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Bulletin issued at 09:02 HKT 01/Feb/2018

At 9 a.m. at the Hong Kong Observatory the air temperature was 9 degrees Celsius and the relative humidity 60 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.5. The intensity of UV radiation was low.

Please be reminded that:

The Fire Danger Warning is Yellow and the fire risk is high.
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 8 degrees;
Wong Chuk Hang 10 degrees;
Ta Kwu Ling 6 degrees;
Lau Fau Shan 6 degrees;
Tai Po 7 degrees;
Sha Tin 8 degrees;
Tuen Mun 7 degrees;
Sai Kung 8 degrees;
Cheung Chau 8 degrees;
Chek Lap Kok 7 degrees;
Tsing Yi 8 degrees;
Shek Kong 7 degrees;
Tsuen Wan Ho Koon 6 degrees;
Tsuen Wan Shing Mun Valley 8 degrees;
Hong Kong Park 8 degrees;
Shau Kei Wan 9 degrees;
Kowloon City 9 degrees;
Happy Valley 9 degrees;
Wong Tai Sin 8 degrees;
Stanley 10 degrees;
Kwun Tong 9 degrees;
Sham Shui Po 8 degrees;
Kai Tak Runway Park 9 degrees;
Yuen Long Park 7 degrees;
Tai Mei Tuk 8 degrees.

Between midnight and 9 a.m. the minimum temperature was 6.8 degrees Celsius at the Hong Kong Observatory.


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


Climatological Information for 1 Feb

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 08:45 HKT 01/Feb/2018

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

An intense winter monsoon is bringing very cold weather to southern China. Locally, the minimum temperature recorded at the Observatory was 6.8 degrees, the lowest so far this winter.

Weather forecast for today

Mainly fine and dry. Very cold in the morning. The maximum temperature will be about 13 degrees during the day. Moderate to fresh north to northeasterly winds.

Outlook : Mainly fine and dry with relatively large temperature difference between day and night in the next few days. The cold spell will persist into the latter part of next week.


(The above forecast period is valid up to 23:59 HKT today, 01/02/2018; 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 01/Feb/2018

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

GENERAL SITUATION AT 312100 UTC:
AN INTENSE NORTHEAST MONSOON PERSISTS OVER THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 010100 UTC:

HONG KONG= N TO NE 6-7, OCNL 8. FINE. SEA UP TO 6 M. SWELL NE 2 M. TEMP 13-10 C. =
KWANGTUNG= N TO NE 7-8. FINE. SEA 4-6 M. SWELL N TO NE 2-3 M. =
TAIWAN STRAIT= N TO NE 8, OCNL 9. LGT RAIN PATCHES. SEA UP TO 8 M. SWELL N TO NE 3-4 M. =
BASHI= N TO NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL N TO NE 3-4 M. =
PRATAS= N TO NE 7-8. LGT RAIN PATCHES. SEA 4-6 M. SWELL N TO NE 2-3 M. =
BALINTANG= N TO NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL N TO NE 3 M. =
SCARBOROUGH= N TO NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL NE 2-3 M. =
PARACEL= N TO NE 7-8. LGT RAIN PATCHES. SEA 4-6 M. SWELL NE 2-3 M. =
TONKIN= N TO NE 6-7, OCNL 8. LGT RAIN PATCHES. SEA UP TO 6 M. SWELL N TO NE 2-3 M. =
DANANG= N TO NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL N 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.


  • Map showing the 10 forecast areas
  • Tidal Information

    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 09:30 HKT 01/Feb/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 01 February 2018

    Warnings:
    Gale force winds in all areas.

    Weather Situation:
    An intense northeast monsoon persists over the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North to northeast force 6 to 7, occasionally force 8.
    Rough to very rough seas.

    Nan'ao and Shanwei:
    North to northeast force 7 to 8.
    Rough to very rough seas.

    South of Hong Kong and Shangchuan Dao:
    North to northeast force 6 to 7, occasionally force 8.
    Rough to very rough seas.

    Outlook for the next 48 hours
    North to northeasterly winds of force 6 to 7, occasionally force 8.

