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Bulletin issued at 00:30 HKT 09/May/2017

At midnight at the Hong Kong Observatory the air temperature was 23 degrees Celsius and the relative humidity 86 per cent.

The air temperatures at other places were:

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

Between 10:45 and 11:45 p.m., lightning was detected within New Territories East. The rainfall recorded in various regions were:

Sai Kung 7 to 18 mm;
Southern District 3 to 16 mm;
Wong Tai Sin 9 to 16 mm;
Eastern District 8 to 15 mm;
Yau Tsim Mong 10 to 14 mm;
Wan Chai 9 to 14 mm;
Kowloon City 9 to 14 mm;
Kwun Tong 9 to 12 mm;
Sha Tin 4 to 12 mm;
Islands District 2 to 11 mm;
Central & Western District 5 to 11 mm;
Tsuen Wan 0 to 10 mm;
Kwai Tsing 7 to 9 mm;
Tuen Mun 3 to 8 mm;
Sham Shui Po 6 to 8 mm;
Tai Po 2 to 8 mm;
Yuen Long 1 to 7 mm;
North District 2 to 5 mm.


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


Climatological Information for 9 May

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


Local Weather Forecast
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Bulletin updated at 00:00 HKT 09/May/2017

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

An easterly airstream continued to affect the coast of Guangdong yesterday. Meanwhile, a band of thundery showers associated with a trough of low pressure affected Guangdong. Locally, it was mainly cloudy with one or two showers. There were sunny intervals during the day and showers were more frequent at night. The trough of low pressure will continue to bring showers to southern China today. With the ridge of high pressure over the western North Pacific extending westwards, it will be mainly fine and hot over southeastern China in the middle and latter parts of this week.

Weather forecast for Hong Kong (Tuesday, 9 May 2017)

Mainly cloudy with a few showers. Showers will be more frequent with a few squally thunderstorms at first. Sunny intervals during the day. Temperatures will range between 23 and 30 degrees. Light winds.

Outlook : Hot with sunny periods in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 09/05/2017; 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 08/May/2017

N0 WARNING.

GENERAL SITUATION AT 080900 UTC:
TROUGH 21N 106E 23N 110E 24N 115E 27N 118E S 10KT.

MARINE FORECAST FOR 24 HOURS FROM 081300 UTC:

HONG KONG= SE 3-4. ISOL SHOWERS AND SQUALLY TS. TEMP 25-30 C. =
KWANGTUNG= SE 3-4. ISOL SHOWERS AND SQUALLY TS. =
TAIWAN STRAIT= S TO SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
BASHI= S TO SE 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
PRATAS= SE 4. ISOL SHOWERS AND SQUALLY TS. =
BALINTANG= S TO SE 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
SCARBOROUGH= SE 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
PARACEL= SE 4. ISOL SHOWERS AND SQUALLY TS. =
TONKIN= S TO SE 4-5. ISOL SHOWERS AND SQUALLY TS. SEA UP TO 2 M. =
DANANG= S TO SE 4-5. ISOL SHOWERS AND SQUALLY TS. 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 23:30 HKT 08/May/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 08 May 2017

    Weather Situation:
    A southeasterly airstream is affecting the coastal waters of Guangdong. Meanwhile, a band of thundery showers associated with a trough of low pressure is affecting the region.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Southeast force 3 to 4.
    Showers and squally thunderstorms.
    Slight to moderate seas.

    Nan'ao, Shanwei and South of Hong Kong:
    Southeast force 3 to 4.
    Isolated showers and squally thunderstorms.
    Slight to moderate seas.

    Shangchuan Dao:
    South to southeast force 3 to 4.
    Isolated showers and squally thunderstorms.
    Slight to moderate seas.

