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Bulletin issued at 05:21 HKT 24/May/2017

At 5 a.m. at the Hong Kong Observatory the air temperature was 26 degrees Celsius and the relative humidity 97 per cent.

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 6:45 a.m. today. Isolated thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 26 degrees;
Wong Chuk Hang 26 degrees;
Ta Kwu Ling 26 degrees;
Lau Fau Shan 26 degrees;
Tai Po 25 degrees;
Sha Tin 26 degrees;
Tuen Mun 26 degrees;
Tseung Kwan O 25 degrees;
Sai Kung 25 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 27 degrees;
Tsing Yi 26 degrees;
Shek Kong 26 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 26 degrees;
Hong Kong Park 26 degrees;
Shau Kei Wan 25 degrees;
Kowloon City 26 degrees;
Happy Valley 27 degrees;
Wong Tai Sin 26 degrees;
Stanley 26 degrees;
Kwun Tong 26 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 26 degrees;
Yuen Long Park 26 degrees;
Tai Mei Tuk 25 degrees.

Between 3:45 and 4:45 a.m., lightning was detected within New Territories East. The rainfall recorded in various regions were:

Sai Kung 0 to 23 mm;
Yuen Long 0 to 4 mm;
Islands District 0 to 4 mm;
Southern District 0 to 3 mm;
Tai Po 0 to 3 mm;
Tuen Mun 0 to 3 mm;
North District 0 to 2 mm;
Central & Western District 0 to 2 mm;
Tsuen Wan 0 to 2 mm;
Kwai Tsing 0 to 1 mm;
Sha Tin 0 to 1 mm;
Sham Shui Po 0 to 1 mm.


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


Climatological Information for 24 May

Regional Weather in Hong Kong

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Bulletin updated at 05:15 HKT 24/May/2017

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

Showers and thunderstorms associated with a trough of low pressure is affecting the coastal areas of Guangdong gradually.

Weather forecast for today

Mainly cloudy with showers and a few thunderstorms. Visibility rather low at first. The maximum temperature will be about 28 degrees. Light winds, becoming moderate northerly winds.

Outlook : Becoming fine gradually in the next few days.


(The above forecast period is valid up to 23:59 HKT today, 24/05/2017; 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 23/May/2017

N0 WARNING.

GENERAL SITUATION AT 230900 UTC:
TROUGH 23N 105E 25N 110E 30N 125E S 10KT.

MARINE FORECAST FOR 24 HOURS FROM 231300 UTC:

HONG KONG= S TO SW 3-4, N 5 LATER. DOWN TO 4000 M IN MIST PATCHES AT FIRST. ISOL SHOWERS AND TS LATER. SEA UP TO 2 M. TEMP 25-28 C. =
KWANGTUNG= S TO SW 4, N 5 LATER. ISOL SHOWERS AND TS LATER. SEA UP TO 2 M. =
TAIWAN STRAIT= SW 4-5. ISOL SHOWERS AND TS LATER. SEA UP TO 2 M. =
BASHI= W TO SW 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
PRATAS= S TO SW 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
BALINTANG= W TO SW 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
SCARBOROUGH= S TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
PARACEL= S TO SW 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
TONKIN= S TO SE 4-5, NE 5 LATER. ISOL SHOWERS. SEA UP TO 2 M. =
DANANG= S TO SE 4-5. 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

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    9-day Weather Forecast | UV Index Forecast | Weather Information for Fishermen

    Bulletin issued at 05:30 HKT 24/May/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 24 May 2017

    Warnings:
    Fog in Hong Kong adjacent waters.

    Weather Situation:
    Showers and thunderstorms associated with a trough of low pressure are affecting the coastal waters of Guangdong gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South to southwest force 3 to 4, becoming north force 5.
    Showers and isolated thunderstorms. Visibility rather low in some areas at first.
    Slight to moderate seas.

    Nan'ao and Shanwei:
    South to southwest force 4, becoming north force 5.
    Isolated showers and thunderstorms later.
    Moderate seas.

    South of Hong Kong and Shangchuan Dao:
    South to southwest force 4, becoming north force 5.
    Isolated showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    East to northeasterly winds of force 5 to 6. Isolated showers and thunderstorms.