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

    Waglan Island Wind north force 3
      Visibility 20 Kilometres

    Shantou Wind north-northeast force 2
      Visibility 19 Kilometres

    Dongsha Wind northeast force 5
      Visibility 10 Kilometres

    Huangmaozhou Wind north force 3

    Macau Wind north force 3
      Visibility 8 Kilometres

    Xisha Wind north-northeast force 4
      Visibility 24 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 01/FEB/2018
    (Next update at 17:30 HKT 01/FEB/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN INTENSE NORTHEAST MONSOON PERSISTS OVER THE
     SOUTH CHINA COASTAL AREAS.
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, OCNL 25                   7-13
   B.   2000 FT:  060/15-20, OCNL 25                   6
   C.   5000 FT:  260/10                               8
   D.  10000 FT:  270/35                               3
   E.  18000 FT:  300/55                               MS7
   F.  24000 FT:  270/75                               MS17
   G.  30000 FT:  270/90                               MS30
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      1300 - 2100, 2700 - 3400, 4000 - 5000 FT.
   I. WEATHER       : 
      MAINLY FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT.
   K. VISIBILITY    : 9 KM.
   L. 0 DEG. C LEVEL: 11000 FT
      10 DEG. C LEVEL(S) : NEAR SURFACE
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 2.5-3.5 M     SEA TEMPERATURE    : 15 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTH TO NORTHEASTERLY WINDS.
     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

    Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
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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 01/Feb/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     10.6 C
Minimum Air Temperature                      7.8 C
Grass Minimum Temperature                    8.2 C
Relative Humidity                        70 - 96 Percent
Rainfall                                    19.3 mm 
Total rainfall since 1st January            62.2 mm
Against an average of                       24.7 mm

Other Stations                Min                  Max
King's Park                   7.2 C               10.0 C
Wong Chuk Hang                7.9 C               11.5 C
Ta Kwu Ling                   5.7 C               8.2 C
Lau Fau Shan                  6.6 C               8.3 C
Tai Po                        6.1 C               7.8 C
Sha Tin                       6.7 C               9.0 C
Tuen Mun                      6.7 C               8.5 C
Tseung Kwan O                 6.6 C               10.3 C
Sai Kung                      7.4 C               10.2 C
Cheung Chau                   6.7 C               9.2 C
Chek Lap Kok                  7.2 C               9.8 C
Tsing Yi                      7.1 C               10.6 C
Shek Kong                     6.2 C               8.6 C
Tsuen Wan Ho Koon             5.5 C               8.5 C
Tsuen Wan Shing Mun Valley    6.4 C               10.6 C
Hong Kong Park                7.8 C               10.5 C
Shau Kei Wan                  7.3 C               10.5 C
Kowloon City                  6.6 C               9.8 C
Happy Valley                  8.1 C               11.1 C
Wong Tai Sin                  6.8 C               9.2 C
Stanley                       7.7 C               10.9 C
Kwun Tong                     6.7 C               10.1 C
Sham Shui Po                  7.5 C               10.7 C
Kai Tak Runway Park           7.7 C               10.9 C
Yuen Long Park                6.3 C               8.4 C
Tai Mei Tuk                6.5 C               9.0 C

Duration of sunshine (King's Park):              0.2 H
The mean UV index recorded at King's Park yesterday was 0.8,
the UV intensity was Low.
The maximum UV index for yesterday was 3.
Sea surface temperature (Waglan Island):        16.3 C 

Yesterday's (31 Jan 2018) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 to
0.16 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                           0.09
Tap Mun                             0.09
Kat O                               0.11
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.13
Sha Tau Kok                         0.11
Kwun Tong                           0.13
Sai Wan Ho                          0.10
King's Park                         0.15
Tsim Bei Tsui                       0.14
Cape D'Aguilar                      0.14
Chek Lap Kok                        0.16

Note

      

    1. From readings taken at various locations in Hong Kong in the
past, the hourly mean ambient gamma radiation dose rate may
vary between 0.06 and 0.3 microsievert per hour. (1
microsievert = 0.000001 sievert = 0.001 millisievert)

    2. Temporal variations are generally caused by changes in
meteorological conditions such as rainfall, wind and
barometric pressure.

    3. Spatial variations are generally caused by differences in
the radioactive content of local rock and soil.

    4. The data displayed is provisional. Only limited data
validation has been carried out.
    Climatological Information for 31 Jan
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