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Bulletin issued at 05:02 HKT 31/Mar/2017

At 5 a.m. at the Hong Kong Observatory the air temperature was 22 degrees Celsius and the relative humidity 96 per cent.

The air temperatures at other places were:

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


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


Climatological Information for 31 Mar

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


Local Weather Forecast
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Automatic Regional Weather Forecast in Hong Kong & Pearl River Delta Region

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UV Index Forecast |  Weather Information for South China Coastal Waters

Bulletin updated at 04:45 HKT 31/Mar/2017

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

A humid easterly airstream is affecting the coast of Guangdong. Locally, it was foggy this morning. The visibility in the harbour fell below 1000 metres. Besides, the cold front over the northern part of Guangdong is bringing rain and thunderstorms to the region. The cold front is expected to move across the coastal areas during the day today.

Weather forecast for today

Mainly cloudy with a few rain patches. Foggy at first. Moderate east to southeasterly winds. Winds will freshen from the north during the day and rain will become more frequent with squally thunderstorms. Temperatures will fall significantly from a maximum of around 23 degrees to about 16 degrees tonight.

Outlook : It will be fine and dry in the next couple of days. Cool in the morning.


(The above forecast period is valid up to 23:59 HKT today, 31/03/2017; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

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MARINE FORECAST
Traditional Chinese Simplified Chinese

Marine Forecast

Weather Information for the Marine Community

Bulletin issued at 21:00 HKT 30/Mar/2017

GALE WARNING AREA: TAIWAN STRAIT.

GENERAL SITUATION AT 300900 UTC:
TROUGH 23N 105E 26N 113E 30N 118E S SLOWLY.

MARINE FORECAST FOR 24 HOURS FROM 301300 UTC:

HONG KONG= E TO SE 4-5, N 6 LATER. DOWN TO 500 M IN FOG OR RAIN PATCHES AT FIRST. ISOL SHOWERS AND SQUALLY TS LATER. SEA 2 M, UP TO 3 M LATER. TEMP 24-18 C. =
KWANGTUNG= E TO SE 4-5, N 6 LATER. DOWN TO 500 M IN FOG OR RAIN PATCHES AT FIRST. ISOL SHOWERS AND SQUALLY TS LATER. SEA 2 M, UP TO 3 M LATER. =
TAIWAN STRAIT= S TO SE 4-5, NE 7-8 LATER. DOWN TO 2000 M IN MIST OR RAIN PATCHES AT FIRST. ISOL SHOWERS AND SQUALLY TS LATER. SEA UP TO 2 M, 4-6 M LATER. SWELL NE UP TO 2 M. =
BASHI= E TO SE 5-6. RAIN PATCHES. SEA 2-3 M. SWELL E 2 M. =
PRATAS= E TO SE 4-5. DOWN TO 500 M IN FOG OR RAIN PATCHES IN N. SEA 2 M. SWELL E UP TO 2 M. =
BALINTANG= E TO SE 5-6. RAIN PATCHES. SEA 2-3 M. SWELL E 2 M. =
SCARBOROUGH= E 4-5. FINE. SEA UP TO 2 M. SWELL E UP TO 2 M. =
PARACEL= E TO SE 4-5. DOWN TO 500 M IN FOG OR RAIN PATCHES IN N AT FIRST. ISOL SHOWERS AND SQUALLY TS IN N LATER. SEA UP TO 2 M. =
TONKIN= SE 4-5, N 6-7 LATER. DOWN TO 500 M IN FOG OR RAIN PATCHES AT FIRST. ISOL SHOWERS AND SQUALLY TS LATER. SEA 2 M, 3 M LATER. =
DANANG= SE 4-5. DOWN TO 500 M IN FOG OR RAIN PATCHES. SEA UP TO 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
  • Tidal Information

    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

    Current Weather | Local Weather Forecast | Regional Temperature Forecast in HK
    9-day Weather Forecast | UV Index Forecast | Weather Information for Fishermen

    Bulletin issued at 05:30 HKT 31/Mar/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 31 March 2017

    Warnings:
    Strong winds in all areas. Fog in all areas.

    Weather Situation:
    A humid easterly airstream is affecting the coastal waters of Guangdong. A cold front is expected to move across the south China coastal waters during the day today.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to southeast force 4 to 5, becoming north force 6.
    A few rain patches. Fog patches at first. Isolated showers and squally thunderstorms later.
    Moderate seas, becoming rough.

    Nan'ao, Shanwei and South of Hong Kong:
    East to southeast force 4 to 5, becoming north force 6.
    Fog patches at first. Isolated showers and squally thunderstorms later.
    Moderate seas, becoming rough.

    Shangchuan Dao:
    Southeast force 4 to 5, becoming north force 6.
    Fog patches at first. Isolated showers and squally thunderstorms later.
    Moderate seas, becoming rough.

