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Bulletin issued at 09:02 HKT 31/Jan/2019

At 9 a.m. at the Hong Kong Observatory the air temperature was 20 degrees Celsius and the relative humidity 83 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.7. The intensity of UV radiation was low.

The air temperatures at other places were:

King's Park 21 degrees;
Wong Chuk Hang 21 degrees;
Ta Kwu Ling 19 degrees;
Lau Fau Shan 19 degrees;
Tai Po 19 degrees;
Sha Tin 20 degrees;
Tuen Mun 20 degrees;
Tseung Kwan O 21 degrees;
Sai Kung 20 degrees;
Cheung Chau 20 degrees;
Chek Lap Kok 21 degrees;
Tsing Yi 20 degrees;
Shek Kong 18 degrees;
Tsuen Wan Ho Koon 19 degrees;
Tsuen Wan Shing Mun Valley 21 degrees;
Hong Kong Park 21 degrees;
Shau Kei Wan 21 degrees;
Kowloon City 23 degrees;
Happy Valley 21 degrees;
Wong Tai Sin 23 degrees;
Stanley 21 degrees;
Kwun Tong 22 degrees;
Sham Shui Po 22 degrees;
Kai Tak Runway Park 22 degrees;
Yuen Long Park 19 degrees;
Tai Mei Tuk 19 degrees.

Between midnight and 9 a.m. the minimum temperature was 18.9 degrees Celsius at the Hong Kong Observatory.


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


Climatological Information for 31 Jan

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Bulletin updated at 08:45 HKT 31/Jan/2019

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

A cold front has formed over central China and is moving southwards gradually. The associated northeast monsoon is expected to reach the south China coast tonight.

Weather forecast for today

Sunny periods. Visibility relatively low. Warm during the day with a maximum temperature of about 24 degrees. Light winds, becoming moderate northeasterlies tonight.

Outlook : Cooler on Friday and Saturday. Becoming humid with fog early next week.


(The above forecast period is valid up to 23:59 HKT today, 31/01/2019; 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/Jan/2019

GALE WARNING AREAS: TAIWAN STRAIT AND BASHI.

GENERAL SITUATION AT 302100 UTC:
THE NORTHEAST MONSOON IS EXPECTED TO AFFECT THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 310100 UTC:

HONG KONG= NE 4-5, 6 LATER. DOWN TO 4000 M IN MIST OR LGT RAIN PATCHES. SEA UP TO 2 M, 3 M LATER. SWELL E TO NE 2 M. TEMP 24-16 C. =
KWANGTUNG= E TO NE 4-5, N 6-7 LATER. DOWN TO 500 M IN FOG OR LGT RAIN PATCHES IN E AT FIRST. SEA UP TO 2 M, 3-4 M LATER. SWELL E TO NE 2 M. =
TAIWAN STRAIT= NE 4-5, N 7-8 LATER. DOWN TO 500 M IN FOG OR LGT RAIN PATCHES AT FIRST. SEA UP TO 2 M, 4-6 M LATER. SWELL NE 2 M. =
BASHI= E TO NE 5-6, 7-8 LATER. RAIN PATCHES. SEA 2-3 M, 4-6 M LATER. SWELL E TO NE 2 M. =
PRATAS= E TO NE 5-6, 7 LATER. RAIN PATCHES. SEA 2-3 M, 4 M LATER. SWELL E TO NE 2 M. =
BALINTANG= E 5-6, 7 LATER. RAIN PATCHES. SEA 2-3 M, 4 M LATER. SWELL E TO NE 2 M. =
SCARBOROUGH= E TO NE 4-5, 6 LATER. FINE. SEA UP TO 2 M, 3 M LATER. SWELL NE 2 M. =
PARACEL= E TO NE 4-5, N 6 LATER. FINE. SEA UP TO 2 M, 3 M LATER. SWELL E TO NE 2 M. =
TONKIN= E TO NE 4-5, N 6 LATER. DOWN TO 500 M IN FOG OR LGT RAIN PATCHES. SEA UP TO 2 M, 3 M LATER. =
DANANG= E TO NE 4-5, N 6 LATER. LGT RAIN PATCHES. SEA UP TO 2 M, 3 M LATER. SWELL E TO 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
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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 31/Jan/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 31 January 2019

    Warnings:
    Strong winds in all areas. Fog in Nan'ao and Shanwei.

