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Bulletin issued at 09:02 HKT 10/Jan/2018

At 9 a.m. at the Hong Kong Observatory the air temperature was 11 degrees Celsius and the relative humidity 46 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.4. The intensity of UV radiation was low.

Please be reminded that:

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 12 degrees;
Wong Chuk Hang 13 degrees;
Ta Kwu Ling 11 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 13 degrees;
Shek Kong 12 degrees;
Tsuen Wan Ho Koon 10 degrees;
Tsuen Wan Shing Mun Valley 12 degrees;
Hong Kong Park 12 degrees;
Shau Kei Wan 12 degrees;
Kowloon City 11 degrees;
Happy Valley 13 degrees;
Wong Tai Sin 12 degrees;
Stanley 12 degrees;
Kwun Tong 12 degrees;
Sham Shui Po 12 degrees;
Kai Tak Runway Park 13 degrees;
Yuen Long Park 11 degrees;
Tai Mei Tuk 12 degrees.

Between midnight and 9 a.m. the minimum temperature was 10.5 degrees Celsius at the Hong Kong Observatory.


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


Climatological Information for 10 Jan

Regional Weather in Hong Kong

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Bulletin updated at 08:45 HKT 10/Jan/2018

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

An intense winter monsoon continues to affect southern China. Locally, it was still cold this morning. The relative humidity over the territory generally fell to 50 per cent or below.

Weather forecast for today

Cold and dry with sunny periods. The maximum temperature will be about 15 degrees. Moderate north to northeasterly winds, fresh at times.

Outlook : Still cold in the morning in the next couple of days. Mainly fine and dry during the day.


(The above forecast period is valid up to 23:59 HKT today, 10/01/2018; 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 10/Jan/2018

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

GENERAL SITUATION AT 092100 UTC:
AN INTENSE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 100100 UTC:

HONG KONG= N TO NE 5-6. FINE. SEA 2-3 M. SWELL NE UP TO 2 M. TEMP 15-10 C. =
KWANGTUNG= N TO NE 6-7. CLD. SEA 3-4 M. SWELL NE 2 M. =
TAIWAN STRAIT= N TO NE 6-7, OCNL 8. FINE. SEA UP TO 6 M. SWELL NE 2-3 M. =
BASHI= N TO NE 6-7, OCNL 8. RAIN PATCHES. SEA UP TO 6 M. SWELL NE 2-3 M. =
PRATAS= N TO NE 6-7, OCNL 8. RAIN PATCHES. SEA UP TO 6 M. SWELL NE 2-3 M. =
BALINTANG= N TO NE 6-7, OCNL 8. RAIN PATCHES. SEA UP TO 6 M. SWELL NE 2-3 M. =
SCARBOROUGH= N TO NE 6-7, OCNL 8. RAIN PATCHES. SEA UP TO 6 M. SWELL NE 2-3 M. =
PARACEL= N TO NE 6-7. RAIN PATCHES. SEA 3-4 M. SWELL NE 2 M. =
TONKIN= N TO NE 6-7. CLD. 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.


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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 09:30 HKT 10/Jan/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 10 January 2018

    Warnings:
    Strong winds in all areas.

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

    Area forecasts for the next 24 hours

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

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    North to northeast force 6 to 7.
    Rough seas.

    Outlook for the next 48 hours
    Northeasterly winds of force 6 to 7, becoming easterly winds up to force 8 later.

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

    Waglan Island Wind north force 5
      Visibility 48 Kilometres

    Shantou Wind north force 1
      Visibility 30 Kilometres

    Dongsha Wind northeast force 5
      Visibility 10 Kilometres

    Huangmaozhou Wind north-northeast force 4

    Macau Wind north force 5
      Visibility 20 Kilometres

    Xisha Wind northeast force 3
      Visibility 20 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 09:00 HKT 10/JAN/2018
    (Next update at 17:30 HKT 10/JAN/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB ON HIGH GROUND.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN INTENSE NORTHEAST MONSOON CONTINUES TO AFFECT
     SOUTHERN CHINA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  020/10-15
       OFFSHORE:  020/15-20                            11-15
   B.   2000 FT:  040/20-25                            9
   C.   5000 FT:  030/15                               8
   D.  10000 FT:  270/35                               2
   E.  18000 FT:  270/65                               MS6
   F.  24000 FT:  280/80                               MS13
   G.  30000 FT:  280/80                               MS30
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      4500 - 5000 FT.
   I. WEATHER       : 
      SUNNY PERIODS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT  SCT 8000 FT.
   K. VISIBILITY    : 10 KM.
   L. 0 DEG. C LEVEL: 12000 FT      10 DEG. C LEVEL(S) : 1000 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 17 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTH TO NORTHEASTERLY 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=

    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 15:30 HKT 04/Jan/2018


    Tropical Cyclone Warning

    At 040600 UTC, Tropical Depression Bolaven (1801) has weakened into an area of low pressure.

    No further warnings on this area of low pressure will be issued by the Hong Kong Observatory unless regeneration takes place.



    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 10/Jan/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     10.7 C
Minimum Air Temperature                      7.9 C
Grass Minimum Temperature                    9.3 C
Relative Humidity                        59 - 97 Percent
Rainfall                                     9.9 mm 
Total rainfall since 1st January            41.8 mm
Against an average of                        6.7 mm

Other Stations                Min                  Max
King's Park                   7.0 C               10.6 C
Wong Chuk Hang                8.3 C               11.2 C
Ta Kwu Ling                   5.5 C               10.2 C
Lau Fau Shan                  6.2 C               10.0 C
Tai Po                        6.5 C               9.8 C
Sha Tin                       6.8 C               11.0 C
Tuen Mun                      6.7 C               10.5 C
Tseung Kwan O                 7.2 C               9.9 C
Sai Kung                      6.7 C               10.9 C
Cheung Chau                   6.7 C               9.5 C
Chek Lap Kok                  7.4 C               11.5 C
Tsing Yi                      6.9 C               10.6 C
Shek Kong                     6.2 C               10.2 C
Tsuen Wan Ho Koon             5.3 C               9.3 C
Tsuen Wan Shing Mun Valley    7.2 C               10.6 C
Hong Kong Park                7.7 C               11.1 C
Shau Kei Wan                  7.3 C               10.9 C
Kowloon City                  6.6 C               10.3 C
Happy Valley                  8.2 C               11.7 C
Wong Tai Sin                  6.8 C               10.7 C
Stanley                       8.4 C               11.4 C
Kwun Tong                     7.4 C               10.2 C
Sham Shui Po                  7.6 C               11.1 C
Kai Tak Runway Park           8.2 C               11.8 C
Yuen Long Park                6.0 C               10.2 C
Tai Mei Tuk                6.4 C               10.4 C

Duration of sunshine (King's Park):              0.0 H
The mean UV index recorded at King's Park yesterday was 0.6,
the UV intensity was Low.
The maximum UV index for yesterday was 2.
Sea surface temperature (Waglan Island):        17.2 C 

Yesterday's (09 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                          0.10
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 09 Jan
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