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

    Waglan Island Wind southeast force 1
      Visibility 2100 Metres

    Shantou Wind south-southeast force 1
      Visibility 14 Kilometres

    Dongsha Wind east force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind south-southeast force 4

    Macau Wind south force 1
      Visibility 200 Metres in fog

    Xisha Wind south-southwest force 2
      Visibility 19 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 24/MAY/2017
    (Next update at 9:00-9:30 HKT 24/MAY/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE TROUGH OF LOW PRESSURE OVER INLAND GUANGDONG
     WILL EDGE CLOSER TO THE SOUTH CHINA COASTAL
     WATERS TODAY, BRINGING SHOWERS AND THUNDERSTORMS
     TO THE REGION.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  120/5-10
                  TEMPO VRB/15G25 IN TS                26-29
   B.   2000 FT:  200/10-15                            23
   C.   5000 FT:  240/10                               19
   D.  10000 FT:  250/10                               12
   E.  18000 FT:  280/15                               MS3
   F.  24000 FT:  290/20                               MS13
   G.  30000 FT:  290/20                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS AND MIST. A
      FEW ISOLATED THUNDERSTORMS LATER.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 700 FT  SCT 2000 FT TEMPO FEW CB 700 FT SCT
      1500 FT
   K. VISIBILITY    : 8 KM. TEMPO 4000 M IN SHOWERS. TEMPO 2000 M IN MIST/TS.
   L. 0 DEG. C LEVEL: 19000 FT      10 DEG. C LEVEL(S) : 12000 FT
   M. TURBULENCE    : OCNL MOD TO SEV NEAR CUNIM/TS
   N. SEA STATE     : 0.5-1.5 M     SEA TEMPERATURE    : 26 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTHERLY WINDS. MAINLY CLOUDY WITH
     ISOLATED SHOWERS AND A FEW 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 09:00 HKT on 23 May 17

    VHHK SIGMET 1 VALID 230100/230500 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2024 E11700 - N1924 E11612 - N2006 E11500 - N2130 E11536 - N2130 E11712 - N2042 E11712 - N2024 E11700 TOP FL400 MOV NE 05KT NC= VHHK SIGMET 6 VALID 222100/230100 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1942 E11630 - N1830 E11530 - N1930 E11430 - N2030 E11430 - N2130 E11530 - N2130 E11645 - N1942 E11630 TOP FL400 MOV NE 05KT 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 24/May/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.5 C
Minimum Air Temperature                     24.6 C
Grass Minimum Temperature                   24.8 C
Relative Humidity                        85 - 99 Percent
Rainfall                                     4.1 mm 
Total rainfall since 1st January           260.2 mm
Against an average of                      547.1 mm

Other Stations                Min                  Max
King's Park                  24.4 C               29.6 C
Wong Chuk Hang               24.5 C               28.9 C
Ta Kwu Ling                  24.1 C               30.7 C
Lau Fau Shan                 23.9 C               30.9 C
Tai Po                       23.9 C               27.6 C
Sha Tin                      24.5 C               29.9 C
Tuen Mun                     24.7 C               30.9 C
Tseung Kwan O                24.3 C               27.7 C
Sai Kung                     24.6 C               28.0 C
Cheung Chau                  24.6 C               28.7 C
Chek Lap Kok                 24.9 C               32.0 C
Tsing Yi                     24.7 C               30.6 C
Shek Kong                    24.6 C               32.6 C
Tsuen Wan Ho Koon            23.9 C               30.1 C
Tsuen Wan Shing Mun Valley   24.5 C               30.4 C
Hong Kong Park               24.3 C               27.9 C
Shau Kei Wan                 24.3 C               27.2 C
Kowloon City                 24.2 C               29.5 C
Happy Valley                 25.0 C               30.2 C
Wong Tai Sin                 24.4 C               29.5 C
Stanley                      24.9 C               28.8 C
Kwun Tong                    24.7 C               29.6 C
Sham Shui Po                 24.7 C               31.0 C
Kai Tak Runway Park          25.2 C               28.1 C
Yuen Long Park               24.4 C               30.7 C
Tai Mei Tuk               23.9 C               28.7 C

Duration of sunshine (King's Park):              4.8 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 9.
Sea surface temperature (Waglan Island):        25.4 C 

Yesterday's (23 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                         0.11
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 23 May
     2003copy right image | Important notices | Privacy policy Last revision date: <24 May 2017> 

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