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Bulletin issued at 03:02 HKT 22/May/2017

At 3 a.m. at the Hong Kong Observatory the air temperature was 24 degrees Celsius and the relative humidity 92 per cent.

The air temperatures at other places were:

King's Park 24 degrees;
Wong Chuk Hang 25 degrees;
Ta Kwu Ling 24 degrees;
Lau Fau Shan 24 degrees;
Tai Po 24 degrees;
Sha Tin 25 degrees;
Tuen Mun 25 degrees;
Tseung Kwan O 23 degrees;
Sai Kung 24 degrees;
Cheung Chau 25 degrees;
Chek Lap Kok 25 degrees;
Tsing Yi 25 degrees;
Shek Kong 25 degrees;
Tsuen Wan Ho Koon 24 degrees;
Tsuen Wan Shing Mun Valley 25 degrees;
Hong Kong Park 24 degrees;
Shau Kei Wan 24 degrees;
Kowloon City 24 degrees;
Happy Valley 25 degrees;
Wong Tai Sin 25 degrees;
Stanley 24 degrees;
Kwun Tong 24 degrees;
Sham Shui Po 25 degrees;
Kai Tak Runway Park 25 degrees;
Yuen Long Park 25 degrees;
Tai Mei Tuk 24 degrees.


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


Climatological Information for 22 May

Regional Weather in Hong Kong

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Bulletin updated at 02:45 HKT 22/May/2017

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

Showers associated with a trough of low pressure are affecting the northern part of the South China Sea and the coast of Guangdong.

Weather forecast for today

Cloudy with a few showers. Temperatures will range between 23 and 26 degrees. Moderate to fresh easterly winds, occasionally strong offshore and on high ground at first.

Outlook : Sunny intervals on Tuesday. There will still be a few showers midweek this week.


(The above forecast period is valid up to 23:59 HKT today, 22/05/2017; 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 21:00 HKT 21/May/2017

N0 WARNING.

GENERAL SITUATION AT 210900 UTC:
TROUGH 20N 110E 19N 120E 20N 125E QSTNR.

MARINE FORECAST FOR 24 HOURS FROM 211300 UTC:

HONG KONG= E 5-6, OCNL 7. ISOL SHOWERS AND TS. SEA 3 M. TEMP 23-26 C. =
KWANGTUNG= E TO SE 5-6, OCNL 7 IN E. ISOL SHOWERS AND TS. SEA 3 M. SWELL E UP TO 2 M. =
TAIWAN STRAIT= NE 5-6. ISOL SHOWERS. SEA 2-3 M. SWELL NE UP TO 2 M. =
BASHI= E TO NE 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E TO NE 2 M. =
PRATAS= E 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E TO NE 2 M. =
BALINTANG= E TO NE 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E TO NE 2 M. =
SCARBOROUGH= SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL NE UP TO 2 M. =
PARACEL= S TO SE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL NE UP TO 2 M. =
TONKIN= SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= SE 4-5. ISOL SHOWERS AND 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 03:30 HKT 22/May/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 22 May 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    A trough of low pressure is affecting the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 5 to 6, occasionally force 7.
    Isolated showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao and Shanwei:
    East force 5 to 6, occasionally force 7.
    Moderate to rough seas.

    South of Hong Kong:
    East to southeast force 5 to 6, occasionally force 7.
    Isolated showers and thunderstorms.
    Moderate to rough seas.

    Shangchuan Dao:
    Southeast force 5 to 6.
    Isolated showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    South to southwesterly winds of force 4 to 5. Isolated showers and thunderstorms.

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

    Waglan Island Wind east-northeast force 5
      Visibility 8 Kilometres

    Shantou Wind east force 2
      Visibility 30 Kilometres

    Dongsha Wind east force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 5

    Macau Wind east force 3
      Visibility 11 Kilometres

    Xisha Wind south-southeast force 1
      Visibility 29 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 01:30 HKT 22/MAY/2017
    (Next update at 9:00-9:30 HKT 22/MAY/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN EASTERLY AIRSTREAM PERSISTS OVER 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:  090/10-15
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  090/20-25                            23-27
   B.   2000 FT:  110/20-25                            20
   C.   5000 FT:  160/15                               18
   D.  10000 FT:  240/15                               11
   E.  18000 FT:  260/15                               MS3
   F.  24000 FT:  280/20                               MS12
   G.  30000 FT:  320/30                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH A FEW SHOWERS AND ISOLATED
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 FT  BKN 10000 FT.  TEMPO
      FEW CB 1000 FT  SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 3000 M IN SHOWERS.  TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 11000 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS, OFFSHORE AND  NEAR HILLS
   N. SEA STATE     : 3.0-3.5 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EASTERLY WINDS, OCCASIONALLY
     STRONG OFFSHORE.  CLOUDY WITH A FEW SHOWERS AND
     ISOLATED THUNDERSTORMS.=

    ===================================================================
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 01:00 HKT on 22 May 17

    VHHK SIGMET 4 VALID 211300/211700 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2118 E11200 - N2148 E11348 - N2036 E11336 - N2030 E11142 - N2118 E11200 TOP FL380 MOV E 05KT WKN= VHHK SIGMET 5 VALID 211700/212100 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2112 E11206 - N2124 E11342 - N2030 E11336 - N2024 E11154 - N2112 E11206 TOP FL380 MOV E 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

    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 22/May/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     24.9 C
Minimum Air Temperature                     23.0 C
Grass Minimum Temperature                   24.0 C
Relative Humidity                        86 - 94 Percent
Rainfall                                     4.4 mm 
Total rainfall since 1st January           250.5 mm
Against an average of                      533.2 mm

Other Stations                Min                  Max
King's Park                  22.5 C               25.4 C
Wong Chuk Hang               22.7 C               25.9 C
Ta Kwu Ling                  22.5 C               26.5 C
Lau Fau Shan                 23.1 C               28.6 C
Tai Po                       22.5 C               24.9 C
Sha Tin                      22.7 C               25.5 C
Tuen Mun                     24.0 C               27.2 C
Tseung Kwan O                22.1 C               24.1 C
Sai Kung                     22.5 C               25.1 C
Cheung Chau                  23.2 C               24.3 C
Chek Lap Kok                 24.2 C               27.3 C
Tsing Yi                     23.7 C               26.3 C
Shek Kong                    23.7 C               27.7 C
Tsuen Wan Ho Koon            22.6 C               25.9 C
Tsuen Wan Shing Mun Valley   23.2 C               26.2 C
Hong Kong Park               22.3 C               25.4 C
Shau Kei Wan                 22.3 C               24.3 C
Kowloon City                 22.4 C               25.4 C
Happy Valley                 23.0 C               25.9 C
Wong Tai Sin                 22.6 C               25.8 C
Stanley                      23.0 C               24.8 C
Kwun Tong                    22.6 C               24.9 C
Sham Shui Po                 23.4 C               27.1 C
Kai Tak Runway Park          23.0 C               25.3 C
Yuen Long Park               23.8 C               27.0 C
Tai Mei Tuk               22.5 C               24.8 C

Duration of sunshine (King's Park):              0.1 H
The mean UV index recorded at King's Park yesterday was 1,
the UV intensity was Low.
The maximum UV index for yesterday was 6.
Sea surface temperature (Waglan Island):        25.2 C 

Yesterday's (21 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                             0.09
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 21 May
     2003copy right image | Important notices | Privacy policy Last revision date: <22 May 2017> 

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