    Weather Situation:
    An easterly airstream is affecting the south China coastal waters. The northeast monsoon is expected to reach the region tonight.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Northeast force 4 to 5, becoming force 6 later.
    A few light rain patches, visibility relatively low in some areas at first.
    Moderate seas, becoming rough later.

    Nan'ao and Shanwei:
    East to northeast force 4 to 5, becoming north force 6 to 7 later.
    Fog patches at first.
    Moderate seas, becoming rough later.

    South of Hong Kong and Shangchuan Dao:
    East to northeast force 4 to 5, becoming north force 6 to 7 later.
    Moderate seas, becoming rough later.

    Outlook for the next 48 hours
    Easterly winds of force 5 to 6, up to force 8 at first.

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

    Waglan Island Wind north force 2
      Visibility 12 Kilometres

    Shantou Wind east-northeast force 1
      Visibility 6 Kilometres

    Huangmaozhou Wind north force 3

    Macau Wind north force 2
      Visibility 10 Kilometres

    Xisha Wind calm
      Visibility 23 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 31/JAN/2019
    (Next update at 12:30 HKT 31/JAN/2019)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A COLD FRONT HAS FORMED OVER CENTRAL CHINA AND
     IS MOVING SOUTHWARDS GRADUALLY.  THE ASSOCIATED
     NORTHEAST MONSOON IS EXPECTED TO REACH THE SOUTH
     CHINA COAST TONIGHT.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  VRB/5 BEC 030/10
       OFFSHORE:  030/10-15                            20-24
   B.   2000 FT:  340/10 BEC 030/15-20                 18
   C.   5000 FT:  030/10                               11
   D.  10000 FT:  260/20                               9
   E.  18000 FT:  260/35                               MS4
   F.  24000 FT:  250/50                               MS16
   G.  30000 FT:  250/55                               MS29
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      SUNNY PERIODS.  LOCALIZED HAZE/MIST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT  SCT 8000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 4000 M IN HAZE/MIST.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 5600, 8800, 10400 FT
   M. TURBULENCE    : MOD NEAR HILLS LATER.
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 19 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTHEASTERLY WINDS.  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.

    There is no Significant Weather Information (SIGMET)

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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/Jan/2019 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     21.6 C
Minimum Air Temperature                     17.2 C
Grass Minimum Temperature                   14.1 C
Relative Humidity                        64 - 85 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January             4.7 mm
Against an average of                       24.4 mm

Other Stations                Min                  Max
King's Park                  16.1 C               22.2 C
Wong Chuk Hang               16.3 C               23.0 C
Ta Kwu Ling                  11.5 C               24.9 C
Lau Fau Shan                 13.8 C               23.1 C
Tai Po                       14.2 C               22.0 C
Sha Tin                      15.3 C               22.7 C
Tuen Mun                     14.5 C               23.5 C
Tseung Kwan O                15.1 C               22.0 C
Sai Kung                     15.3 C               21.0 C
Cheung Chau                  15.5 C               23.2 C
Chek Lap Kok                 17.0 C               23.7 C
Tsing Yi                     15.3 C               23.2 C
Shek Kong                    12.3 C               23.3 C
Tsuen Wan Ho Koon            14.0 C               23.2 C
Tsuen Wan Shing Mun Valley   14.1 C               24.5 C
Hong Kong Park               16.0 C               22.1 C
Shau Kei Wan                 16.4 C               20.8 C
Kowloon City                 15.9 C               23.7 C
Wong Tai Sin                 16.7 C               23.2 C
Stanley                      16.5 C               21.5 C
Kwun Tong                    16.3 C               22.9 C
Sham Shui Po                 16.1 C               24.4 C
Kai Tak Runway Park          16.8 C               21.1 C
Yuen Long Park               12.5 C               24.6 C
Tai Mei Tuk               15.6 C               25.2 C

Duration of sunshine (King's Park):              6.7 H
The mean UV index recorded at King's Park yesterday was 3,
the UV intensity was Moderate.
The maximum UV index for yesterday was 6.
 

Yesterday's (30 Jan 2019) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 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                           0.09
Tap Mun                             0.09
Kat O                               0.11
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 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 30 Jan
     2003copy right image | Important notices | Privacy policy Last revision date: <31 Jan 2019> 

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