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Bulletin issued at 04:02 HKT 18/Apr/2017

At 4 a.m. at the Hong Kong Observatory the air temperature was 24 degrees Celsius and the relative humidity 93 per cent.

The air temperatures at other places were:

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


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


Climatological Information for 18 Apr

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


Local Weather Forecast
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Local Weather Forecast

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

Current Weather | Regional Temperature Forecast in HK |  9-day Weather Forecast
UV Index Forecast |  Weather Information for South China Coastal Waters

Bulletin updated at 03:45 HKT 18/Apr/2017

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

A southerly airstream is affecting the coast of Guangdong.

Weather forecast for today

Mainly cloudy with one or two isolated showers. Sunny periods during the day. Temperatures will range between 24 and 29 degrees. Moderate southwesterly winds.

Outlook : Sunny periods on Wednesday. More showery in the latter part of this week.


(The above forecast period is valid up to 23:59 HKT today, 18/04/2017; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

Information on Tropical Cyclones

Marine Weather Information and Forecast

Weather Information for Aviation

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MARINE FORECAST
Traditional Chinese Simplified Chinese

Marine Forecast

Weather Information for the Marine Community

Bulletin issued at 21:00 HKT 17/Apr/2017

N0 WARNING.

GENERAL SITUATION AT 170900 UTC:
A SOUTHERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 171300 UTC:

HONG KONG= SW 4, OCNL 5. ISOL SHOWERS LATER. SEA UP TO 2 M. TEMP 24-29 C. =
KWANGTUNG= S TO SW 4, OCNL 5. ISOL SHOWERS. SEA UP TO 2 M. =
TAIWAN STRAIT= SW 4-5. ISOL SHOWERS AND TS. DOWN TO 4000 M IN MORNING MIST PATCHES. SEA UP TO 2 M. =
BASHI= SW 4-5, OCNL 6. FINE. SEA UP TO 3 M. =
PRATAS= SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
BALINTANG= SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
SCARBOROUGH= S TO SE 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
PARACEL= S 4, OCNL 5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
TONKIN= SE 4, OCNL 5. ISOL SHOWERS AND TS. DOWN TO 4000 M IN MORNING MIST PATCHES. SEA UP TO 2 M. =
DANANG= SE 4, OCNL 5. ISOL SHOWERS. 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 03:30 HKT 18/Apr/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 18 April 2017

    Weather Situation:
    A southerly airstream is affecting the coastal waters of Guangdong.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Southwest force 4, occasionally force 5.
    Isolated showers.
    Moderate seas.

    Nan'ao, Shanwei and South of Hong Kong:
    Southwest force 4, occasionally force 5.
    Moderate seas.

    Shangchuan Dao:
    South to southwest force 4, occasionally force 5.
    Moderate seas.

    Outlook for the next 48 hours
    Southwesterly winds of force 4 to 5.

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

    Waglan Island Wind west force 3
      Visibility 11 Kilometres

    Shantou Wind south-southwest force 1
      Visibility 11 Kilometres

    Dongsha Wind west force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind west-southwest force 3

    Xisha Wind north force 1
      Visibility 30 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 17/APR/2017
    (Next update at 9:00-9:30 HKT 18/APR/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A SOUTHERLY AIRSTREAM IS AFFECTING THE COASTAL
     AREAS OF GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  220/5-10                             24-30
   B.   2000 FT:  260/10                               22
   C.   5000 FT:  270/15                               17
   D.  10000 FT:  270/20                               10
   E.  18000 FT:  250/35                               MS4
   F.  24000 FT:  250/40                               MS16
   G.  30000 FT:  270/50                               MS31
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      1800-2400 FT
   I. WEATHER       : 
      MAINLY CLOUDY WITH ONE OR TWO ISOLATED SHOWERS.
      SUNNY PERIODS DURING THE DAY. LOCALIZED MIST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT SCT 4000 FT
   K. VISIBILITY    : 8 KM. TEMPO 3000 M IN MIST.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 10600 FT
   M. TURBULENCE    : NIL.
   N. SEA STATE     : 0.5-1.0 M     SEA TEMPERATURE    : 22 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTHWESTERLY WINDS. SUNNY PERIODS AND
     ONE OR TWO ISOLATED SHOWERS.=

    ===================================================================
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 19:13 HKT on 13 Apr 17

    VHHK SIGMET 2 VALID 130715/131115 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1842 E11212 - N1930 E11130 - N2100 E11130 - N2124 E11348 - N1936 E11436 - N1842 E11212 TOP FL380 MOV E 10KT NC= VHHK SIGMET 3 VALID 131115/131515 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1730 E11318 - N2000 E11230 - N2030 E11518 - N1900 E11512 - N1748 E11400 - N1730 E11318 TOP FL380 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

    Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
    Current Weather |  Local Weather Forecast |  9-day Weather Forecast
    South China Coastal Waters |  Marine Forecast
    Severe Weather Information Centre

    Bulletin issued at 12:30 HKT 17/Apr/2017


    Tropical Cyclone Warning

    The tropical depression in the vicinity of the Philippines has weakened into an area of low pressure with central pressure 1004 hectopascals. At 170300 UTC, it was centred within 90 nautical miles of one three point six degrees north (13.6 N) one one seven point six degrees east (117.6 E).

    Maximum winds near the centre are estimated to be 20 knots.

    No further warnings on this area of low pressure will be issued by the Hong Kong Observatory unless re-intensification 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 18/Apr/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     29.4 C
Minimum Air Temperature                     23.7 C
Grass Minimum Temperature                   23.1 C
Relative Humidity                        63 - 92 Percent
Rainfall                                      Trace 
Total rainfall since 1st January            98.3 mm
Against an average of                      257.9 mm

Other Stations                Min                  Max
King's Park                  23.2 C               29.2 C
Wong Chuk Hang               22.2 C               27.6 C
Ta Kwu Ling                  23.0 C               31.8 C
Lau Fau Shan                 22.7 C               30.2 C
Tai Po                       23.0 C               32.2 C
Sha Tin                      22.3 C               31.9 C
Tuen Mun                     23.3 C               30.3 C
Tseung Kwan O                22.8 C               31.3 C
Sai Kung                     22.9 C               28.3 C
Cheung Chau                  22.5 C               29.6 C
Chek Lap Kok                 23.9 C               30.4 C
Tsing Yi                     22.7 C               29.3 C
Shek Kong                    21.5 C               32.0 C
Tsuen Wan Ho Koon            21.7 C               29.9 C
Tsuen Wan Shing Mun Valley   22.0 C               30.0 C
Hong Kong Park               22.7 C               31.4 C
Shau Kei Wan                 22.4 C               30.9 C
Kowloon City                 23.3 C               30.9 C
Happy Valley                 23.8 C               32.4 C
Wong Tai Sin                 23.3 C               31.0 C
Stanley                      23.1 C               27.1 C
Kwun Tong                    23.4 C               31.6 C
Sham Shui Po                 23.4 C               29.5 C
Kai Tak Runway Park          23.3 C               30.8 C
Yuen Long Park               23.1 C               31.5 C
Tai Mei Tuk               23.1 C               31.8 C

Duration of sunshine (King's Park):              8.8 H
The mean UV index recorded at King's Park yesterday was 5,
the UV intensity was Moderate.
The maximum UV index for yesterday was 11.
Sea surface temperature (Waglan Island):        22.7 C 

Yesterday's (17 Apr 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                               0.09
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 17 Apr
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