    Outlook for the next 48 hours
    Northerly winds of force 6 to 7. Isolated showers and squally thunderstorms.

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

    Waglan Island Wind north force 3
      Visibility 60 Metres

    Shantou Wind calm
      Visibility 6 Kilometres in mist

    Dongsha Wind east-northeast force 1
      Visibility 10 Kilometres

    Huangmaozhou Wind southeast force 3

    Macau Wind southeast force 1
      Visibility 200 Metres in fog

    Xisha Wind calm
      Visibility 20 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
  • Descriptive Terms of Wind Speeds
  • Visibility Readings in Hong Kong Waters
  • Map showing forecast areas
  • Tidal Information

    • WEATHER FORECAST FOR LOCAL AVIATION
    Traditional Chinese Simplified Chinese

    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 31/MAR/2017
    (Next update at 9:00-9:30 HKT 31/MAR/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN EASTERLY AIRSTREAM IS AFFECTING THE COASTAL
     WATERS OF GUANGDONG. THE TROUGH OF LOW PRESSURE
     OVER CENTRAL CHINA IS EXPECTED TO DEVELOP INTO A
     COLD FRONT AND WILL MOVE ACROSS THE SOUTH CHINA
     COASTAL WATERS DURING THE DAY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  120/5-10
                  BEC 350/15-20                        23-18
   B.   2000 FT:  150/10-15
                  BEC 340/20                           18
   C.   5000 FT:  220/15                               15
   D.  10000 FT:  250/20                               9
   E.  18000 FT:  260/30                               MS7
   F.  24000 FT:  270/40                               MS18
   G.  30000 FT:  260/70                               MS33
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW RAIN PATCHES.
      LOCALIZED MIST. ISOLATED SHOWERS AND SQUALLY
      THUNDERSTORMS LATER.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1200 FT SCT 2500 FT TEMPO FEW 800FT CB SCT
      2000FT
   K. VISIBILITY    : 7 KM.  TEMPO 2000 M IN MIST/RAIN. TEMPO 1500 M IN SHRA/TS
   L. 0 DEG. C LEVEL: 14500 FT      10 DEG. C LEVEL(S) : 8400, 9300, 10000 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS, OFFSHORE AND  NEAR HILLS
   N. SEA STATE     : 1.0-2.0 M     SEA TEMPERATURE    : 19 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTHERLY WINDS. ISOLATED
     SQUALLY THUNDERSTORMS. LOCALIZED MIST/FOG.=

    ===================================================================
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
    Traditional Chinese Simplified Chinese

    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 17:25 HKT on 25 Mar 17

    VHHK SIGMET 1 VALID 250925/251325 VHHH- VHHK HONG KONG FIR SEV ICE FCST N OF LINE N2100 E11730 - N1954 E11130 FL200/250 MOV E 10KT NC=

    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

    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/Mar/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     23.1 C
Minimum Air Temperature                     21.0 C
Grass Minimum Temperature                   20.9 C
Relative Humidity                        81 - 94 Percent
Rainfall                                      Trace 
Total rainfall since 1st January            53.8 mm
Against an average of                      159.6 mm

Other Stations                Min                  Max
King's Park                  20.6 C               24.1 C
Wong Chuk Hang               21.3 C               24.8 C
Ta Kwu Ling                  20.8 C               24.9 C
Lau Fau Shan                 20.9 C               27.1 C
Tai Po                       20.8 C               22.5 C
Sha Tin                      21.0 C               23.1 C
Tuen Mun                     22.0 C               25.2 C
Tseung Kwan O                20.2 C               21.8 C
Sai Kung                     20.7 C               22.0 C
Cheung Chau                  20.9 C               23.5 C
Chek Lap Kok                 21.8 C               27.2 C
Tsing Yi                     22.2 C               24.7 C
Shek Kong                    21.6 C               25.8 C
Tsuen Wan Ho Koon            21.0 C               24.0 C
Tsuen Wan Shing Mun Valley   21.6 C               24.6 C
Hong Kong Park               20.9 C               23.8 C
Shau Kei Wan                 19.7 C               21.2 C
Kowloon City                 20.9 C               24.0 C
Happy Valley                 21.1 C               25.6 C
Wong Tai Sin                 21.2 C               25.3 C
Stanley                      20.3 C               22.1 C
Kwun Tong                    20.5 C               23.0 C
Sham Shui Po                 21.8 C               25.1 C
Kai Tak Runway Park          21.0 C               22.5 C
Yuen Long Park               21.9 C               27.8 C
Tai Mei Tuk               20.3 C               22.5 C

Duration of sunshine (King's Park):              0.4 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):        19.1 C 

Yesterday's (30 Mar 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 to
0.14 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                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.14

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 30 Mar
     2003copy right image | Important notices | Privacy policy Last revision date: <31 Mar 2017> 

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