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Bulletin issued at 12:02 HKT 15/May/2017

At noon at the Hong Kong Observatory the air temperature was 25 degrees Celsius and the relative humidity 94 per cent.
During the past hour the mean UV Index recorded at King's Park was 3. The intensity of UV radiation was moderate.

The area of thundery showers associated with a trough of low pressure is affecting the vicinity of Pearl River Estuary. Heavy showers and thunderstorms may affect Hong Kong in the next couple of hours. Members of the public should be on the alert.

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 1:15 p.m. today. A few thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 25 degrees;
Wong Chuk Hang 25 degrees;
Ta Kwu Ling 25 degrees;
Lau Fau Shan 26 degrees;
Tai Po 24 degrees;
Sha Tin 25 degrees;
Tuen Mun 26 degrees;
Tseung Kwan O 25 degrees;
Sai Kung 25 degrees;
Cheung Chau 25 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 25 degrees;
Hong Kong Park 25 degrees;
Shau Kei Wan 25 degrees;
Kowloon City 25 degrees;
Happy Valley 26 degrees;
Wong Tai Sin 26 degrees;
Stanley 25 degrees;
Kwun Tong 26 degrees;
Sham Shui Po 25 degrees;
Kai Tak Runway Park 26 degrees;
Yuen Long Park 26 degrees;
Tai Mei Tuk 25 degrees.

Between 10:45 and 11:45 a.m., the rainfall recorded in various regions were:

Islands District 0 to 3 mm;
Yuen Long 0 to 2 mm.

29.0 millimetres of rainfall were recorded at the Hong Kong Observatory between midnight last night and midday today.


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


Climatological Information for 15 May

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


Local Weather Forecast
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Bulletin updated at 11:45 HKT 15/May/2017

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

The trough of low pressure over Guangdong is bringing showers and thunderstorms to the coastal areas.

Weather forecast for this afternoon and tonight

Cloudy with showers and a few squally thunderstorms. Showers will be heavy at times. Moderate southerly winds, fresh at times.

Outlook : Heavy showers at first tomorrow. Weather improving in the afternoon. Sunny periods in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 15/05/2017; 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 09:00 HKT 15/May/2017

N0 WARNING.

GENERAL SITUATION AT 142100 UTC:
TROUGH 22N 106E 25N 112E 28N 117E S 10KT.

MARINE FORECAST FOR 24 HOURS FROM 150100 UTC:

HONG KONG= S 4, BEC 5. DOWN TO 2000 M IN SCT SQUALLY HEAVY SHOWERS AND TS. SEA UP TO 2 M LATER. TEMP 27-22 C. =
KWANGTUNG= S TO SE 4-5, BEC SW 4-5. DOWN TO 2000 M IN SCT SQUALLY HEAVY SHOWERS AND TS. SEA UP TO 2 M. =
TAIWAN STRAIT= NE 4-5, UP TO 6 LATER. DOWN TO 2000 M IN SCT SQUALLY HEAVY SHOWERS AND TS. SEA 2 M, UP TO 3 M LATER. =
BASHI= SE 4-5, SW 4-5 LATER. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
PRATAS= SE 4-5, SW 4-5 LATER. ISOL SHOWERS AND SQUALLY TS. SEA UP TO 2 M. =
BALINTANG= SE 4-5, SW 4-5 LATER. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
SCARBOROUGH= E TO SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
PARACEL= S TO SE 4-5, BEC SW 4-5. ISOL SHOWERS AND SQUALLY TS IN N. SEA UP TO 2 M. =
TONKIN= S TO SE 4-5, BEC NE 4-5. DOWN TO 2000 M IN SCT SQUALLY HEAVY SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= S TO SE 4-5, BEC SW 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 12:30 HKT 15/May/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 p.m. on 15 May 2017

    Weather Situation:
    The trough of low pressure over Guangdong is bringing showers and thunderstorms to the coastal waters of Guangdong.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South force 4 to 5.
    Scattered heavy squally showers and thunderstorms.
    Moderate seas.

    Nan'ao:
    Southeast force 4 to 5, becoming southwest force 4 to 5 later.
    Scattered heavy squally showers and thunderstorms.
    Moderate seas.

    Shanwei, South of Hong Kong and Shangchuan Dao:
    South to southeast force 4 to 5, becoming southwest force 4 to 5.
    Scattered heavy squally showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    Northeasterly winds of force 5 to 6. Scattered heavy squally showers and thunderstorms.