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

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

    Waglan Island Wind north-northwest force 1
      Visibility 3300 Metres

    Shantou Wind south force 2
      Visibility 10 Kilometres

    Dongsha Wind southeast force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind south-southeast force 3

    Macau Wind west force 1
      Visibility 8 Kilometres

    Xisha Wind southeast force 2
      Visibility 24 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 17:30 HKT 08/MAY/2017
    (Next update at 01:30 HKT 09/MAY/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A SOUTHEASTERLY AIRSTREAM IS AFFECTING THE
     COASTAL AREAS OF GUANGDONG.  MEANWHILE, SHOWERS
     AND THUNDERSTORMS ASSOCIATED WITH A TROUGH OF
     LOW PRESSURE ARE AFFECTING THE NORTHERN PART OF
     GUANGDONG AND MOVING SOUTHWARDS GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  130/5-10
                  TEMPO VRB/20G30 IN TS                27-24
   B.   2000 FT:  160/15-20 BEC 220/15                 21
   C.   5000 FT:  250/20                               18
   D.  10000 FT:  250/25                               10
   E.  18000 FT:  250/35                               MS5
   F.  24000 FT:  250/35                               MS15
   G.  30000 FT:  250/40                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS AND ISOLATED
      SQUALLY THUNDERSTORMS.  LOCALIZED MIST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 FT.  TEMPO FEW CB 1000 FT
      SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 3000 M IN SHOWERS/MIST.
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 15500 FT      10 DEG. C LEVEL(S) : 10000 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS.  MOD NEAR HILLS.
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT WINDS.  SUNNY INTERVALS WITH A FEW
     SHOWERS.  ISOLATED THUNDERSTORMS IN THE MORNING.
     LOCALIZED MIST.=

    ===================================================================
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 21:30 HKT on 08 May 17

    VHHK SIGMET 1 VALID 081345/081745 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF LINE N2230 E11730 - N2030 E11130 TOP FL400 MOV ESE 10KT 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

    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 09/May/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.6 C
Minimum Air Temperature                     23.1 C
Grass Minimum Temperature                   22.1 C
Relative Humidity                        76 - 89 Percent
Rainfall                                     9.2 mm 
Total rainfall since 1st January           188.0 mm
Against an average of                      417.2 mm

Other Stations                Min                  Max
King's Park                  22.3 C               28.6 C
Wong Chuk Hang               21.9 C               27.7 C
Ta Kwu Ling                  21.7 C               29.3 C
Lau Fau Shan                 21.1 C               29.5 C
Tai Po                       21.7 C               27.1 C
Sha Tin                      22.6 C               27.9 C
Tuen Mun                     21.8 C               29.9 C
Tseung Kwan O                22.1 C               26.5 C
Sai Kung                     22.2 C               27.0 C
Cheung Chau                  22.0 C               28.1 C
Chek Lap Kok                 22.2 C               30.1 C
Tsing Yi                     22.2 C               29.8 C
Shek Kong                    22.0 C               30.2 C
Tsuen Wan Ho Koon            21.0 C               26.6 C
Tsuen Wan Shing Mun Valley   21.9 C               28.2 C
Hong Kong Park               21.8 C               28.6 C
Shau Kei Wan                 21.6 C               26.5 C
Kowloon City                 21.7 C               28.1 C
Happy Valley                 22.3 C               29.9 C
Wong Tai Sin                 21.8 C               28.2 C
Stanley                      21.9 C               26.8 C
Kwun Tong                    22.2 C               27.4 C
Sham Shui Po                 22.3 C               28.9 C
Kai Tak Runway Park          21.9 C               27.1 C
Yuen Long Park               21.9 C               30.2 C
Tai Mei Tuk               21.7 C               28.4 C

Duration of sunshine (King's Park):              5.3 H
The mean UV index recorded at King's Park yesterday was 4,
the UV intensity was Moderate.
The maximum UV index for yesterday was 10.
 

Yesterday's (08 May 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                             0.08
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 08 May
     2003copy right image | Important notices | Privacy policy Last revision date: <09 May 2017> 

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