES. SEA UP TO 6 M. SWELL E TO NE 2-3 M. =
BALINTANG= E 7-8. RAIN PATCHES. SEA 4-6 M. SWELL E TO NE 3-4 M. =
SCARBOROUGH= E TO NE 5-6, OCNL 7. ISOL SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 2-3 M. =
PARACEL= E TO NE 6-7. ISOL SHOWERS AND TS IN S. SEA 3-4 M. SWELL E TO NE 2-3 M. =
TONKIN= E TO NE 5-6. RAIN PATCHES. SEA 2-3 M. SWELL E TO NE 2 M. =
DANANG= E TO NE 5-6. ISOL SHOWERS AND TS IN S. SEA 2-3 M. SWELL E TO 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.


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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 12:30 HKT 03/Jan/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 p.m. on 03 January 2018

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    An easterly airstream is affecting the south China coastal waters.

    At noon, Tropical Depression Bolaven with maximum sustained winds of about 55 kilometres per hour near its centre was located at 10.6 degrees north, 115.1 degrees east, it is forecast to move west at about 25 kilometres per hour towards the vicinity of the southern part of Vietnam..

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 4 to 5, occasionally force 6.
    A few rain patches later.
    Moderate to rough seas.

    Nan'ao and Shanwei:
    East to northeast force 6 to 7.
    Rough seas.

    South of Hong Kong and Shangchuan Dao:
    East force 6 to 7.
    Rough seas.

    Outlook for the next 48 hours
    East to northeasterly winds of force 5 to 6, up to force 7 in east later. Isolated showers and thunderstorms.

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

    Waglan Island Wind east-northeast force 5
      Visibility 14 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 17 Kilometres

    Dongsha Wind east-northeast force 5
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 6

    Macau Wind north-northeast force 2
      Visibility 9 Kilometres

    Xisha Wind east-northeast force 3
      Visibility 14 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 03/JAN/2018
    (Next update at 17:30 HKT 03/JAN/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN EASTERLY AIRSTREAM IS AFFECTING THE COAST OF
     GUANGDONG.
     THE TROPICAL DEPRESSION OVER THE SOUTHERN PART
     OF THE SOUTH CHINA SEA WAS NAMED BOLAVEN.  AT 9
     A.M., TROPICAL DEPRESSION BOLAVEN WAS CENTRED
     NEAR 10.4 DEGREES NORTH, 115.8 DEGREES EAST.  IT
     IS FORECAST TO MOVE WEST AT ABOUT 16 KNOTS IN
     THE GENERAL DIRECTION OF THE SOUTHERN PART OF
     VIETNAM.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  080/10, OCNL 15
       OFFSHORE:  080/15-20, OCNL 25                   19-24
   B.   2000 FT:  100/20-25, OCNL 30                   16
   C.   5000 FT:  080/15                               12
   D.  10000 FT:  140/10                               8
   E.  18000 FT:  220/25                               MS4
   F.  24000 FT:  220/35                               MS15
   G.  30000 FT:  240/40                               MS29
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      2000-2600, 4300-4700 FT.
   I. WEATHER       : 
      MAINLY FINE.  LOCALIZED MIST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3500 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 4000 M IN MIST.
   L. 0 DEG. C LEVEL: 16000 FT
      10 DEG. C LEVEL(S) : 6200, 9400 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 2.0-3.0 M     SEA TEMPERATURE    : 18 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE EASTERLY WINDS, FRESH AT TIMES.  MAINLY
     CLOUDY.=

    ===================================================================
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.

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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=

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    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 15:30 HKT 03/Jan/2018


    Tropical Cyclone Warning

    Tropical Depression Bolaven (1801) has intensified into a Tropical Storm with central pressure 998 hectopascals. At 030600 UTC, it was centred within 90 nautical miles of one zero point nine degrees north (10.9 N) one one four point eight degrees east (114.8 E) and is forecast to move west at about 14 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 60 nautical miles.

    Forecast position and intensity at 040600 UTC
    One zero point three degrees north (10.3 N)
    One zero nine point seven degrees east (109.7 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 050600 UTC
    Dissipated over sea.



    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 03/Jan/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     19.2 C
Minimum Air Temperature                     16.0 C
Grass Minimum Temperature                   14.2 C
Relative Humidity                        68 - 84 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January               0 mm
Against an average of                        0.3 mm

Other Stations                Min                  Max
King's Park                  15.0 C               20.0 C
Wong Chuk Hang               15.4 C               20.0 C
Ta Kwu Ling                  12.0 C               21.8 C
Lau Fau Shan                 15.2 C               23.8 C
Tai Po                       14.5 C               19.9 C
Sha Tin                      14.3 C               21.0 C
Tuen Mun                     15.8 C               20.6 C
Tseung Kwan O                14.6 C               19.1 C
Sai Kung                     15.4 C               19.4 C
Cheung Chau                  15.7 C               20.4 C
Chek Lap Kok                 16.7 C               22.4 C
Tsing Yi                     15.2 C               21.1 C
Shek Kong                    14.1 C               22.1 C
Tsuen Wan Ho Koon            13.1 C               21.5 C
Tsuen Wan Shing Mun Valley   13.5 C               20.8 C
Hong Kong Park               15.3 C               20.8 C
Shau Kei Wan                 15.1 C               18.6 C
Kowloon City                 15.1 C               22.5 C
Happy Valley                 15.6 C               20.2 C
Wong Tai Sin                 14.9 C               21.4 C
Stanley                      15.9 C               18.7 C
Kwun Tong                    15.4 C               19.3 C
Sham Shui Po                 15.6 C               22.1 C
Kai Tak Runway Park          16.4 C               19.3 C
Yuen Long Park               14.9 C               22.9 C
Tai Mei Tuk               15.0 C               22.0 C

Duration of sunshine (King's Park):              3.6 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):        17.7 C 

Yesterday's (02 Jan 2018) 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 02 Jan
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