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

    Waglan Island Wind east-northeast force 4
      Visibility 10 Kilometres

    Shantou Wind east force 2
      Visibility 18 Kilometres

    Dongsha Wind east-southeast force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind north-northwest force 2

    Macau Wind south-southeast force 1
      Visibility 3000 Metres in rain

    Xisha Wind south force 2
      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 09:00 HKT 15/MAY/2017
    (Next update at 17:30 HKT 15/MAY/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A SOUTHERLY AIRSTREAM IS BRINGING THUNDERY
     SHOWERS TO THE SOUTH CHINA COAST.  BESIDES, THE
     TROUGH OF LOW PRESSURE OVER THE NORTHERN PART OF
     SOUTHERN CHINA IS MOVING SOUTHWARDS GRADUALLY
     AND IS EXPECTED TO EDGE CLOSER TO THE COASTAL
     AREAS LATER TODAY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  160/10
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  160/15                               24-28
   B.   2000 FT:  180/15-20                            21
   C.   5000 FT:  200/20                               17
   D.  10000 FT:  230/20                               9
   E.  18000 FT:  250/30                               MS5
   F.  24000 FT:  260/35                               MS14
   G.  30000 FT:  270/40                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY TO OVERCAST WITH SHOWERS AND SQUALLY
      THUNDERSTORMS.  SHOWERS WILL BE HEAVY AT TIMES.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 FT  BKN 8000 FT.  TEMPO
      FEW CB 800 FT  SCT 1500 FT  BKN 4000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 3000 M IN SHOWERS.
                      TEMPO 1500 M IN TS.
   L. 0 DEG. C LEVEL: 15500 FT      10 DEG. C LEVEL(S) : 9600 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS.
                      MOD OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 2.0 M         SEA TEMPERATURE    : 26 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE, OCCASIONALLY FRESH SOUTH TO
     SOUTHWESTERLY WINDS.  CLOUDY TO OVERCAST WITH
     SHOWERS AND SQUALLY THUNDERSTORMS.  SHOWERS WILL
     BE HEAVY AT TIMES.=

    ===================================================================
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 11:05 HKT on 15 May 17

    VHHK SIGMET 1 VALID 150305/150705 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2118 E11130 - N2124 E11130 - N2230 E11342 - N2248 E11436 - N2306 E11630 - N2130 E11624 - N2118 E11130 TOP FL400 MOV E 05KT NC= VHHK SIGMET 3 VALID 142316/150316 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2254 E11500 - N2300 E11512 - N2218 E11536 - N2130 E11342 - N2212 E11318 - N2254 E11500 TOP FL400 MOV NE 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 15/May/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     29.5 C
Minimum Air Temperature                     24.8 C
Grass Minimum Temperature                   24.2 C
Relative Humidity                        76 - 92 Percent
Rainfall                                      Trace 
Total rainfall since 1st January           203.5 mm
Against an average of                      460.1 mm

Other Stations                Min                  Max
King's Park                  24.4 C               29.1 C
Wong Chuk Hang               23.0 C               28.4 C
Ta Kwu Ling                  21.7 C               30.9 C
Lau Fau Shan                 22.6 C               30.5 C
Tai Po                       22.6 C               28.5 C
Sha Tin                      22.8 C               29.8 C
Tuen Mun                     23.1 C               30.7 C
Tseung Kwan O                22.9 C               29.8 C
Sai Kung                     23.5 C               29.0 C
Cheung Chau                  23.6 C               28.2 C
Chek Lap Kok                 24.4 C               30.5 C
Tsing Yi                     23.1 C               30.2 C
Shek Kong                    22.0 C               30.9 C
Tsuen Wan Ho Koon            22.1 C               29.3 C
Tsuen Wan Shing Mun Valley   22.3 C               30.5 C
Hong Kong Park               23.5 C               28.3 C
Shau Kei Wan                 23.5 C               27.9 C
Kowloon City                 24.2 C               30.1 C
Happy Valley                 23.6 C               30.6 C
Wong Tai Sin                 23.6 C               29.9 C
Stanley                      23.8 C               30.0 C
Kwun Tong                    24.8 C               29.7 C
Sham Shui Po                 23.9 C               30.8 C
Kai Tak Runway Park          24.5 C               29.1 C
Yuen Long Park               22.2 C               31.3 C
Tai Mei Tuk               23.0 C               30.0 C

Duration of sunshine (King's Park):              3.1 H
The mean UV index recorded at King's Park yesterday was 3,
the UV intensity was Moderate.
The maximum UV index for yesterday was 9.
 

Yesterday's (14 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 14 May
     2003copy right image | Important notices | Privacy policy Last revision date: <15 May 2017> 

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